import 'dart:convert';

import 'package:event_bus/event_bus.dart';
import 'package:kiwi/kiwi.dart';
import 'package:nc_photos/account.dart';
import 'package:nc_photos/event/event.dart';
import 'package:shared_preferences/shared_preferences.dart';

class Pref {
  static Future<void> init() async {
    return SharedPreferences.getInstance().then((pref) {
      _inst._pref = pref;
    });
  }

  factory Pref.inst() => _inst;

  List<Account>? getAccounts() {
    final jsonObjs = _pref.getStringList(_toKey(PrefKey.accounts));
    return jsonObjs?.map((e) => Account.fromJson(jsonDecode(e))).toList();
  }

  List<Account> getAccountsOr(List<Account> def) => getAccounts() ?? def;
  Future<bool> setAccounts(List<Account> value) {
    final jsons = value.map((e) => jsonEncode(e.toJson())).toList();
    return _setStringList(PrefKey.accounts, jsons);
  }

  int? getCurrentAccountIndex() =>
      _pref.getInt(_toKey(PrefKey.currentAccountIndex));
  int getCurrentAccountIndexOr(int def) => getCurrentAccountIndex() ?? def;
  Future<bool> setCurrentAccountIndex(int value) =>
      _setInt(PrefKey.currentAccountIndex, value);

  int? getHomePhotosZoomLevel() =>
      _pref.getInt(_toKey(PrefKey.homePhotosZoomLevel));
  int getHomePhotosZoomLevelOr(int def) => getHomePhotosZoomLevel() ?? def;
  Future<bool> setHomePhotosZoomLevel(int value) =>
      _setInt(PrefKey.homePhotosZoomLevel, value);

  int? getAlbumBrowserZoomLevel() =>
      _pref.getInt(_toKey(PrefKey.albumBrowserZoomLevel));
  int getAlbumBrowserZoomLevelOr(int def) => getAlbumBrowserZoomLevel() ?? def;
  Future<bool> setAlbumBrowserZoomLevel(int value) =>
      _setInt(PrefKey.albumBrowserZoomLevel, value);

  int? getHomeAlbumsSort() => _pref.getInt(_toKey(PrefKey.homeAlbumsSort));
  int getHomeAlbumsSortOr(int def) => getHomeAlbumsSort() ?? def;
  Future<bool> setHomeAlbumsSort(int value) =>
      _setInt(PrefKey.homeAlbumsSort, value);

  bool? isEnableExif() => _pref.getBool(_toKey(PrefKey.enableExif));
  bool isEnableExifOr([bool def = true]) => isEnableExif() ?? def;
  Future<bool> setEnableExif(bool value) => _setBool(PrefKey.enableExif, value);

  int? getViewerScreenBrightness() =>
      _pref.getInt(_toKey(PrefKey.viewerScreenBrightness));
  int getViewerScreenBrightnessOr([int def = -1]) =>
      getViewerScreenBrightness() ?? def;
  Future<bool> setViewerScreenBrightness(int value) =>
      _setInt(PrefKey.viewerScreenBrightness, value);

  bool? isViewerForceRotation() =>
      _pref.getBool(_toKey(PrefKey.viewerForceRotation));
  bool isViewerForceRotationOr([bool def = false]) =>
      isViewerForceRotation() ?? def;
  Future<bool> setViewerForceRotation(bool value) =>
      _setBool(PrefKey.viewerForceRotation, value);

  int? getSetupProgress() => _pref.getInt(_toKey(PrefKey.setupProgress));
  int getSetupProgressOr([int def = 0]) => getSetupProgress() ?? def;
  Future<bool> setSetupProgress(int value) =>
      _setInt(PrefKey.setupProgress, value);

