/**
 * Jedna strona feedu Swipe: klip na caly ekran, poster pod spodem, nakladka z tworca
 * i tagami, kolumna przyciskow po prawej, pasek postepu na dole.
 *
 * Komorka NIE tworzy playera. Player (jeden z dwoch wspoldzielonych, patrz SwipeScreen)
 * przychodzi w propsach tylko do aktywnej strony; nieaktywna renderuje sam poster, zeby
 * pager z kilkuset stronami nie trzymal kilkuset instancji ExoPlayera.
 *
 * Gesty (react-native-gesture-handler, bez reanimated, callbacki na watku JS):
 *   tap          → dzwiek wl./wyl. (czeka, az double-tap padnie),
 *   double-tap   → serce (ulubione) + wybuch serca + haptyka,
 *   przytrzymanie → 2x do puszczenia,
 *   przesuniecie w lewo → arkusz „nie interesuje" (pion zostaje dla pagera).
 *
 * Dolny pasek zakladek wisi nad feedem. Podpis, kolumna przyciskow i pasek postepu jada
 * razem z nim (ta sama wartosc Animated `barHidden`): gdy pasek jest widoczny, stoja nad
 * nim, gdy sie schowa, schodza na dol ekranu. Wczesniej pasek zaslanial podpis, tagi i
 * postep (uwaga Jana 2026-09-15).
 */
import { MaterialCommunityIcons } from '@expo/vector-icons';
import { Image } from 'expo-image';
import type { VideoPlayer } from 'expo-video';
import { VideoView } from 'expo-video';
import React from 'react';
import { Animated, Pressable, StyleSheet, Text, View } from 'react-native';
import { Gesture, GestureDetector } from 'react-native-gesture-handler';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

import { BOTTOM_BAR_HEIGHT, barHidden } from '../../lib/bottomBar';
import { fonts, theme } from '../../theme';
import type { ClipFeedItem } from '../../types';

interface Props {
  item: ClipFeedItem;
  active: boolean;
  player: VideoPlayer | null;
  muted: boolean;
  liked: boolean;
  onToggleMute: () => void;
  onLike: () => void;
  onNotInterested: () => void;
  onTagPress?: (tag: string) => void;
  onCreatorPress?: (creator: string) => void;
}

function ClipCellBase({ item, active, player, muted, liked, onToggleMute, onLike, onNotInterested, onTagPress, onCreatorPress }: Props) {
  const clip = item.clip;
  const [progress, setProgress] = React.useState(0);
  const [ready, setReady] = React.useState(false);
  const heart = React.useRef(new Animated.Value(0)).current;
  const insets = useSafeAreaInsets();
  const lift = React.useMemo(
    () =>
      barHidden.interpolate({
        inputRange: [0, 1],
        outputRange: [-(BOTTOM_BAR_HEIGHT + insets.bottom), -insets.bottom],
      }),
    [insets.bottom],
  );

  // Postep i gotowosc tylko dla aktywnej strony z playerem.
  React.useEffect(() => {
    if (!active || !player) {
      setProgress(0);
      setReady(false);
      return;
    }
    const subTime = player.addListener('timeUpdate', (e) => {
      const d = player.duration || clip.duration_sec || 0;
      setProgress(d > 0 ? Math.min(1, e.currentTime / d) : 0);
    });
    const subStatus = player.addListener('statusChange', (e) => {
      setReady(e.status === 'readyToPlay');
    });
    setReady(player.status === 'readyToPlay');
    return () => {
      subTime.remove();
      subStatus.remove();
    };
  }, [active, player, clip.duration_sec]);

  const burst = React.useCallback(() => {
    heart.setValue(0);
    Animated.sequence([
      Animated.spring(heart, { toValue: 1, useNativeDriver: true, speed: 30, bounciness: 12 }),
      Animated.timing(heart, { toValue: 0, duration: 350, delay: 250, useNativeDriver: true }),
    ]).start();
  }, [heart]);

