Commit

src/core/api_client.py

@@ -120,7 +120,7 @@ def download_from_api(
     selected_cookie_file=None,
     app_base_dir=None,
     manga_filename_style_for_sort_check=None,
-    processed_post_ids=None  # --- ADD THIS ARGUMENT ---
+    processed_post_ids=None
 ):
     headers = {
         'User-Agent': 'Mozilla/5.0',
@@ -139,9 +139,14 @@ def download_from_api(
 
     parsed_input_url_for_domain = urlparse(api_url_input)
     api_domain = parsed_input_url_for_domain.netloc
-    if not any(d in api_domain.lower() for d in ['kemono.su', 'kemono.party', 'coomer.su', 'coomer.party']):
+    
+    # --- START: MODIFIED LOGIC ---
+    # This list is updated to include the new .cr and .st mirrors for validation.
+    if not any(d in api_domain.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
         logger(f"⚠️ Unrecognized domain '{api_domain}' from input URL. Defaulting to kemono.su for API calls.")
         api_domain = "kemono.su"
+    # --- END: MODIFIED LOGIC ---
+        
     cookies_for_api = None
     if use_cookie and app_base_dir:
         cookies_for_api = prepare_cookies_for_request(use_cookie, cookie_text, selected_cookie_file, app_base_dir, logger, target_domain=api_domain)
@@ -220,6 +225,9 @@ def download_from_api(
                         logger(f"   Manga Mode: No posts found within the specified page range ({start_page or 1}-{end_page}).")
                     break
                 all_posts_for_manga_mode.extend(posts_batch_manga)
+                
+                logger(f"MANGA_FETCH_PROGRESS:{len(all_posts_for_manga_mode)}:{current_page_num_manga}")
+
                 current_offset_manga += page_size
                 time.sleep(0.6)
             except RuntimeError as e:
@@ -232,7 +240,12 @@ def download_from_api(
                 logger(f"❌ Unexpected error during manga mode fetch: {e}")
                 traceback.print_exc()
                 break
+        
         if cancellation_event and cancellation_event.is_set(): return
+        
+        if all_posts_for_manga_mode:
+            logger(f"MANGA_FETCH_COMPLETE:{len(all_posts_for_manga_mode)}")
+
         if all_posts_for_manga_mode:
             if processed_post_ids:
                 original_count = len(all_posts_for_manga_mode)

src/core/manager.py

@@ -5,11 +5,10 @@ import json
 import traceback
 from concurrent.futures import ThreadPoolExecutor, as_completed, Future
 from .api_client import download_from_api
-from .workers import PostProcessorWorker, DownloadThread
+from .workers import PostProcessorWorker
 from ..config.constants import (
     STYLE_DATE_BASED, STYLE_POST_TITLE_GLOBAL_NUMBERING,
-    MAX_THREADS, POST_WORKER_BATCH_THRESHOLD, POST_WORKER_NUM_BATCHES,
-    POST_WORKER_BATCH_DELAY_SECONDS
+    MAX_THREADS
 )
 from ..utils.file_utils import clean_folder_name
 
@@ -44,6 +43,7 @@ class DownloadManager:
         self.creator_profiles_dir = None
         self.current_creator_name_for_profile = None
         self.current_creator_profile_path = None
+        self.session_file_path = None
 
     def _log(self, message):
         """Puts a progress message into the queue for the UI."""
@@ -61,12 +61,16 @@ class DownloadManager:
         if self.is_running:
             self._log("❌ Cannot start a new session: A session is already in progress.")
             return
-        
+
+        self.session_file_path = config.get('session_file_path')
         creator_profile_data = self._setup_creator_profile(config)
-        creator_profile_data['settings'] = config
-        creator_profile_data.setdefault('processed_post_ids', [])
-        self._save_creator_profile(creator_profile_data)
-        self._log(f"✅ Loaded/created profile for '{self.current_creator_name_for_profile}'. Settings saved.")
+        
+        # Save settings to profile at the start of the session
+        if self.current_creator_profile_path:
+            creator_profile_data['settings'] = config
+            creator_profile_data.setdefault('processed_post_ids', [])
+            self._save_creator_profile(creator_profile_data)
+            self._log(f"✅ Loaded/created profile for '{self.current_creator_name_for_profile}'. Settings saved.")
 
         self.is_running = True
         self.cancellation_event.clear()
@@ -77,6 +81,7 @@ class DownloadManager:
         self.total_downloads = 0
         self.total_skips = 0
         self.all_kept_original_filenames = []
+        
         is_single_post = bool(config.get('target_post_id_from_initial_url'))
         use_multithreading = config.get('use_multithreading', True)
         is_manga_sequential = config.get('manga_mode_active') and config.get('manga_filename_style') in [STYLE_DATE_BASED, STYLE_POST_TITLE_GLOBAL_NUMBERING]
@@ -86,72 +91,99 @@ class DownloadManager:
         if should_use_multithreading_for_posts:
             fetcher_thread = threading.Thread(
                 target=self._fetch_and_queue_posts_for_pool,
-                args=(config, restore_data, creator_profile_data), # Add argument here
+                args=(config, restore_data, creator_profile_data),
                 daemon=True
             )
             fetcher_thread.start()
         else:
-            self._start_single_threaded_session(config)
+            # Single-threaded mode does not use the manager's complex logic
+            self._log("ℹ️ Manager is handing off to a single-threaded worker...")
+            # The single-threaded worker will manage its own lifecycle and signals.
+            # The manager's role for this session is effectively over.
+            self.is_running = False # Allow another session to start if needed
+            self.progress_queue.put({'type': 'handoff_to_single_thread', 'payload': (config,)})
 
-    def _start_single_threaded_session(self, config):
-        """Handles downloads that are best processed by a single worker thread."""
-        self._log("ℹ️ Initializing single-threaded download process...")
-        self.worker_thread = threading.Thread(
-            target=self._run_single_worker,
-            args=(config,),
-            daemon=True
-        )
-        self.worker_thread.start()
 
-    def _run_single_worker(self, config):
-        """Target function for the single-worker thread."""
-        try:
-            worker = DownloadThread(config, self.progress_queue)
-            worker.run() # This is the main blocking call for this thread
-        except Exception as e:
-            self._log(f"❌ CRITICAL ERROR in single-worker thread: {e}")
-            self._log(traceback.format_exc())
-        finally:
-            self.is_running = False
-
-    def _fetch_and_queue_posts_for_pool(self, config, restore_data):
+    def _fetch_and_queue_posts_for_pool(self, config, restore_data, creator_profile_data):
         """
-        Fetches all posts from the API and submits them as tasks to a thread pool.
-        This method runs in its own dedicated thread to avoid blocking.
+        Fetches posts from the API in batches and submits them as tasks to a thread pool.
+        This method runs in its own dedicated thread to avoid blocking the UI.
+        It provides immediate feedback as soon as the first batch of posts is found.
         """
         try:
             num_workers = min(config.get('num_threads', 4), MAX_THREADS)
             self.thread_pool = ThreadPoolExecutor(max_workers=num_workers, thread_name_prefix='PostWorker_')
 
-            session_processed_ids = set(restore_data['processed_post_ids']) if restore_data else set()
+            session_processed_ids = set(restore_data.get('processed_post_ids', [])) if restore_data else set()
             profile_processed_ids = set(creator_profile_data.get('processed_post_ids', []))
             processed_ids = session_processed_ids.union(profile_processed_ids)
 
-            if restore_data:
+            if restore_data and 'all_posts_data' in restore_data:
+                # This logic for session restore remains as it relies on a pre-fetched list
                 all_posts = restore_data['all_posts_data']
-                processed_ids = set(restore_data['processed_post_ids'])
                 posts_to_process = [p for p in all_posts if p.get('id') not in processed_ids]
                 self.total_posts = len(all_posts)
                 self.processed_posts = len(processed_ids)
                 self._log(f"🔄 Restoring session. {len(posts_to_process)} posts remaining.")
+                self.progress_queue.put({'type': 'overall_progress', 'payload': (self.total_posts, self.processed_posts)})
+                
+                if not posts_to_process:
+                    self._log("✅ No new posts to process from restored session.")
+                    return
+
+                for post_data in posts_to_process:
+                    if self.cancellation_event.is_set(): break
+                    worker = PostProcessorWorker(post_data, config, self.progress_queue)
+                    future = self.thread_pool.submit(worker.process)
+                    future.add_done_callback(self._handle_future_result)
+                    self.active_futures.append(future)
             else:
-                posts_to_process = self._get_all_posts(config)
-                self.total_posts = len(posts_to_process)
+                # --- START: REFACTORED STREAMING LOGIC ---
+                post_generator = download_from_api(
+                    api_url_input=config['api_url'],
+                    logger=self._log,
+                    start_page=config.get('start_page'),
+                    end_page=config.get('end_page'),
+                    manga_mode=config.get('manga_mode_active', False),
+                    cancellation_event=self.cancellation_event,
+                    pause_event=self.pause_event,
+                    use_cookie=config.get('use_cookie', False),
+                    cookie_text=config.get('cookie_text', ''),
+                    selected_cookie_file=config.get('selected_cookie_file'),
+                    app_base_dir=config.get('app_base_dir'),
+                    manga_filename_style_for_sort_check=config.get('manga_filename_style'),
+                    processed_post_ids=list(processed_ids)
+                )
+
+                self.total_posts = 0
                 self.processed_posts = 0
 
-            self.progress_queue.put({'type': 'overall_progress', 'payload': (self.total_posts, self.processed_posts)})
-            
-            if not posts_to_process:
-                self._log("✅ No new posts to process.")
-                return
-            for post_data in posts_to_process:
-                if self.cancellation_event.is_set():
-                    break
-                worker = PostProcessorWorker(post_data, config, self.progress_queue)
-                future = self.thread_pool.submit(worker.process)
-                future.add_done_callback(self._handle_future_result)
-                self.active_futures.append(future)
-        
+                # Process posts in batches as they are yielded by the API client
+                for batch in post_generator:
+                    if self.cancellation_event.is_set():
+                        self._log("   Post fetching cancelled.")
+                        break
+                    
+                    # Filter out any posts that might have been processed since the start
+                    posts_in_batch_to_process = [p for p in batch if p.get('id') not in processed_ids]
+                    
+                    if not posts_in_batch_to_process:
+                        continue
+
+                    # Update total count and immediately inform the UI
+                    self.total_posts += len(posts_in_batch_to_process)
+                    self.progress_queue.put({'type': 'overall_progress', 'payload': (self.total_posts, self.processed_posts)})
+
+                    for post_data in posts_in_batch_to_process:
+                        if self.cancellation_event.is_set(): break
+                        worker = PostProcessorWorker(post_data, config, self.progress_queue)
+                        future = self.thread_pool.submit(worker.process)
+                        future.add_done_callback(self._handle_future_result)
+                        self.active_futures.append(future)
+
+                if self.total_posts == 0 and not self.cancellation_event.is_set():
+                     self._log("✅ No new posts found to process.")
+
         except Exception as e:
             self._log(f"❌ CRITICAL ERROR in post fetcher thread: {e}")
             self._log(traceback.format_exc())
@@ -164,28 +196,6 @@ class DownloadManager:
                 'type': 'finished',
                 'payload': (self.total_downloads, self.total_skips, self.cancellation_event.is_set(), self.all_kept_original_filenames)
             })
-    
-    def _get_all_posts(self, config):
-        """Helper to fetch all posts using the API client."""
-        all_posts = []
-        post_generator = download_from_api(
-            api_url_input=config['api_url'],
-            logger=self._log,
-            start_page=config.get('start_page'),
-            end_page=config.get('end_page'),
-            manga_mode=config.get('manga_mode_active', False),
-            cancellation_event=self.cancellation_event,
-            pause_event=self.pause_event,
-            use_cookie=config.get('use_cookie', False),
-            cookie_text=config.get('cookie_text', ''),
-            selected_cookie_file=config.get('selected_cookie_file'),
-            app_base_dir=config.get('app_base_dir'),
-            manga_filename_style_for_sort_check=config.get('manga_filename_style'),
-            processed_post_ids=config.get('processed_post_ids', [])
-        )
-        for batch in post_generator:
-            all_posts.extend(batch)
-        return all_posts
 
     def _handle_future_result(self, future: Future):
         """Callback executed when a worker task completes."""
@@ -261,9 +271,15 @@ class DownloadManager:
         """Cancels the current running session."""
         if not self.is_running:
             return
+        
+        if self.cancellation_event.is_set():
+            self._log("ℹ️ Cancellation already in progress.")
+            return
+
         self._log("⚠️ Cancellation requested by user...")
         self.cancellation_event.set()
+
         if self.thread_pool:
-            self.thread_pool.shutdown(wait=False, cancel_futures=True)
-            
-        self.is_running = False
+            self._log("   Signaling all worker threads to stop and shutting down pool...")
+            self.thread_pool.shutdown(wait=False)
+

src/core/workers.py

@@ -1,4 +1,5 @@
 import os
+import sys
 import queue
 import re
 import threading
@@ -53,6 +54,24 @@ from ..utils.text_utils import (
 )
 from ..config.constants import *
 
+def robust_clean_name(name):
+    """A more robust function to remove illegal characters for filenames and folders."""
+    if not name:
+        return ""
+    # Removes illegal characters for Windows, macOS, and Linux: < > : " / \ | ? *
+    # Also removes control characters (ASCII 0-31) which are invisible but invalid.
+    illegal_chars_pattern = r'[\x00-\x1f<>:"/\\|?*]'
+    cleaned_name = re.sub(illegal_chars_pattern, '', name)
+    
+    # Remove leading/trailing spaces or periods, which can cause issues.
+    cleaned_name = cleaned_name.strip(' .')
+    
+    # If the name is empty after cleaning (e.g., it was only illegal chars),
+    # provide a safe fallback name.
+    if not cleaned_name:
+        return "untitled_folder" # Or "untitled_file" depending on context
+    return cleaned_name
+
 class PostProcessorSignals (QObject ):
     progress_signal =pyqtSignal (str )
     file_download_status_signal =pyqtSignal (bool )
@@ -63,7 +82,6 @@ class PostProcessorSignals (QObject ):
     worker_finished_signal = pyqtSignal(tuple)
 
 class PostProcessorWorker:
-
     def __init__(self, post_data, download_root, known_names,
                  filter_character_list, emitter,
                  unwanted_keywords, filter_mode, skip_zip,
@@ -103,7 +121,10 @@ class PostProcessorWorker:
                  text_export_format='txt',
                  single_pdf_mode=False,
                  project_root_dir=None,
-                 processed_post_ids=None
+                 processed_post_ids=None,
+                 multipart_scope='both', 
+                 multipart_parts_count=4, 
+                 multipart_min_size_mb=100 
                  ):
         self.post = post_data
         self.download_root = download_root
@@ -165,7 +186,9 @@ class PostProcessorWorker:
         self.single_pdf_mode = single_pdf_mode
         self.project_root_dir = project_root_dir
         self.processed_post_ids = processed_post_ids if processed_post_ids is not None else []
-
+        self.multipart_scope = multipart_scope 
+        self.multipart_parts_count = multipart_parts_count 
+        self.multipart_min_size_mb = multipart_min_size_mb 
         if self.compress_images and Image is None:
             self.logger("⚠️ Image compression disabled: Pillow library not found.")
             self.compress_images = False
@@ -200,7 +223,7 @@ class PostProcessorWorker:
             return self .dynamic_filter_holder .get_filters ()
         return self .filter_character_list_objects_initial 
     
-    def _download_single_file(self, file_info, target_folder_path, headers, original_post_id_for_log, skip_event,
+    def _download_single_file(self, file_info, target_folder_path, post_page_url, original_post_id_for_log, skip_event,
                                 post_title="", file_index_in_post=0, num_files_in_this_post=1,
                                 manga_date_file_counter_ref=None,
                                 forced_filename_override=None,
@@ -214,6 +237,11 @@ class PostProcessorWorker:
         if self.check_cancel() or (skip_event and skip_event.is_set()):
             return 0, 1, "", False, FILE_DOWNLOAD_STATUS_SKIPPED, None
 
+        file_download_headers = {
+            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36',
+            'Referer': post_page_url
+        }
+
         file_url = file_info.get('url')
         cookies_to_use_for_file = None
         if self.use_cookie:
@@ -232,34 +260,28 @@ class PostProcessorWorker:
                         self.logger(f"   -> Skip File (Keyword in Original Name '{skip_word}'): '{api_original_filename}'. Scope: {self.skip_words_scope}")
                         return 0, 1, api_original_filename, False, FILE_DOWNLOAD_STATUS_SKIPPED, None
 
-            cleaned_original_api_filename = clean_filename(api_original_filename)
+            cleaned_original_api_filename = robust_clean_name(api_original_filename)
             original_filename_cleaned_base, original_ext = os.path.splitext(cleaned_original_api_filename)
             if not original_ext.startswith('.'): original_ext = '.' + original_ext if original_ext else ''
 
             if self.manga_mode_active:
                 if self.manga_filename_style == STYLE_ORIGINAL_NAME:
-                    # Get the post's publication or added date
                     published_date_str = self.post.get('published')
                     added_date_str = self.post.get('added')
-                    formatted_date_str = "nodate"  # Fallback if no date is found
-
+                    formatted_date_str = "nodate"
                     date_to_use_str = published_date_str or added_date_str
-
                     if date_to_use_str:
                         try:
-                            # Extract just the YYYY-MM-DD part from the timestamp
                             formatted_date_str = date_to_use_str.split('T')[0]
                         except Exception:
                             self.logger(f"     ⚠️ Could not parse date '{date_to_use_str}'. Using 'nodate' prefix.")
                     else:
                         self.logger(f"     ⚠️ Post ID {original_post_id_for_log} has no date. Using 'nodate' prefix.")
-
-                    # Combine the date with the cleaned original filename
                     filename_to_save_in_main_path = f"{formatted_date_str}_{cleaned_original_api_filename}"
                     was_original_name_kept_flag = True
                 elif self.manga_filename_style == STYLE_POST_TITLE:
                     if post_title and post_title.strip():
-                        cleaned_post_title_base = clean_filename(post_title.strip())
+                        cleaned_post_title_base = robust_clean_name(post_title.strip())
                         if num_files_in_this_post > 1:
                             if file_index_in_post == 0:
                                 filename_to_save_in_main_path = f"{cleaned_post_title_base}{original_ext}"
@@ -280,7 +302,7 @@ class PostProcessorWorker:
                             manga_date_file_counter_ref[0] += 1
                         base_numbered_name = f"{counter_val_for_filename:03d}"
                         if self.manga_date_prefix and self.manga_date_prefix.strip():
-                            cleaned_prefix = clean_filename(self.manga_date_prefix.strip())
+                            cleaned_prefix = robust_clean_name(self.manga_date_prefix.strip())
                             if cleaned_prefix:
                                 filename_to_save_in_main_path = f"{cleaned_prefix} {base_numbered_name}{original_ext}"
                             else:
@@ -297,7 +319,7 @@ class PostProcessorWorker:
                         with counter_lock:
                             counter_val_for_filename = manga_global_file_counter_ref[0]
                             manga_global_file_counter_ref[0] += 1
-                        cleaned_post_title_base_for_global = clean_filename(post_title.strip() if post_title and post_title.strip() else "post")
+                        cleaned_post_title_base_for_global = robust_clean_name(post_title.strip() if post_title and post_title.strip() else "post")
                         filename_to_save_in_main_path = f"{cleaned_post_title_base_for_global}_{counter_val_for_filename:03d}{original_ext}"
                     else:
                         self.logger(f"⚠️ Manga Title+GlobalNum Mode: Counter ref not provided or malformed for '{api_original_filename}'. Using original. Ref: {manga_global_file_counter_ref}")
@@ -329,8 +351,8 @@ class PostProcessorWorker:
                         self.logger(f"     ⚠️ Post ID {original_post_id_for_log} missing both 'published' and 'added' dates for STYLE_DATE_POST_TITLE. Using 'nodate'.")
 
