import { useNetInfo } from '@react-native-community/netinfo';
import { Tabs, useRouter } from 'expo-router';
import { useTranslation } from 'react-i18next';
import { Pressable, Text, View } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

import { player } from '../../player/controller';
import { usePlayerState } from '../../player/hooks';
import { useColors } from '../../theme';
import { Cover, Icon, type IconName } from '../../ui/kit';
import { UpdateDialog } from '../../ui/UpdateDialog';

const ICONS: Record<string, IconName> = { index: 'home', search: 'search', collection: 'library-music', profile: 'person' };

export default function TabsLayout() {
  const colors = useColors();
  const { t } = useTranslation();
  const labels: Record<string, string> = {
    index: t('nav.home'),
    search: t('mobile.search'),
    collection: t('nav.collection'),
    profile: t('mobile.profile'),
  };
  const net = useNetInfo();
  return (
    <>
      {net.isConnected === false && <OfflineBanner text={t('mobile.offline')} />}
      <Tabs
        screenOptions={{ headerShown: false, sceneStyle: { backgroundColor: colors.bg } }}
        tabBar={({ state, navigation }) => (
          <View>
            <MiniPlayer />
            <TabBar
              routes={state.routes.map((r) => r.name)}
              active={state.index}
              labels={labels}
              onPress={(name) => navigation.navigate(name)}
            />
          </View>
        )}
      >
        <Tabs.Screen name="index" />
        <Tabs.Screen name="search" />
        <Tabs.Screen name="collection" />
        <Tabs.Screen name="profile" />
      </Tabs>
      <UpdateDialog />
    </>
  );
}

function TabBar({
  routes,
  active,
  labels,
  onPress,
}: {
  routes: string[];
  active: number;
  labels: Record<string, string>;
  onPress: (name: string) => void;
}) {
  const colors = useColors();
  const insets = useSafeAreaInsets();
  return (
    <View
      accessibilityRole="tablist"
      style={{
        flexDirection: 'row',
        paddingBottom: insets.bottom,
        backgroundColor: colors.bg2,
        borderTopWidth: 1,
        borderTopColor: colors.line,
      }}
    >
      {routes.map((name, i) => {
        const on = i === active;
        return (
          <Pressable
            key={name}
            onPress={() => onPress(name)}
            accessibilityRole="tab"
            accessibilityState={{ selected: on }}
            accessibilityLabel={labels[name]}
            style={{ flex: 1, alignItems: 'center', paddingVertical: 8, gap: 2 }}
          >
            <Icon name={ICONS[name] ?? 'circle'} color={on ? colors.accent2 : colors.text3} />
            <Text style={{ fontSize: 11, color: on ? colors.text : colors.text3, fontWeight: on ? '600' : '400' }}>
              {labels[name]}
            </Text>
          </Pressable>
        );
      })}
    </View>
  );
}

/** Мини-плеер над навигацией; нажатие — полноэкранный плеер. */
function MiniPlayer() {
  const colors = useColors();
  const { t } = useTranslation();
  const router = useRouter();
  const st = usePlayerState();
  const track = st.track;
  if (!track) return null;
  const progress = st.durationMs ? Math.min(st.positionMs / st.durationMs, 1) : 0;
  return (
    <Pressable
      onPress={() => router.push('/player')}
      accessibilityRole="button"
      accessibilityLabel={t('mobile.open_player')}
      style={{ backgroundColor: colors.surface, borderTopWidth: 1, borderTopColor: colors.line }}
    >
      <View style={{ height: 2, backgroundColor: colors.surface3 }}>
        <View style={{ height: 2, width: `${progress * 100}%`, backgroundColor: colors.accent2 }} />
      </View>
      <View style={{ flexDirection: 'row', alignItems: 'center', gap: 12, paddingHorizontal: 12, paddingVertical: 8 }}>
        <Cover album={track.album} size={42} />
        <View style={{ flex: 1, minWidth: 0 }}>
          <Text numberOfLines={1} style={{ color: colors.text, fontWeight: '600' }}>
            {track.title}
          </Text>
          <Text numberOfLines={1} style={{ color: colors.text2, fontSize: 12 }}>
            {track.artists.map((a) => a.name).join(', ')}
          </Text>
        </View>
        <Pressable onPress={() => player.toggle()} hitSlop={10} accessibilityRole="button" accessibilityLabel={t(st.playing ? 'player.pause' : 'player.play')}>
          <Icon name={st.playing ? 'pause' : 'play-arrow'} size={32} color={colors.text} />
        </Pressable>
        <Pressable onPress={() => player.next()} hitSlop={10} accessibilityRole="button" accessibilityLabel={t('player.next')}>
          <Icon name="skip-next" size={28} color={colors.text2} />
        </Pressable>
      </View>
    </Pressable>
  );
}

/** Нет сети: доступны «Скачанное» и офлайн-волна. */
function OfflineBanner({ text }: { text: string }) {
  const colors = useColors();
  const insets = useSafeAreaInsets();
  return (
    <View accessibilityRole="alert" style={{ paddingTop: insets.top + 6, paddingBottom: 6, paddingHorizontal: 16, backgroundColor: colors.surface3, flexDirection: 'row', gap: 8, alignItems: 'center' }}>
      <Icon name="cloud-off" size={16} color={colors.text2} />
      <Text style={{ color: colors.text2, fontSize: 12 }}>{text}</Text>
    </View>
  );
}