// @ts-nocheck
import React, { useEffect, useState } from 'react';
import { Page } from './_util';
import { useParams, useSearchParams } from 'react-router-dom';
import { usePollGalleryDelta } from '../polling/usePollGalleryDelta';
import FiltersBar, { type GalleryFilter } from '../components/FiltersBar';
import { Heart, Image as ImageIcon, Share2 } from 'lucide-react';
import { motion } from 'framer-motion';
import { likePhoto } from '../services/photosApi';
import PhotoLightbox from './PhotoLightbox';
import { fetchEvent, type EventData } from '../services/eventApi';
import { useTranslation } from '../i18n/useTranslation';
import { useToast } from '../components/ToastHost';
import { localizeTaskLabel } from '../lib/localizeTaskLabel';
import { createPhotoShareLink } from '../services/photosApi';
import { cn } from '@/lib/utils';
import { useEventBranding } from '../context/EventBrandingContext';
import ShareSheet from '../components/ShareSheet';
import { FADE_SCALE, FADE_UP, STAGGER_FAST, getMotionContainerProps, getMotionItemProps, prefersReducedMotion } from '../lib/motion';
import PullToRefresh from '../components/PullToRefresh';

const allGalleryFilters: GalleryFilter[] = ['latest', 'popular', 'mine', 'photobooth'];
type GalleryPhoto = {
  id: number;
  likes_count?: number | null;
  created_at?: string | null;
  ingest_source?: string | null;
  session_id?: string | null;
  task_id?: number | null;
  task_title?: string | null;
  emotion_id?: number | null;
  emotion_name?: string | null;
  thumbnail_path?: string | null;
  file_path?: string | null;
  title?: string | null;
  uploader_name?: string | null;
};

const normalizeImageUrl = (src?: string | null) => {
  if (!src) {
    return '';
  }

  if (/^https?:/i.test(src)) {
    return src;
  }

  let cleanPath = src.replace(/^\/+/g, '').replace(/\/+/g, '/');
  if (!cleanPath.startsWith('storage/')) {
    cleanPath = `storage/${cleanPath}`;
  }

  return `/${cleanPath}`.replace(/\/+/g, '/');
};

export default function GalleryPage() {
  const { token } = useParams<{ token?: string }>();
  const { t, locale } = useTranslation();
  const { branding } = useEventBranding();
  const { photos, loading, newCount, acknowledgeNew, refreshNow } = usePollGalleryDelta(token ?? '', locale);
  const [searchParams, setSearchParams] = useSearchParams();
  const photoIdParam = searchParams.get('photoId');
  const modeParam = searchParams.get('mode');
  const radius = branding.buttons?.radius ?? 12;
  const buttonStyle = branding.buttons?.style ?? 'filled';
  const linkColor = branding.buttons?.linkColor ?? branding.secondaryColor;
  const bodyFont = branding.typography?.body ?? branding.fontFamily ?? undefined;
  const headingFont = branding.typography?.heading ?? branding.fontFamily ?? undefined;
  const motionEnabled = !prefersReducedMotion();
  const containerMotion = getMotionContainerProps(motionEnabled, STAGGER_FAST);
  const fadeUpMotion = getMotionItemProps(motionEnabled, FADE_UP);
  const fadeScaleMotion = getMotionItemProps(motionEnabled, FADE_SCALE);
  const gridMotion = getMotionContainerProps(motionEnabled, STAGGER_FAST);
  const [filter, setFilterState] = React.useState<GalleryFilter>('latest');
  const [currentPhotoIndex, setCurrentPhotoIndex] = React.useState<number | null>(null);
  const [hasOpenedPhoto, setHasOpenedPhoto] = useState(false);

  const [event, setEvent] = useState<EventData | null>(null);
  const [eventLoading, setEventLoading] = useState(true);
  const toast = useToast();
  const [shareTargetId, setShareTargetId] = React.useState<number | null>(null);
  const numberFormatter = React.useMemo(() => new Intl.NumberFormat(locale), [locale]);
  const [shareSheet, setShareSheet] = React.useState<{ photo: GalleryPhoto | null; url: string | null; loading: boolean }>({
    photo: null,
    url: null,
    loading: false,
  });