                     if post_title and post_title.strip():
-                        temp_cleaned_title = clean_filename(post_title.strip())
-                        if not temp_cleaned_title or temp_cleaned_title.startswith("untitled_file"):
+                        temp_cleaned_title = robust_clean_name(post_title.strip())
+                        if not temp_cleaned_title or temp_cleaned_title.startswith("untitled_folder"):
                             self.logger(f"⚠️ Manga mode (Date+PostTitle Style): Post title for post {original_post_id_for_log} ('{post_title}') was empty or generic after cleaning. Using 'post' as title part.")
                             cleaned_post_title_for_filename = "post"
                         else:
@@ -409,6 +431,33 @@ class PostProcessorWorker:
         unique_id_for_part_file = uuid.uuid4().hex[:8]
         unique_part_file_stem_on_disk = f"{temp_file_base_for_unique_part}_{unique_id_for_part_file}"
         max_retries = 3
+        if not self.keep_in_post_duplicates:
+            final_save_path_check = os.path.join(target_folder_path, filename_to_save_in_main_path)
+            if os.path.exists(final_save_path_check):
+                try:
+                    with requests.head(file_url, headers=file_download_headers, timeout=15, cookies=cookies_to_use_for_file, allow_redirects=True) as head_response:
+                        head_response.raise_for_status()
+                        expected_size = int(head_response.headers.get('Content-Length', -1))
+                    
+                    actual_size = os.path.getsize(final_save_path_check)
+
+                    if expected_size != -1 and actual_size == expected_size:
+                        self.logger(f"   -> Skip (File Exists & Complete): '{filename_to_save_in_main_path}' is already on disk with the correct size.")
+                        try:
+                            md5_hasher = hashlib.md5()
+                            with open(final_save_path_check, 'rb') as f_verify:
+                                for chunk in iter(lambda: f_verify.read(8192), b""):
+                                    md5_hasher.update(chunk)
+                            with self.downloaded_hash_counts_lock:
+                                self.downloaded_hash_counts[md5_hasher.hexdigest()] += 1
+                        except Exception as hash_exc:
+                             self.logger(f"   ⚠️ Could not hash existing file '{filename_to_save_in_main_path}' for session: {hash_exc}")
+                        return 0, 1, filename_to_save_in_main_path, was_original_name_kept_flag, FILE_DOWNLOAD_STATUS_SKIPPED, None
+                    else:
+                        self.logger(f"   ⚠️ File '{filename_to_save_in_main_path}' exists but is incomplete (Expected: {expected_size}, Actual: {actual_size}). Re-downloading.")
+                except requests.RequestException as e:
+                    self.logger(f"   ⚠️ Could not verify size of existing file '{filename_to_save_in_main_path}': {e}. Proceeding with download.")
+        
         retry_delay = 5
         downloaded_size_bytes = 0
         calculated_file_hash = None
@@ -429,13 +478,30 @@ class PostProcessorWorker:
                     self.logger(f"   Retrying download for '{api_original_filename}' (Overall Attempt {attempt_num_single_stream + 1}/{max_retries + 1})...")
                     time.sleep(retry_delay * (2 ** (attempt_num_single_stream - 1)))
                 self._emit_signal('file_download_status', True)
-                response = requests.get(file_url, headers=headers, timeout=(15, 300), stream=True, cookies=cookies_to_use_for_file)
+                response = requests.get(file_url, headers=file_download_headers, timeout=(15, 300), stream=True, cookies=cookies_to_use_for_file)
+              
                 response.raise_for_status()
                 total_size_bytes = int(response.headers.get('Content-Length', 0))
-                num_parts_for_file = min(self.num_file_threads, MAX_PARTS_FOR_MULTIPART_DOWNLOAD)
+                num_parts_for_file = min(self.multipart_parts_count, MAX_PARTS_FOR_MULTIPART_DOWNLOAD)
+           
+                file_is_eligible_by_scope = False
+                if self.multipart_scope == 'videos':
+                    if is_video(api_original_filename):
+                        file_is_eligible_by_scope = True
+                elif self.multipart_scope == 'archives':
+                    if is_archive(api_original_filename):
+                        file_is_eligible_by_scope = True
+                elif self.multipart_scope == 'both':
+                    if is_video(api_original_filename) or is_archive(api_original_filename):
+                        file_is_eligible_by_scope = True
+
+                min_size_in_bytes = self.multipart_min_size_mb * 1024 * 1024
+
                 attempt_multipart = (self.allow_multipart_download and MULTIPART_DOWNLOADER_AVAILABLE and
-                                     num_parts_for_file > 1 and total_size_bytes > MIN_SIZE_FOR_MULTIPART_DOWNLOAD and
+                                     file_is_eligible_by_scope and
+                                     num_parts_for_file > 1 and total_size_bytes > min_size_in_bytes and 
                                      'bytes' in response.headers.get('Accept-Ranges', '').lower())
+          
                 if self._check_pause(f"Multipart decision for '{api_original_filename}'"): break
 
                 if attempt_multipart:
@@ -444,7 +510,7 @@ class PostProcessorWorker:
                         response_for_this_attempt = None
                     mp_save_path_for_unique_part_stem_arg = os.path.join(target_folder_path, f"{unique_part_file_stem_on_disk}{temp_file_ext_for_unique_part}")
                     mp_success, mp_bytes, mp_hash, mp_file_handle = download_file_in_parts(
-                        file_url, mp_save_path_for_unique_part_stem_arg, total_size_bytes, num_parts_for_file, headers, api_original_filename,
+                        file_url, mp_save_path_for_unique_part_stem_arg, total_size_bytes, num_parts_for_file, file_download_headers, api_original_filename,
                         emitter_for_multipart=self.emitter, cookies_for_chunk_session=cookies_to_use_for_file,
                         cancellation_event=self.cancellation_event, skip_event=skip_event, logger_func=self.logger,
                         pause_event=self.pause_event
@@ -453,7 +519,7 @@ class PostProcessorWorker:
                         download_successful_flag = True
                         downloaded_size_bytes = mp_bytes
                         calculated_file_hash = mp_hash
-                        downloaded_part_file_path = mp_save_path_for_unique_part_stem_arg + ".part"
+                        downloaded_part_file_path = mp_save_path_for_unique_part_stem_arg
                         if mp_file_handle: mp_file_handle.close()
                         break
                     else:
@@ -519,12 +585,15 @@ class PostProcessorWorker:
                 if isinstance(e, requests.exceptions.ConnectionError) and ("Failed to resolve" in str(e) or "NameResolutionError" in str(e)):
                     self.logger("   💡 This looks like a DNS resolution problem. Please check your internet connection, DNS settings, or VPN.")
             except requests.exceptions.RequestException as e:
-                self.logger(f"   ❌ Download Error (Non-Retryable): {api_original_filename}. Error: {e}")
-                last_exception_for_retry_later = e
-                is_permanent_error = True
-                if ("Failed to resolve" in str(e) or "NameResolutionError" in str(e)):
-                    self.logger("   💡 This looks like a DNS resolution problem. Please check your internet connection, DNS settings, or VPN.")
-                break
+                if e.response is not None and e.response.status_code == 403:
+                    self.logger(f"   ⚠️ Download Error (403 Forbidden): {api_original_filename}. This often requires valid cookies.")
+                    self.logger(f"      Will retry... Check your 'Use Cookie' settings if this persists.")
+                    last_exception_for_retry_later = e
+                else:
+                    self.logger(f"   ❌ Download Error (Non-Retryable): {api_original_filename}. Error: {e}")
+                    last_exception_for_retry_later = e
+                    is_permanent_error = True
+                    break
             except Exception as e:
                 self.logger(f"   ❌ Unexpected Download Error: {api_original_filename}: {e}\n{traceback.format_exc(limit=2)}")
                 last_exception_for_retry_later = e
@@ -601,26 +670,22 @@ class PostProcessorWorker:
                 self.logger(f"   🔄 Compressing '{api_original_filename}' to WebP...")
                 try:
                     with Image.open(downloaded_part_file_path) as img:
-                        # Convert to RGB to avoid issues with paletted images or alpha channels in WebP
                         if img.mode not in ('RGB', 'RGBA'):
                             img = img.convert('RGBA')
                         
-                        # Use an in-memory buffer to save the compressed image
                         output_buffer = BytesIO()
                         img.save(output_buffer, format='WebP', quality=85)
                         
-                        # This buffer now holds the compressed data
                         data_to_write_io = output_buffer
                         
-                        # Update the filename to use the .webp extension
                         base, _ = os.path.splitext(filename_to_save_in_main_path)
                         filename_to_save_in_main_path = f"{base}.webp"
                         self.logger(f"   ✅ Compression successful. New size: {len(data_to_write_io.getvalue()) / (1024*1024):.2f} MB")
 
                 except Exception as e_compress:
                     self.logger(f"   ⚠️ Failed to compress '{api_original_filename}': {e_compress}. Saving original file instead.")
-                    data_to_write_io = None # Ensure we fall back to saving the original
-
+                    data_to_write_io = None
+            
             effective_save_folder = target_folder_path
             base_name, extension = os.path.splitext(filename_to_save_in_main_path)
             counter = 1
@@ -637,17 +702,14 @@ class PostProcessorWorker:
 
             try:
                 if data_to_write_io:
-                    # Write the compressed data from the in-memory buffer
                     with open(final_save_path, 'wb') as f_out:
                         f_out.write(data_to_write_io.getvalue())
-                    # Clean up the original downloaded part file
                     if downloaded_part_file_path and os.path.exists(downloaded_part_file_path):
                         try:
                             os.remove(downloaded_part_file_path)
                         except OSError as e_rem:
                             self.logger(f"  -> Failed to remove .part after compression: {e_rem}")
                 else:
-                    # No compression was done, just rename the original file
                     if downloaded_part_file_path and os.path.exists(downloaded_part_file_path):
                         time.sleep(0.1)
                         os.rename(downloaded_part_file_path, final_save_path)
@@ -694,7 +756,7 @@ class PostProcessorWorker:
                         self.logger(f"   -> Failed to remove partially saved file: {final_save_path}")
 
                 permanent_failure_details = {
-                    'file_info': file_info, 'target_folder_path': target_folder_path, 'headers': headers,
+                    'file_info': file_info, 'target_folder_path': target_folder_path, 'headers': file_download_headers,
                     'original_post_id_for_log': original_post_id_for_log, 'post_title': post_title,
                     'file_index_in_post': file_index_in_post, 'num_files_in_this_post': num_files_in_this_post,
                     'forced_filename_override': filename_to_save_in_main_path,
@@ -708,7 +770,7 @@ class PostProcessorWorker:
             details_for_failure = {
                 'file_info': file_info, 
                 'target_folder_path': target_folder_path, 
-                'headers': headers,
+                'headers': file_download_headers,
                 'original_post_id_for_log': original_post_id_for_log, 
                 'post_title': post_title,
                 'file_index_in_post': file_index_in_post, 
@@ -740,8 +802,11 @@ class PostProcessorWorker:
             history_data_for_this_post = None
 
             parsed_api_url = urlparse(self.api_url_input)
-            referer_url = f"https://{parsed_api_url.netloc}/"
-            headers = {'User-Agent': 'Mozilla/5.0', 'Referer': referer_url, 'Accept': '*/*'}
+            post_data = self.post
+            post_id = post_data.get('id', 'unknown_id')
+
+            post_page_url = f"https://{parsed_api_url.netloc}/{self.service}/user/{self.user_id}/post/{post_id}"
+            headers = {'User-Agent': 'Mozilla/5.0', 'Referer': post_page_url, 'Accept': '*/*'}
             link_pattern = re.compile(r"""<a\s+.*?href=["'](https?://[^"']+)["'][^>]*>(.*?)</a>""", re.IGNORECASE | re.DOTALL)
             post_data = self.post
             post_title = post_data.get('title', '') or 'untitled_post'
@@ -751,6 +816,17 @@ class PostProcessorWorker:
 
             effective_unwanted_keywords_for_folder_naming = self.unwanted_keywords.copy()
             is_full_creator_download_no_char_filter = not self.target_post_id_from_initial_url and not current_character_filters
+           
+            if (self.show_external_links or self.extract_links_only):
+                embed_data = post_data.get('embed')
+                if isinstance(embed_data, dict) and embed_data.get('url'):
+                    embed_url = embed_data['url']
+                    embed_subject = embed_data.get('subject', embed_url) # Use subject as link text, fallback to URL
+                    platform = get_link_platform(embed_url)
+                    
+                    self.logger(f"   🔗 Found embed link: {embed_url}")
+                    self._emit_signal('external_link', post_title, embed_subject, embed_url, platform, "")
+           
             if is_full_creator_download_no_char_filter and self.creator_download_folder_ignore_words:
                 self.logger(f"   Applying creator download specific folder ignore words ({len(self.creator_download_folder_ignore_words)} words).")
                 effective_unwanted_keywords_for_folder_naming.update(self.creator_download_folder_ignore_words)
@@ -789,8 +865,8 @@ class PostProcessorWorker:
 
             all_files_from_post_api_for_char_check = []
             api_file_domain_for_char_check = urlparse(self.api_url_input).netloc
-            if not api_file_domain_for_char_check or not any(d in api_file_domain_for_char_check.lower() for d in ['kemono.su', 'kemono.party', 'coomer.su', 'coomer.party']):
-                api_file_domain_for_char_check = "kemono.su" if "kemono" in self.service.lower() else "coomer.party"
+            if not api_file_domain_for_char_check or not any(d in api_file_domain_for_char_check.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
+                api_file_domain_for_char_check = "kemono.cr" if "kemono" in self.service.lower() else "coomer.st"
             if post_main_file_info and isinstance(post_main_file_info, dict) and post_main_file_info.get('path'):
                 original_api_name = post_main_file_info.get('name') or os.path.basename(post_main_file_info['path'].lstrip('/'))
                 if original_api_name:
@@ -833,9 +909,9 @@ class PostProcessorWorker:
                     try:
                         parsed_input_url_for_comments = urlparse(self.api_url_input)
                         api_domain_for_comments = parsed_input_url_for_comments.netloc
-                        if not any(d in api_domain_for_comments.lower() for d in ['kemono.su', 'kemono.party', 'coomer.su', 'coomer.party']):
+                        if not any(d in api_domain_for_comments.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
                             self.logger(f"⚠️ Unrecognized domain '{api_domain_for_comments}' for comment API. Defaulting based on service.")
-                            api_domain_for_comments = "kemono.su" if "kemono" in self.service.lower() else "coomer.party"
+                            api_domain_for_comments = "kemono.cr" if "kemono" in self.service.lower() else "coomer.st"
                         comments_data = fetch_post_comments(
                             api_domain_for_comments, self.service, self.user_id, post_id,
                             headers, self.logger, self.cancellation_event, self.pause_event,
@@ -996,7 +1072,7 @@ class PostProcessorWorker:
                     determined_post_save_path_for_history = os.path.join(determined_post_save_path_for_history, base_folder_names_for_post_content[0])
 
             if not self.extract_links_only and self.use_post_subfolders:
-                cleaned_post_title_for_sub = clean_folder_name(post_title)
+                cleaned_post_title_for_sub = robust_clean_name(post_title)
                 post_id_for_fallback = self.post.get('id', 'unknown_id')
 
                 if not cleaned_post_title_for_sub or cleaned_post_title_for_sub == "untitled_folder":
@@ -1175,11 +1251,18 @@ class PostProcessorWorker:
                             if FPDF:
                                 self.logger(f"   Creating formatted PDF for {'comments' if self.text_only_scope == 'comments' else 'content'}...")
                                 pdf = PDF()
+                                if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
+                                    # If the application is run as a bundled exe, _MEIPASS is the temp folder
+                                    base_path = sys._MEIPASS
+                                else:
+                                    # If running as a normal .py script, use the project_root_dir
+                                    base_path = self.project_root_dir
+
                                 font_path = ""
                                 bold_font_path = ""
-                                if self.project_root_dir:
-                                    font_path = os.path.join(self.project_root_dir, 'data', 'dejavu-sans', 'DejaVuSans.ttf')
-                                    bold_font_path = os.path.join(self.project_root_dir, 'data', 'dejavu-sans', 'DejaVuSans-Bold.ttf')
+                                if base_path:
+                                    font_path = os.path.join(base_path, 'data', 'dejavu-sans', 'DejaVuSans.ttf')
+                                    bold_font_path = os.path.join(base_path, 'data', 'dejavu-sans', 'DejaVuSans-Bold.ttf')
 
                                 try:
                                     if not os.path.exists(font_path): raise RuntimeError(f"Font file not found: {font_path}")
@@ -1312,9 +1395,8 @@ class PostProcessorWorker:
 
             all_files_from_post_api = []
             api_file_domain = urlparse(self.api_url_input).netloc
-            if not api_file_domain or not any(d in api_file_domain.lower() for d in ['kemono.su', 'kemono.party', 'coomer.su', 'coomer.party']):
-                api_file_domain = "kemono.su" if "kemono" in self.service.lower() else "coomer.party"
-
+            if not api_file_domain or not any(d in api_file_domain.lower() for d in ['kemono.su', 'kemono.party', 'kemono.cr', 'coomer.su', 'coomer.party', 'coomer.st']):
+                api_file_domain = "kemono.cr" if "kemono" in self.service.lower() else "coomer.st"
             if post_main_file_info and isinstance(post_main_file_info, dict) and post_main_file_info.get('path'):
                 file_path = post_main_file_info['path'].lstrip('/')
                 original_api_name = post_main_file_info.get('name') or os.path.basename(file_path)
@@ -1572,7 +1654,7 @@ class PostProcessorWorker:
                             self._download_single_file,
                             file_info=file_info_to_dl,
                             target_folder_path=current_path_for_file_instance,
-                            headers=headers, original_post_id_for_log=post_id, skip_event=self.skip_current_file_flag,
+                            post_page_url=post_page_url,  original_post_id_for_log=post_id, skip_event=self.skip_current_file_flag,
                             post_title=post_title, manga_date_file_counter_ref=manga_date_counter_to_pass,
                             manga_global_file_counter_ref=manga_global_counter_to_pass, folder_context_name_for_history=folder_context_for_file,
                             file_index_in_post=file_idx, num_files_in_this_post=len(files_to_download_info_list)
@@ -1666,10 +1748,12 @@ class PostProcessorWorker:
             if not self.extract_links_only and self.use_post_subfolders and total_downloaded_this_post == 0:
                 path_to_check_for_emptiness = determined_post_save_path_for_history
                 try:
+                    # Check if the path is a directory and if it's empty
                     if os.path.isdir(path_to_check_for_emptiness) and not os.listdir(path_to_check_for_emptiness):
                         self.logger(f"   🗑️ Removing empty post-specific subfolder: '{path_to_check_for_emptiness}'")
                         os.rmdir(path_to_check_for_emptiness)
                 except OSError as e_rmdir:
+                    # Log if removal fails for any reason (e.g., permissions)
                     self.logger(f"   ⚠️ Could not remove empty post-specific subfolder '{path_to_check_for_emptiness}': {e_rmdir}")
 
             result_tuple = (total_downloaded_this_post, total_skipped_this_post,
@@ -1678,6 +1762,15 @@ class PostProcessorWorker:
                             None)
 
         finally:
+            if not self.extract_links_only and self.use_post_subfolders and total_downloaded_this_post == 0:
+                path_to_check_for_emptiness = determined_post_save_path_for_history
+                try:
+                    if os.path.isdir(path_to_check_for_emptiness) and not os.listdir(path_to_check_for_emptiness):
+                        self.logger(f"   🗑️ Removing empty post-specific subfolder: '{path_to_check_for_emptiness}'")
+                        os.rmdir(path_to_check_for_emptiness)
+                except OSError as e_rmdir:
+                    self.logger(f"   ⚠️ Could not remove potentially empty subfolder '{path_to_check_for_emptiness}': {e_rmdir}")
+
             self._emit_signal('worker_finished', result_tuple)
         
         return result_tuple
@@ -1718,6 +1811,8 @@ class DownloadThread(QThread):
                  remove_from_filename_words_list=None,
                  manga_date_prefix='',
                  allow_multipart_download=True,
+                 multipart_parts_count=4, 
+                 multipart_min_size_mb=100, 
                  selected_cookie_file=None,
                  override_output_dir=None,
                  app_base_dir=None,
@@ -1780,6 +1875,8 @@ class DownloadThread(QThread):
         self.remove_from_filename_words_list = remove_from_filename_words_list
         self.manga_date_prefix = manga_date_prefix
         self.allow_multipart_download = allow_multipart_download
+        self.multipart_parts_count = multipart_parts_count 
+        self.multipart_min_size_mb = multipart_min_size_mb 
         self.selected_cookie_file = selected_cookie_file
         self.app_base_dir = app_base_dir
         self.cookie_text = cookie_text
@@ -1921,6 +2018,8 @@ class DownloadThread(QThread):
                         'text_only_scope': self.text_only_scope,
                         'text_export_format': self.text_export_format,
                         'single_pdf_mode': self.single_pdf_mode,
+                        'multipart_parts_count': self.multipart_parts_count, 
+                        'multipart_min_size_mb': self.multipart_min_size_mb, 
                         'project_root_dir': self.project_root_dir,
                     }
 

src/services/drive_downloader.py

@@ -3,15 +3,19 @@ import os
 import re
 import traceback
 import json
+import base64
+import time
 from urllib.parse import urlparse, urlunparse, parse_qs, urlencode
 
