import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:spotiflac_android/l10n/l10n.dart';
import 'package:spotiflac_android/providers/download_history_provider.dart';
import 'package:spotiflac_android/providers/library_search_provider.dart';
import 'package:spotiflac_android/providers/music_player_provider.dart';
import 'package:spotiflac_android/providers/playback_provider.dart';
import 'package:spotiflac_android/screens/downloaded_album_screen.dart';
import 'package:spotiflac_android/screens/library_tracks_folder_screen.dart';
import 'package:spotiflac_android/screens/local_album_screen.dart';
import 'package:spotiflac_android/services/history_database.dart';
import 'package:spotiflac_android/services/library_database.dart';
import 'package:spotiflac_android/services/library_search.dart';
import 'package:spotiflac_android/widgets/app_choice_chip.dart';
import 'package:spotiflac_android/widgets/cached_cover_image.dart';
import 'package:spotiflac_android/widgets/track_card.dart';

/// Slivers shared by Material's Library and Mornye's Library/Songs screens.
/// Only the current query's provider families are watched; late results from
/// an earlier query cannot replace what the user is currently searching for.
class LibrarySearchResults extends ConsumerStatefulWidget {
  const LibrarySearchResults({
    super.key,
    required this.query,
    required this.onOpenArtist,
  });

  final String query;
  final ValueChanged<String> onOpenArtist;

  @override
  ConsumerState<LibrarySearchResults> createState() =>
      _LibrarySearchResultsState();
}

class _LibrarySearchResultsState extends ConsumerState<LibrarySearchResults> {
  LibrarySearchKind? _kind;
  int _pages = 1;

  @override
  void didUpdateWidget(covariant LibrarySearchResults oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.query != widget.query) _pages = 1;
  }

  String _label(LibrarySearchKind kind) => switch (kind) {
    LibrarySearchKind.songs => context.l10n.searchSongs,
    LibrarySearchKind.albums => context.l10n.searchAlbums,
    LibrarySearchKind.artists => context.l10n.searchArtists,
    LibrarySearchKind.playlists => context.l10n.searchPlaylists,
  };

  void _select(LibrarySearchKind? kind) => setState(() {
    _kind = kind;
    _pages = 1;
  });

  Future<void> _open(LibrarySearchHit hit) async {
    FocusScope.of(context).unfocus();
    try {
      switch (hit.kind) {
        case LibrarySearchKind.songs:
          final row = hit.source == 'local'
              ? await LibraryDatabase.instance.getById(hit.id)
              : await HistoryDatabase.instance.getById(hit.id);
          if (!mounted || row == null) return;
          final media = hit.source == 'local'
              ? playableFromLocal(LocalLibraryItem.fromJson(row))
              : playableFromHistory(DownloadHistoryItem.fromJson(row));
          await ref
              .read(playbackProvider.notifier)
              .playMediaQueue(
                [media],
                startIndex: 0,
                externalPath: media.source,
              );
        case LibrarySearchKind.artists:
          widget.onOpenArtist(hit.title);
        case LibrarySearchKind.playlists:
          await Navigator.of(context).push(
            MaterialPageRoute<void>(
              builder: (_) => LibraryTracksFolderScreen(
                mode: LibraryTracksFolderMode.playlist,
                playlistId: hit.id,
              ),
            ),
          );
        case LibrarySearchKind.albums:
          if (hit.source == 'local') {
            final rows = await LibraryDatabase.instance
                .getQueueLocalAlbumTracksByKey(hit.id);
            if (!mounted) return;
            await Navigator.of(context).push(
              MaterialPageRoute<void>(
                builder: (_) => LocalAlbumScreen(
                  albumName: hit.title,
                  artistName: hit.artist,
                  coverPath: hit.cover,
                  tracks: rows.map(LocalLibraryItem.fromJson).toList(),
                ),
              ),
            );
          } else {
            await Navigator.of(context).push(
              MaterialPageRoute<void>(
                builder: (_) => DownloadedAlbumScreen(
                  albumName: hit.title,
                  artistName: hit.artist,
                  coverUrl: hit.cover,
                ),
              ),
            );
          }
      }
    } catch (error) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(context.l10n.snackbarCannotOpenFile('$error'))),
      );
    }
  }