  const typedPhotos = photos as GalleryPhoto[];
  const showPhotoboothFilter = React.useMemo(
    () => Boolean(event?.photobooth_enabled) || typedPhotos.some((p) => p.ingest_source === 'photobooth'),
    [event?.photobooth_enabled, typedPhotos],
  );
  const allowedGalleryFilters = React.useMemo<GalleryFilter[]>(
    () => (showPhotoboothFilter ? allGalleryFilters : ['latest', 'popular', 'mine']),
    [showPhotoboothFilter],
  );
  const parseGalleryFilter = React.useCallback(
    (value: string | null): GalleryFilter =>
      allowedGalleryFilters.includes(value as GalleryFilter) ? (value as GalleryFilter) : 'latest',
    [allowedGalleryFilters],
  );

  useEffect(() => {
    setFilterState(parseGalleryFilter(modeParam));
  }, [modeParam, parseGalleryFilter]);

  const setFilter = React.useCallback((next: GalleryFilter) => {
    setFilterState(next);
    const params = new URLSearchParams(searchParams);
    params.set('mode', next);
    setSearchParams(params, { replace: true });
  }, [searchParams, setSearchParams]);

  useEffect(() => {
    if (filter === 'photobooth' && !showPhotoboothFilter) {
      setFilter('latest');
    }
  }, [filter, showPhotoboothFilter, setFilter]);

  // Auto-open lightbox if photoId in query params
  useEffect(() => {
    if (photoIdParam && photos.length > 0 && currentPhotoIndex === null && !hasOpenedPhoto) {
      const index = typedPhotos.findIndex((photo) => photo.id === parseInt(photoIdParam, 10));
      if (index !== -1) {
        setCurrentPhotoIndex(index);
        setHasOpenedPhoto(true);
      }
    }
  }, [typedPhotos, photos.length, photoIdParam, currentPhotoIndex, hasOpenedPhoto]);

  // Load event and package info
  const loadEventData = React.useCallback(async () => {
    if (!token) return;
    try {
      setEventLoading(true);
      const eventData = await fetchEvent(token);
      setEvent(eventData);
    } catch (err) {
      console.error('Failed to load event data', err);
    } finally {
      setEventLoading(false);
    }
  }, [token]);

  useEffect(() => {
    void loadEventData();
  }, [loadEventData]);

  const handleRefresh = React.useCallback(async () => {
    await Promise.all([refreshNow(), loadEventData()]);
    acknowledgeNew();
  }, [acknowledgeNew, loadEventData, refreshNow]);

  const myPhotoIds = React.useMemo(() => {
    try {
      const raw = localStorage.getItem('my-photo-ids');
      return new Set<number>(raw ? JSON.parse(raw) : []);
    } catch { return new Set<number>(); }
  }, []);

  const list = React.useMemo(() => {
    let arr = typedPhotos.slice();
    if (filter === 'popular') {
      arr.sort((a, b) => (b.likes_count ?? 0) - (a.likes_count ?? 0));
    } else if (filter === 'mine') {
      arr = arr.filter((p) => myPhotoIds.has(p.id));
    } else if (filter === 'photobooth') {
      arr = arr.filter((p) => p.ingest_source === 'photobooth');
      arr.sort((a, b) => new Date(b.created_at ?? 0).getTime() - new Date(a.created_at ?? 0).getTime());
    } else {
      arr.sort((a, b) => new Date(b.created_at ?? 0).getTime() - new Date(a.created_at ?? 0).getTime());
    }
    return arr;
  }, [typedPhotos, filter, myPhotoIds]);
  const [liked, setLiked] = React.useState<Set<number>>(new Set());
  const [counts, setCounts] = React.useState<Record<number, number>>({});

  async function onLike(id: number) {
    if (liked.has(id)) return;
    setLiked(new Set(liked).add(id));
    try {
      const c = await likePhoto(id);
      setCounts((m) => ({ ...m, [id]: c }));
      // keep a simple record of liked items
      try {
        const raw = localStorage.getItem('liked-photo-ids');
        const arr: number[] = raw ? JSON.parse(raw) : [];
        if (!arr.includes(id)) localStorage.setItem('liked-photo-ids', JSON.stringify([...arr, id]));
      } catch (error) {
        console.warn('Failed to persist liked-photo-ids', error);
      }
    } catch (error) {
      console.warn('Like failed', error);
      const s = new Set(liked); s.delete(id); setLiked(s);
    }
  }