 # --- Third-Party Library Imports ---
+# Make sure to install these: pip install requests pycryptodome gdown
 import requests
+
 try:
-    from mega import Mega
-    MEGA_AVAILABLE = True
+    from Crypto.Cipher import AES
+    PYCRYPTODOME_AVAILABLE = True
 except ImportError:
-    MEGA_AVAILABLE = False
+    PYCRYPTODOME_AVAILABLE = False
 
 try:
     import gdown
@@ -19,17 +23,15 @@ try:
 except ImportError:
     GDRIVE_AVAILABLE = False
 
-# --- Helper Functions ---
+# --- Constants ---
+MEGA_API_URL = "https://g.api.mega.co.nz"
+
+# --- Helper Functions (Original and New) ---
 
 def _get_filename_from_headers(headers):
     """
     Extracts a filename from the Content-Disposition header.
-
-    Args:
-        headers (dict): A dictionary of HTTP response headers.
-
-    Returns:
-        str or None: The extracted filename, or None if not found.
+    (This is from your original file and is kept for Dropbox downloads)
     """
     cd = headers.get('content-disposition')
     if not cd:
@@ -37,64 +39,180 @@ def _get_filename_from_headers(headers):
     
     fname_match = re.findall('filename="?([^"]+)"?', cd)
     if fname_match:
-        # Sanitize the filename to prevent directory traversal issues
-        # and remove invalid characters for most filesystems.
         sanitized_name = re.sub(r'[<>:"/\\|?*]', '_', fname_match[0].strip())
         return sanitized_name
         
     return None
 
-# --- Main Service Downloader Functions ---
+# --- NEW: Helper functions for Mega decryption ---
+
+def urlb64_to_b64(s):
+    """Converts a URL-safe base64 string to a standard base64 string."""
+    s = s.replace('-', '+').replace('_', '/')
+    s += '=' * (-len(s) % 4)
+    return s
+
+def b64_to_bytes(s):
+    """Decodes a URL-safe base64 string to bytes."""
+    return base64.b64decode(urlb64_to_b64(s))
+
+def bytes_to_hex(b):
+    """Converts bytes to a hex string."""
+    return b.hex()
+
+def hex_to_bytes(h):
+    """Converts a hex string to bytes."""
+    return bytes.fromhex(h)
+
+def hrk2hk(hex_raw_key):
+    """Derives the final AES key from the raw key components for Mega."""
+    key_part1 = int(hex_raw_key[0:16], 16)
+    key_part2 = int(hex_raw_key[16:32], 16)
+    key_part3 = int(hex_raw_key[32:48], 16)
+    key_part4 = int(hex_raw_key[48:64], 16)
+    
+    final_key_part1 = key_part1 ^ key_part3
+    final_key_part2 = key_part2 ^ key_part4
+    
+    return f'{final_key_part1:016x}{final_key_part2:016x}'
+
+def decrypt_at(at_b64, key_bytes):
+    """Decrypts the 'at' attribute to get file metadata."""
+    at_bytes = b64_to_bytes(at_b64)
+    iv = b'\0' * 16
+    cipher = AES.new(key_bytes, AES.MODE_CBC, iv)
+    decrypted_at = cipher.decrypt(at_bytes)
+    return decrypted_at.decode('utf-8').strip('\0').replace('MEGA', '')
+
+# --- NEW: Core Logic for Mega Downloads ---
+
+def get_mega_file_info(file_id, file_key, session, logger_func):
+    """Fetches file metadata and the temporary download URL from the Mega API."""
+    try:
+        hex_raw_key = bytes_to_hex(b64_to_bytes(file_key))
+        hex_key = hrk2hk(hex_raw_key)
+        key_bytes = hex_to_bytes(hex_key)
+
+        # Request file attributes
+        payload = [{"a": "g", "p": file_id}]
+        response = session.post(f"{MEGA_API_URL}/cs", json=payload, timeout=20)
+        response.raise_for_status()
+        res_json = response.json()
+
+        if isinstance(res_json, list) and isinstance(res_json[0], int) and res_json[0] < 0:
+            logger_func(f"   [Mega] ❌ API Error: {res_json[0]}. The link may be invalid or removed.")
+            return None
+
+        file_size = res_json[0]['s']
+        at_b64 = res_json[0]['at']
+
+        # Decrypt attributes to get the file name
+        at_dec_json_str = decrypt_at(at_b64, key_bytes)
+        at_dec_json = json.loads(at_dec_json_str)
+        file_name = at_dec_json['n']
+
+        # Request the temporary download URL
+        payload = [{"a": "g", "g": 1, "p": file_id}]
+        response = session.post(f"{MEGA_API_URL}/cs", json=payload, timeout=20)
+        response.raise_for_status()
+        res_json = response.json()
+        dl_temp_url = res_json[0]['g']
+
+        return {
+            'file_name': file_name,
+            'file_size': file_size,
+            'dl_url': dl_temp_url,
+            'hex_raw_key': hex_raw_key
+        }
+    except (requests.RequestException, json.JSONDecodeError, KeyError, ValueError) as e:
+        logger_func(f"   [Mega] ❌ Failed to get file info: {e}")
+        return None
+
+def download_and_decrypt_mega_file(info, download_path, logger_func):
+    """Downloads the file and decrypts it chunk by chunk, reporting progress."""
+    file_name = info['file_name']
+    file_size = info['file_size']
+    dl_url = info['dl_url']
+    hex_raw_key = info['hex_raw_key']
+
+    final_path = os.path.join(download_path, file_name)
+
+    if os.path.exists(final_path) and os.path.getsize(final_path) == file_size:
+        logger_func(f"   [Mega] ℹ️ File '{file_name}' already exists with the correct size. Skipping.")
+        return
+
+    # Prepare for decryption
+    key = hex_to_bytes(hrk2hk(hex_raw_key))
+    iv_hex = hex_raw_key[32:48] + '0000000000000000'
+    iv_bytes = hex_to_bytes(iv_hex)
+    cipher = AES.new(key, AES.MODE_CTR, initial_value=iv_bytes, nonce=b'')
+
+    try:
+        with requests.get(dl_url, stream=True, timeout=(15, 300)) as r:
+            r.raise_for_status()
+            downloaded_bytes = 0
+            last_log_time = time.time()
+            
+            with open(final_path, 'wb') as f:
+                for chunk in r.iter_content(chunk_size=8192):
+                    if not chunk:
+                        continue
+                    decrypted_chunk = cipher.decrypt(chunk)
+                    f.write(decrypted_chunk)
+                    downloaded_bytes += len(chunk)
+                    
+                    # Log progress every second
+                    current_time = time.time()
+                    if current_time - last_log_time > 1:
+                        progress_percent = (downloaded_bytes / file_size) * 100 if file_size > 0 else 0
+                        logger_func(f"   [Mega] Downloading '{file_name}': {downloaded_bytes/1024/1024:.2f}MB / {file_size/1024/1024:.2f}MB ({progress_percent:.1f}%)")
+                        last_log_time = current_time
+        
+        logger_func(f"   [Mega] ✅ Successfully downloaded '{file_name}' to '{download_path}'")
+    except requests.RequestException as e:
+        logger_func(f"   [Mega] ❌ Download failed for '{file_name}': {e}")
+    except IOError as e:
+        logger_func(f"   [Mega] ❌ Could not write to file '{final_path}': {e}")
+    except Exception as e:
+        logger_func(f"   [Mega] ❌ An unexpected error occurred during download/decryption: {e}")
+
+
+# --- REPLACEMENT Main Service Downloader Function for Mega ---
 
 def download_mega_file(mega_url, download_path, logger_func=print):
     """
-    Downloads a file from a Mega.nz URL.
-    Handles both public links and links that include a decryption key.
+    Downloads a file from a Mega.nz URL using direct requests and decryption.
+    This replaces the old mega.py implementation.
     """
-    if not MEGA_AVAILABLE:
-        logger_func("❌ Mega download failed: 'mega.py' library is not installed.")
+    if not PYCRYPTODOME_AVAILABLE:
+        logger_func("❌ Mega download failed: 'pycryptodome' library is not installed. Please run: pip install pycryptodome")
         return
 
-    logger_func(f"   [Mega] Initializing Mega client...")
-    try:
-        mega = Mega()
-        # Anonymous login is sufficient for public links
-        m = mega.login()
+    logger_func(f"   [Mega] Initializing download for: {mega_url}")
+    
+    # Regex to capture file ID and key from both old and new URL formats
+    match = re.search(r'mega(?:\.co)?\.nz/(?:file/|#!)?([a-zA-Z0-9]+)(?:#|!)([a-zA-Z0-9_.-]+)', mega_url)
+    if not match:
+        logger_func(f"   [Mega] ❌ Error: Invalid Mega URL format.")
+        return
+        
+    file_id = match.group(1)
+    file_key = match.group(2)
 
-        # --- MODIFIED PART: Added error handling for invalid links ---
-        try:
-            file_details = m.find(mega_url)
-            if file_details is None:
-                logger_func(f"   [Mega] ❌ Download failed. The link appears to be invalid or has been taken down: {mega_url}")
-                return
-        except (ValueError, json.JSONDecodeError) as e:
-            # This block catches the "Expecting value" error
-            logger_func(f"   [Mega] ❌ Download failed. The link is likely invalid or expired. Error: {e}")
-            return
-        except Exception as e:
-            # Catch other potential errors from the mega.py library
-            logger_func(f"   [Mega] ❌ An unexpected error occurred trying to access the link: {e}")
-            return
-        # --- END OF MODIFIED PART ---
+    session = requests.Session()
+    session.headers.update({'User-Agent': 'Kemono-Downloader-PyQt/1.0'})
+    
+    file_info = get_mega_file_info(file_id, file_key, session, logger_func)
+    if not file_info:
+        logger_func(f"   [Mega] ❌ Failed to get file info. The link may be invalid or expired. Aborting.")
+        return
 
-        filename = file_details[1]['a']['n']
-        logger_func(f"   [Mega] File found: '{filename}'. Starting download...")
+    logger_func(f"   [Mega] File found: '{file_info['file_name']}' (Size: {file_info['file_size'] / 1024 / 1024:.2f} MB)")
+    
+    download_and_decrypt_mega_file(file_info, download_path, logger_func)
 
-        # Sanitize filename before saving
-        safe_filename = "".join([c for c in filename if c.isalpha() or c.isdigit() or c in (' ', '.', '_', '-')]).rstrip()
-        final_path = os.path.join(download_path, safe_filename)
 
-        # Check if file already exists
-        if os.path.exists(final_path):
-            logger_func(f"   [Mega] ℹ️ File '{safe_filename}' already exists. Skipping download.")
-            return
-
-        # Start the download
-        m.download_url(mega_url, dest_path=download_path, dest_filename=safe_filename)
-        logger_func(f"   [Mega] ✅ Successfully downloaded '{safe_filename}' to '{download_path}'")
-
-    except Exception as e:
-        logger_func(f"   [Mega] ❌ An unexpected error occurred during the Mega download process: {e}")
+# --- ORIGINAL Functions for Google Drive and Dropbox (Unchanged) ---
 
 def download_gdrive_file(url, download_path, logger_func=print):
     """Downloads a file from a Google Drive link."""
@@ -103,12 +221,9 @@ def download_gdrive_file(url, download_path, logger_func=print):
         return
     try:
         logger_func(f"   [G-Drive] Starting download for: {url}")
-        # --- MODIFIED PART: Added a message and set quiet=True ---
         logger_func("   [G-Drive] Download in progress... This may take some time. Please wait.")
         
-        # By setting quiet=True, the progress bar will no longer be printed to the terminal.
         output_path = gdown.download(url, output=download_path, quiet=True, fuzzy=True)
-        # --- END OF MODIFIED PART ---
         
         if output_path and os.path.exists(output_path):
             logger_func(f"   [G-Drive] ✅ Successfully downloaded to '{output_path}'")
@@ -120,15 +235,9 @@ def download_gdrive_file(url, download_path, logger_func=print):
 def download_dropbox_file(dropbox_link, download_path=".", logger_func=print):
     """
     Downloads a file from a public Dropbox link by modifying the URL for direct download.
-
-    Args:
-        dropbox_link (str): The public Dropbox link to the file.
-        download_path (str): The directory to save the downloaded file.
-        logger_func (callable): Function to use for logging.
     """
     logger_func(f"   [Dropbox] Attempting to download: {dropbox_link}")
     
-    # Modify the Dropbox URL to force a direct download instead of showing the preview page.
     parsed_url = urlparse(dropbox_link)
     query_params = parse_qs(parsed_url.query)
     query_params['dl'] = ['1']
@@ -145,13 +254,11 @@ def download_dropbox_file(dropbox_link, download_path=".", logger_func=print):
         with requests.get(direct_download_url, stream=True, allow_redirects=True, timeout=(10, 300)) as r:
             r.raise_for_status()
             
-            # Determine filename from headers or URL
             filename = _get_filename_from_headers(r.headers) or os.path.basename(parsed_url.path) or "dropbox_file"
             full_save_path = os.path.join(download_path, filename)
             
             logger_func(f"   [Dropbox] Starting download of '{filename}'...")
             
-            # Write file to disk in chunks
             with open(full_save_path, 'wb') as f:
                 for chunk in r.iter_content(chunk_size=8192):
                     f.write(chunk)

src/services/multipart_downloader.py

@@ -1,4 +1,5 @@
 # --- Standard Library Imports ---
+# --- Standard Library Imports ---
 import os
 import time
 import hashlib
@@ -10,28 +11,49 @@ from concurrent.futures import ThreadPoolExecutor, as_completed
 
 # --- Third-Party Library Imports ---
 import requests
+MULTIPART_DOWNLOADER_AVAILABLE = True
 
 # --- Module Constants ---
 CHUNK_DOWNLOAD_RETRY_DELAY = 2
 MAX_CHUNK_DOWNLOAD_RETRIES = 1
 DOWNLOAD_CHUNK_SIZE_ITER = 1024 * 256  # 256 KB per iteration chunk
 
-# Flag to indicate if this module and its dependencies are available.
-# This was missing and caused the ImportError.
-MULTIPART_DOWNLOADER_AVAILABLE = True
-
 
 def _download_individual_chunk(
-    chunk_url, temp_file_path, start_byte, end_byte, headers,
+    chunk_url, chunk_temp_file_path, start_byte, end_byte, headers,
     part_num, total_parts, progress_data, cancellation_event,
     skip_event, pause_event, global_emit_time_ref, cookies_for_chunk,
     logger_func, emitter=None, api_original_filename=None
 ):
     """
-    Downloads a single segment (chunk) of a larger file. This function is
-    intended to be run in a separate thread by a ThreadPoolExecutor.
+    Downloads a single segment (chunk) of a larger file to its own unique part file.
+    This function is intended to be run in a separate thread by a ThreadPoolExecutor.
 
-    It handles retries, pauses, and cancellations for its specific chunk.
+    It handles retries, pauses, and cancellations for its specific chunk. If a
+    download fails, the partial chunk file is removed, allowing a clean retry later.
+
+    Args:
+        chunk_url (str): The URL to download the file from.
+        chunk_temp_file_path (str): The unique path to save this specific chunk
+                                    (e.g., 'my_video.mp4.part0').
+        start_byte (int): The starting byte for the Range header.
+        end_byte (int): The ending byte for the Range header.
+        headers (dict): The HTTP headers to use for the request.
+        part_num (int): The index of this chunk (e.g., 0 for the first part).
+        total_parts (int): The total number of chunks for the entire file.
+        progress_data (dict): A thread-safe dictionary for sharing progress.
+        cancellation_event (threading.Event): Event to signal cancellation.
+        skip_event (threading.Event): Event to signal skipping the file.
+        pause_event (threading.Event): Event to signal pausing the download.
+        global_emit_time_ref (list): A mutable list with one element (a timestamp)
+                                     to rate-limit UI updates.
+        cookies_for_chunk (dict): Cookies to use for the request.
+        logger_func (function): A function to log messages.
+        emitter (queue.Queue or QObject): Emitter for sending progress to the UI.
+        api_original_filename (str): The original filename for UI display.
+
+    Returns:
+        tuple: A tuple containing (bytes_downloaded, success_flag).
     """
     # --- Pre-download checks for control events ---
     if cancellation_event and cancellation_event.is_set():
@@ -49,103 +71,135 @@ def _download_individual_chunk(
             time.sleep(0.2)
         logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Download resumed.")
 
-    # Prepare headers for the specific byte range of this chunk
-    chunk_headers = headers.copy()
-    if end_byte != -1:
-        chunk_headers['Range'] = f"bytes={start_byte}-{end_byte}"
-    
-    bytes_this_chunk = 0
-    last_speed_calc_time = time.time()
-    bytes_at_last_speed_calc = 0
+    # Set this chunk's status to 'active' before starting the download.
+    with progress_data['lock']:
+        progress_data['chunks_status'][part_num]['active'] = True
 
-    # --- Retry Loop ---
-    for attempt in range(MAX_CHUNK_DOWNLOAD_RETRIES + 1):
-        if cancellation_event and cancellation_event.is_set():
-            return bytes_this_chunk, False
+    try:
+        # Prepare headers for the specific byte range of this chunk
+        chunk_headers = headers.copy()
+        if end_byte != -1:
+            chunk_headers['Range'] = f"bytes={start_byte}-{end_byte}"
 
-        try:
-            if attempt > 0:
-                logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Retrying (Attempt {attempt + 1}/{MAX_CHUNK_DOWNLOAD_RETRIES + 1})...")
-                time.sleep(CHUNK_DOWNLOAD_RETRY_DELAY * (2 ** (attempt - 1)))
-                last_speed_calc_time = time.time()
-                bytes_at_last_speed_calc = bytes_this_chunk
+        bytes_this_chunk = 0
+        last_speed_calc_time = time.time()
+        bytes_at_last_speed_calc = 0
 
-            logger_func(f"   🚀 [Chunk {part_num + 1}/{total_parts}] Starting download: bytes {start_byte}-{end_byte if end_byte != -1 else 'EOF'}")
-            
-            response = requests.get(chunk_url, headers=chunk_headers, timeout=(10, 120), stream=True, cookies=cookies_for_chunk)
-            response.raise_for_status()
+        # --- Retry Loop ---
+        for attempt in range(MAX_CHUNK_DOWNLOAD_RETRIES + 1):
+            if cancellation_event and cancellation_event.is_set():
+                return bytes_this_chunk, False
 
-            # --- Data Writing Loop ---
-            with open(temp_file_path, 'r+b') as f:
-                f.seek(start_byte)
-                for data_segment in response.iter_content(chunk_size=DOWNLOAD_CHUNK_SIZE_ITER):
-                    if cancellation_event and cancellation_event.is_set():
-                        return bytes_this_chunk, False
-                    if pause_event and pause_event.is_set():
-                        # Handle pausing during the download stream
-                        logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Paused...")
-                        while pause_event.is_set():
-                            if cancellation_event and cancellation_event.is_set(): return bytes_this_chunk, False
-                            time.sleep(0.2)
-                        logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Resumed.")
+            try:
+                if attempt > 0:
+                    logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Retrying (Attempt {attempt + 1}/{MAX_CHUNK_DOWNLOAD_RETRIES + 1})...")
+                    time.sleep(CHUNK_DOWNLOAD_RETRY_DELAY * (2 ** (attempt - 1)))
+                    last_speed_calc_time = time.time()
+                    bytes_at_last_speed_calc = bytes_this_chunk
 
