import { memo, useEffect, useMemo, useRef, useState } from 'react';
import { createPortal } from 'react-dom';
import { useTranslation } from 'react-i18next';
import { Link, useLocation, useParams } from 'react-router-dom';
import { useFloating, offset, size, Placement } from '@floating-ui/react';
import { Comment, useReplies } from '@plebbit/plebbit-react-hooks';
import Plebbit from '@plebbit/plebbit-js';
import { shouldShowSnow } from '../../lib/snow';
import { getHasThumbnail } from '../../lib/utils/media-utils';
import { getFormattedTimeAgo } from '../../lib/utils/time-utils';
import { isAllView, isSubscriptionsView } from '../../lib/utils/view-utils';
import { useDirectories } from '../../hooks/use-directories';
import { getBoardPath } from '../../lib/utils/route-utils';
import useCatalogFiltersStore from '../../stores/use-catalog-filters-store';
import useCatalogStyleStore from '../../stores/use-catalog-style-store';
import useEditCommentPrivileges from '../../hooks/use-author-privileges';
import { useCommentMediaInfo } from '../../hooks/use-comment-media-info';
import useCountLinksInReplies from '../../hooks/use-count-links-in-replies';
import useFetchGifFirstFrame from '../../hooks/use-fetch-gif-first-frame';
import useHide from '../../hooks/use-hide';
import { ContentPreview } from '../../views/home/popular-threads-box';
import PostMenuDesktop from '../post-desktop/post-menu-desktop';
import styles from './catalog-row.module.css';
import capitalize from 'lodash/capitalize';
import { selectPostMenuProps } from '../../lib/utils/post-menu-props';

interface CatalogPostMediaProps {
  cid: string;
  commentMediaInfo: any;
  isOutOfFeed?: boolean;
  linkWidth?: number;
  linkHeight?: number;
}

export const CatalogPostMedia = ({ cid, commentMediaInfo, linkWidth, linkHeight }: CatalogPostMediaProps) => {
  const { patternThumbnailUrl, thumbnail, type, url } = commentMediaInfo || {};
  const iframeThumbnail = patternThumbnailUrl || thumbnail;
  const gifFrameUrl = useFetchGifFirstFrame(type === 'gif' ? url : undefined);
  const [isLoaded, setIsLoaded] = useState(false);
  const [hasError, setHasError] = useState(false);
  const handleLoad = () => setIsLoaded(true);
  const handleError = () => setHasError(true);
  const loadingStyle = { opacity: isLoaded ? 1 : 0 };

  const { imageSize } = useCatalogStyleStore();

  let displayWidth, displayHeight;
  const maxThumbnailSize = imageSize === 'Large' ? 250 : 150;

  if (linkWidth && linkHeight) {
    let scale = Math.min(1, maxThumbnailSize / Math.max(linkWidth, linkHeight));
    displayWidth = `${linkWidth * scale}px`;
    displayHeight = `${linkHeight * scale}px`;
  } else {
    displayWidth = `${maxThumbnailSize}px`;
    displayHeight = `${maxThumbnailSize}px`;
  }

  if (type === 'audio') {
    displayWidth = 'unset';
    displayHeight = 'unset';
  }

  const numericWidth = parseInt(displayWidth) || undefined;
  const numericHeight = parseInt(displayHeight) || undefined;

  const maxWidth = imageSize === 'Large' ? '250px' : '150px';
  const maxHeight = imageSize === 'Large' ? '250px' : '150px';

  const CSSProperties = {
    '--width': displayWidth,
    '--height': displayHeight,
    '--maxWidth': maxWidth,
    '--maxHeight': maxHeight,
  } as React.CSSProperties;

  let thumbnailComponent: React.ReactNode = null;

  if (type === 'gif' && gifFrameUrl && !hasError) {
    thumbnailComponent = <img src={gifFrameUrl} alt='' onLoad={handleLoad} onError={handleError} style={loadingStyle} width={numericWidth} height={numericHeight} />;
  } else if (type === 'image' && !hasError) {
    thumbnailComponent = <img src={url} alt='' onLoad={handleLoad} onError={handleError} style={loadingStyle} width={numericWidth} height={numericHeight} />;
  } else if (type === 'video' && !hasError) {
    thumbnailComponent = thumbnail ? (
      <img src={thumbnail} alt='' onLoad={handleLoad} onError={handleError} style={loadingStyle} width={numericWidth} height={numericHeight} />
    ) : (
      // show first frame of the video, as a workaround for Safari not loading thumbnails
      <video src={`${url}#t=0.001`} onError={handleError} />
    );
  } else if (type === 'webpage' && !hasError) {
    thumbnailComponent = <img src={thumbnail} alt='' onLoad={handleLoad} onError={handleError} style={loadingStyle} width={numericWidth} height={numericHeight} />;
  } else if (type === 'iframe' && iframeThumbnail && !hasError) {
    thumbnailComponent = <img src={iframeThumbnail} alt='' onLoad={handleLoad} onError={handleError} style={loadingStyle} width={numericWidth} height={numericHeight} />;
  } else if (type === 'audio') {
    thumbnailComponent = <audio src={url} controls />;
  }

  const matchedFilterColor = useCatalogFiltersStore((state) => state.matchedFilters.get(cid || ''));

  return (
    <div
      className={hasError ? '' : styles.mediaWrapper}
      style={{
        ...CSSProperties,
        ...(matchedFilterColor ? { border: `3px solid ${matchedFilterColor}` } : {}),
      }}
    >
      {!isLoaded && !hasError && type !== 'video' && type !== 'audio' && <span className={styles.loadingSkeleton} />}
      {hasError ? <img className={styles.fileDeleted} src='assets/filedeleted-res.gif' alt='' /> : thumbnailComponent}
    </div>
  );
};