  const buildShareText = (fallback?: string) => {
    const eventName = event?.name ?? fallback ?? 'Fotospiel';
    const base = t('share.shareText', 'Schau dir diesen Moment bei Fotospiel an.');
    return `${eventName} – ${base}`;
  };

  async function onShare(photo: GalleryPhoto) {
    if (!token) return;
    setShareSheet({ photo, url: null, loading: true });
    setShareTargetId(photo.id);
    try {
      const url = await ensureShareUrl(photo);
      setShareSheet({ photo, url, loading: false });
    } catch (error) {
      console.error('share failed', error);
      toast.push({ text: t('share.error', 'Teilen fehlgeschlagen'), type: 'error' });
      setShareSheet({ photo: null, url: null, loading: false });
    } finally {
      setShareTargetId(null);
    }
  }

  async function ensureShareUrl(photo: GalleryPhoto): Promise<string> {
    if (!token) throw new Error('missing token');
    const payload = await createPhotoShareLink(token, photo.id);
    return payload.url;
  }

  function shareNative(url?: string | null) {
    if (!shareSheet.photo || !url) return;
    const localizedTask = localizeTaskLabel(shareSheet.photo.task_title ?? null, locale);
    const data: ShareData = {
      title: localizedTask ?? event?.name ?? t('share.title', 'Geteiltes Foto'),
      text: buildShareText(),
      url,
    };
    if (navigator.share && (!navigator.canShare || navigator.canShare(data))) {
      navigator.share(data).catch(() => {
        // user cancelled; no toast
      });
      setShareSheet({ photo: null, url: null, loading: false });
      return;
    }
    void copyLink(url);
  }

  function shareWhatsApp(url?: string) {
    if (!url) return;
    const text = `${buildShareText()} ${url}`;
    const waUrl = `https://wa.me/?text=${encodeURIComponent(text)}`;
    window.open(waUrl, '_blank', 'noopener');
    setShareSheet({ photo: null, url: null, loading: false });
  }

  function shareMessages(url?: string) {
    if (!url) return;
    const text = `${buildShareText()} ${url}`;
    const smsUrl = `sms:?&body=${encodeURIComponent(text)}`;
    window.open(smsUrl, '_blank', 'noopener');
    setShareSheet({ photo: null, url: null, loading: false });
  }

  async function copyLink(url?: string | null) {
    if (!url) return;
    try {
      await navigator.clipboard?.writeText(url);
      toast.push({ text: t('share.copySuccess', 'Link kopiert!') });
    } catch {
      toast.push({ text: t('share.copyError', 'Link konnte nicht kopiert werden.'), type: 'error' });
    } finally {
      setShareSheet({ photo: null, url: null, loading: false });
    }
  }

  function closeShareSheet() {
    setShareSheet({ photo: null, url: null, loading: false });
  }

  if (!token) {
    return (
      <Page title={t('galleryPage.title', 'Galerie')}>
        <p>{t('galleryPage.eventNotFound', 'Event nicht gefunden.')}</p>
      </Page>
    );
  }

  if (eventLoading) {
    return (
      <Page title={t('galleryPage.title', 'Galerie')}>
        <p>{t('galleryPage.loadingEvent', 'Lade Event-Info...')}</p>
      </Page>
    );
  }

  const newPhotosBadgeText = t('galleryPage.badge.newPhotos', {
    count: numberFormatter.format(newCount),
  }, `${newCount} neue Fotos`);
  const badgeEmphasisClass = newCount > 0
    ? 'border border-pink-200 bg-pink-500/15 text-pink-600'
    : 'border border-transparent bg-muted text-muted-foreground';

  return (
    <Page title="">
      <PullToRefresh
        onRefresh={handleRefresh}
        pullLabel={t('common.pullToRefresh')}
        releaseLabel={t('common.releaseToRefresh')}
        refreshingLabel={t('common.refreshing')}
      >
        <motion.div className="space-y-2" style={bodyFont ? { fontFamily: bodyFont } : undefined} {...containerMotion}>
          <motion.div className="flex items-center gap-3" {...fadeUpMotion}>
            <div className="flex h-10 w-10 items-center justify-center rounded-full bg-pink-500/10 text-pink-500" style={{ borderRadius: radius }}>
              <ImageIcon className="h-5 w-5" aria-hidden />
            </div>
            <div>
              <h1 className="text-2xl font-semibold text-foreground" style={headingFont ? { fontFamily: headingFont } : undefined}>{t('galleryPage.title')}</h1>
              <p className="text-sm text-muted-foreground">{t('galleryPage.subtitle')}</p>
            </div>