-                    if data_segment:
-                        f.write(data_segment)
-                        bytes_this_chunk += len(data_segment)
-                        
-                        # Update shared progress data structure
-                        with progress_data['lock']:
-                            progress_data['total_downloaded_so_far'] += len(data_segment)
-                            progress_data['chunks_status'][part_num]['downloaded'] = bytes_this_chunk
-                            
-                            # Calculate and update speed for this chunk
-                            current_time = time.time()
-                            time_delta = current_time - last_speed_calc_time
-                            if time_delta > 0.5:
-                                bytes_delta = bytes_this_chunk - bytes_at_last_speed_calc
-                                current_speed_bps = (bytes_delta * 8) / time_delta if time_delta > 0 else 0
-                                progress_data['chunks_status'][part_num]['speed_bps'] = current_speed_bps
-                                last_speed_calc_time = current_time
-                                bytes_at_last_speed_calc = bytes_this_chunk
-                            
-                            # Emit progress signal to the UI via the queue
-                            if emitter and (current_time - global_emit_time_ref[0] > 0.25):
-                                global_emit_time_ref[0] = current_time
-                                status_list_copy = [dict(s) for s in progress_data['chunks_status']]
-                                if isinstance(emitter, queue.Queue):
-                                    emitter.put({'type': 'file_progress', 'payload': (api_original_filename, status_list_copy)})
-                                elif hasattr(emitter, 'file_progress_signal'):
-                                    emitter.file_progress_signal.emit(api_original_filename, status_list_copy)
-            
-            # If we reach here, the download for this chunk was successful
-            return bytes_this_chunk, True
+                logger_func(f"   🚀 [Chunk {part_num + 1}/{total_parts}] Starting download: bytes {start_byte}-{end_byte if end_byte != -1 else 'EOF'}")
 
-        except (requests.exceptions.ConnectionError, requests.exceptions.Timeout, http.client.IncompleteRead) as e:
-            logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Retryable error: {e}")
-        except requests.exceptions.RequestException as e:
-            logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Non-retryable error: {e}")
-            return bytes_this_chunk, False # Break loop on non-retryable errors
-        except Exception as e:
-            logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Unexpected error: {e}\n{traceback.format_exc(limit=1)}")
-            return bytes_this_chunk, False
+                response = requests.get(chunk_url, headers=chunk_headers, timeout=(10, 120), stream=True, cookies=cookies_for_chunk)
+                response.raise_for_status()
 
-    return bytes_this_chunk, False
+                # --- Data Writing Loop ---
+                # We open the unique chunk file in write-binary ('wb') mode.
+                # No more seeking is required.
+                with open(chunk_temp_file_path, 'wb') as f:
+                    for data_segment in response.iter_content(chunk_size=DOWNLOAD_CHUNK_SIZE_ITER):
+                        if cancellation_event and cancellation_event.is_set():
+                            return bytes_this_chunk, False
+                        if pause_event and pause_event.is_set():
+                            # Handle pausing during the download stream
+                            logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Paused...")
+                            while pause_event.is_set():
+                                if cancellation_event and cancellation_event.is_set(): return bytes_this_chunk, False
+                                time.sleep(0.2)
+                            logger_func(f"   [Chunk {part_num + 1}/{total_parts}] Resumed.")
+
+                        if data_segment:
+                            f.write(data_segment)
+                            bytes_this_chunk += len(data_segment)
+
+                            # Update shared progress data structure
+                            with progress_data['lock']:
+                                progress_data['total_downloaded_so_far'] += len(data_segment)
+                                progress_data['chunks_status'][part_num]['downloaded'] = bytes_this_chunk
+
+                                # Calculate and update speed for this chunk
+                                current_time = time.time()
+                                time_delta = current_time - last_speed_calc_time
+                                if time_delta > 0.5:
+                                    bytes_delta = bytes_this_chunk - bytes_at_last_speed_calc
+                                    current_speed_bps = (bytes_delta * 8) / time_delta if time_delta > 0 else 0
+                                    progress_data['chunks_status'][part_num]['speed_bps'] = current_speed_bps
+                                    last_speed_calc_time = current_time
+                                    bytes_at_last_speed_calc = bytes_this_chunk
+
+                                # Emit progress signal to the UI via the queue
+                                if emitter and (current_time - global_emit_time_ref[0] > 0.25):
+                                    global_emit_time_ref[0] = current_time
+                                    status_list_copy = [dict(s) for s in progress_data['chunks_status']]
+                                    if isinstance(emitter, queue.Queue):
+                                        emitter.put({'type': 'file_progress', 'payload': (api_original_filename, status_list_copy)})
+                                    elif hasattr(emitter, 'file_progress_signal'):
+                                        emitter.file_progress_signal.emit(api_original_filename, status_list_copy)
+
+                # If we get here, the download for this chunk is successful
+                return bytes_this_chunk, True
+
+            except (requests.exceptions.ConnectionError, requests.exceptions.Timeout, http.client.IncompleteRead) as e:
+                logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Retryable error: {e}")
+            except requests.exceptions.RequestException as e:
+                logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Non-retryable error: {e}")
+                return bytes_this_chunk, False # Break loop on non-retryable errors
+            except Exception as e:
+                logger_func(f"   ❌ [Chunk {part_num + 1}/{total_parts}] Unexpected error: {e}\n{traceback.format_exc(limit=1)}")
+                return bytes_this_chunk, False
+
+        # If the retry loop finishes without a successful download
+        return bytes_this_chunk, False
+    finally:
+        # This block runs whether the download succeeded or failed
+        with progress_data['lock']:
+            progress_data['chunks_status'][part_num]['active'] = False
+            progress_data['chunks_status'][part_num]['speed_bps'] = 0.0
 
 
 def download_file_in_parts(file_url, save_path, total_size, num_parts, headers, api_original_filename,
                            emitter_for_multipart, cookies_for_chunk_session,
                            cancellation_event, skip_event, logger_func, pause_event):
-    logger_func(f"⬇️ Initializing Multi-part Download ({num_parts} parts) for: '{api_original_filename}' (Size: {total_size / (1024*1024):.2f} MB)")
-    temp_file_path = save_path + ".part"
+    """
+    Manages a resilient, multipart file download by saving each chunk to a separate file.
 
-    try:
-        with open(temp_file_path, 'wb') as f_temp:
-            if total_size > 0:
-                f_temp.truncate(total_size)
-    except IOError as e:
-        logger_func(f"   ❌ Error creating/truncating temp file '{temp_file_path}': {e}")
-        return False, 0, None, None
+    This function orchestrates the download process by:
+    1. Checking for already completed chunk files to resume a previous download.
+    2. Submitting only the missing chunks to a thread pool for parallel download.
+    3. Assembling the final file from the individual chunks upon successful completion.
+    4. Cleaning up temporary chunk files after assembly.
+    5. Leaving completed chunks on disk if the download fails, allowing for a future resume.
 
+    Args:
+        file_url (str): The URL of the file to download.
+        save_path (str): The final desired path for the downloaded file (e.g., 'my_video.mp4').
+        total_size (int): The total size of the file in bytes.
+        num_parts (int): The number of parts to split the download into.
+        headers (dict): HTTP headers for the download requests.
+        api_original_filename (str): The original filename for UI progress display.
+        emitter_for_multipart (queue.Queue or QObject): Emitter for UI signals.
+        cookies_for_chunk_session (dict): Cookies for the download requests.
+        cancellation_event (threading.Event): Event to signal cancellation.
+        skip_event (threading.Event): Event to signal skipping the file.
+        logger_func (function): A function for logging messages.
+        pause_event (threading.Event): Event to signal pausing the download.
+
+    Returns:
+        tuple: A tuple containing (success_flag, total_bytes_downloaded, md5_hash, file_handle).
+               The file_handle will be for the final assembled file if successful, otherwise None.
+    """
+    logger_func(f"⬇️ Initializing Resumable Multi-part Download ({num_parts} parts) for: '{api_original_filename}' (Size: {total_size / (1024*1024):.2f} MB)")
+
+    # Calculate the byte range for each chunk
     chunk_size_calc = total_size // num_parts
     chunks_ranges = []
     for i in range(num_parts):
@@ -153,76 +207,119 @@ def download_file_in_parts(file_url, save_path, total_size, num_parts, headers,
         end = start + chunk_size_calc - 1 if i < num_parts - 1 else total_size - 1
         if start <= end:
             chunks_ranges.append((start, end))
-        elif total_size == 0 and i == 0:
+        elif total_size == 0 and i == 0: # Handle zero-byte files
             chunks_ranges.append((0, -1))
 
+    # Calculate the expected size of each chunk
     chunk_actual_sizes = []
     for start, end in chunks_ranges:
-        if end == -1 and start == 0:
-            chunk_actual_sizes.append(0)
-        else:
-            chunk_actual_sizes.append(end - start + 1)
+        chunk_actual_sizes.append(end - start + 1 if end != -1 else 0)
 
     if not chunks_ranges and total_size > 0:
-        logger_func(f"   ⚠️ No valid chunk ranges for multipart download of '{api_original_filename}'. Aborting multipart.")
-        if os.path.exists(temp_file_path): os.remove(temp_file_path)
+        logger_func(f"   ⚠️ No valid chunk ranges for multipart download of '{api_original_filename}'. Aborting.")
         return False, 0, None, None
 
+    # --- Resumption Logic: Check for existing complete chunks ---
+    chunks_to_download = []
+    total_bytes_resumed = 0
+    for i, (start, end) in enumerate(chunks_ranges):
+        chunk_part_path = f"{save_path}.part{i}"
+        expected_chunk_size = chunk_actual_sizes[i]
+
+        if os.path.exists(chunk_part_path) and os.path.getsize(chunk_part_path) == expected_chunk_size:
+            logger_func(f"   [Chunk {i + 1}/{num_parts}] Resuming with existing complete chunk file.")
+            total_bytes_resumed += expected_chunk_size
+        else:
+            chunks_to_download.append({'index': i, 'start': start, 'end': end})
+
+    # Setup the shared progress data structure
     progress_data = {
         'total_file_size': total_size,
-        'total_downloaded_so_far': 0,
-        'chunks_status': [
-            {'id': i, 'downloaded': 0, 'total': chunk_actual_sizes[i] if i < len(chunk_actual_sizes) else 0, 'active': False, 'speed_bps': 0.0}
-            for i in range(num_parts)
-        ],
+        'total_downloaded_so_far': total_bytes_resumed,
+        'chunks_status': [],
         'lock': threading.Lock(),
         'last_global_emit_time': [time.time()]
     }
+    for i in range(num_parts):
+        is_resumed = not any(c['index'] == i for c in chunks_to_download)
+        progress_data['chunks_status'].append({
+            'id': i,
+            'downloaded': chunk_actual_sizes[i] if is_resumed else 0,
+            'total': chunk_actual_sizes[i],
+            'active': False,
+            'speed_bps': 0.0
+        })
 
+    # --- Download Phase ---
     chunk_futures = []
     all_chunks_successful = True
-    total_bytes_from_chunks = 0
+    total_bytes_from_threads = 0
 
     with ThreadPoolExecutor(max_workers=num_parts, thread_name_prefix=f"MPChunk_{api_original_filename[:10]}_") as chunk_pool:
-        for i, (start, end) in enumerate(chunks_ranges):
-            if cancellation_event and cancellation_event.is_set(): all_chunks_successful = False; break
-            chunk_futures.append(chunk_pool.submit(
-                _download_individual_chunk, chunk_url=file_url, temp_file_path=temp_file_path,
+        for chunk_info in chunks_to_download:
+            if cancellation_event and cancellation_event.is_set():
+                all_chunks_successful = False
+                break
+            
+            i, start, end = chunk_info['index'], chunk_info['start'], chunk_info['end']
+            chunk_part_path = f"{save_path}.part{i}"
+            
+            future = chunk_pool.submit(
+                _download_individual_chunk,
+                chunk_url=file_url,
+                chunk_temp_file_path=chunk_part_path,
                 start_byte=start, end_byte=end, headers=headers, part_num=i, total_parts=num_parts,
-                progress_data=progress_data, cancellation_event=cancellation_event, skip_event=skip_event, global_emit_time_ref=progress_data['last_global_emit_time'],
-                pause_event=pause_event, cookies_for_chunk=cookies_for_chunk_session, logger_func=logger_func, emitter=emitter_for_multipart,
+                progress_data=progress_data, cancellation_event=cancellation_event,
+                skip_event=skip_event, global_emit_time_ref=progress_data['last_global_emit_time'],
+                pause_event=pause_event, cookies_for_chunk=cookies_for_chunk_session,
+                logger_func=logger_func, emitter=emitter_for_multipart,
                 api_original_filename=api_original_filename
-            ))
+            )
+            chunk_futures.append(future)
 
         for future in as_completed(chunk_futures):
-            if cancellation_event and cancellation_event.is_set(): all_chunks_successful = False; break
-            bytes_downloaded_this_chunk, success_this_chunk = future.result()
-            total_bytes_from_chunks += bytes_downloaded_this_chunk
-            if not success_this_chunk:
+            if cancellation_event and cancellation_event.is_set():
                 all_chunks_successful = False
+            bytes_downloaded, success = future.result()
+            total_bytes_from_threads += bytes_downloaded
+            if not success:
+                all_chunks_successful = False
+
+    total_bytes_final = total_bytes_resumed + total_bytes_from_threads
 
     if cancellation_event and cancellation_event.is_set():
         logger_func(f"   Multi-part download for '{api_original_filename}' cancelled by main event.")
         all_chunks_successful = False
-    if emitter_for_multipart:
-        with progress_data['lock']:
-            status_list_copy = [dict(s) for s in progress_data['chunks_status']]
-            if isinstance(emitter_for_multipart, queue.Queue):
-                emitter_for_multipart.put({'type': 'file_progress', 'payload': (api_original_filename, status_list_copy)})
-            elif hasattr(emitter_for_multipart, 'file_progress_signal'):
-                emitter_for_multipart.file_progress_signal.emit(api_original_filename, status_list_copy)
 
-    if all_chunks_successful and (total_bytes_from_chunks == total_size or total_size == 0):
-        logger_func(f"   ✅ Multi-part download successful for '{api_original_filename}'. Total bytes: {total_bytes_from_chunks}")
+    # --- Assembly and Cleanup Phase ---
+    if all_chunks_successful and (total_bytes_final == total_size or total_size == 0):
+        logger_func(f"   ✅ All {num_parts} chunks complete. Assembling final file...")
         md5_hasher = hashlib.md5()
-        with open(temp_file_path, 'rb') as f_hash:
-            for buf in iter(lambda: f_hash.read(4096*10), b''):
-                md5_hasher.update(buf)
-        calculated_hash = md5_hasher.hexdigest()
-        return True, total_bytes_from_chunks, calculated_hash, open(temp_file_path, 'rb')
+        try:
+            with open(save_path, 'wb') as final_file:
+                for i in range(num_parts):
+                    chunk_part_path = f"{save_path}.part{i}"
+                    with open(chunk_part_path, 'rb') as chunk_file:
+                        content = chunk_file.read()
+                        final_file.write(content)
+                        md5_hasher.update(content)
+            
+            calculated_hash = md5_hasher.hexdigest()
+            logger_func(f"   ✅ Assembly successful for '{api_original_filename}'. Total bytes: {total_bytes_final}")
+            return True, total_bytes_final, calculated_hash, open(save_path, 'rb')
+        except Exception as e:
+            logger_func(f"   ❌ Critical error during file assembly: {e}. Cleaning up.")
+            return False, total_bytes_final, None, None
+        finally:
+            # Cleanup all individual chunk files after successful assembly
+            for i in range(num_parts):
+                chunk_part_path = f"{save_path}.part{i}"
+                if os.path.exists(chunk_part_path):
+                    try:
+                        os.remove(chunk_part_path)
+                    except OSError as e:
+                        logger_func(f"    ⚠️ Failed to remove temp part file '{chunk_part_path}': {e}")
     else:
-        logger_func(f"   ❌ Multi-part download failed for '{api_original_filename}'. Success: {all_chunks_successful}, Bytes: {total_bytes_from_chunks}/{total_size}. Cleaning up.")
-        if os.path.exists(temp_file_path):
-            try: os.remove(temp_file_path)
-            except OSError as e: logger_func(f"    Failed to remove temp part file '{temp_file_path}': {e}")
-        return False, total_bytes_from_chunks, None, None
+        # If download failed, we do NOT clean up, allowing for resumption later
+        logger_func(f"   ❌ Multi-part download failed for '{api_original_filename}'. Success: {all_chunks_successful}, Bytes: {total_bytes_final}/{total_size}. Partial chunks saved for future resumption.")
+        return False, total_bytes_final, None, None

src/ui/dialogs/EmptyPopupDialog.py

@@ -960,15 +960,16 @@ class EmptyPopupDialog (QDialog ):
 
                 self .parent_app .log_signal .emit (f"ℹ️ Added {num_just_added_posts } selected posts to the download queue. Total in queue: {total_in_queue }.")
 
+                # --- START: MODIFIED LOGIC ---
+                # Removed the blockSignals(True/False) calls to allow the main window's UI to update correctly.
                 if self .parent_app .link_input :
-                    self .parent_app .link_input .blockSignals (True )
                     self .parent_app .link_input .setText (
                     self .parent_app ._tr ("popup_posts_selected_text","Posts - {count} selected").format (count =num_just_added_posts )
                     )
-                    self .parent_app .link_input .blockSignals (False )
                     self .parent_app .link_input .setPlaceholderText (
                     self .parent_app ._tr ("items_in_queue_placeholder","{count} items in queue from popup.").format (count =total_in_queue )
                     )
+                # --- END: MODIFIED LOGIC ---
             
             self.selected_creators_for_queue.clear()
             
@@ -989,9 +990,6 @@ class EmptyPopupDialog (QDialog ):
         self .add_selected_button .setEnabled (True )
         self .setWindowTitle (self ._tr ("creator_popup_title","Creator Selection"))
 
-
-
-
     def _get_domain_for_service (self ,service_name ):
         """Determines the base domain for a given service."""
         service_lower =service_name .lower ()

src/ui/dialogs/FavoriteArtistsDialog.py

@@ -37,13 +37,13 @@ class FavoriteArtistsDialog (QDialog ):
         self ._init_ui ()
         self ._fetch_favorite_artists ()
 
-    def _get_domain_for_service (self ,service_name ):
-        service_lower =service_name .lower ()
-        coomer_primary_services ={'onlyfans','fansly','manyvids','candfans'}
-        if service_lower in coomer_primary_services :
-            return "coomer.su"
-        else :
-            return "kemono.su"
+    def _get_domain_for_service(self, service_name):
+        service_lower = service_name.lower()
+        coomer_primary_services = {'onlyfans', 'fansly', 'manyvids', 'candfans'}
+        if service_lower in coomer_primary_services:
+            return "coomer.st"  # Use the new domain
+        else:
+            return "kemono.cr"   # Use the new domain
 
     def _tr (self ,key ,default_text =""):
         """Helper to get translation based on current app language."""
@@ -128,9 +128,29 @@ class FavoriteArtistsDialog (QDialog ):
     def _fetch_favorite_artists (self ):
 
         if self.cookies_config['use_cookie']:
-            # Check if we can load cookies for at least one of the services.
-            kemono_cookies = prepare_cookies_for_request(True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'], self.cookies_config['app_base_dir'], self._logger, target_domain="kemono.su")
-            coomer_cookies = prepare_cookies_for_request(True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'], self.cookies_config['app_base_dir'], self._logger, target_domain="coomer.su")
+            # --- Kemono Check with Fallback ---
+            kemono_cookies = prepare_cookies_for_request(
+                True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                self.cookies_config['app_base_dir'], self._logger, target_domain="kemono.cr"
+            )
+            if not kemono_cookies:
+                self._logger("No cookies for kemono.cr, trying fallback kemono.su...")
+                kemono_cookies = prepare_cookies_for_request(
+                    True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'], self._logger, target_domain="kemono.su"
+                )
+
+            # --- Coomer Check with Fallback ---
+            coomer_cookies = prepare_cookies_for_request(
+                True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                self.cookies_config['app_base_dir'], self._logger, target_domain="coomer.st"
+            )
+            if not coomer_cookies:
+                self._logger("No cookies for coomer.st, trying fallback coomer.su...")
+                coomer_cookies = prepare_cookies_for_request(
+                    True, self.cookies_config['cookie_text'], self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'], self._logger, target_domain="coomer.su"
+                )
 
             if not kemono_cookies and not coomer_cookies:
                 # If cookies are enabled but none could be loaded, show help and stop.
@@ -139,7 +159,7 @@ class FavoriteArtistsDialog (QDialog ):
                 cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
                 cookie_help_dialog.exec_()
                 self.download_button.setEnabled(False)
-                return # Stop further execution
+                return  # Stop further execution
 
         kemono_fav_url ="https://kemono.su/api/v1/account/favorites?type=artist"
         coomer_fav_url ="https://coomer.su/api/v1/account/favorites?type=artist"
@@ -149,9 +169,12 @@ class FavoriteArtistsDialog (QDialog ):
         errors_occurred =[]
         any_cookies_loaded_successfully_for_any_source =False 
 