  const doubleTap = React.useMemo(
    () =>
      Gesture.Tap()
        .numberOfTaps(2)
        .maxDelay(280)
        .onEnd((_e, success) => {
          if (!success) return;
          burst();
          onLike();
        })
        .runOnJS(true),
    [burst, onLike],
  );
  const singleTap = React.useMemo(
    () =>
      Gesture.Tap()
        .numberOfTaps(1)
        .maxDuration(250)
        .requireExternalGestureToFail(doubleTap)
        .onEnd((_e, success) => {
          if (success) onToggleMute();
        })
        .runOnJS(true),
    [doubleTap, onToggleMute],
  );
  const longPress = React.useMemo(
    () =>
      Gesture.LongPress()
        .minDuration(220)
        .maxDistance(30)
        .onStart(() => {
          if (player) player.playbackRate = 2.0;
        })
        .onFinalize(() => {
          if (player) player.playbackRate = 1.0;
        })
        .runOnJS(true),
    [player],
  );
  const swipeLeft = React.useMemo(
    () =>
      Gesture.Pan()
        .activeOffsetX([-40, 40])
        .failOffsetY([-15, 15])
        .onEnd((e) => {
          if (e.translationX < -80) onNotInterested();
        })
        .runOnJS(true),
    [onNotInterested],
  );
  const gestures = React.useMemo(
    () => Gesture.Race(swipeLeft, Gesture.Exclusive(doubleTap, singleTap), longPress),
    [swipeLeft, doubleTap, singleTap, longPress],
  );

  const poster = clip.poster_url || clip.thumb_url || undefined;
  const tags = clip.tags.slice(0, 4);

  return (
    // Gesty (tap = dzwiek, double-tap = serce, przytrzymanie = 2x, w lewo = „nie
    // interesuje") lapie TYLKO warstwa wideo. Wczesniej GestureDetector obejmowal cala
    // komorke razem z przyciskami, wiec tapniecie serduszka bylo jednoczesnie tapnieciem
    // w ekran i przelaczalo dzwiek (zgloszenie Jana 2026-09-16).
    <View style={styles.root}>
      <GestureDetector gesture={gestures}>
        <View style={StyleSheet.absoluteFill} collapsable={false}>
          {poster ? (
            <Image source={{ uri: poster }} style={StyleSheet.absoluteFill} contentFit="cover" transition={0} />
          ) : null}
          {active && player ? (
            <VideoView
              player={player}
              style={[StyleSheet.absoluteFill, !ready && { opacity: 0 }]}
              nativeControls={false}
              contentFit="cover"
              allowsPictureInPicture={false}
            />
          ) : null}

          {/* Wybuch serca po double-tapie */}
          <Animated.View
            pointerEvents="none"
            style={[
              styles.heartBurst,
              {
                opacity: heart,
                transform: [{ scale: Animated.add(0.4, Animated.multiply(heart, 0.9)) }],
              },
            ]}
          >
            <MaterialCommunityIcons name="heart" size={120} color="#fff" />
          </Animated.View>
        </View>
      </GestureDetector>

      <Animated.View style={[StyleSheet.absoluteFill, { transform: [{ translateY: lift }] }]} pointerEvents="box-none">
          {/* Kolumna przyciskow */}
          <View style={styles.rail} pointerEvents="box-none">
            <Pressable
              onPress={() => {
                burst();
                onLike();
              }}
              style={styles.railBtn}
              accessibilityLabel={liked ? 'Remove from favorites' : 'Add to favorites'}
            >
              <MaterialCommunityIcons name={liked ? 'heart' : 'heart-outline'} size={30} color={liked ? theme.accentText : '#fff'} />
            </Pressable>
            <Pressable onPress={onToggleMute} style={styles.railBtn} accessibilityLabel={muted ? 'Unmute' : 'Mute'}>
              <MaterialCommunityIcons
                name={clip.has_audio ? (muted ? 'volume-off' : 'volume-high') : 'volume-variant-off'}
                size={28}
                color={clip.has_audio ? '#fff' : '#9a9a9a'}
              />
            </Pressable>
            <Pressable onPress={onNotInterested} style={styles.railBtn} accessibilityLabel="Not interested">
              <MaterialCommunityIcons name="thumb-down-outline" size={26} color="#fff" />
            </Pressable>
          </View>