            {newCount > 0 ? (
              <button
                type="button"
                onClick={acknowledgeNew}
                className={`inline-flex items-center rounded-full px-3 py-1 text-xs font-semibold transition ${badgeEmphasisClass}`}
                style={{ borderRadius: radius }}
              >
                {newPhotosBadgeText}
              </button>
            ) : (
              <span className={`inline-flex items-center rounded-full px-3 py-1 text-xs font-semibold ${badgeEmphasisClass}`} style={{ borderRadius: radius }}>
                {newPhotosBadgeText}
              </span>
            )}
          </motion.div>
        </motion.div>

        <motion.div {...fadeUpMotion}>
          <FiltersBar
            value={filter}
            onChange={setFilter}
            className="mt-2"
            showPhotobooth={showPhotoboothFilter}
            styleOverride={{ borderRadius: radius, fontFamily: headingFont }}
          />
        </motion.div>
        {loading && (
          <motion.p className="px-4" style={bodyFont ? { fontFamily: bodyFont } : undefined} {...fadeUpMotion}>
            {t('galleryPage.loading', 'Lade…')}
          </motion.p>
        )}
        <motion.div className="grid grid-cols-2 gap-2 px-2 pb-16 sm:grid-cols-3 lg:grid-cols-4" {...gridMotion}>
          {list.map((p: GalleryPhoto) => {
            const imageUrl = normalizeImageUrl(p.thumbnail_path || p.file_path);
            const createdLabel = p.created_at
              ? new Date(p.created_at).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
              : t('galleryPage.photo.justNow', 'Gerade eben');
            const likeCount = counts[p.id] ?? (p.likes_count || 0);
            const localizedTaskTitle = localizeTaskLabel(p.task_title ?? null, locale);
            const altSuffix = localizedTaskTitle
              ? t('galleryPage.photo.altTaskSuffix', { task: localizedTaskTitle })
              : '';
            const altText = t('galleryPage.photo.alt', { id: p.id, suffix: altSuffix }, `Foto ${p.id}${altSuffix}`);

            const openPhoto = () => {
              const index = list.findIndex((photo) => photo.id === p.id);
              setCurrentPhotoIndex(index >= 0 ? index : null);
            };