-        api_sources =[
-        {"name":"Kemono.su","url":kemono_fav_url ,"domain":"kemono.su"},
-        {"name":"Coomer.su","url":coomer_fav_url ,"domain":"coomer.su"}
+        kemono_cr_fav_url = "https://kemono.cr/api/v1/account/favorites?type=artist"
+        coomer_st_fav_url = "https://coomer.st/api/v1/account/favorites?type=artist"
+
+        api_sources = [
+            {"name": "Kemono.cr", "url": kemono_cr_fav_url, "domain": "kemono.cr"},
+            {"name": "Coomer.st", "url": coomer_st_fav_url, "domain": "coomer.st"}
         ]
 
         for source in api_sources :
@@ -159,20 +182,41 @@ class FavoriteArtistsDialog (QDialog ):
             self .status_label .setText (self ._tr ("fav_artists_loading_from_source_status","⏳ Loading favorites from {source_name}...").format (source_name =source ['name']))
             QCoreApplication .processEvents ()
 
-            cookies_dict_for_source =None 
-            if self .cookies_config ['use_cookie']:
-                cookies_dict_for_source =prepare_cookies_for_request (
-                True ,
-                self .cookies_config ['cookie_text'],
-                self .cookies_config ['selected_cookie_file'],
-                self .cookies_config ['app_base_dir'],
-                self ._logger ,
-                target_domain =source ['domain']
+            cookies_dict_for_source = None
+            if self.cookies_config['use_cookie']:
+                primary_domain = source['domain']
+                fallback_domain = None
+                if primary_domain == "kemono.cr":
+                    fallback_domain = "kemono.su"
+                elif primary_domain == "coomer.st":
+                    fallback_domain = "coomer.su"
+
+                # First, try the primary domain
+                cookies_dict_for_source = prepare_cookies_for_request(
+                    True,
+                    self.cookies_config['cookie_text'],
+                    self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'],
+                    self._logger,
+                    target_domain=primary_domain
                 )
-                if cookies_dict_for_source :
-                    any_cookies_loaded_successfully_for_any_source =True 
-                else :
-                    self ._logger (f"Warning ({source ['name']}): Cookies enabled but could not be loaded for this domain. Fetch might fail if cookies are required.")
+
+                # If no cookies found, try the fallback domain
+                if not cookies_dict_for_source and fallback_domain:
+                    self._logger(f"Warning ({source['name']}): No cookies found for '{primary_domain}'. Trying fallback '{fallback_domain}'...")
+                    cookies_dict_for_source = prepare_cookies_for_request(
+                        True,
+                        self.cookies_config['cookie_text'],
+                        self.cookies_config['selected_cookie_file'],
+                        self.cookies_config['app_base_dir'],
+                        self._logger,
+                        target_domain=fallback_domain
+                    )
+                
+                if cookies_dict_for_source:
+                    any_cookies_loaded_successfully_for_any_source = True
+                else:
+                    self._logger(f"Warning ({source['name']}): Cookies enabled but could not be loaded for this source (including fallbacks). Fetch might fail.")
             try :
                 headers ={'User-Agent':'Mozilla/5.0'}
                 response =requests .get (source ['url'],headers =headers ,cookies =cookies_dict_for_source ,timeout =20 )
@@ -223,7 +267,7 @@ class FavoriteArtistsDialog (QDialog ):
         if self .cookies_config ['use_cookie']and not any_cookies_loaded_successfully_for_any_source :
             self .status_label .setText (self ._tr ("fav_artists_cookies_required_status","Error: Cookies enabled but could not be loaded for any source."))
             self ._logger ("Error: Cookies enabled but no cookies loaded for any source. Showing help dialog.")
-            cookie_help_dialog =CookieHelpDialog (self )
+            cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
             cookie_help_dialog .exec_ ()
             self .download_button .setEnabled (False )
             if not fetched_any_successfully :

src/ui/dialogs/FavoritePostsDialog.py

@@ -34,28 +34,30 @@ class FavoritePostsFetcherThread (QThread ):
         self .target_domain_preference =target_domain_preference 
         self .cancellation_event =threading .Event ()
         self .error_key_map ={
-        "Kemono.su":"kemono_su",
-        "Coomer.su":"coomer_su"
+        "kemono.cr":"kemono_su",
+        "coomer.st":"coomer_su"
         }
 
     def _logger (self ,message ):
         self .parent_logger_func (f"[FavPostsFetcherThread] {message }")
 
-    def run (self ):
-        kemono_fav_posts_url ="https://kemono.su/api/v1/account/favorites?type=post"
-        coomer_fav_posts_url ="https://coomer.su/api/v1/account/favorites?type=post"
+    def run(self):
+        kemono_su_fav_posts_url = "https://kemono.su/api/v1/account/favorites?type=post"
+        coomer_su_fav_posts_url = "https://coomer.su/api/v1/account/favorites?type=post"
+        kemono_cr_fav_posts_url = "https://kemono.cr/api/v1/account/favorites?type=post"
+        coomer_st_fav_posts_url = "https://coomer.st/api/v1/account/favorites?type=post"
 
-        all_fetched_posts_temp =[]
-        error_messages_for_summary =[]
-        fetched_any_successfully =False 
-        any_cookies_loaded_successfully_for_any_source =False 
+        all_fetched_posts_temp = []
+        error_messages_for_summary = []
+        fetched_any_successfully = False
+        any_cookies_loaded_successfully_for_any_source = False
 
-        self .status_update .emit ("key_fetching_fav_post_list_init")
-        self .progress_bar_update .emit (0 ,0 )
+        self.status_update.emit("key_fetching_fav_post_list_init")
+        self.progress_bar_update.emit(0, 0)
 
-        api_sources =[
-        {"name":"Kemono.su","url":kemono_fav_posts_url ,"domain":"kemono.su"},
-        {"name":"Coomer.su","url":coomer_fav_posts_url ,"domain":"coomer.su"}
+        api_sources = [
+            {"name": "Kemono.cr", "url": kemono_cr_fav_posts_url, "domain": "kemono.cr"},
+            {"name": "Coomer.st", "url": coomer_st_fav_posts_url, "domain": "coomer.st"}
         ]
 
         api_sources_to_try =[]
@@ -76,20 +78,41 @@ class FavoritePostsFetcherThread (QThread ):
             if self .cancellation_event .is_set ():
                 self .finished .emit ([],"KEY_FETCH_CANCELLED_DURING")
                 return 
-            cookies_dict_for_source =None 
-            if self .cookies_config ['use_cookie']:
-                cookies_dict_for_source =prepare_cookies_for_request (
-                True ,
-                self .cookies_config ['cookie_text'],
-                self .cookies_config ['selected_cookie_file'],
-                self .cookies_config ['app_base_dir'],
-                self ._logger ,
-                target_domain =source ['domain']
+            cookies_dict_for_source = None
+            if self.cookies_config['use_cookie']:
+                primary_domain = source['domain']
+                fallback_domain = None
+                if primary_domain == "kemono.cr":
+                    fallback_domain = "kemono.su"
+                elif primary_domain == "coomer.st":
+                    fallback_domain = "coomer.su"
+
+                # First, try the primary domain
+                cookies_dict_for_source = prepare_cookies_for_request(
+                    True,
+                    self.cookies_config['cookie_text'],
+                    self.cookies_config['selected_cookie_file'],
+                    self.cookies_config['app_base_dir'],
+                    self._logger,
+                    target_domain=primary_domain
                 )
-                if cookies_dict_for_source :
-                    any_cookies_loaded_successfully_for_any_source =True 
-                else :
-                    self ._logger (f"Warning ({source ['name']}): Cookies enabled but could not be loaded for this domain. Fetch might fail if cookies are required.")
+
+                # If no cookies found, try the fallback domain
+                if not cookies_dict_for_source and fallback_domain:
+                    self._logger(f"Warning ({source['name']}): No cookies found for '{primary_domain}'. Trying fallback '{fallback_domain}'...")
+                    cookies_dict_for_source = prepare_cookies_for_request(
+                        True,
+                        self.cookies_config['cookie_text'],
+                        self.cookies_config['selected_cookie_file'],
+                        self.cookies_config['app_base_dir'],
+                        self._logger,
+                        target_domain=fallback_domain
+                    )
+
+                if cookies_dict_for_source:
+                    any_cookies_loaded_successfully_for_any_source = True
+                else:
+                    self._logger(f"Warning ({source['name']}): Cookies enabled but could not be loaded for this domain. Fetch might fail if cookies are required.")
 
             self ._logger (f"Attempting to fetch favorite posts from: {source ['name']} ({source ['url']})")
             source_key_part =self .error_key_map .get (source ['name'],source ['name'].lower ().replace ('.','_'))
@@ -409,14 +432,14 @@ class FavoritePostsDialog (QDialog ):
             if status_key .startswith ("KEY_COOKIES_REQUIRED_BUT_NOT_FOUND_FOR_DOMAIN_")or status_key =="KEY_COOKIES_REQUIRED_BUT_NOT_FOUND_GENERIC":
                 status_label_text_key ="fav_posts_cookies_required_error"
                 self ._logger (f"Cookie error: {status_key }. Showing help dialog.")
-                cookie_help_dialog =CookieHelpDialog (self )
+                cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
                 cookie_help_dialog .exec_ ()
             elif status_key =="KEY_AUTH_FAILED":
                 status_label_text_key ="fav_posts_auth_failed_title"
                 self ._logger (f"Auth error: {status_key }. Showing help dialog.")
                 QMessageBox .warning (self ,self ._tr ("fav_posts_auth_failed_title","Authorization Failed (Posts)"),
                 self ._tr ("fav_posts_auth_failed_message_generic","...").format (domain_specific_part =specific_domain_msg_part ))
-                cookie_help_dialog =CookieHelpDialog (self )
+                cookie_help_dialog = CookieHelpDialog(self.parent_app, self)
                 cookie_help_dialog .exec_ ()
             elif status_key =="KEY_NO_FAVORITES_FOUND_ALL_PLATFORMS":
                 status_label_text_key ="fav_posts_no_posts_found_status"

src/ui/dialogs/FutureSettingsDialog.py

@@ -15,7 +15,8 @@ from ...utils.resolution import get_dark_theme
 from ..main_window import get_app_icon_object
 from ...config.constants import (
     THEME_KEY, LANGUAGE_KEY, DOWNLOAD_LOCATION_KEY,
-    RESOLUTION_KEY, UI_SCALE_KEY, SAVE_CREATOR_JSON_KEY 
+    RESOLUTION_KEY, UI_SCALE_KEY, SAVE_CREATOR_JSON_KEY,
+    COOKIE_TEXT_KEY, USE_COOKIE_KEY
 )
 
 
@@ -89,7 +90,9 @@ class FutureSettingsDialog(QDialog):
         # Default Path
         self.default_path_label = QLabel()
         self.save_path_button = QPushButton()
-        self.save_path_button.clicked.connect(self._save_download_path)
+        # --- START: MODIFIED LOGIC ---
+        self.save_path_button.clicked.connect(self._save_cookie_and_path)
+        # --- END: MODIFIED LOGIC ---
         download_window_layout.addWidget(self.default_path_label, 1, 0)
         download_window_layout.addWidget(self.save_path_button, 1, 1)
 
@@ -143,11 +146,13 @@ class FutureSettingsDialog(QDialog):
         self.default_path_label.setText(self._tr("default_path_label", "Default Path:"))
         self.save_creator_json_checkbox.setText(self._tr("save_creator_json_label", "Save Creator.json file"))
         
+        # --- START: MODIFIED LOGIC ---
         # Buttons and Controls
         self._update_theme_toggle_button_text()
-        self.save_path_button.setText(self._tr("settings_save_path_button", "Save Current Download Path"))
-        self.save_path_button.setToolTip(self._tr("settings_save_path_tooltip", "Save the current 'Download Location' for future sessions."))
+        self.save_path_button.setText(self._tr("settings_save_cookie_path_button", "Save Cookie + Download Path"))
+        self.save_path_button.setToolTip(self._tr("settings_save_cookie_path_tooltip", "Save the current 'Download Location' and Cookie settings for future sessions."))
         self.ok_button.setText(self._tr("ok_button", "OK"))
+        # --- END: MODIFIED LOGIC ---
 
         # Populate dropdowns
         self._populate_display_combo_boxes()
@@ -275,22 +280,43 @@ class FutureSettingsDialog(QDialog):
             if msg_box.clickedButton() == restart_button:
                 self.parent_app._request_restart_application()
 
-    def _save_download_path(self):
+    def _save_cookie_and_path(self):
+        """Saves the current download path and/or cookie settings from the main window."""
+        path_saved = False
+        cookie_saved = False
+        
+        # --- Save Download Path Logic ---
         if hasattr(self.parent_app, 'dir_input') and self.parent_app.dir_input:
             current_path = self.parent_app.dir_input.text().strip()
             if current_path and os.path.isdir(current_path):
                 self.parent_app.settings.setValue(DOWNLOAD_LOCATION_KEY, current_path)
-                self.parent_app.settings.sync()
-                QMessageBox.information(self,
-                    self._tr("settings_save_path_success_title", "Path Saved"),
-                    self._tr("settings_save_path_success_message", "Download location '{path}' saved.").format(path=current_path))
-            elif not current_path:
-                 QMessageBox.warning(self,
-                    self._tr("settings_save_path_empty_title", "Empty Path"),
-                    self._tr("settings_save_path_empty_message", "Download location cannot be empty."))
-            else:
-                QMessageBox.warning(self,
-                    self._tr("settings_save_path_invalid_title", "Invalid Path"),
-                    self._tr("settings_save_path_invalid_message", "The path '{path}' is not a valid directory.").format(path=current_path))
+                path_saved = True
+        
+        # --- Save Cookie Logic ---
+        if hasattr(self.parent_app, 'use_cookie_checkbox'):
+            use_cookie = self.parent_app.use_cookie_checkbox.isChecked()
+            cookie_content = self.parent_app.cookie_text_input.text().strip()
+            
+            if use_cookie and cookie_content:
+                self.parent_app.settings.setValue(USE_COOKIE_KEY, True)
+                self.parent_app.settings.setValue(COOKIE_TEXT_KEY, cookie_content)
+                cookie_saved = True
+            else: # Also save the 'off' state
+                self.parent_app.settings.setValue(USE_COOKIE_KEY, False)
+                self.parent_app.settings.setValue(COOKIE_TEXT_KEY, "")
+
+        self.parent_app.settings.sync()
+
+        # --- User Feedback ---
+        if path_saved and cookie_saved:
+            message = self._tr("settings_save_both_success", "Download location and cookie settings saved.")
+        elif path_saved:
+            message = self._tr("settings_save_path_only_success", "Download location saved. No cookie settings were active to save.")
+        elif cookie_saved:
+            message = self._tr("settings_save_cookie_only_success", "Cookie settings saved. Download location was not set.")
         else:
-            QMessageBox.critical(self, "Error", "Could not access download path input from main application.")
+            QMessageBox.warning(self, self._tr("settings_save_nothing_title", "Nothing to Save"),
+                                self._tr("settings_save_nothing_message", "The download location is not a valid directory and no cookie was active."))
+            return
+
+        QMessageBox.information(self, self._tr("settings_save_success_title", "Settings Saved"), message)

src/ui/dialogs/HelpGuideDialog.py

@@ -4,7 +4,7 @@ from PyQt5.QtCore import QUrl, QSize, Qt
 from PyQt5.QtGui import QIcon, QDesktopServices
 from PyQt5.QtWidgets import (
     QApplication, QDialog, QHBoxLayout, QLabel, QPushButton, QVBoxLayout,
-    QStackedWidget, QScrollArea, QFrame, QWidget
+    QStackedWidget, QListWidget, QFrame, QWidget, QScrollArea
 )
 from ...i18n.translator import get_translation
 from ..main_window import get_app_icon_object
@@ -46,13 +46,12 @@ class TourStepWidget(QWidget):
         layout.addWidget(scroll_area, 1)
 
 
-class HelpGuideDialog (QDialog ):
-    """A multi-page dialog for displaying the feature guide."""
-    def __init__ (self ,steps_data ,parent_app ,parent =None ):
-        super ().__init__ (parent )
-        self .current_step =0 
-        self .steps_data =steps_data 
-        self .parent_app =parent_app 
+class HelpGuideDialog(QDialog):
+    """A multi-page dialog for displaying the feature guide with a navigation list."""
+    def __init__(self, steps_data, parent_app, parent=None):
+        super().__init__(parent)
+        self.steps_data = steps_data
+        self.parent_app = parent_app
 
         scale = self.parent_app.scale_factor if hasattr(self.parent_app, 'scale_factor') else 1.0
 
@@ -61,7 +60,7 @@ class HelpGuideDialog (QDialog ):
             self.setWindowIcon(app_icon)
 
         self.setModal(True)
-        self.resize(int(650 * scale), int(600 * scale))
+        self.resize(int(800 * scale), int(650 * scale))
 
         dialog_font_size = int(11 * scale)
         
@@ -69,6 +68,7 @@ class HelpGuideDialog (QDialog ):
         if hasattr(self.parent_app, 'current_theme') and self.parent_app.current_theme == "dark":
             current_theme_style = get_dark_theme(scale)
         else:
+            # Basic light theme fallback
             current_theme_style = f"""
                 QDialog {{ background-color: #F0F0F0; border: 1px solid #B0B0B0; }}
                 QLabel {{ color: #1E1E1E; }}
@@ -86,118 +86,107 @@ class HelpGuideDialog (QDialog ):
             """
 
         self.setStyleSheet(current_theme_style)
-        self ._init_ui ()
-        if self .parent_app :
-            self .move (self .parent_app .geometry ().center ()-self .rect ().center ())
+        self._init_ui()
+        if self.parent_app:
+            self.move(self.parent_app.geometry().center() - self.rect().center())
 
-    def _tr (self ,key ,default_text =""):
+    def _tr(self, key, default_text=""):
         """Helper to get translation based on current app language."""
-        if callable (get_translation )and self .parent_app :
-            return get_translation (self .parent_app .current_selected_language ,key ,default_text )
-        return default_text 
+        if callable(get_translation) and self.parent_app:
+            return get_translation(self.parent_app.current_selected_language, key, default_text)
+        return default_text
 
+    def _init_ui(self):
+        main_layout = QVBoxLayout(self)
+        main_layout.setContentsMargins(15, 15, 15, 15)
+        main_layout.setSpacing(10)
 
-    def _init_ui (self ):
-        main_layout =QVBoxLayout (self )
-        main_layout .setContentsMargins (0 ,0 ,0 ,0 )
-        main_layout .setSpacing (0 )
+        # Title
+        title_label = QLabel(self._tr("help_guide_dialog_title", "Kemono Downloader - Feature Guide"))
+        scale = getattr(self.parent_app, 'scale_factor', 1.0)
+        title_font_size = int(16 * scale)
+        title_label.setStyleSheet(f"font-size: {title_font_size}pt; font-weight: bold; color: #E0E0E0;")
+        title_label.setAlignment(Qt.AlignCenter)
+        main_layout.addWidget(title_label)
 
-        self .stacked_widget =QStackedWidget ()
-        main_layout .addWidget (self .stacked_widget ,1 )
+        # Content Layout (Navigation + Stacked Pages)
+        content_layout = QHBoxLayout()
+        main_layout.addLayout(content_layout, 1)
 
-        self .tour_steps_widgets =[]
-        scale = self.parent_app.scale_factor if hasattr(self.parent_app, 'scale_factor') else 1.0
-        for title, content in self.steps_data:
-            step_widget = TourStepWidget(title, content, scale=scale) 
-            self.tour_steps_widgets.append(step_widget)
+        self.nav_list = QListWidget()
+        self.nav_list.setFixedWidth(int(220 * scale))
+        self.nav_list.setStyleSheet(f"""
+            QListWidget {{
+                background-color: #2E2E2E;
+                border: 1px solid #4A4A4A;
+                border-radius: 4px;
+                font-size: {int(11 * scale)}pt;
+            }}
+            QListWidget::item {{
+                padding: 10px;
+                border-bottom: 1px solid #4A4A4A;
+            }}
+            QListWidget::item:selected {{
+                background-color: #87CEEB;
+                color: #2E2E2E;
+                font-weight: bold;
+            }}
+        """)
+        content_layout.addWidget(self.nav_list)
+
+        self.stacked_widget = QStackedWidget()
+        content_layout.addWidget(self.stacked_widget)
+
+        for title_key, content_key in self.steps_data:
+            title = self._tr(title_key, title_key)
+            content = self._tr(content_key, f"Content for {content_key} not found.")
+            
+            self.nav_list.addItem(title)
+            
+            step_widget = TourStepWidget(title, content, scale=scale)
             self.stacked_widget.addWidget(step_widget)
 
-        self .setWindowTitle (self ._tr ("help_guide_dialog_title","Kemono Downloader - Feature Guide"))
+        self.nav_list.currentRowChanged.connect(self.stacked_widget.setCurrentIndex)
+        if self.nav_list.count() > 0:
+            self.nav_list.setCurrentRow(0)
 
-        buttons_layout =QHBoxLayout ()
-        buttons_layout .setContentsMargins (15 ,10 ,15 ,15 )
-        buttons_layout .setSpacing (10 )
+        # Footer Layout (Social links and Close button)
+        footer_layout = QHBoxLayout()
+        footer_layout.setContentsMargins(0, 10, 0, 0)
+        
+        # Social Media Icons
+        if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
+            assets_base_dir = sys._MEIPASS
+        else:
+            assets_base_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..', '..'))
 
