import { unwrap } from '@pipu/core';
import { keepPreviousData, useQuery } from '@tanstack/react-query';
import { useRouter } from 'expo-router';
import * as SecureStore from 'expo-secure-store';
import { useEffect, useState } from 'react';
import { useTranslation } from 'react-i18next';
import { FlatList, Pressable, Text, TextInput, View } from 'react-native';

import { useSession } from '../../lib/session';
import { player } from '../../player/controller';
import { usePlayerState } from '../../player/hooks';
import { radius, useColors } from '../../theme';
import { Cover, Icon, Screen, TrackRow, useErrorText } from '../../ui/kit';

const RECENT_KEY = 'pipu.recent_searches';

/** Поиск: подсказки по мере ввода (debounce 250 мс), недавние запросы — локально. */
export default function SearchScreen() {
  const colors = useColors();
  const { t } = useTranslation();
  const session = useSession();
  const router = useRouter();
  const current = usePlayerState().track;
  const errorText = useErrorText();
  const [q, setQ] = useState('');
  const [debounced, setDebounced] = useState('');
  const [recent, setRecent] = useState<string[]>([]);

  useEffect(() => {
    void SecureStore.getItemAsync(RECENT_KEY).then((v) => setRecent(v ? (JSON.parse(v) as string[]) : []));
  }, []);
  useEffect(() => {
    const id = setTimeout(() => setDebounced(q.trim()), 250);
    return () => clearTimeout(id);
  }, [q]);

  const remember = (query: string) => {
    const next = [query, ...recent.filter((r) => r !== query)].slice(0, 10);
    setRecent(next);
    void SecureStore.setItemAsync(RECENT_KEY, JSON.stringify(next));
  };

  const res = useQuery({
    queryKey: ['m-search', debounced],
    enabled: debounced !== '',
    placeholderData: keepPreviousData,
    queryFn: async ({ signal }) =>
      unwrap(await session.client.GET('/api/v1/search', { params: { query: { q: debounced } }, signal })),
  });
  const data = debounced ? res.data : undefined;

  return (
    <Screen>
      <View style={{ padding: 16, gap: 8 }}>
        <View style={{ flexDirection: 'row', alignItems: 'center', gap: 8, height: 46, paddingHorizontal: 12, borderRadius: radius.md, backgroundColor: colors.surface2 }}>
          <Icon name="search" color={colors.text3} />
          <TextInput
            value={q}
            onChangeText={setQ}
            onSubmitEditing={() => q.trim() && remember(q.trim())}
            placeholder={t('search.placeholder')}
            placeholderTextColor={colors.text3}
            autoCorrect={false}
            autoCapitalize="none"
            accessibilityLabel={t('search.label')}
            style={{ flex: 1, color: colors.text, fontSize: 16 }}
            returnKeyType="search"
          />
          {!!q && (
            <Pressable onPress={() => setQ('')} hitSlop={10} accessibilityRole="button" accessibilityLabel={t('form.close')}>
              <Icon name="close" color={colors.text3} size={20} />
            </Pressable>
          )}
        </View>
        {data?.corrected_query && <Text style={{ color: colors.warn, fontSize: 13 }}>{t('search.corrected', { query: data.corrected_query })}</Text>}
        {res.error && <Text style={{ color: colors.danger }}>{errorText(res.error)}</Text>}
      </View>

      {!debounced ? (
        <View style={{ paddingHorizontal: 16, gap: 4 }}>
          {recent.length > 0 && (
            <View style={{ flexDirection: 'row', justifyContent: 'space-between', marginBottom: 4 }}>
              <Text style={{ color: colors.text3, fontSize: 12, fontWeight: '700', textTransform: 'uppercase' }}>{t('mobile.recent_searches')}</Text>
              <Pressable onPress={() => { setRecent([]); void SecureStore.deleteItemAsync(RECENT_KEY); }} accessibilityRole="button">
                <Text style={{ color: colors.accent2 }}>{t('mobile.clear_recent')}</Text>
              </Pressable>
            </View>
          )}
          {recent.map((r) => (
            <Pressable key={r} onPress={() => setQ(r)} style={{ flexDirection: 'row', alignItems: 'center', gap: 10, paddingVertical: 10 }}>
              <Icon name="history" size={20} color={colors.text3} />
              <Text style={{ color: colors.text }}>{r}</Text>
            </Pressable>
          ))}
        </View>
      ) : (
        <FlatList
          data={data?.tracks ?? []}
          keyExtractor={(tr) => tr.id}
          ListHeaderComponent={
            <View style={{ gap: 4 }}>
              {data?.artists.map((a) => (
                <Pressable key={a.id} onPress={() => { remember(debounced); router.push(`/artist/${a.id}`); }} style={{ flexDirection: 'row', alignItems: 'center', gap: 12, paddingHorizontal: 16, paddingVertical: 8 }}>
                  <Cover album={{ id: a.id }} size={44} round />
                  <View>
                    <Text style={{ color: colors.text, fontWeight: '600' }}>{a.name}</Text>
                    <Text style={{ color: colors.text3, fontSize: 12 }}>{t('search.artist_kind')}</Text>
                  </View>
                </Pressable>
              ))}
              {data?.albums.map((al) => (
                <Pressable key={al.id} onPress={() => { remember(debounced); router.push(`/album/${al.id}`); }} style={{ flexDirection: 'row', alignItems: 'center', gap: 12, paddingHorizontal: 16, paddingVertical: 8 }}>
                  <Cover album={al} size={44} />
                  <View style={{ flex: 1 }}>
                    <Text numberOfLines={1} style={{ color: colors.text, fontWeight: '600' }}>{al.title}</Text>
                    <Text style={{ color: colors.text3, fontSize: 12 }}>{[al.artist.name, al.year].filter(Boolean).join(' · ')}</Text>
                  </View>
                </Pressable>
              ))}
            </View>
          }
          ListEmptyComponent={
            res.isSuccess && !data?.artists.length && !data?.albums.length ? (
              <Text style={{ color: colors.text3, textAlign: 'center', marginTop: 24 }}>{t('search.nothing')}</Text>
            ) : null
          }
          renderItem={({ item, index }) => (
            <TrackRow
              track={item}
              current={current?.id === item.id}
              onPress={() => {
                remember(debounced);
                void player.playList(data?.tracks ?? [], index, { type: 'search', id: debounced });
              }}
              onLike={() => void player.react(item, item.reaction === 'like' ? null : 'like').then(() => res.refetch())}
            />
          )}
        />
      )}
    </Screen>
  );
}