import { useRouter } from 'expo-router';
import { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { Pressable, Text, View, type LayoutChangeEvent } from 'react-native';
import { MusicShareSheet } from '../features/social/Social';
import { ListeningBanner } from '../features/social/Listening';
import { trackShareUrl } from '@pipu/core';

import { useSessionCtx, useUser } from '../lib/session';
import { player } from '../player/controller';
import { usePlayerState } from '../player/hooks';
import { useColors } from '../theme';
import { DownloadButton } from '../ui/downloads';
import { Cover, Icon, Screen, formatDuration } from '../ui/kit';
import { WaveOrb } from '../ui/wave/WaveOrb';

/**
 * Полноэкранный плеер: вид `cover` (крупная обложка) или `wave` (визуализация волны в цветах обложки) — по профилю;
 * прогресс с перемоткой, лайк / дизлайк, скачать, управление.
 */
export default function PlayerScreen() {
  const colors = useColors();
  const { t } = useTranslation();
  const router = useRouter();
  const st = usePlayerState();
  const locked = st.listening?.locked === true;
  const prefs = useUser().ui_prefs;
  const { server } = useSessionCtx();
  const [sharing, setSharing] = useState(false);
  const [barWidth, setBarWidth] = useState(1);
  const track = st.track;

  if (!track) {
    return (
      <Screen>
        <Pressable onPress={() => router.back()} style={{ padding: 16 }} accessibilityRole="button" accessibilityLabel={t('mobile.close_player')}>
          <Icon name="keyboard-arrow-down" size={32} color={colors.text} />
        </Pressable>
      </Screen>
    );
  }
  const duration = st.durationMs || track.duration_ms;
  const progress = duration ? Math.min(st.positionMs / duration, 1) : 0;
  const react = (r: 'like' | 'dislike') => void player.react(track, track.reaction === r ? null : r).catch(() => undefined);
  const share = () => setSharing(true);

  return (
    <Screen>
      {sharing && server && <MusicShareSheet attachment={{ kind: 'track', id: track.id, title: track.title }} url={trackShareUrl(server, track.id)} close={() => setSharing(false)} />}
      <ListeningBanner />
      <View style={{ flex: 1, padding: 24, gap: 24, justifyContent: 'space-between' }}>
        <View style={{ flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between' }}>
          <Pressable onPress={() => router.back()} hitSlop={10} accessibilityRole="button" accessibilityLabel={t('mobile.close_player')}>
            <Icon name="keyboard-arrow-down" size={32} color={colors.text} />
          </Pressable>
          <Text style={{ color: colors.text2, fontSize: 13 }}>{st.wave ? t('wave.title') : t('mobile.now_playing')}</Text>
          <View style={{ flexDirection: 'row', alignItems: 'center', gap: 16 }}>
            <Pressable onPress={() => void share()} disabled={!server || sharing} hitSlop={10} accessibilityRole="button" accessibilityLabel={t('player.share')} accessibilityState={{ disabled: !server || sharing }}>
              <Icon name="share" size={24} color={colors.text} />
            </Pressable>
            <DownloadButton track={track} />
          </View>
        </View>

        <View style={{ alignItems: 'center' }}>
          {prefs.mobile_player === 'wave' ? (
            <WaveOrb
              variant={prefs.wave_variant ?? 'orb'}
              size={280}
              playing={st.playing}
              bpm={track.features?.bpm ?? 100}
              energy={track.features?.energy ?? 0.6}
              colors={track.album.cover_colors}
            >
              <Cover album={track.album} size={96} round />
            </WaveOrb>
          ) : (
            <Cover album={track.album} size={300} />
          )}
        </View>

        <View style={{ gap: 4 }}>
          <Text numberOfLines={2} style={{ color: colors.text, fontSize: 22, fontWeight: '700' }}>
            {track.title}
          </Text>
          <Text numberOfLines={1} style={{ color: colors.text2, fontSize: 15 }}>
            {track.artists.map((a) => a.name).join(', ')}
          </Text>
          <Pressable onPress={() => router.push({ pathname: '/playlists', params: { track: track.id } })}
            accessibilityRole="button" accessibilityLabel={t('playlists.add')}
            style={{ flexDirection: 'row', alignItems: 'center', gap: 8, minHeight: 44, alignSelf: 'flex-start' }}>
            <Icon name="playlist-add" size={24} color={colors.text2} />
            <Text style={{ color: colors.text2 }}>{t('playlists.add')}</Text>
          </Pressable>
        </View>

        <View style={{ gap: 6 }}>
          <Pressable
            onLayout={(e: LayoutChangeEvent) => setBarWidth(e.nativeEvent.layout.width || 1)}
            disabled={locked} onPress={(e) => player.seek((e.nativeEvent.locationX / barWidth) * duration)}
            accessibilityRole="adjustable"
            accessibilityLabel={t('player.progress')}
            accessibilityValue={{ min: 0, max: Math.round(duration / 1000), now: Math.round(st.positionMs / 1000) }}
            accessibilityActions={[{ name: 'increment' }, { name: 'decrement' }]}
            onAccessibilityAction={(e) => player.seek(st.positionMs + (e.nativeEvent.actionName === 'increment' ? 10_000 : -10_000))}
            style={{ height: 24, justifyContent: 'center' }}
          >
            <View style={{ height: 4, borderRadius: 2, backgroundColor: colors.surface3 }}>
              <View style={{ height: 4, borderRadius: 2, width: `${progress * 100}%`, backgroundColor: colors.accent2 }} />
            </View>
          </Pressable>
          <View style={{ flexDirection: 'row', justifyContent: 'space-between' }}>
            <Text style={{ color: colors.text3, fontSize: 12 }}>{formatDuration(st.positionMs)}</Text>
            <Text style={{ color: colors.text3, fontSize: 12 }}>{formatDuration(duration)}</Text>
          </View>
        </View>

        <View style={{ flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between' }}>
          <Pressable onPress={() => react('dislike')} hitSlop={10} accessibilityRole="button" accessibilityLabel={t(track.reaction === 'dislike' ? 'player.undislike' : 'player.dislike')}>
            <Icon name="heart-broken" size={28} color={track.reaction === 'dislike' ? colors.danger : colors.text2} />
          </Pressable>
          <Pressable disabled={locked} onPress={() => void player.prev()} hitSlop={10} accessibilityRole="button" accessibilityLabel={t('player.prev')}>
            <Icon name="skip-previous" size={40} color={colors.text} />
          </Pressable>
          <Pressable
            disabled={locked} onPress={() => player.toggle()}
            accessibilityRole="button"
            accessibilityLabel={t(st.playing ? 'player.pause' : 'player.play')}
            style={{ width: 72, height: 72, borderRadius: 36, backgroundColor: colors.text, alignItems: 'center', justifyContent: 'center' }}
          >
            <Icon name={st.playing ? 'pause' : 'play-arrow'} size={40} color={colors.bg} />
          </Pressable>
          <Pressable disabled={locked} onPress={() => player.next()} hitSlop={10} accessibilityRole="button" accessibilityLabel={t('player.next')}>
            <Icon name="skip-next" size={40} color={colors.text} />
          </Pressable>
          <Pressable onPress={() => react('like')} hitSlop={10} accessibilityRole="button" accessibilityLabel={t(track.reaction === 'like' ? 'player.unlike' : 'player.like')}>
            <Icon name={track.reaction === 'like' ? 'favorite' : 'favorite-border'} size={28} color={track.reaction === 'like' ? colors.accent2 : colors.text2} />
          </Pressable>
        </View>
      </View>
    </Screen>
  );
}