-        self .back_button =QPushButton (self ._tr ("tour_dialog_back_button","Back"))
-        self .back_button .clicked .connect (self ._previous_step )
-        self .back_button .setEnabled (False )
+        github_icon_path = os.path.join(assets_base_dir, "assets", "github.png")
+        instagram_icon_path = os.path.join(assets_base_dir, "assets", "instagram.png")
+        discord_icon_path = os.path.join(assets_base_dir, "assets", "discord.png")
 
-        if getattr (sys ,'frozen',False )and hasattr (sys ,'_MEIPASS'):
-            assets_base_dir =sys ._MEIPASS 
-        else :
-            assets_base_dir =os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..', '..'))
+        self.github_button = QPushButton(QIcon(github_icon_path), "")
+        self.instagram_button = QPushButton(QIcon(instagram_icon_path), "")
+        self.discord_button = QPushButton(QIcon(discord_icon_path), "")
 
-        github_icon_path =os .path .join (assets_base_dir ,"assets","github.png")
-        instagram_icon_path =os .path .join (assets_base_dir ,"assets","instagram.png")
-        discord_icon_path =os .path .join (assets_base_dir ,"assets","discord.png")
-
-        self .github_button =QPushButton (QIcon (github_icon_path ),"")
-        self .instagram_button =QPushButton (QIcon (instagram_icon_path ),"")
-        self .Discord_button =QPushButton (QIcon (discord_icon_path ),"")
-
-        scale = self.parent_app.scale_factor if hasattr(self.parent_app, 'scale_factor') else 1.0
         icon_dim = int(24 * scale)
         icon_size = QSize(icon_dim, icon_dim)
-        self .github_button .setIconSize (icon_size )
-        self .instagram_button .setIconSize (icon_size )
-        self .Discord_button .setIconSize (icon_size )
+        
+        for button, tooltip_key, url in [
+            (self.github_button, "help_guide_github_tooltip", "https://github.com/Yuvi9587"),
+            (self.instagram_button, "help_guide_instagram_tooltip", "https://www.instagram.com/uvi.arts/"),
+            (self.discord_button, "help_guide_discord_tooltip", "https://discord.gg/BqP64XTdJN")
+        ]:
+            button.setIconSize(icon_size)
+            button.setToolTip(self._tr(tooltip_key))
+            button.setFixedSize(icon_size.width() + 8, icon_size.height() + 8)
+            button.setStyleSheet("background-color: transparent; border: none;")
+            button.clicked.connect(lambda _, u=url: QDesktopServices.openUrl(QUrl(u)))
+            footer_layout.addWidget(button)
 
-        self .next_button =QPushButton (self ._tr ("tour_dialog_next_button","Next"))
-        self .next_button .clicked .connect (self ._next_step_action )
-        self .next_button .setDefault (True )
-        self .github_button .clicked .connect (self ._open_github_link )
-        self .instagram_button .clicked .connect (self ._open_instagram_link )
-        self .Discord_button .clicked .connect (self ._open_Discord_link )
-        self .github_button .setToolTip (self ._tr ("help_guide_github_tooltip","Visit project's GitHub page (Opens in browser)"))
-        self .instagram_button .setToolTip (self ._tr ("help_guide_instagram_tooltip","Visit our Instagram page (Opens in browser)"))
-        self .Discord_button .setToolTip (self ._tr ("help_guide_discord_tooltip","Visit our Discord community (Opens in browser)"))
+        footer_layout.addStretch(1)
 
+        self.finish_button = QPushButton(self._tr("tour_dialog_finish_button", "Finish"))
+        self.finish_button.clicked.connect(self.accept)
+        footer_layout.addWidget(self.finish_button)
 
-        social_layout =QHBoxLayout ()
-        social_layout .setSpacing (10 )
-        social_layout .addWidget (self .github_button )
-        social_layout .addWidget (self .instagram_button )
-        social_layout .addWidget (self .Discord_button )
-
-        while buttons_layout .count ():
-            item =buttons_layout .takeAt (0 )
-            if item .widget ():
-                item .widget ().setParent (None )
-            elif item .layout ():
-                pass 
-        buttons_layout .addLayout (social_layout )
-        buttons_layout .addStretch (1 )
-        buttons_layout .addWidget (self .back_button )
-        buttons_layout .addWidget (self .next_button )
-        main_layout .addLayout (buttons_layout )
-        self ._update_button_states ()
-
-    def _next_step_action (self ):
-        if self .current_step <len (self .tour_steps_widgets )-1 :
-            self .current_step +=1 
-            self .stacked_widget .setCurrentIndex (self .current_step )
-        else :
-            self .accept ()
-        self ._update_button_states ()
-
-    def _previous_step (self ):
-        if self .current_step >0 :
-            self .current_step -=1 
-            self .stacked_widget .setCurrentIndex (self .current_step )
-        self ._update_button_states ()
-
-    def _update_button_states (self ):
-        if self .current_step ==len (self .tour_steps_widgets )-1 :
-            self .next_button .setText (self ._tr ("tour_dialog_finish_button","Finish"))
-        else :
-            self .next_button .setText (self ._tr ("tour_dialog_next_button","Next"))
-        self .back_button .setEnabled (self .current_step >0 )
-
-    def _open_github_link (self ):
-        QDesktopServices .openUrl (QUrl ("https://github.com/Yuvi9587"))
-
-    def _open_instagram_link (self ):
-        QDesktopServices .openUrl (QUrl ("https://www.instagram.com/uvi.arts/"))
-
-    def _open_Discord_link (self ):
-        QDesktopServices .openUrl (QUrl ("https://discord.gg/BqP64XTdJN"))
+        main_layout.addLayout(footer_layout)

src/ui/dialogs/MoreOptionsDialog.py

@@ -24,7 +24,7 @@ class MoreOptionsDialog(QDialog):
         layout.addWidget(self.description_label)
         self.radio_button_group = QButtonGroup(self)
         self.radio_content = QRadioButton("Description/Content")
-        self.radio_comments = QRadioButton("Comments (Not Working)")
+        self.radio_comments = QRadioButton("Comments")
         self.radio_button_group.addButton(self.radio_content)
         self.radio_button_group.addButton(self.radio_comments)
         layout.addWidget(self.radio_content)

src/ui/dialogs/MultipartScopeDialog.py

@@ -0,0 +1,118 @@
+# multipart_scope_dialog.py
+from PyQt5.QtWidgets import (
+    QDialog, QVBoxLayout, QGroupBox, QRadioButton, QDialogButtonBox, QButtonGroup,
+    QLabel, QLineEdit, QHBoxLayout, QFrame
+)
+from PyQt5.QtGui import QIntValidator
+from PyQt5.QtCore import Qt
+
+# It's good practice to get this constant from the source
+# but for this example, we will define it here.
+MAX_PARTS = 16 
+
+class MultipartScopeDialog(QDialog):
+    """
+    A dialog to let the user select the scope, number of parts, and minimum size for multipart downloads.
+    """
+    SCOPE_VIDEOS = 'videos'
+    SCOPE_ARCHIVES = 'archives'
+    SCOPE_BOTH = 'both'
+
+    def __init__(self, current_scope='both', current_parts=4, current_min_size_mb=100, parent=None):
+        super().__init__(parent)
+        self.setWindowTitle("Multipart Download Options")
+        self.setWindowFlags(self.windowFlags() & ~Qt.WindowContextHelpButtonHint)
+        self.setMinimumWidth(350)
+
+        # Main Layout
+        layout = QVBoxLayout(self)
+
+        # --- Options Group for Scope ---
+        self.options_group_box = QGroupBox("Apply multipart downloads to:")
+        options_layout = QVBoxLayout()
+        # ... (Radio buttons and button group code remains unchanged) ...
+        self.radio_videos = QRadioButton("Videos Only")
+        self.radio_archives = QRadioButton("Archives Only (.zip, .rar, etc.)")
+        self.radio_both = QRadioButton("Both Videos and Archives")
+
+        if current_scope == self.SCOPE_VIDEOS:
+            self.radio_videos.setChecked(True)
+        elif current_scope == self.SCOPE_ARCHIVES:
+            self.radio_archives.setChecked(True)
+        else:
+            self.radio_both.setChecked(True)
+
+        self.button_group = QButtonGroup(self)
+        self.button_group.addButton(self.radio_videos)
+        self.button_group.addButton(self.radio_archives)
+        self.button_group.addButton(self.radio_both)
+
+        options_layout.addWidget(self.radio_videos)
+        options_layout.addWidget(self.radio_archives)
+        options_layout.addWidget(self.radio_both)
+        self.options_group_box.setLayout(options_layout)
+        layout.addWidget(self.options_group_box)
+
+        # --- START: MODIFIED Download Settings Group ---
+        self.settings_group_box = QGroupBox("Download settings:")
+        settings_layout = QVBoxLayout()
+
+        # Layout for Parts count
+        parts_layout = QHBoxLayout()
+        self.parts_label = QLabel("Number of download parts per file:")
+        self.parts_input = QLineEdit(str(current_parts))
+        self.parts_input.setValidator(QIntValidator(2, MAX_PARTS, self))
+        self.parts_input.setFixedWidth(40)
+        self.parts_input.setToolTip(f"Set the number of concurrent connections per file (2-{MAX_PARTS}).")
+        parts_layout.addWidget(self.parts_label)
+        parts_layout.addStretch()
+        parts_layout.addWidget(self.parts_input)
+        settings_layout.addLayout(parts_layout)
+
+        # Layout for Minimum Size
+        size_layout = QHBoxLayout()
+        self.size_label = QLabel("Minimum file size for multipart (MB):")
+        self.size_input = QLineEdit(str(current_min_size_mb))
+        self.size_input.setValidator(QIntValidator(10, 10000, self)) # Min 10MB, Max ~10GB
+        self.size_input.setFixedWidth(40)
+        self.size_input.setToolTip("Files smaller than this will use a normal, single-part download.")
+        size_layout.addWidget(self.size_label)
+        size_layout.addStretch()
+        size_layout.addWidget(self.size_input)
+        settings_layout.addLayout(size_layout)
+
+        self.settings_group_box.setLayout(settings_layout)
+        layout.addWidget(self.settings_group_box)
+        # --- END: MODIFIED Download Settings Group ---
+
+        # OK and Cancel Buttons
+        self.button_box = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
+        self.button_box.accepted.connect(self.accept)
+        self.button_box.rejected.connect(self.reject)
+        layout.addWidget(self.button_box)
+
+        self.setLayout(layout)
+
+    def get_selected_scope(self):
+        # ... (This method remains unchanged) ...
+        if self.radio_videos.isChecked():
+            return self.SCOPE_VIDEOS
+        if self.radio_archives.isChecked():
+            return self.SCOPE_ARCHIVES
+        return self.SCOPE_BOTH
+
+    def get_selected_parts(self):
+        # ... (This method remains unchanged) ...
+        try:
+            parts = int(self.parts_input.text())
+            return max(2, min(parts, MAX_PARTS))
+        except (ValueError, TypeError):
+            return 4
+
+    def get_selected_min_size(self):
+        """Returns the selected minimum size in MB as an integer."""
+        try:
+            size = int(self.size_input.text())
+            return max(10, min(size, 10000)) # Enforce valid range
+        except (ValueError, TypeError):
+            return 100 # Return a safe default

src/ui/dialogs/SinglePDF.py

@@ -3,8 +3,27 @@ import re
 try:
     from fpdf import FPDF
     FPDF_AVAILABLE = True
+
+    # --- FIX: Move the class definition inside the try block ---
+    class PDF(FPDF):
+        """Custom PDF class to handle headers and footers."""
+        def header(self):
+            pass 
+
+        def footer(self):
+            self.set_y(-15)
+            if self.font_family:
+                 self.set_font(self.font_family, '', 8)
+            else:
+                 self.set_font('Arial', '', 8)
+            self.cell(0, 10, 'Page ' + str(self.page_no()), 0, 0, 'C')
+
 except ImportError:
     FPDF_AVAILABLE = False
+    # If the import fails, FPDF and PDF will not be defined,
+    # but the program won't crash here.
+    FPDF = None 
+    PDF = None
 
 def strip_html_tags(text):
     if not text:
@@ -12,19 +31,6 @@ def strip_html_tags(text):
     clean = re.compile('<.*?>')
     return re.sub(clean, '', text)
 
-class PDF(FPDF):
-    """Custom PDF class to handle headers and footers."""
-    def header(self):
-        pass 
-
-    def footer(self):
-        self.set_y(-15)
-        if self.font_family:
-             self.set_font(self.font_family, '', 8)
-        else:
-             self.set_font('Arial', '', 8)
-        self.cell(0, 10, 'Page ' + str(self.page_no()), 0, 0, 'C')
-
 def create_single_pdf_from_content(posts_data, output_filename, font_path, logger=print):
     """
     Creates a single, continuous PDF, correctly formatting both descriptions and comments.
@@ -68,7 +74,7 @@ def create_single_pdf_from_content(posts_data, output_filename, font_path, logge
                 pdf.ln(10)
 
         pdf.set_font(default_font_family, 'B', 16)
-        pdf.multi_cell(w=0, h=10, text=post.get('title', 'Untitled Post'), align='L')
+        pdf.multi_cell(w=0, h=10, txt=post.get('title', 'Untitled Post'), align='L')
         pdf.ln(5)
 
         if 'comments' in post and post['comments']:
@@ -89,7 +95,7 @@ def create_single_pdf_from_content(posts_data, output_filename, font_path, logge
                 pdf.ln(10)
 
                 pdf.set_font(default_font_family, '', 11)
-                pdf.multi_cell(0, 7, body)
+                pdf.multi_cell(w=0, h=7, txt=body)
                 
                 if comment_index < len(comments_list) - 1:
                     pdf.ln(3)
@@ -97,7 +103,7 @@ def create_single_pdf_from_content(posts_data, output_filename, font_path, logge
                     pdf.ln(3)
         elif 'content' in post:
             pdf.set_font(default_font_family, '', 12)
-            pdf.multi_cell(w=0, h=7, text=post.get('content', 'No Content'))
+            pdf.multi_cell(w=0, h=7, txt=post.get('content', 'No Content'))
     
     try:
         pdf.output(output_filename)
@@ -105,4 +111,4 @@ def create_single_pdf_from_content(posts_data, output_filename, font_path, logge
         return True
     except Exception as e:
         logger(f"❌ A critical error occurred while saving the final PDF: {e}")
-        return False
+        return False

src/ui/main_window.py

@@ -58,6 +58,7 @@ from .dialogs.MoreOptionsDialog import MoreOptionsDialog
 from .dialogs.SinglePDF import create_single_pdf_from_content
 from .dialogs.SupportDialog import SupportDialog
 from .dialogs.KeepDuplicatesDialog import KeepDuplicatesDialog
+from .dialogs.MultipartScopeDialog import MultipartScopeDialog
 
 class DynamicFilterHolder:
     """A thread-safe class to hold and update character filters during a download."""
@@ -105,6 +106,7 @@ class DownloaderApp (QWidget ):
         self.active_update_profile = None
         self.new_posts_for_update = []
         self.is_finishing = False 
+        self.finish_lock = threading.Lock() 
 
         saved_res = self.settings.value(RESOLUTION_KEY, "Auto")
         if saved_res != "Auto":
@@ -221,6 +223,9 @@ class DownloaderApp (QWidget ):
         self.only_links_log_display_mode = LOG_DISPLAY_LINKS
         self.mega_download_log_preserved_once = False
         self.allow_multipart_download_setting = False
+        self.multipart_scope = 'both'
+        self.multipart_parts_count = 4     
+        self.multipart_min_size_mb = 100 
         self.use_cookie_setting = False
         self.scan_content_images_setting = self.settings.value(SCAN_CONTENT_IMAGES_KEY, False, type=bool)
         self.cookie_text_setting = ""
@@ -235,7 +240,8 @@ class DownloaderApp (QWidget ):
         self.session_temp_files = []
         self.single_pdf_mode = False
         self.save_creator_json_enabled_this_session = True 
-        
+        self.is_single_post_session = False 
+
         print(f"ℹ️ Known.txt will be loaded/saved at: {self.config_file}")
 
         try:
@@ -266,7 +272,7 @@ class DownloaderApp (QWidget ):
         self.download_location_label_widget = None
         self.remove_from_filename_label_widget = None
         self.skip_words_label_widget = None
-        self.setWindowTitle("Kemono Downloader v6.2.0")
+        self.setWindowTitle("Kemono Downloader v6.3.0")
         setup_ui(self)
         self._connect_signals()
         self.log_signal.emit("ℹ️ Local API server functionality has been removed.")
@@ -284,6 +290,7 @@ class DownloaderApp (QWidget ):
         self._retranslate_main_ui()
         self._load_persistent_history()
         self._load_saved_download_location()
+        self._load_saved_cookie_settings() 
         self._update_button_states_and_connections()
         self._check_for_interrupted_session()
 
@@ -1570,6 +1577,31 @@ class DownloaderApp (QWidget ):
             QMessageBox .critical (self ,"Dialog Error",f"An unexpected error occurred with the folder selection dialog: {e }")
 
     def handle_main_log(self, message):
+        if isinstance(message, str) and message.startswith("MANGA_FETCH_PROGRESS:"):
+            try:
+                parts = message.split(":")
+                fetched_count = int(parts[1])
+                page_num = int(parts[2])
+                self.progress_label.setText(self._tr("progress_fetching_manga_pages", "Progress: Fetching Page {page} ({count} posts found)...").format(page=page_num, count=fetched_count))
+                QCoreApplication.processEvents() 
+            except (ValueError, IndexError):
+                try:
+                    fetched_count = int(message.split(":")[1])
+                    self.progress_label.setText(self._tr("progress_fetching_manga_posts", "Progress: Fetching Manga Posts ({count})...").format(count=fetched_count))
+                    QCoreApplication.processEvents()
+                except (ValueError, IndexError):
+                    pass 
+            return 
+        elif isinstance(message, str) and message.startswith("MANGA_FETCH_COMPLETE:"):
+            try:
+                total_posts = int(message.split(":")[1])
+                self.total_posts_to_process = total_posts
+                self.processed_posts_count = 0
+                self.update_progress_display(self.total_posts_to_process, self.processed_posts_count)
+            except (ValueError, IndexError):
+                pass
+            return 
+
         if message.startswith("TEMP_FILE_PATH:"):
             filepath = message.split(":", 1)[1]
             if self.single_pdf_setting:
@@ -2561,23 +2593,42 @@ class DownloaderApp (QWidget ):
             self .manga_rename_toggle_button .setToolTip ("Click to cycle Manga Filename Style (when Manga Mode is active for a creator feed).")
 