// Memoize CatalogPost to prevent rerenders when parent rerenders due to updatingState
const CatalogPost = memo(
  ({ post }: { post: Comment }) => {
    const { t } = useTranslation();
    const { author, cid, content, link, linkHeight, linkWidth, locked, pinned, replyCount, spoiler, subplebbitAddress, timestamp, title, thumbnailUrl } = post || {};
    const linkCount = useCountLinksInReplies(post);

    const commentMediaInfo = useCommentMediaInfo(link, thumbnailUrl, linkWidth, linkHeight);
    const hasThumbnail = getHasThumbnail(commentMediaInfo, link);

    const { hidden } = useHide({ cid });

    const location = useLocation();
    const params = useParams();
    const isInAllView = isAllView(location.pathname);
    const isInSubscriptionsView = isSubscriptionsView(location.pathname, params);
    const directories = useDirectories();
    const boardPath = subplebbitAddress ? getBoardPath(subplebbitAddress, directories) : '';
    const postMenuProps = useMemo(() => selectPostMenuProps(post), [post]);

    const postLink = boardPath ? `/${boardPath}/thread/${cid}` : `/thread/${cid}`;

    const threadIcons = (
      <div className={styles.threadIcons}>
        {pinned && <span className={styles.stickyIcon} title={t('sticky')} />}
        {locked && <span className={styles.closedIcon} title={t('closed')} />}
      </div>
    );

    const [hoveredCid, setHoveredCid] = useState<string | null>(null);
    const [showPortal, setShowPortal] = useState<boolean>(false);
    const placementRef = useRef<Placement>('right-start');
    const timeoutRef = useRef<NodeJS.Timeout | null>(null);

    const { refs, floatingStyles, update } = useFloating({
      open: showPortal,
      placement: placementRef.current,
      middleware: [
        offset({ mainAxis: 5 }),
        size({
          apply({ elements }) {
            const referenceElement = refs.reference.current;
            if (referenceElement) {
              const availableWidthToTheRight = window.innerWidth - (referenceElement.getBoundingClientRect().left + referenceElement.getBoundingClientRect().width);
              const availableWidthToTheLeft = referenceElement.getBoundingClientRect().left;
              const minWidth = window.innerWidth * 0.25;

              if (availableWidthToTheRight >= minWidth) {
                placementRef.current = 'right-start';
                elements.floating.style.maxWidth = `${availableWidthToTheRight - 40}px`;
              } else if (availableWidthToTheLeft >= minWidth) {
                placementRef.current = 'left-start';
                elements.floating.style.maxWidth = `${availableWidthToTheLeft - 25}px`;
              } else if (availableWidthToTheRight > availableWidthToTheLeft) {
                placementRef.current = 'right-start';
                elements.floating.style.maxWidth = `${availableWidthToTheRight - 40}px`;
              } else {
                placementRef.current = 'left-start';
                elements.floating.style.maxWidth = `${availableWidthToTheLeft - 25}px`;
              }
            }
          },
        }),
      ],
    });

    useEffect(() => {
      if (showPortal) update();
    }, [showPortal, update]);

    const { replies } = useReplies({ comment: showPortal ? post : undefined, flat: true });
    const lastReply = replies?.length > 0 ? replies[replies.length - 1] : null;

    const { isCommentAuthorMod: isCatalogPostAuthorMod, commentAuthorRole: catalogPostAuthorRole } = useEditCommentPrivileges({
      commentAuthorAddress: author?.address,
      subplebbitAddress,
    });
    const { isCommentAuthorMod: isLastReplyAuthorMod, commentAuthorRole: lastReplyAuthorRole } = useEditCommentPrivileges({
      commentAuthorAddress: lastReply?.author?.address,
      subplebbitAddress,
    });

    const postContent = (
      <div className={`${styles.teaser} ${hidden && styles.hidden}`}>
        {hidden ? (
          <b>({t('hidden')})</b>
        ) : (
          <>
            {title && (
              <span>
                <b>{title}</b>
                {content ? ': ' : ''}
              </span>
            )}
            {content && <ContentPreview content={content} maxLength={9999} />}
          </>
        )}
      </div>
    );

    const { imageSize, showOPComment } = useCatalogStyleStore();
    const maxWidth = imageSize === 'Large' ? '250px' : '150px';
    const maxHeight = imageSize === 'Large' ? '250px' : '150px';
    const CSSProperties = {
      '--maxWidth': maxWidth,
      '--maxHeight': maxHeight,
    } as React.CSSProperties;