  Widget _row(LibrarySearchHit hit) {
    final icon = switch (hit.kind) {
      LibrarySearchKind.songs => Icons.music_note_outlined,
      LibrarySearchKind.albums => Icons.album_outlined,
      LibrarySearchKind.artists => Icons.person_outline,
      LibrarySearchKind.playlists => Icons.queue_music,
    };
    final subtitle = hit.kind == LibrarySearchKind.songs
        ? hit.artist
        : [
            if (hit.kind == LibrarySearchKind.albums) hit.artist,
            context.l10n.queueTrackCount(hit.trackCount),
          ].join(' · ');
    Widget fallback(BuildContext context) => ColoredBox(
      color: Theme.of(context).colorScheme.surfaceContainerHighest,
      child: Center(child: Icon(icon)),
    );
    return TrackCard(
      key: ValueKey('${hit.kind.name}:${hit.source}:${hit.id}'),
      style: TrackCardStyle.flat,
      leading: ClipRRect(
        borderRadius: BorderRadius.circular(
          hit.kind == LibrarySearchKind.artists ? 28 : 8,
        ),
        child: SizedBox.square(
          dimension: 52,
          child: hit.cover?.isNotEmpty == true
              ? LocalOrNetworkCoverImage(url: hit.cover!, placeholder: fallback)
              : fallback(context),
        ),
      ),
      title: hit.title,
      subtitle: Text(subtitle, maxLines: 2, overflow: TextOverflow.ellipsis),
      trailing: Icon(
        hit.kind == LibrarySearchKind.songs
            ? Icons.play_arrow_rounded
            : Icons.chevron_right,
      ),
      onTap: () => _open(hit),
    );
  }

  @override
  Widget build(BuildContext context) {
    final slivers = <Widget>[
      SliverToBoxAdapter(
        child: SingleChildScrollView(
          scrollDirection: Axis.horizontal,
          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
          child: Row(
            spacing: 8,
            children: [
              for (final kind in [null, ...LibrarySearchKind.values])
                AppChoiceChip(
                  label: Text(
                    kind == null ? context.l10n.historyFilterAll : _label(kind),
                  ),
                  selected: _kind == kind,
                  singleChoice: true,
                  onSelected: (_) => _select(kind),
                ),
            ],
          ),
        ),
      ),
    ];
    var hasResults = false;
    var loading = false;
    var failed = false;
    for (final kind in _kind == null ? LibrarySearchKind.values : [_kind!]) {
      for (var page = 0; page < (_kind == null ? 1 : _pages); page++) {
        final pageSize = _kind == null ? 5 : 40;
        final request = (
          query: widget.query,
          kind: kind,
          limit: pageSize + 1,
          offset: page * pageSize,
        );
        final result = ref.watch(librarySearchProvider(request));
        loading |= result.isLoading;
        failed |= result.hasError;
        final hits = result.value ?? const <LibrarySearchHit>[];
        if (hits.isNotEmpty) {
          hasResults = true;
          if (page == 0) {
            slivers.add(
              SliverToBoxAdapter(
                child: ListTile(
                  title: Text(
                    _label(kind),
                    style: Theme.of(context).textTheme.titleLarge,
                  ),
                  trailing: _kind == null
                      ? const Icon(Icons.chevron_right)
                      : null,
                  onTap: _kind == null ? () => _select(kind) : null,
                ),
              ),
            );
          }
          slivers.add(
            SliverList.builder(
              itemCount: hits.length.clamp(0, pageSize),
              itemBuilder: (context, index) => _row(hits[index]),
            ),
          );
          if (_kind != null && page == _pages - 1 && hits.length > pageSize) {
            slivers.add(
              SliverToBoxAdapter(
                child: Center(
                  child: IconButton(
                    tooltip: _label(kind),
                    icon: const Icon(Icons.expand_more),
                    onPressed: () => setState(() => _pages++),
                  ),
                ),
              ),
            );
          }
        }
        if (result.hasError) {
          slivers.add(
            SliverToBoxAdapter(
              child: Center(
                child: TextButton.icon(
                  icon: const Icon(Icons.refresh),
                  label: Text('${_label(kind)} · ${context.l10n.dialogRetry}'),
                  onPressed: () =>
                      ref.invalidate(librarySearchProvider(request)),
                ),
              ),
            ),
          );
        }
      }
    }
    if (loading) {
      slivers.add(
        const SliverToBoxAdapter(
          child: Padding(
            padding: EdgeInsets.all(24),
            child: Center(child: CircularProgressIndicator.adaptive()),
          ),
        ),
      );
    } else if (!hasResults && !failed) {
      slivers.add(
        SliverToBoxAdapter(
          child: Padding(
            padding: const EdgeInsets.all(32),
            child: Text(
              context.l10n.searchEmptyResultSubtitle,
              textAlign: TextAlign.center,
            ),
          ),
        ),
      );
    }
    return SliverMainAxisGroup(slivers: slivers);
  }
}