     def _toggle_manga_filename_style (self ):
-        current_style =self .manga_filename_style 
-        new_style =""
-        if current_style ==STYLE_POST_TITLE :
-            new_style =STYLE_ORIGINAL_NAME 
-        elif current_style ==STYLE_ORIGINAL_NAME :
-            new_style =STYLE_DATE_POST_TITLE 
-        elif current_style ==STYLE_DATE_POST_TITLE :
-            new_style =STYLE_POST_TITLE_GLOBAL_NUMBERING 
-        elif current_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING :
-            new_style =STYLE_DATE_BASED 
-        elif current_style ==STYLE_DATE_BASED :
-            new_style =STYLE_POST_ID # Change this line
-        elif current_style ==STYLE_POST_ID: # Add this block
-            new_style =STYLE_POST_TITLE
-        else :
-            self .log_signal .emit (f"⚠️ Unknown current manga filename style: {current_style }. Resetting to default ('{STYLE_POST_TITLE }').")
-            new_style =STYLE_POST_TITLE 
+        url_text = self.link_input.text().strip() if self.link_input else ""
+        _, _, post_id = extract_post_info(url_text)
+        is_single_post = bool(post_id)
+
+        current_style = self.manga_filename_style
+        new_style = ""
+
+        if is_single_post:
+            # Cycle through a limited set of styles suitable for single posts
+            if current_style == STYLE_POST_TITLE:
+                new_style = STYLE_DATE_POST_TITLE
+            elif current_style == STYLE_DATE_POST_TITLE:
+                new_style = STYLE_ORIGINAL_NAME
+            elif current_style == STYLE_ORIGINAL_NAME:
+                new_style = STYLE_POST_ID
+            elif current_style == STYLE_POST_ID:
+                new_style = STYLE_POST_TITLE
+            else: # Fallback for any other style
+                new_style = STYLE_POST_TITLE
+        else:
+            # Original cycling logic for creator feeds
+            if current_style ==STYLE_POST_TITLE :
+                new_style =STYLE_ORIGINAL_NAME 
+            elif current_style ==STYLE_ORIGINAL_NAME :
+                new_style =STYLE_DATE_POST_TITLE 
+            elif current_style ==STYLE_DATE_POST_TITLE :
+                new_style =STYLE_POST_TITLE_GLOBAL_NUMBERING 
+            elif current_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING :
+                new_style =STYLE_DATE_BASED 
+            elif current_style ==STYLE_DATE_BASED :
+                new_style =STYLE_POST_ID 
+            elif current_style ==STYLE_POST_ID: 
+                new_style =STYLE_POST_TITLE
+            else :
+                self .log_signal .emit (f"⚠️ Unknown current manga filename style: {current_style }. Resetting to default ('{STYLE_POST_TITLE }').")
+                new_style =STYLE_POST_TITLE 
 
         self .manga_filename_style =new_style 
         self .settings .setValue (MANGA_FILENAME_STYLE_KEY ,self .manga_filename_style )
@@ -2644,15 +2695,26 @@ class DownloaderApp (QWidget ):
         _ ,_ ,post_id =extract_post_info (url_text )
 
         is_creator_feed =not post_id if url_text else False 
+        is_single_post = bool(post_id)
         is_favorite_mode_on =self .favorite_mode_checkbox .isChecked ()if self .favorite_mode_checkbox else False 
 
+        if self.favorite_download_queue and all(item.get('type') == 'single_post_from_popup' for item in self.favorite_download_queue):
+            is_single_post = True
+
+        can_enable_manga_checkbox = (is_creator_feed or is_single_post) and not is_favorite_mode_on
+        
         if self .manga_mode_checkbox :
-            self .manga_mode_checkbox .setEnabled (is_creator_feed and not is_favorite_mode_on )
-            if not is_creator_feed and self .manga_mode_checkbox .isChecked ():
+            self .manga_mode_checkbox .setEnabled (can_enable_manga_checkbox)
+            if not can_enable_manga_checkbox and self .manga_mode_checkbox .isChecked ():
                 self .manga_mode_checkbox .setChecked (False )
                 checked =self .manga_mode_checkbox .isChecked ()
 
-        manga_mode_effectively_on =is_creator_feed and checked 
+        manga_mode_effectively_on = can_enable_manga_checkbox and checked
+
+        sequential_styles = [STYLE_DATE_BASED, STYLE_POST_TITLE_GLOBAL_NUMBERING]
+        if is_single_post and self.manga_filename_style in sequential_styles:
+            self.manga_filename_style = STYLE_POST_TITLE 
+            self._update_manga_filename_style_button_text()
 
         if self .manga_rename_toggle_button :
             self .manga_rename_toggle_button .setVisible (manga_mode_effectively_on and not (is_only_links_mode or is_only_archives_mode or is_only_audio_mode ))
@@ -2686,11 +2748,9 @@ class DownloaderApp (QWidget ):
                 self .manga_date_prefix_input .setMaximumWidth (16777215 )
                 self .manga_date_prefix_input .setMinimumWidth (0 )
 
-        if hasattr (self ,'multipart_toggle_button'):
-
-            hide_multipart_button_due_mode =is_only_links_mode or is_only_archives_mode or is_only_audio_mode 
-            hide_multipart_button_due_manga_mode =manga_mode_effectively_on 
-            self .multipart_toggle_button .setVisible (not (hide_multipart_button_due_mode or hide_multipart_button_due_manga_mode ))
+        if hasattr(self, 'multipart_toggle_button'):
+            hide_multipart_button_due_mode = is_only_links_mode or is_only_archives_mode or is_only_audio_mode
+            self.multipart_toggle_button.setVisible(not hide_multipart_button_due_mode)
 
         self ._update_multithreading_for_date_mode ()
 
@@ -2762,7 +2822,9 @@ class DownloaderApp (QWidget ):
         if total_posts >0 or processed_posts >0 :
             self .file_progress_label .setText ("")
 
-    def start_download(self, direct_api_url=None, override_output_dir=None, is_restore=False, is_continuation=False):
+    def start_download(self, direct_api_url=None, override_output_dir=None, is_restore=False, is_continuation=False, item_type_from_queue=None):
+        self.finish_lock = threading.Lock() 
+        self.is_finishing = False                  
         if self.active_update_profile:
             if not self.new_posts_for_update:
                 return self._check_for_updates()
@@ -2888,46 +2950,67 @@ class DownloaderApp (QWidget ):
         self.cancellation_message_logged_this_session = False
         
         service, user_id, post_id_from_url = extract_post_info(api_url)
+
+        if direct_api_url and not post_id_from_url and item_type_from_queue and 'post' in item_type_from_queue:
+            self.log_signal.emit(f"❌ CRITICAL ERROR: Could not parse post ID from the queued POST URL: {api_url}")
+            self.log_signal.emit("   Skipping this item. This might be due to an unsupported URL format or a temporary issue.")
+            self.download_finished(
+                total_downloaded=0, 
+                total_skipped=1, 
+                cancelled_by_user=False, 
+                kept_original_names_list=[]
+            )
+            return False
+
         if not service or not user_id:
             QMessageBox.critical(self, "Input Error", "Invalid or unsupported URL format.")
             return False
 
-        # Read the setting at the start of the download
         self.save_creator_json_enabled_this_session = self.settings.value(SAVE_CREATOR_JSON_KEY, True, type=bool)
+        self.is_single_post_session = bool(post_id_from_url) 
 
-        profile_processed_ids = set() # Default to an empty set
-                        
-        if self.save_creator_json_enabled_this_session:
-            # --- CREATOR PROFILE LOGIC ---
-            creator_name_for_profile = None
-            if self.is_processing_favorites_queue and self.current_processing_favorite_item_info:
-                creator_name_for_profile = self.current_processing_favorite_item_info.get('name_for_folder')
-            else:
-                creator_key = (service.lower(), str(user_id))
-                creator_name_for_profile = self.creator_name_cache.get(creator_key)
+        if not self.is_single_post_session:
+            self.save_creator_json_enabled_this_session = self.settings.value(SAVE_CREATOR_JSON_KEY, True, type=bool)
 
-            if not creator_name_for_profile:
-                creator_name_for_profile = f"{service}_{user_id}"
-                self.log_signal.emit(f"⚠️ Creator name not in cache. Using '{creator_name_for_profile}' for profile file.")
+            creator_profile_data = {}
+            if self.save_creator_json_enabled_this_session:
+                creator_name_for_profile = None
+                if self.is_processing_favorites_queue and self.current_processing_favorite_item_info:
+                    creator_name_for_profile = self.current_processing_favorite_item_info.get('name_for_folder')
+                else:
+                    creator_key = (service.lower(), str(user_id))
+                    creator_name_for_profile = self.creator_name_cache.get(creator_key)
 
-            creator_profile_data = self._setup_creator_profile(creator_name_for_profile, self.session_file_path)
+                if not creator_name_for_profile:
+                    creator_name_for_profile = f"{service}_{user_id}"
+                    self.log_signal.emit(f"⚠️ Creator name not in cache. Using '{creator_name_for_profile}' for profile file.")
+
+                creator_profile_data = self._setup_creator_profile(creator_name_for_profile, self.session_file_path)
+            
+                current_settings = self._get_current_ui_settings_as_dict(api_url_override=api_url, output_dir_override=effective_output_dir_for_run)
+                creator_profile_data['settings'] = current_settings
+            
+                creator_profile_data.setdefault('creator_url', [])
+                if api_url not in creator_profile_data['creator_url']:
+                    creator_profile_data['creator_url'].append(api_url)
+
+                if self.active_update_profile:
+                    self.log_signal.emit("   Update session active: Loading existing processed post IDs to find new content.")
+                    profile_processed_ids = set(creator_profile_data.get('processed_post_ids', []))
+                
+                elif not is_restore:
+                    self.log_signal.emit("   Fresh download session: Clearing previous post history for this creator to re-download all.")
+                    if 'processed_post_ids' in creator_profile_data:
+                        creator_profile_data['processed_post_ids'] = []
+
+                creator_profile_data.setdefault('processed_post_ids', [])
+                self._save_creator_profile(creator_name_for_profile, creator_profile_data, self.session_file_path)
+                self.log_signal.emit(f"✅ Profile for '{creator_name_for_profile}' loaded/created. Settings saved.")
         
-        # Get all current UI settings and add them to the profile
-            current_settings = self._get_current_ui_settings_as_dict(api_url_override=api_url, output_dir_override=effective_output_dir_for_run)
-            creator_profile_data['settings'] = current_settings
-        
-            creator_profile_data.setdefault('creator_url', [])
-            if api_url not in creator_profile_data['creator_url']:
-                creator_profile_data['creator_url'].append(api_url)
+        profile_processed_ids = set()
 
-            creator_profile_data.setdefault('processed_post_ids', [])
-            self._save_creator_profile(creator_name_for_profile, creator_profile_data, self.session_file_path)
-            self.log_signal.emit(f"✅ Profile for '{creator_name_for_profile}' loaded/created. Settings saved.")
         
-            profile_processed_ids = set(creator_profile_data.get('processed_post_ids', []))
-            # --- END OF PROFILE LOGIC ---
 
-        # The rest of this logic runs regardless, but uses the profile data if it was loaded
         session_processed_ids = set(processed_post_ids_for_restore)
         combined_processed_ids = session_processed_ids.union(profile_processed_ids)
         processed_post_ids_for_this_run = list(combined_processed_ids)
@@ -3055,7 +3138,7 @@ class DownloaderApp (QWidget ):
         elif backend_filter_mode == 'audio': current_mode_log_text = "Audio Download"
 
         current_char_filter_scope = self.get_char_filter_scope()
-        manga_mode = manga_mode_is_checked and not post_id_from_url
+        manga_mode = manga_mode_is_checked
 
         manga_date_prefix_text = ""
         if manga_mode and (self.manga_filename_style == STYLE_DATE_BASED or self.manga_filename_style == STYLE_ORIGINAL_NAME) and hasattr(self, 'manga_date_prefix_input'):
@@ -3370,6 +3453,9 @@ class DownloaderApp (QWidget ):
             'num_file_threads_for_worker': effective_num_file_threads_per_worker,
             'manga_date_file_counter_ref': manga_date_file_counter_ref_for_thread,
             'allow_multipart_download': allow_multipart,
+            'multipart_scope': self.multipart_scope,
+            'multipart_parts_count': self.multipart_parts_count,
+            'multipart_min_size_mb': self.multipart_min_size_mb,
             'cookie_text': cookie_text_from_input,
             'selected_cookie_file': selected_cookie_file_path_for_backend,
             'manga_global_file_counter_ref': manga_global_file_counter_ref_for_thread,
@@ -3414,7 +3500,7 @@ class DownloaderApp (QWidget ):
                     'manga_mode_active', 'unwanted_keywords', 'manga_filename_style', 'scan_content_for_images',
                     'allow_multipart_download', 'use_cookie', 'cookie_text', 'app_base_dir', 'selected_cookie_file', 'override_output_dir', 'project_root_dir',
                     'text_only_scope', 'text_export_format',
-                    'single_pdf_mode',
+                    'single_pdf_mode','multipart_parts_count', 'multipart_min_size_mb', 
                     'use_date_prefix_for_subfolder','keep_in_post_duplicates', 'keep_duplicates_mode',
                     'keep_duplicates_limit', 'downloaded_hash_counts', 'downloaded_hash_counts_lock',
                     'processed_post_ids'
@@ -3431,7 +3517,6 @@ class DownloaderApp (QWidget ):
             self.is_paused = False
         return True
 
-
     def restore_download(self):
         """Initiates the download restoration process."""
         if self._is_download_active():
@@ -3478,6 +3563,7 @@ class DownloaderApp (QWidget ):
             if hasattr (self .download_thread ,'file_progress_signal'):self .download_thread .file_progress_signal .connect (self .update_file_progress_display )
             if hasattr (self .download_thread ,'missed_character_post_signal'):
                 self .download_thread .missed_character_post_signal .connect (self .handle_missed_character_post )
+            if hasattr(self.download_thread, 'overall_progress_signal'): self.download_thread.overall_progress_signal.connect(self.update_progress_display)           
             if hasattr (self .download_thread ,'retryable_file_failed_signal'):
 
                 if hasattr (self .download_thread ,'file_successfully_downloaded_signal'):
@@ -3862,7 +3948,12 @@ class DownloaderApp (QWidget ):
         if not filepath.lower().endswith('.pdf'):
             filepath += '.pdf'
         
-        font_path = os.path.join(self.app_base_dir, 'data', 'dejavu-sans', 'DejaVuSans.ttf')
+        if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
+            base_path = sys._MEIPASS
+        else:
+            base_path = self.app_base_dir
+
+        font_path = os.path.join(base_path, 'data', 'dejavu-sans', 'DejaVuSans.ttf')
         
         self.log_signal.emit("   Sorting collected posts by date (oldest first)...")
         sorted_content = sorted(posts_content_data, key=lambda x: x.get('published', 'Z'))
@@ -3871,8 +3962,8 @@ class DownloaderApp (QWidget ):
         self.log_signal.emit("="*40)
 
     def _add_to_history_candidates(self, history_data):
-        """Adds processed post data to the history candidates list and updates the creator profile."""
-        if self.save_creator_json_enabled_this_session:
+        """Adds processed post data to the history candidates list and updates the creator profile."""        
+        if self.save_creator_json_enabled_this_session and not self.is_single_post_session:
             post_id = history_data.get('post_id')
             service = history_data.get('service')
             user_id = history_data.get('user_id')
@@ -3880,7 +3971,6 @@ class DownloaderApp (QWidget ):
                 creator_key = (service.lower(), str(user_id))
                 creator_name = self.creator_name_cache.get(creator_key, f"{service}_{user_id}")
                 
-                # Load the profile data before using it to prevent NameError
                 profile_data = self._setup_creator_profile(creator_name, self.session_file_path)
                 
                 if post_id not in profile_data.get('processed_post_ids', []):
@@ -3893,6 +3983,7 @@ class DownloaderApp (QWidget ):
             history_data['creator_name'] = self.creator_name_cache.get(creator_key, history_data.get('user_id','Unknown'))
             self.download_history_candidates.append(history_data)
 
+
     def _finalize_download_history (self ):
         """Processes candidates and selects the final 3 history entries.
         Only updates final_download_history_entries if new candidates are available.
@@ -4182,9 +4273,12 @@ class DownloaderApp (QWidget ):
         # Update UI to "Cancelling" state
         self.pause_btn.setEnabled(False)
         self.cancel_btn.setEnabled(False)
+        
+        if hasattr(self, 'reset_button'):
+            self.reset_button.setEnabled(False)
+
         self.progress_label.setText(self._tr("status_cancelling", "Cancelling... Please wait."))
 
-        # Signal all active components to stop
         if self.download_thread and self.download_thread.isRunning():
             self.download_thread.requestInterruption()
             self.log_signal.emit("    Signaled single download thread to interrupt.")
@@ -4196,25 +4290,30 @@ class DownloaderApp (QWidget ):
             self.log_signal.emit("    Cancelling active External Link download thread...")
             self.external_link_download_thread.cancel()
 
-    def _get_domain_for_service (self ,service_name :str )->str :
+    def _get_domain_for_service(self, service_name: str) -> str:
         """Determines the base domain for a given service."""
-        if not isinstance (service_name ,str ):
-            return "kemono.su"
-        service_lower =service_name .lower ()
-        coomer_primary_services ={'onlyfans','fansly','manyvids','candfans','gumroad','patreon','subscribestar','dlsite','discord','fantia','boosty','pixiv','fanbox'}
-        if service_lower in coomer_primary_services and service_lower not in ['patreon','discord','fantia','boosty','pixiv','fanbox']:
-            return "coomer.su"
-        return "kemono.su"
-
+        if not isinstance(service_name, str):
+            return "kemono.cr"  # Default fallback
+        service_lower = service_name.lower()
+        coomer_primary_services = {'onlyfans', 'fansly', 'manyvids', 'candfans', 'gumroad', 'subscribestar', 'dlsite'}
+        if service_lower in coomer_primary_services:
+            return "coomer.st"
+        return "kemono.cr"
 
     def download_finished(self, total_downloaded, total_skipped, cancelled_by_user, kept_original_names_list=None):
-        if self.is_finishing:
+        if not self.finish_lock.acquire(blocking=False):
             return
-        self.is_finishing = True
 
         try:
+            if self.is_finishing:
+                return
+            self.is_finishing = True
+
             if cancelled_by_user:
                 self.log_signal.emit("✅ Cancellation complete. Resetting UI.")
+                self._clear_session_file()
+                self.interrupted_session_data = None
+                self.is_restore_pending = False
                 current_url = self.link_input.text()
                 current_dir = self.dir_input.text()
                 self._perform_soft_ui_reset(preserve_url=current_url, preserve_dir=current_dir)
@@ -4222,13 +4321,14 @@ class DownloaderApp (QWidget ):
                 self.file_progress_label.setText("")
                 if self.pause_event: self.pause_event.clear()
                 self.is_paused = False
-                return # Exit after handling cancellation
+                return
 
             self.log_signal.emit("🏁 Download of current item complete.")
 
             if self.is_processing_favorites_queue and self.favorite_download_queue:
                 self.log_signal.emit("✅ Item finished. Processing next in queue...")
-                self.is_finishing = False # Allow the next item in queue to start
+                self.is_finishing = False 
+                self.finish_lock.release() 
                 self._process_next_favorite_download()
                 return  
 
@@ -4317,6 +4417,7 @@ class DownloaderApp (QWidget ):
                                              QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
                 if reply == QMessageBox.Yes:
                     self.is_finishing = False # Allow retry session to start
+                    self.finish_lock.release() # Release lock for the retry session
                     self._start_failed_files_retry_session()
                     return # Exit to allow retry session to run
                 else:
@@ -4334,7 +4435,7 @@ class DownloaderApp (QWidget ):
             self.cancellation_message_logged_this_session = False
             self.active_update_profile = None 
         finally:
-            self.is_finishing = False
+            pass
 
     def _handle_keep_duplicates_toggled(self, checked):
         """Shows the duplicate handling dialog when the checkbox is checked."""
@@ -4454,44 +4555,51 @@ class DownloaderApp (QWidget ):
             self .active_retry_futures_map [future ]=job_details 
             self .active_retry_futures .append (future )
 
