import { LinearGradient } from 'expo-linear-gradient';
import { router } from 'expo-router';
import { useEffect, useRef, useState } from 'react';
import { Linking, Pressable, StyleSheet, Text, View } from 'react-native';
import Animated, {
  FadeIn,
  FadeOut,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withSpring,
} from 'react-native-reanimated';
import { SERVICE_LABELS, timeAgo, type NowPlayingDTO, type StreamingService } from '@musicshare/shared';
import { successHaptic, tapHaptic } from '@/lib/haptics';
import { OnHero, colors, fonts, heroGradient, panelShadow, radius, space } from '@/lib/theme';
import { Avatar } from './Avatar';
import { Equalizer } from './Equalizer';
import { Lyrics } from './Lyrics';
import { ProgressBar } from './ProgressBar';
import { Reactions } from './Reactions';
import { ServiceLinks, TrackRow } from './TrackCard';

export function NowPlayingCard({
  np,
  preferred,
  showUser = true,
  pinned,
  onTogglePin,
}: {
  np: NowPlayingDTO;
  preferred: StreamingService | null | undefined;
  showUser?: boolean;
  pinned?: boolean;
  onTogglePin?: () => void;
}) {
  // Star "pop" when pinned.
  const star = useSharedValue(1);
  const wasPinned = useRef(pinned);
  useEffect(() => {
    if (pinned && !wasPinned.current) star.set(withSequence(withSpring(1.6, { damping: 6, stiffness: 400 }), withSpring(1)));
    wasPinned.current = pinned;
  }, [pinned, star]);
  const starStyle = useAnimatedStyle(() => ({ transform: [{ scale: star.value }] }));
  const [expanded, setExpanded] = useState(false);
  const toggle = () => {
    tapHaptic();
    setExpanded((v) => !v);
  };

  const togglePin = () => {
    if (pinned) tapHaptic();
    else successHaptic();
    onTogglePin?.();
  };

  // Your own song gets the gradient "hero" card; friends' songs sit on plain panels.
  const hero = !showUser;
  return (
    <OnHero.Provider value={hero}>
    <View style={[styles.card, hero && styles.heroCard, pinned && styles.pinned]}>
      {hero && <LinearGradient colors={heroGradient} start={{ x: 0, y: 0 }} end={{ x: 1, y: 1 }} style={StyleSheet.absoluteFill} />}

      <View style={styles.header}>
        {showUser && (
          <Pressable style={styles.user} onPress={() => router.push(`/u/${np.user.username}`)} accessibilityRole="link">
            <Avatar user={np.user} size={26} live={np.isPlaying} />
            <Text style={styles.name} numberOfLines={1}>
              {np.user.displayName ?? np.user.username}
            </Text>
          </Pressable>
        )}
        <View style={styles.statusRow}>
          {np.isPlaying && <Equalizer playing color={hero ? '#ffffff' : colors.live} />}
          <Text style={[styles.status, hero && styles.heroText, np.isPlaying && (hero ? styles.heroLive : styles.live)]} numberOfLines={1}>
            {np.isPlaying ? 'Listening now' : `Played ${timeAgo(np.updatedAt)}`}
            <Text
              style={[styles.via, hero && styles.heroText, np.sourceUrl && styles.viaLink]}
              onPress={np.sourceUrl ? () => Linking.openURL(np.sourceUrl!) : undefined}>
              {' · '}
              {np.sourceApp ?? SERVICE_LABELS[np.source]}
            </Text>
          </Text>
          {onTogglePin && (
            <Pressable
              onPress={togglePin}
              hitSlop={12}
              accessibilityRole="button"
              accessibilityLabel={pinned ? 'Unpin from top of feed' : 'Pin to top of feed'}
              accessibilityState={{ selected: pinned }}>
              <Animated.Text style={[styles.pin, pinned && styles.pinOn, starStyle]}>{pinned ? '★' : '☆'}</Animated.Text>
            </Pressable>
          )}
        </View>
      </View>

      <Animated.View key={np.track.id} entering={FadeIn.duration(250)} exiting={FadeOut.duration(200)}>
        <TrackRow track={np.track} preferred={preferred} expanded={expanded} onToggle={toggle} />
      </Animated.View>
      <ProgressBar np={np} compact={!expanded} />
      <Reactions listenId={np.listenId} reactions={np.reactions} ownerId={np.user.id} commentCount={np.commentCount ?? 0} />
      {expanded && (
        <Animated.View entering={FadeIn.duration(200)} exiting={FadeOut.duration(120)} style={styles.details}>
          <ServiceLinks track={np.track} preferred={preferred} />
          <Lyrics track={np.track} np={np} />
        </Animated.View>
      )}
    </View>
    </OnHero.Provider>
  );
}

const styles = StyleSheet.create({
  card: {
    borderRadius: radius.lg,
    padding: space.md + 4,
    gap: space.sm + 2,
    backgroundColor: colors.surface,
    borderWidth: 1,
    borderColor: 'transparent',
    ...panelShadow,
  },
  heroCard: { overflow: 'hidden', shadowColor: colors.accent, shadowOpacity: 0.4, shadowRadius: 22 },
  heroText: { color: 'rgba(255,255,255,0.85)' },
  heroLive: { color: '#ffffff', fontFamily: fonts.bodyMedium },
  details: { gap: space.md },
  pinned: { borderColor: colors.accentLine },
  header: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between', gap: space.sm },
  user: { flexDirection: 'row', alignItems: 'center', gap: space.sm, flexShrink: 1 },
  name: { color: colors.text, fontFamily: fonts.bodyMedium, fontSize: 14.5, flexShrink: 1 },
  statusRow: { flexDirection: 'row', alignItems: 'center', gap: space.xs + 2, flexShrink: 1 },
  status: { color: colors.muted, fontSize: 12.5, fontFamily: fonts.body, flexShrink: 1 },
  live: { color: colors.live, fontFamily: fonts.bodyMedium },
  via: { color: colors.muted, fontFamily: fonts.body },
  viaLink: { textDecorationLine: 'underline' },
  pin: { color: colors.muted, fontSize: 21, marginLeft: space.xs },
  pinOn: { color: colors.accent, textShadowColor: 'rgba(255,79,139,0.6)', textShadowRadius: 10 },
});