            return (
              <motion.div
                key={p.id}
                role="button"
                tabIndex={0}
                onClick={openPhoto}
                onKeyDown={(e) => {
                  if (e.key === 'Enter') {
                    openPhoto();
                  }
                }}
                className="group relative overflow-hidden border border-white/20 bg-gray-950 text-white shadow-lg focus:outline-none focus-visible:ring-2 focus-visible:ring-pink-400"
                style={{ borderRadius: radius }}
                {...fadeScaleMotion}
              >
                <img
                  src={imageUrl}
                  alt={altText}
                  className="aspect-[3/4] w-full object-cover transition duration-500 group-hover:scale-105"
                  onError={(e) => {
                    (e.target as HTMLImageElement).src = 'data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTAwIiBoZWlnaHQ9IjEwMCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cmVjdCB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiBmaWxsPSIjRjNGNEY2Ii8+PHRleHQgeD0iNTAlIiB5PSI1MCUiIGZvbnQtZmFtaWx5PSJBcmlhbCIgZm9udC1zaXplPSIxNCIgZmlsbD0iIzk5OSIgdGV4dC1hbmNob3I9Im1pZGRsZSIgZHk9Ii4zZW0iPk5vIEltYWdlPC90ZXh0Pjwvc3ZnPg==';
                  }}
                  loading="lazy"
                />
                <div className="pointer-events-none absolute inset-0 bg-gradient-to-t from-black/85 via-black/20 to-transparent" aria-hidden />
                <div className="absolute inset-x-0 bottom-0 space-y-2 px-4 pb-4" style={bodyFont ? { fontFamily: bodyFont } : undefined}>
                  {localizedTaskTitle && <p className="text-sm font-medium leading-tight line-clamp-2 text-white" style={headingFont ? { fontFamily: headingFont } : undefined}>{localizedTaskTitle}</p>}
                  <div className="flex items-center justify-between text-xs text-white/90" style={bodyFont ? { fontFamily: bodyFont } : undefined}>
                    <span className="truncate">{createdLabel}</span>
                    <span className="ml-3 truncate text-right">{p.uploader_name || t('galleryPage.photo.anonymous', 'Gast')}</span>
                  </div>
                </div>
                <div className="absolute right-3 top-3 z-10 flex items-center gap-2">
                  <button
                    type="button"
                    onClick={(e) => {
                      e.stopPropagation();
                      onShare(p);
                    }}
                    className={cn(
                      'flex h-9 w-9 items-center justify-center border text-white transition backdrop-blur',
                      shareTargetId === p.id ? 'opacity-60' : 'hover:bg-white/10'
                    )}
                    aria-label={t('galleryPage.photo.shareAria', 'Foto teilen')}
                    disabled={shareTargetId === p.id}
                    style={{
                      borderRadius: radius,
                      background: buttonStyle === 'outline' ? 'transparent' : '#00000066',
                      border: buttonStyle === 'outline' ? `1px solid ${linkColor}` : '1px solid rgba(255,255,255,0.4)',
                      color: buttonStyle === 'outline' ? linkColor : undefined,
                    }}
                  >
                    <Share2 className="h-4 w-4" aria-hidden />
                  </button>
                  <button
                    type="button"
                    onClick={(e) => {
                      e.stopPropagation();
                      onLike(p.id);
                    }}
                    className={cn(
                      'flex items-center gap-1 px-3 py-1 text-sm font-medium transition backdrop-blur',
                      liked.has(p.id) ? 'text-pink-300' : 'text-white'
                    )}
                    aria-label={t('galleryPage.photo.likeAria', 'Foto liken')}
                    style={{
                      borderRadius: radius,
                      background: buttonStyle === 'outline' ? 'transparent' : '#00000066',
                      border: buttonStyle === 'outline' ? `1px solid ${linkColor}` : '1px solid rgba(255,255,255,0.4)',
                      color: buttonStyle === 'outline' ? linkColor : undefined,
                    }}
                  >
                    <Heart className={`h-4 w-4 ${liked.has(p.id) ? 'fill-current' : ''}`} aria-hidden />
                    {likeCount}
                  </button>
                </div>
              </motion.div>
            );
          })}
          {list.length === 0 && Array.from({ length: 6 }).map((_, idx) => (
            <motion.div
              key={`placeholder-${idx}`}
              className="relative overflow-hidden border border-muted/40 bg-[var(--guest-surface,#f7f7f7)] shadow-sm"
              style={{ borderRadius: radius }}
              {...fadeScaleMotion}
            >
              <div className="absolute inset-0 bg-gradient-to-br from-white/60 via-white/30 to-transparent dark:from-white/5 dark:via-white/0" aria-hidden />
              <div className="flex aspect-[3/4] items-center justify-center gap-2 p-4 text-muted-foreground/70">
                <ImageIcon className="h-6 w-6" aria-hidden />
                <div className="h-2 w-10 rounded-full bg-muted/40" />
              </div>
              <div className="absolute inset-0 animate-pulse bg-white/30 dark:bg-white/5" aria-hidden />
            </motion.div>
          ))}
        </motion.div>
      </PullToRefresh>
      {currentPhotoIndex !== null && list.length > 0 && (
        <PhotoLightbox
          photos={list}
          currentIndex={currentPhotoIndex}
          onClose={() => setCurrentPhotoIndex(null)}
          onIndexChange={(index: number) => setCurrentPhotoIndex(index)}
          token={token}
          eventName={event?.name ?? null}
        />
      )}

      <ShareSheet
        open={Boolean(shareSheet.photo)}
        photoId={shareSheet.photo?.id ?? null}
        eventName={event?.name ?? null}
        url={shareSheet.url}
        loading={shareSheet.loading}
        onClose={closeShareSheet}
        onShareNative={() => shareNative(shareSheet.url)}
        onShareWhatsApp={() => shareWhatsApp(shareSheet.url)}
        onShareMessages={() => shareMessages(shareSheet.url)}
        onCopyLink={() => copyLink(shareSheet.url)}
        radius={radius}
        bodyFont={bodyFont}
        headingFont={headingFont}
      />
    </Page>
  );
}