    const isTextOnlyThread = !hasThumbnail;

    return (
      <>
        <div className={`${styles.post} ${imageSize === 'Large' ? styles.large : ''}`} style={CSSProperties}>
          <div onMouseOver={() => setHoveredCid(cid)} onMouseLeave={() => setHoveredCid(null)}>
            {hidden ? (
              <Link to={postLink}>
                <span className={styles.hiddenThumbnail} />
              </Link>
            ) : hasThumbnail ? (
              <>
                {shouldShowSnow() && hasThumbnail && <img src='assets/xmashat.gif' className={styles.xmasHat} alt='' />}
                <Link to={postLink}>
                  <div
                    className={`${styles.mediaPaddingWrapper} ${hidden && styles.hidden}`}
                    ref={refs.setReference}
                    onMouseOver={() => (timeoutRef.current = setTimeout(() => setShowPortal(true), 250))}
                    onMouseLeave={() => {
                      setShowPortal(false);
                      if (timeoutRef.current) {
                        clearTimeout(timeoutRef.current);
                        timeoutRef.current = null;
                      }
                    }}
                  >
                    {threadIcons}
                    {spoiler ? (
                      <img src='assets/spoiler.png' alt='' />
                    ) : (
                      <CatalogPostMedia cid={cid} commentMediaInfo={commentMediaInfo} linkWidth={linkWidth} linkHeight={linkHeight} />
                    )}
                  </div>
                </Link>
              </>
            ) : (
              threadIcons
            )}
            <div className={styles.meta} title='(R)eplies / (L)ink Replies'>
              R: <b>{replyCount || '0'}</b>
              {linkCount > 0 && (
                <span>
                  {' '}
                  / L: <b>{linkCount}</b>
                </span>
              )}
              <span className={`${styles.postMenu} ${hoveredCid && styles.postMenuVisible}`}>
                <PostMenuDesktop postMenu={postMenuProps} />
              </span>
            </div>
            <div className={styles.postContent}>{(showOPComment || isTextOnlyThread) && (hasThumbnail ? postContent : <Link to={postLink}>{postContent}</Link>)}</div>
          </div>
        </div>
        {hoveredCid === cid &&
          showPortal &&
          createPortal(
            <div className={styles.postPreview} ref={refs.setFloating} style={floatingStyles}>
              {title ? (
                <>
                  <span className={styles.postSubject}>{title} </span>
                  {t('by')}
                </>
              ) : (
                t('posted_by')
              )}{' '}
              <span className={`${styles.postAuthor} ${isCatalogPostAuthorMod && styles.capcode}`}>
                {author?.displayName || capitalize(t('anonymous'))}
                {isCatalogPostAuthorMod && <span className='capitalize'>{` ## Board ${catalogPostAuthorRole}`}</span>}
              </span>
              {(isInAllView || isInSubscriptionsView) && subplebbitAddress && ` to p/${Plebbit.getShortAddress({ address: subplebbitAddress })}`}
              <span className={styles.postAgo}> {getFormattedTimeAgo(timestamp)}</span>
              {replyCount > 0 && (
                <div className={styles.postLast}>
                  {t('last_reply_by')}{' '}
                  <span className={`${styles.postAuthor} ${isLastReplyAuthorMod && styles.capcode}`}>
                    {lastReply?.author?.displayName || capitalize(t('anonymous'))}
                    {isLastReplyAuthorMod && ` ## Board ${lastReplyAuthorRole}`}
                  </span>
                  <span className={styles.postAgo}> {getFormattedTimeAgo(lastReply?.timestamp)}</span>
                </div>
              )}
            </div>,
            document.body,
          )}
      </>
    );
  },
  (prevProps, nextProps) => {
    const prev = prevProps.post;
    const next = nextProps.post;
    // Compare all fields that affect rendering to avoid stale displays
    return (
      prev?.cid === next?.cid &&
      prev?.replyCount === next?.replyCount &&
      prev?.locked === next?.locked &&
      prev?.pinned === next?.pinned &&
      prev?.title === next?.title &&
      prev?.content === next?.content &&
      prev?.spoiler === next?.spoiler &&
      prev?.timestamp === next?.timestamp &&
      prev?.author?.displayName === next?.author?.displayName &&
      prev?.author?.address === next?.author?.address &&
      prev?.link === next?.link &&
      prev?.thumbnailUrl === next?.thumbnailUrl &&
      prev?.linkWidth === next?.linkWidth &&
      prev?.linkHeight === next?.linkHeight &&
      prev?.subplebbitAddress === next?.subplebbitAddress
    );
  },
);

interface CatalogRowProps {
  index?: number;
  row: Comment[];
}

const CatalogRow = memo(({ row }: CatalogRowProps) => {
  return (
    <div className={styles.row}>
      {row.map((post, index) => (
        <CatalogPost key={post?.cid || index} post={post} />
      ))}
    </div>
  );
});

export default CatalogRow;
