Vaani/lib/features/player/providers/currently_playing_provider.dart

import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:shelfsdk/audiobookshelf_api.dart' as core;
import 'package:vaani/api/api_provider.dart';
import 'package:vaani/api/library_item_provider.dart';
import 'package:vaani/features/downloads/providers/download_manager.dart';
import 'package:vaani/features/per_book_settings/providers/book_settings_provider.dart';
import 'package:vaani/features/player/providers/audiobook_player.dart';
import 'package:vaani/features/settings/app_settings_provider.dart';
import 'package:vaani/globals.dart';

part 'currently_playing_provider.g.dart';

@riverpod
class CurrentBook extends _$CurrentBook {
  @override
  core.BookExpanded? build() {
    return null;
  }

  Future<void> update(core.BookExpanded book, Duration? currentTime) async {
    final audioService = ref.read(playerProvider);
    if (state == book) {
      appLogger.info('Book was already set');
      if (audioService.player.playing) {
        appLogger.info('Pausing the book');
        await audioService.pause();
        return;
      } else {
        await audioService.play();
      }
    }
    state = book;
    final api = ref.read(authenticatedApiProvider);
    final downloadManager = ref.read(simpleDownloadManagerProvider);
    final libItem =
        await ref.read(libraryItemProvider(state!.libraryItemId).future);
    final downloadedUris = await downloadManager.getDownloadedFilesUri(libItem);

    var bookPlayerSettings =
        ref.read(bookSettingsProvider(state!.libraryItemId)).playerSettings;
    var appPlayerSettings = ref.read(appSettingsProvider).playerSettings;

    var configurePlayerForEveryBook =
        appPlayerSettings.configurePlayerForEveryBook;
    audioService.setSourceAudiobook(
      state!,
      baseUrl: api.baseUrl,
      token: api.token!,
      initialPosition: currentTime,
      downloadedUris: downloadedUris,
      volume: configurePlayerForEveryBook
          ? bookPlayerSettings.preferredDefaultVolume ??
              appPlayerSettings.preferredDefaultVolume
          : appPlayerSettings.preferredDefaultVolume,
      speed: configurePlayerForEveryBook
          ? bookPlayerSettings.preferredDefaultSpeed ??
              appPlayerSettings.preferredDefaultSpeed
          : appPlayerSettings.preferredDefaultSpeed,
    );
  }
}

@riverpod
class CurrentChapter extends _$CurrentChapter {
  @override
  core.BookChapter? build() {
    final player = ref.watch(playerProvider);
    player.chapterStream.distinct().listen((chapter) {
      update(chapter);
    });
    return player.currentChapter;
  }

  void update(core.BookChapter? chapter) {
    if (state != chapter) {
      state = chapter;
    }
  }
}

@riverpod
List<core.BookChapter> currentChapters(Ref ref) {
  final book = ref.watch(currentBookProvider);
  if (book == null) {
    return [];
  }
  final currentChapter = ref.watch(currentChapterProvider);
  if (currentChapter == null) {
    return [];
  }
  final index = book.chapters.indexOf(currentChapter);
  final total = book.chapters.length;
  final start = index - 3 >= 0 ? index - 3 : 0;
  final end = start + 20 <= total ? start + 20 : total;
  return book.chapters.sublist(start, end);
}