import { create } from "zustand";
import { storageService } from "@/lib/storage/storage-service";
import { useTimelineStore } from "../apps/web/src/stores/timeline-store";
import { generateUUID } from "@/lib/utils";
import { MediaType, MediaFile } from "@/types/media";
import { videoCache } from "@/lib/video-cache";

interface MediaStore {
  mediaFiles: MediaFile[];
  isLoading: boolean;

  // Actions
  addMediaFile: (
    projectId: string,
    file: Omit<MediaFile, "id">,
  ) => Promise<void>;
  removeMediaFile: (projectId: string, id: string) => Promise<void>;
  loadProjectMedia: (projectId: string) => Promise<void>;
  clearProjectMedia: (projectId: string) => Promise<void>;
  clearAllMedia: () => void;
}

// Helper function to determine file type
export const getFileType = (file: File): MediaType | null => {
  const { type } = file;

  if (type.startsWith("image/")) {
    return "image";
  }
  if (type.startsWith("video/")) {
    return "video";
  }
  if (type.startsWith("audio/")) {
    return "audio";
  }

  return null;
};

// Helper function to get image dimensions
export const getImageDimensions = (
  file: File,
): Promise<{ width: number; height: number }> => {
  return new Promise((resolve, reject) => {
    const img = new window.Image();

    img.addEventListener("load", () => {
      const width = img.naturalWidth;
      const height = img.naturalHeight;
      resolve({ width, height });
      img.remove();
    });

    img.addEventListener("error", () => {
      reject(new Error("Could not load image"));
      img.remove();
    });

    img.src = URL.createObjectURL(file);
  });
};

// Helper function to get media duration
export const getMediaDuration = (file: File): Promise<number> => {
  return new Promise((resolve, reject) => {
    const element = document.createElement(
      file.type.startsWith("video/") ? "video" : "audio",
    ) as HTMLVideoElement;

    element.addEventListener("loadedmetadata", () => {
      resolve(element.duration);
      element.remove();
    });

    element.addEventListener("error", () => {
      reject(new Error("Could not load media"));
      element.remove();
    });

    element.src = URL.createObjectURL(file);
    element.load();
  });
};

export const getMediaAspectRatio = (item: MediaFile): number => {
  if (item.width && item.height) {
    return item.width / item.height;
  }
  return 16 / 9; // Default aspect ratio
};

export const useMediaStore = create<MediaStore>((set, get) => ({
  mediaFiles: [],
  isLoading: false,

  addMediaFile: async (projectId, file) => {
    const newItem: MediaFile = {
      ...file,
      id: generateUUID(),
    };

    // Add to local state immediately for UI responsiveness
    set((state) => ({
      mediaFiles: [...state.mediaFiles, newItem],
    }));

    // Save to persistent storage in background
    try {
      await storageService.saveMediaFile({ projectId, mediaItem: newItem });
    } catch (error) {
      console.error("Failed to save media item:", error);
      // Remove from local state if save failed
      set((state) => ({
        mediaFiles: state.mediaFiles.filter((media) => media.id !== newItem.id),
      }));
    }
  },

  removeMediaFile: async (projectId: string, id: string) => {
    const state = get();
    const item = state.mediaFiles.find((media) => media.id === id);

    videoCache.clearVideo(id);

    // Cleanup object URLs to prevent memory leaks
    if (item?.url) {
      URL.revokeObjectURL(item.url);
      if (item.thumbnailUrl) {
        URL.revokeObjectURL(item.thumbnailUrl);
      }
    }

    // 1) Remove from local state immediately
    set((state) => ({
      mediaFiles: state.mediaFiles.filter((media) => media.id !== id),
    }));

    // 2) Cascade into the timeline: remove any elements using this media ID
    const timeline = useTimelineStore.getState();
    const { tracks, deleteSelected, setSelectedElements } = timeline;

    // Find all elements that reference this media
    const elementsToRemove: Array<{ trackId: string; elementId: string }> = [];
    for (const track of tracks) {
      for (const el of track.elements) {
        if (el.type === "media" && el.mediaId === id) {
          elementsToRemove.push({ trackId: track.id, elementId: el.id });
        }
      }
    }

    // If there are elements to remove, use unified delete function
    if (elementsToRemove.length > 0) {
      setSelectedElements(elementsToRemove);
      deleteSelected();
    }

    // 3) Remove from persistent storage
    try {
      await storageService.deleteMediaFile({ projectId, id });
    } catch (error) {
      console.error("Failed to delete media item:", error);
    }
  },

  loadProjectMedia: async (projectId) => {
    set({ isLoading: true });

    try {
      const mediaItems = await storageService.loadAllMediaFiles({ projectId });
      set({ mediaFiles: mediaItems });
    } catch (error) {
      console.error("Failed to load media items:", error);
    } finally {
      set({ isLoading: false });
    }
  },

  clearProjectMedia: async (projectId) => {
    const state = get();

    // Cleanup all object URLs
    state.mediaFiles.forEach((item) => {
      if (item.url) {
        URL.revokeObjectURL(item.url);
      }
      if (item.thumbnailUrl) {
        URL.revokeObjectURL(item.thumbnailUrl);
      }
    });

    // Clear local state
    set({ mediaFiles: [] });

    // Clear persistent storage
    try {
      const mediaIds = state.mediaFiles.map((item) => item.id);
      await Promise.all(
        mediaIds.map((id) => storageService.deleteMediaFile({ projectId, id })),
      );
    } catch (error) {
      console.error("Failed to clear media items from storage:", error);
    }
  },

  clearAllMedia: () => {
    const state = get();

    videoCache.clearAll();

    // Cleanup all object URLs
    state.mediaFiles.forEach((item) => {
      if (item.url) {
        URL.revokeObjectURL(item.url);
      }
      if (item.thumbnailUrl) {
        URL.revokeObjectURL(item.thumbnailUrl);
      }
    });

    // Clear local state
    set({ mediaFiles: [] });
  },
}));