-    def _execute_single_file_retry (self ,job_details ,common_args ):
-        """Executes a single file download retry attempt."""
-        dummy_post_data ={'id':job_details ['original_post_id_for_log'],'title':job_details ['post_title']}
+    def _execute_single_file_retry(self, job_details, common_args):
+        """
+        Executes a single file download retry attempt. This function is called by the retry thread pool.
+        """
+        # This worker is temporary and only for this retry task.
+        # It needs dummy post data to initialize.
+        dummy_post_data = {'id': job_details['original_post_id_for_log'], 'title': job_details['post_title']}
 
-        ppw_init_args ={
-        **common_args ,
-        'post_data':dummy_post_data ,
-        'service':job_details .get ('service','unknown_service'),
-        'user_id':job_details .get ('user_id','unknown_user'),
-        'api_url_input':job_details .get ('api_url_input',''),
-        'manga_mode_active':job_details .get ('manga_mode_active_for_file',False ),
-        'manga_filename_style':job_details .get ('manga_filename_style_for_file',STYLE_POST_TITLE ),
-        'scan_content_for_images':common_args .get ('scan_content_for_images',False ),
-        'use_cookie':common_args .get ('use_cookie',False ),
-        'cookie_text':common_args .get ('cookie_text',""),
-        'selected_cookie_file':common_args .get ('selected_cookie_file',None ),
-        'app_base_dir':common_args .get ('app_base_dir',None ),
+        # Reconstruct the post_page_url, which is needed by the download function
+        service = job_details.get('service', 'unknown_service')
+        user_id = job_details.get('user_id', 'unknown_user')
+        post_id = job_details.get('original_post_id_for_log', 'unknown_id')
+        api_url_input = job_details.get('api_url_input', '')
+        parsed_api_url = urlparse(api_url_input)
+        api_domain = parsed_api_url.netloc if parsed_api_url.netloc else self._get_domain_for_service(service)
+        post_page_url = f"https://{api_domain}/{service}/user/{user_id}/post/{post_id}"
+
+        # Prepare all arguments for the PostProcessorWorker
+        ppw_init_args = {
+            **common_args,
+            'post_data': dummy_post_data,
+            'service': service,
+            'user_id': user_id,
+            'api_url_input': api_url_input
         }
-        worker =PostProcessorWorker (**ppw_init_args )
 
-        dl_count ,skip_count ,filename_saved ,original_kept ,status ,_ =worker ._download_single_file (
-        file_info =job_details ['file_info'],
-        target_folder_path =job_details ['target_folder_path'],
-        headers =job_details ['headers'],
-        original_post_id_for_log =job_details ['original_post_id_for_log'],
-        skip_event =None ,
-        post_title =job_details ['post_title'],
-        file_index_in_post =job_details ['file_index_in_post'],
-        num_files_in_this_post =job_details ['num_files_in_this_post'],
-        forced_filename_override =job_details .get ('forced_filename_override')
+        worker = PostProcessorWorker(**ppw_init_args)
+
+        # Call the download method with the corrected arguments
+        dl_count, skip_count, filename_saved, original_kept, status, _ = worker._download_single_file(
+            file_info=job_details['file_info'],
+            target_folder_path=job_details['target_folder_path'],
+            post_page_url=post_page_url, # Using the correct argument
+            original_post_id_for_log=job_details['original_post_id_for_log'],
+            skip_event=None,
+            post_title=job_details['post_title'],
+            file_index_in_post=job_details['file_index_in_post'],
+            num_files_in_this_post=job_details['num_files_in_this_post'],
+            forced_filename_override=job_details.get('forced_filename_override')
         )
 
+        is_successful_download = (status == FILE_DOWNLOAD_STATUS_SUCCESS)
+        is_resolved_as_skipped = (status == FILE_DOWNLOAD_STATUS_SKIPPED)
 
-
-        is_successful_download =(status ==FILE_DOWNLOAD_STATUS_SUCCESS )
-        is_resolved_as_skipped =(status ==FILE_DOWNLOAD_STATUS_SKIPPED )
-
-        return is_successful_download or is_resolved_as_skipped 
+        return is_successful_download or is_resolved_as_skipped
 
     def _handle_retry_future_result (self ,future ):
         self .processed_retry_count +=1 
@@ -4838,14 +4946,15 @@ class DownloaderApp (QWidget ):
         with QMutexLocker (self .prompt_mutex ):self ._add_character_response =result 
         self .log_signal .emit (f"    Main thread received character prompt response: {'Action resulted in addition/confirmation'if result else 'Action resulted in no addition/declined'}")
 
-    def _update_multipart_toggle_button_text (self ):
-        if hasattr (self ,'multipart_toggle_button'):
-            if self .allow_multipart_download_setting :
-                self .multipart_toggle_button .setText (self ._tr ("multipart_on_button_text","Multi-part: ON"))
-                self .multipart_toggle_button .setToolTip (self ._tr ("multipart_on_button_tooltip","Tooltip for multipart ON"))
-            else :
-                self .multipart_toggle_button .setText (self ._tr ("multipart_off_button_text","Multi-part: OFF"))
-                self .multipart_toggle_button .setToolTip (self ._tr ("multipart_off_button_tooltip","Tooltip for multipart OFF"))
+    def _update_multipart_toggle_button_text(self):
+        if hasattr(self, 'multipart_toggle_button'):
+            if self.allow_multipart_download_setting:
+                scope_text = self.multipart_scope.capitalize()
+                self.multipart_toggle_button.setText(self._tr("multipart_on_button_text", f"Multi-part: {scope_text}"))
+                self.multipart_toggle_button.setToolTip(self._tr("multipart_on_button_tooltip", f"Multipart download is ON. Applied to: {scope_text} files. Click to change."))
+            else:
+                self.multipart_toggle_button.setText(self._tr("multipart_off_button_text", "Multi-part: OFF"))
+                self.multipart_toggle_button.setToolTip(self._tr("multipart_off_button_tooltip", "Multipart download is OFF. Click to enable and set options."))
 
     def _update_error_button_count(self):
         """Updates the Error button text to show the count of failed files."""
@@ -4860,36 +4969,25 @@ class DownloaderApp (QWidget ):
         else:
             self.error_btn.setText(base_text)
 
-    def _toggle_multipart_mode (self ):
-        if not self .allow_multipart_download_setting :
-            msg_box =QMessageBox (self )
-            msg_box .setIcon (QMessageBox .Warning )
-            msg_box .setWindowTitle ("Multi-part Download Advisory")
-            msg_box .setText (
-            "<b>Multi-part download advisory:</b><br><br>"
-            "<ul>"
-            "<li>Best suited for <b>large files</b> (e.g., single post videos).</li>"
-            "<li>When downloading a full creator feed with many small files (like images):"
-            "<ul><li>May not offer significant speed benefits.</li>"
-            "<li>Could potentially make the UI feel <b>choppy</b>.</li>"
-            "<li>May <b>spam the process log</b> with rapid, numerous small download messages.</li></ul></li>"
-            "<li>Consider using the <b>'Videos' filter</b> if downloading a creator feed to primarily target large files for multi-part.</li>"
-            "</ul><br>"
-            "Do you want to enable multi-part download?"
-            )
-            proceed_button =msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
-            cancel_button =msg_box .addButton ("Cancel",QMessageBox .RejectRole )
-            msg_box .setDefaultButton (proceed_button )
-            msg_box .exec_ ()
-
-            if msg_box .clickedButton ()==cancel_button :
-                self .log_signal .emit ("ℹ️ Multi-part download enabling cancelled by user.")
-                return 
-
-        self .allow_multipart_download_setting =not self .allow_multipart_download_setting 
-        self ._update_multipart_toggle_button_text ()
-        self .settings .setValue (ALLOW_MULTIPART_DOWNLOAD_KEY ,self .allow_multipart_download_setting )
-        self .log_signal .emit (f"ℹ️ Multi-part download set to: {'Enabled'if self .allow_multipart_download_setting else 'Disabled'}")
+    def _toggle_multipart_mode(self):
+        """
+        Opens the Multipart Scope Dialog and updates settings based on user choice.
+        """
+        current_scope = self.multipart_scope if self.allow_multipart_download_setting else 'both'
+        dialog = MultipartScopeDialog(current_scope, self.multipart_parts_count, self.multipart_min_size_mb, self)
+        
+        if dialog.exec_() == QDialog.Accepted:
+            self.multipart_scope = dialog.get_selected_scope()
+            self.multipart_parts_count = dialog.get_selected_parts()
+            self.multipart_min_size_mb = dialog.get_selected_min_size() # Get the new value
+            self.allow_multipart_download_setting = True
+            self.log_signal.emit(f"ℹ️ Multi-part download enabled: Scope='{self.multipart_scope.capitalize()}', Parts={self.multipart_parts_count}, Min Size={self.multipart_min_size_mb} MB")
+        else:
+            self.allow_multipart_download_setting = False
+            self.log_signal.emit("ℹ️ Multi-part download setting remains OFF.")
+            
+        self._update_multipart_toggle_button_text()
+        self.settings.setValue(ALLOW_MULTIPART_DOWNLOAD_KEY, self.allow_multipart_download_setting)
 
     def _open_known_txt_file (self ):
         if not os .path .exists (self .config_file ):
@@ -5164,6 +5262,31 @@ class DownloaderApp (QWidget ):
                     if hasattr(self, 'link_input'):
                         self.last_link_input_text_for_queue_sync = self.link_input.text()
 
+                # --- START: MODIFIED LOGIC ---
+                # Manually trigger the UI update now that the queue is populated and the dialog is closed.
+                self.update_ui_for_manga_mode(self.manga_mode_checkbox.isChecked() if self.manga_mode_checkbox else False)
+                # --- END: MODIFIED LOGIC ---
+
+    def _load_saved_cookie_settings(self):
+        """Loads and applies saved cookie settings on startup."""
+        try:
+            use_cookie_saved = self.settings.value(USE_COOKIE_KEY, False, type=bool)
+            cookie_content_saved = self.settings.value(COOKIE_TEXT_KEY, "", type=str)
+
+            if use_cookie_saved and cookie_content_saved:
+                self.use_cookie_checkbox.setChecked(True)
+                self.cookie_text_input.setText(cookie_content_saved)
+                
+                # Check if the saved content is a file path and update UI accordingly
+                if os.path.exists(cookie_content_saved):
+                    self.selected_cookie_filepath = cookie_content_saved
+                    self.cookie_text_input.setReadOnly(True)
+                    self._update_cookie_input_placeholders_and_tooltips()
+                
+                self.log_signal.emit(f"ℹ️ Loaded saved cookie settings.")
+        except Exception as e:
+            self.log_signal.emit(f"⚠️ Could not load saved cookie settings: {e}")
+
     def _show_favorite_artists_dialog (self ):
         if self ._is_download_active ()or self .is_processing_favorites_queue :
             QMessageBox .warning (self ,"Busy","Another download operation is already in progress.")
@@ -5219,42 +5342,54 @@ class DownloaderApp (QWidget ):
 
         target_domain_preference_for_fetch =None 
 
-        if cookies_config ['use_cookie']:
-            self .log_signal .emit ("Favorite Posts: 'Use Cookie' is checked. Determining target domain...")
-            kemono_cookies =prepare_cookies_for_request (
-            cookies_config ['use_cookie'],
-            cookies_config ['cookie_text'],
-            cookies_config ['selected_cookie_file'],
-            cookies_config ['app_base_dir'],
-            lambda msg :self .log_signal .emit (f"[FavPosts Cookie Check - Kemono] {msg }"),
-            target_domain ="kemono.su"
+        if cookies_config['use_cookie']:
+            self.log_signal.emit("Favorite Posts: 'Use Cookie' is checked. Determining target domain...")
+            
+            # --- Kemono Check with Fallback ---
+            kemono_cookies = prepare_cookies_for_request(
+                cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                target_domain="kemono.cr"
             )
-            coomer_cookies =prepare_cookies_for_request (
-            cookies_config ['use_cookie'],
-            cookies_config ['cookie_text'],
-            cookies_config ['selected_cookie_file'],
-            cookies_config ['app_base_dir'],
-            lambda msg :self .log_signal .emit (f"[FavPosts Cookie Check - Coomer] {msg }"),
-            target_domain ="coomer.su"
+            if not kemono_cookies:
+                self.log_signal.emit("  ↳ No cookies for kemono.cr, trying fallback kemono.su...")
+                kemono_cookies = prepare_cookies_for_request(
+                    cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                    cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                    target_domain="kemono.su"
+                )
+
+            # --- Coomer Check with Fallback ---
+            coomer_cookies = prepare_cookies_for_request(
+                cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                target_domain="coomer.st"
             )
+            if not coomer_cookies:
+                self.log_signal.emit("  ↳ No cookies for coomer.st, trying fallback coomer.su...")
+                coomer_cookies = prepare_cookies_for_request(
+                    cookies_config['use_cookie'], cookies_config['cookie_text'], cookies_config['selected_cookie_file'],
+                    cookies_config['app_base_dir'], lambda msg: self.log_signal.emit(f"[FavPosts Cookie Check] {msg}"),
+                    target_domain="coomer.su"
+                )
 
-            kemono_ok =bool (kemono_cookies )
-            coomer_ok =bool (coomer_cookies )
+            kemono_ok = bool(kemono_cookies)
+            coomer_ok = bool(coomer_cookies)
 
-            if kemono_ok and not coomer_ok :
-                target_domain_preference_for_fetch ="kemono.su"
-                self .log_signal .emit ("  ↳ Only Kemono.su cookies loaded. Will fetch favorites from Kemono.su only.")
-            elif coomer_ok and not kemono_ok :
-                target_domain_preference_for_fetch ="coomer.su"
-                self .log_signal .emit ("  ↳ Only Coomer.su cookies loaded. Will fetch favorites from Coomer.su only.")
-            elif kemono_ok and coomer_ok :
-                target_domain_preference_for_fetch =None 
-                self .log_signal .emit ("  ↳ Cookies for both Kemono.su and Coomer.su loaded. Will attempt to fetch from both.")
-            else :
-                self .log_signal .emit ("  ↳ No valid cookies loaded for Kemono.su or Coomer.su.")
-                cookie_help_dialog =CookieHelpDialog (self ,self )
-                cookie_help_dialog .exec_ ()
-                return 
+            if kemono_ok and not coomer_ok:
+                target_domain_preference_for_fetch = "kemono.cr"
+                self.log_signal.emit("  ↳ Only Kemono cookies loaded. Will fetch favorites from Kemono.cr only.")
+            elif coomer_ok and not kemono_ok:
+                target_domain_preference_for_fetch = "coomer.st"
+                self.log_signal.emit("  ↳ Only Coomer cookies loaded. Will fetch favorites from Coomer.st only.")
+            elif kemono_ok and coomer_ok:
+                target_domain_preference_for_fetch = None
+                self.log_signal.emit("  ↳ Cookies for both Kemono and Coomer loaded. Will attempt to fetch from both.")
+            else:
+                self.log_signal.emit("  ↳ No valid cookies loaded for Kemono.cr or Coomer.st.")
+                cookie_help_dialog = CookieHelpDialog(self, self)
+                cookie_help_dialog.exec_()
+                return
         else :
             self .log_signal .emit ("Favorite Posts: 'Use Cookie' is NOT checked. Cookies are required.")
             cookie_help_dialog =CookieHelpDialog (self ,self )
@@ -5285,7 +5420,7 @@ class DownloaderApp (QWidget ):
         else :
             self .log_signal .emit ("ℹ️ Favorite posts selection cancelled.")
 
-    def _process_next_favorite_download (self ):
+    def _process_next_favorite_download(self):
 
         if self.favorite_download_queue and not self.is_processing_favorites_queue:
             manga_mode_is_checked = self.manga_mode_checkbox.isChecked() if self.manga_mode_checkbox else False
@@ -5330,33 +5465,43 @@ class DownloaderApp (QWidget ):
         next_url =self .current_processing_favorite_item_info ['url']
         item_display_name =self .current_processing_favorite_item_info .get ('name','Unknown Item')
 
-        item_type =self .current_processing_favorite_item_info .get ('type','artist')
-        self .log_signal .emit (f"▶️ Processing next favorite from queue: '{item_display_name }' ({next_url })")
+        # --- START: MODIFIED SECTION ---
+        # Get the type of item from the queue to help start_download make smarter decisions.
+        item_type = self.current_processing_favorite_item_info.get('type', 'artist')
+        self.log_signal.emit(f"▶️ Processing next favorite from queue ({item_type}): '{item_display_name}' ({next_url})")
 
-        override_dir =None 
-        item_scope =self .current_processing_favorite_item_info .get ('scope_from_popup')
-        if item_scope is None :
-            item_scope =self .favorite_download_scope 
+        override_dir = None
+        item_scope = self.current_processing_favorite_item_info.get('scope_from_popup')
+        if item_scope is None:
+            item_scope = self.favorite_download_scope
 
-        main_download_dir =self .dir_input .text ().strip ()
+        main_download_dir = self.dir_input.text().strip()
 
-        should_create_artist_folder =False 
-        if item_type =='creator_popup_selection'and item_scope ==EmptyPopupDialog .SCOPE_CREATORS :
-            should_create_artist_folder =True 
-        elif item_type !='creator_popup_selection'and self .favorite_download_scope ==FAVORITE_SCOPE_ARTIST_FOLDERS :
-            should_create_artist_folder =True 
+        should_create_artist_folder = False
+        if item_type == 'creator_popup_selection' and item_scope == EmptyPopupDialog.SCOPE_CREATORS:
+            should_create_artist_folder = True
+        elif item_type != 'creator_popup_selection' and self.favorite_download_scope == FAVORITE_SCOPE_ARTIST_FOLDERS:
+            should_create_artist_folder = True
 
-        if should_create_artist_folder and main_download_dir :
-            folder_name_key =self .current_processing_favorite_item_info .get ('name_for_folder','Unknown_Folder')
-            item_specific_folder_name =clean_folder_name (folder_name_key )
-            override_dir =os .path .normpath (os .path .join (main_download_dir ,item_specific_folder_name ))
-            self .log_signal .emit (f"    Scope requires artist folder. Target directory: '{override_dir }'")
+        if should_create_artist_folder and main_download_dir:
+            folder_name_key = self.current_processing_favorite_item_info.get('name_for_folder', 'Unknown_Folder')
+            item_specific_folder_name = clean_folder_name(folder_name_key)
+            override_dir = os.path.normpath(os.path.join(main_download_dir, item_specific_folder_name))
+            self.log_signal.emit(f"    Scope requires artist folder. Target directory: '{override_dir}'")
 
-        success_starting_download =self .start_download (direct_api_url =next_url ,override_output_dir =override_dir, is_continuation=True )
+        # Pass the item_type to the start_download function
+        success_starting_download = self.start_download(
+            direct_api_url=next_url,
+            override_output_dir=override_dir,
+            is_continuation=True,
+            item_type_from_queue=item_type
+        )
+        # --- END: MODIFIED SECTION ---
 
-        if not success_starting_download :
-            self .log_signal .emit (f"⚠️ Failed to initiate download for '{item_display_name }'. Skipping this item in queue.")
-            self .download_finished (total_downloaded =0 ,total_skipped =1 ,cancelled_by_user =True ,kept_original_names_list =[])
+        if not success_starting_download:
+            self.log_signal.emit(f"⚠️ Failed to initiate download for '{item_display_name}'. Skipping and moving to the next item in queue.")
+            # Use a QTimer to avoid deep recursion and correctly move to the next item.
+            QTimer.singleShot(100, self._process_next_favorite_download)
 
 class ExternalLinkDownloadThread (QThread ):
     """A QThread to handle downloading multiple external links sequentially."""

src/utils/network_utils.py

@@ -196,10 +196,9 @@ def get_link_platform(url):
         if 'twitter.com' in domain or 'x.com' in domain: return 'twitter/x'
         if 'discord.gg' in domain or 'discord.com/invite' in domain: return 'discord invite'
         if 'pixiv.net' in domain: return 'pixiv'
-        if 'kemono.su' in domain or 'kemono.party' in domain: return 'kemono'
-        if 'coomer.su' in domain or 'coomer.party' in domain: return 'coomer'
+        if 'kemono.su' in domain or 'kemono.party' in domain or 'kemono.cr' in domain: return 'kemono'
+        if 'coomer.su' in domain or 'coomer.party' in domain or 'coomer.st' in domain: return 'coomer'
         
-        # Fallback to a generic name for other domains
         parts = domain.split('.')
         if len(parts) >= 2:
             return parts[-2]