AudiOhm/frontend/lib/presentation/providers/artist_provider.dart

/// Artist Provider - Artist details state management
library;

import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../infrastructure/datasources/remote/music_api_service.dart';
import '../../../domain/entities/artist.dart';
import '../../../domain/entities/track.dart';
import '../../../domain/entities/album.dart';

/// Artist state
class ArtistState {
  final Artist? artist;
  final List<Track> topTracks;
  final List<Album> albums;
  final List<Track> relatedTracks;
  final bool isLoading;
  final String? error;

  const ArtistState({
    this.artist,
    this.topTracks = const [],
    this.albums = const [],
    this.relatedTracks = const [],
    this.isLoading = false,
    this.error,
  });

  ArtistState copyWith({
    Artist? artist,
    List<Track>? topTracks,
    List<Album>? albums,
    List<Track>? relatedTracks,
    bool? isLoading,
    String? error,
  }) {
    return ArtistState(
      artist: artist ?? this.artist,
      topTracks: topTracks ?? this.topTracks,
      albums: albums ?? this.albums,
      relatedTracks: relatedTracks ?? this.relatedTracks,
      isLoading: isLoading ?? this.isLoading,
      error: error,
    );
  }
}

/// Artist notifier
class ArtistNotifier extends StateNotifier<ArtistState> {
  ArtistNotifier(this._musicApiService) : super(const ArtistState());

  final MusicApiService _musicApiService;

  /// Load complete artist information
  Future<void> loadArtist(String artistId) async {
    state = state.copyWith(isLoading: true, error: null);

    try {
      // Load artist details
      final artistData = await _musicApiService.getArtist(artistId);
      final artist = Artist.fromJson(artistData);

      state = state.copyWith(
        artist: artist,
        isLoading: false,
      );
    } catch (e) {
      state = state.copyWith(
        isLoading: false,
        error: e.toString(),
      );
    }
  }

  /// Load artist's top tracks
  Future<void> loadTopTracks(String artistId) async {
    try {
      final tracksData = await _musicApiService.getArtistTopTracks(artistId);
      final tracks = tracksData
          .map((json) => Track.fromJson(json as Map<String, dynamic>))
          .toList();

      state = state.copyWith(topTracks: tracks);
    } catch (e) {
      state = state.copyWith(error: e.toString());
    }
  }

  /// Load artist's albums
  Future<void> loadAlbums(String artistId) async {
    try {
      final albumsData = await _musicApiService.getArtistAlbums(artistId);
      final albums = albumsData
          .map((json) => Album.fromJson(json as Map<String, dynamic>))
          .toList();

      state = state.copyWith(albums: albums);
    } catch (e) {
      state = state.copyWith(error: e.toString());
    }
  }

  /// Load related tracks (based on artist's top track)
  Future<void> loadRelatedTracks(String artistId) async {
    try {
      // Get first track from top tracks for recommendations
      if (state.topTracks.isEmpty) {
        await loadTopTracks(artistId);
      }

      if (state.topTracks.isNotEmpty) {
        final firstTrack = state.topTracks.first;
        final relatedData =
            await _musicApiService.getRecommendations(firstTrack.id);
        final related = relatedData
            .map((json) => Track.fromJson(json as Map<String, dynamic>))
            .toList();

        state = state.copyWith(relatedTracks: related);
      }
    } catch (e) {
      state = state.copyWith(error: e.toString());
    }
  }

  /// Load all artist data at once
  Future<void> loadAllArtistData(String artistId) async {
    state = state.copyWith(isLoading: true, error: null);

    try {
      // Load all data in parallel
      final results = await Future.wait([
        _musicApiService.getArtist(artistId),
        _musicApiService.getArtistTopTracks(artistId),
        _musicApiService.getArtistAlbums(artistId),
      ]);

      final artist = Artist.fromJson(results[0] as Map<String, dynamic>);
      final topTracks = (results[1] as List)
          .map((json) => Track.fromJson(json as Map<String, dynamic>))
          .toList();
      final albums = (results[2] as List)
          .map((json) => Album.fromJson(json as Map<String, dynamic>))
          .toList();

      // Load related tracks based on first top track
      List<Track> relatedTracks = [];
      if (topTracks.isNotEmpty) {
        try {
          final relatedData =
              await _musicApiService.getRecommendations(topTracks.first.id);
          relatedTracks = relatedData
              .map((json) => Track.fromJson(json as Map<String, dynamic>))
              .toList();
        } catch (_) {
          // Don't fail if recommendations fail
        }
      }

      state = ArtistState(
        artist: artist,
        topTracks: topTracks,
        albums: albums,
        relatedTracks: relatedTracks,
        isLoading: false,
      );
    } catch (e) {
      state = state.copyWith(
        isLoading: false,
        error: e.toString(),
      );
    }
  }

  /// Clear state
  void clear() {
    state = const ArtistState();
  }
}

/// Artist provider
final artistProvider =
    StateNotifierProvider<ArtistNotifier, ArtistState>((ref) {
  final musicApiService = ref.watch(musicApiServiceProvider);
  return ArtistNotifier(musicApiService);
});

/// Artist data provider for a specific artist ID
final artistDataProvider = Provider.family<ArtistState, String>((ref, artistId) {
  final notifier = ref.watch(artistProvider.notifier);
  // Load data when first accessed
  if (notifier.state.artist?.id != artistId) {
    Future.microtask(() => notifier.loadAllArtistData(artistId));
  }
  return notifier.state;
});