          {/* Podpis: tworca, tytul, tagi */}
          <View style={styles.caption} pointerEvents="box-none">
            {/* Nazwa tworcy prowadzi do jego strony (zgloszenie 2026-09-15: „cannot tap
                username"). Bez tworcy (albo bez obslugi) zostaje sam napis. */}
            <Pressable
              style={styles.creatorRow}
              disabled={!clip.creator || !onCreatorPress}
              onPress={() => clip.creator && onCreatorPress?.(clip.creator)}
              accessibilityRole={clip.creator && onCreatorPress ? 'link' : undefined}
              accessibilityLabel={clip.creator ? `Clips by ${clip.creator}` : undefined}
              hitSlop={8}
            >
              <Text style={styles.creator} numberOfLines={1}>
                {clip.creator ? `@${clip.creator}` : clip.source}
              </Text>
              {clip.creator_verified ? (
                <MaterialCommunityIcons name="check-decagram" size={15} color={theme.accentSecondary} style={{ marginLeft: 4 }} />
              ) : null}
              {clip.creator && onCreatorPress ? (
                <MaterialCommunityIcons name="chevron-right" size={18} color="#fff" style={{ marginLeft: 2, opacity: 0.8 }} />
              ) : null}
              {item.is_fresh ? <Text style={styles.fresh}>NEW</Text> : null}
            </Pressable>
            {clip.title ? (
              <Text style={styles.title} numberOfLines={2}>
                {clip.title}
              </Text>
            ) : null}
            {tags.length ? (
              <View style={styles.tagsRow}>
                {tags.map((t) => (
                  <Pressable key={t} onPress={() => onTagPress?.(t)} style={styles.tagChip}>
                    <Text style={styles.tagText}>#{t}</Text>
                  </Pressable>
                ))}
              </View>
            ) : null}
          </View>

          {/* Pasek postepu */}
          <View style={styles.progressTrack} pointerEvents="none">
            <View style={[styles.progressFill, { width: `${Math.round(progress * 100)}%` }]} />
          </View>
      </Animated.View>
    </View>
  );
}

export const ClipCell = React.memo(ClipCellBase);

const styles = StyleSheet.create({
  root: { flex: 1, backgroundColor: '#000' },
  heartBurst: {
    position: 'absolute',
    left: 0,
    right: 0,
    top: 0,
    bottom: 0,
    alignItems: 'center',
    justifyContent: 'center',
  },
  // Nad dolnym paskiem pilnuje tego `lift`, wiec kolumna stoi na wysokosci podpisu.
  rail: { position: 'absolute', right: 8, bottom: 20, alignItems: 'center' },
  railBtn: {
    width: 48,
    height: 48,
    borderRadius: 24,
    alignItems: 'center',
    justifyContent: 'center',
    marginTop: 10,
    backgroundColor: 'rgba(0,0,0,0.28)',
  },
  caption: { position: 'absolute', left: 14, right: 72, bottom: 24 },
  creatorRow: { flexDirection: 'row', alignItems: 'center' },
  creator: { color: '#fff', fontFamily: fonts.display, fontSize: 16, textShadowColor: 'rgba(0,0,0,0.6)', textShadowRadius: 4 },
  fresh: {
    marginLeft: 8,
    color: '#fff',
    backgroundColor: theme.accent,
    fontFamily: fonts.mono,
    fontSize: 10,
    paddingHorizontal: 6,
    paddingVertical: 1,
    borderRadius: 4,
  },
  title: { color: '#eaeaea', fontFamily: fonts.body, fontSize: 14, marginTop: 4, textShadowColor: 'rgba(0,0,0,0.6)', textShadowRadius: 4 },
  tagsRow: { flexDirection: 'row', flexWrap: 'wrap', marginTop: 8 },
  tagChip: {
    backgroundColor: 'rgba(255,255,255,0.14)',
    borderRadius: 12,
    paddingHorizontal: 9,
    paddingVertical: 3,
    marginRight: 6,
    marginBottom: 6,
  },
  tagText: { color: '#fff', fontFamily: fonts.medium, fontSize: 12 },
  progressTrack: { position: 'absolute', left: 0, right: 0, bottom: 0, height: 3, backgroundColor: 'rgba(255,255,255,0.18)' },
  progressFill: { height: 3, backgroundColor: theme.accentText },
});