import 'package:flutter_riverpod/flutter_riverpod.dart';

import 'shared/settings_persistence.dart';


const kLanguageNames = <String, String>{
  'chi': '中文',
  'zho': '中文',
  'eng': '英语',
  'jpn': '日语',
  'kor': '韩语',
  'fre': '法语',
  'fra': '法语',
  'ger': '德语',
  'deu': '德语',
  'spa': '西班牙语',
  'ita': '意大利语',
  'por': '葡萄牙语',
  'rus': '俄语',
  'ara': '阿拉伯语',
  'hin': '印地语',
  'tha': '泰语',
  'vie': '越南语',
  'pol': '波兰语',
  'tur': '土耳其语',
  'dut': '荷兰语',
  'nld': '荷兰语',
  'dan': '丹麦语',
  'fin': '芬兰语',
  'swe': '瑞典语',
  'nor': '挪威语',
  'nob': '书面挪威语',
  'cat': '加泰罗尼亚语',
  'cze': '捷克语',
  'ces': '捷克语',
  'hun': '匈牙利语',
  'gre': '希腊语',
  'ell': '希腊语',
  'heb': '希伯来语',
  'ind': '印度尼西亚语',
  'may': '马来语',
  'msa': '马来语',
  'hrv': '克罗地亚语',
  'baq': '巴斯克语',
  'eus': '巴斯克语',
  'glg': '加利西亚语',
  'fil': '菲律宾语',
  'rum': '罗马尼亚语',
  'ron': '罗马尼亚语',
  'bul': '保加利亚语',
  'ukr': '乌克兰语',
  'srp': '塞尔维亚语',
  'slk': '斯洛伐克语',
  'slv': '斯洛文尼亚语',
  'lit': '立陶宛语',
  'lav': '拉脱维亚语',
  'est': '爱沙尼亚语',
};


class RememberedSubtitleTrack {
  final int streamIndex;
  final String? language;
  final String? title;
  final DateTime updatedAt;

  const RememberedSubtitleTrack({
    required this.streamIndex,
    this.language,
    this.title,
    required this.updatedAt,
  });

  bool get isNone => streamIndex == -1;

  Map<String, dynamic> toJson() => {
    'streamIndex': streamIndex,
    if (language != null) 'language': language,
    if (title != null) 'title': title,
    'updatedAt': updatedAt.toIso8601String(),
  };

  factory RememberedSubtitleTrack.fromJson(Map<String, dynamic> json) {
    return RememberedSubtitleTrack(
      streamIndex: (json['streamIndex'] as num?)?.toInt() ?? -1,
      language: json['language'] as String?,
      title: json['title'] as String?,
      updatedAt:
          DateTime.tryParse(json['updatedAt'] as String? ?? '') ??
          DateTime.now(),
    );
  }
}

class SubtitleStyleSettings {
  final int position;
  final double fontSize;
  final double delay;
  final double bgOpacity;

  const SubtitleStyleSettings({
    this.position = 100,
    this.fontSize = 55,
    this.delay = 0.0,
    this.bgOpacity = 0.0,
  });

  SubtitleStyleSettings copyWith({
    int? position,
    double? fontSize,
    double? delay,
    double? bgOpacity,
  }) => SubtitleStyleSettings(
    position: position ?? this.position,
    fontSize: fontSize ?? this.fontSize,
    delay: delay ?? this.delay,
    bgOpacity: bgOpacity ?? this.bgOpacity,
  );
}

class SubtitleSettingsNotifier extends AsyncNotifier<SubtitleStyleSettings>
    with SettingsPersistence {
  static const _keyPosition = 'smplayer.subtitle_position';
  static const _keyFontSize = 'smplayer.subtitle_font_size';
  static const _keyDelay = 'smplayer.subtitle_delay';
  static const _keyBgOpacity = 'smplayer.subtitle_bg_opacity';

  static const _keyLastTracks = 'smplayer.subtitle_last_tracks_primary';
  static const _maxRememberedTracks = 200;

  @override
  Future<SubtitleStyleSettings> build() async {
    final prefs = await getPrefs();
    for (final stale in const [
      'smplayer.subtitle_default_policy',
      'smplayer.subtitle_preferred_language',
      'smplayer.subtitle_secondary_position',
      'smplayer.subtitle_secondary_font_size',
      'smplayer.subtitle_secondary_delay',
      'smplayer.subtitle_secondary_bg_opacity',
      'smplayer.subtitle_secondary_follow_primary',
      'smplayer.subtitle_last_tracks_secondary',
    ]) {
      await prefs.remove(stale);
    }
    return SubtitleStyleSettings(
      position: prefs.getInt(_keyPosition) ?? 100,
      fontSize: prefs.getDouble(_keyFontSize) ?? 55,
      delay: prefs.getDouble(_keyDelay) ?? 0.0,
      bgOpacity: prefs.getDouble(_keyBgOpacity) ?? 0.0,
    );
  }

  Future<void> setSettings(SubtitleStyleSettings settings) async {
    state = AsyncValue.data(settings);
    await persistFields({
      _keyPosition: settings.position,
      _keyFontSize: settings.fontSize,
      _keyDelay: settings.delay,
      _keyBgOpacity: settings.bgOpacity,
    });
  }


  Future<void> saveLastSubtitleTrack(
    String key,
    RememberedSubtitleTrack? track,
  ) async {
    if (track == null) return;
    await putRemembered(
      _keyLastTracks,
      key,
      track.toJson(),
      _maxRememberedTracks,
    );
  }

  Future<RememberedSubtitleTrack?> getLastSubtitleTrack(String key) async {
    final entry = await readRemembered(_keyLastTracks, key);
    return entry == null ? null : RememberedSubtitleTrack.fromJson(entry);
  }
}

final subtitleSettingsProvider =
    AsyncNotifierProvider<SubtitleSettingsNotifier, SubtitleStyleSettings>(
      SubtitleSettingsNotifier.new,
    );