  /// Return the version number when the app last ran
  int? getLastVersion() => _pref.getInt(_toKey(PrefKey.lastVersion));
  int getLastVersionOr(int def) => getLastVersion() ?? def;
  Future<bool> setLastVersion(int value) => _setInt(PrefKey.lastVersion, value);

  bool? isDarkTheme() => _pref.getBool(_toKey(PrefKey.darkTheme));
  bool isDarkThemeOr(bool def) => isDarkTheme() ?? def;
  Future<bool> setDarkTheme(bool value) => _setBool(PrefKey.darkTheme, value);

  bool? isFollowSystemTheme() =>
      _pref.getBool(_toKey(PrefKey.followSystemTheme));
  bool isFollowSystemThemeOr(bool def) => isFollowSystemTheme() ?? def;
  Future<bool> setFollowSystemTheme(bool value) =>
      _setBool(PrefKey.followSystemTheme, value);

  bool? isUseBlackInDarkTheme() =>
      _pref.getBool(_toKey(PrefKey.useBlackInDarkTheme));
  bool isUseBlackInDarkThemeOr(bool def) => isUseBlackInDarkTheme() ?? def;
  Future<bool> setUseBlackInDarkTheme(bool value) =>
      _setBool(PrefKey.useBlackInDarkTheme, value);

  int? getLanguage() => _pref.getInt(_toKey(PrefKey.language));
  int getLanguageOr(int def) => getLanguage() ?? def;
  Future<bool> setLanguage(int value) => _setInt(PrefKey.language, value);

  int? getSlideshowDuration() =>
      _pref.getInt(_toKey(PrefKey.slideshowDuration));
  int getSlideshowDurationOr(int def) => getSlideshowDuration() ?? def;
  Future<bool> setSlideshowDuration(int value) =>
      _setInt(PrefKey.slideshowDuration, value);

  bool? isSlideshowShuffle() =>
      _pref.getBool(_toKey(PrefKey.isSlideshowShuffle));
  bool isSlideshowShuffleOr(bool def) => isSlideshowShuffle() ?? def;
  Future<bool> setSlideshowShuffle(bool value) =>
      _setBool(PrefKey.isSlideshowShuffle, value);

  bool? isSlideshowRepeat() => _pref.getBool(_toKey(PrefKey.isSlideshowRepeat));
  bool isSlideshowRepeatOr(bool def) => isSlideshowRepeat() ?? def;
  Future<bool> setSlideshowRepeat(bool value) =>
      _setBool(PrefKey.isSlideshowRepeat, value);

  bool? hasNewSharedAlbum() => _pref.getBool(_toKey(PrefKey.newSharedAlbum));
  bool hasNewSharedAlbumOr(bool def) => hasNewSharedAlbum() ?? def;
  Future<bool> setNewSharedAlbum(bool value) =>
      _setBool(PrefKey.newSharedAlbum, value);

  bool? isLabEnableSharedAlbum() =>
      _pref.getBool(_toKey(PrefKey.labEnableSharedAlbum));
  bool isLabEnableSharedAlbumOr(bool def) => isLabEnableSharedAlbum() ?? def;
  Future<bool> setLabEnableSharedAlbum(bool value) =>
      _setBool(PrefKey.labEnableSharedAlbum, value);

  bool? isLabEnablePeople() => _pref.getBool(_toKey(PrefKey.labEnablePeople));
  bool isLabEnablePeopleOr(bool def) => isLabEnablePeople() ?? def;
  Future<bool> setLabEnablePeople(bool value) =>
      _setBool(PrefKey.labEnablePeople, value);

  Pref._();

  Future<bool> _setBool(PrefKey key, bool value) async {
    return _onPostSet(await _pref.setBool(_toKey(key), value), key, value);
  }

  Future<bool> _setInt(PrefKey key, int value) async {
    return _onPostSet(await _pref.setInt(_toKey(key), value), key, value);
  }

  Future<bool> _setStringList(PrefKey key, List<String> value) async {
    return _onPostSet(
        await _pref.setStringList(_toKey(key), value), key, value);
  }

  bool _onPostSet(bool result, PrefKey key, dynamic value) {
    if (result) {
      KiwiContainer().resolve<EventBus>().fire(PrefUpdatedEvent(key, value));
      return true;
    } else {
      return false;
    }
  }

  String _toKey(PrefKey key) {
    switch (key) {
      case PrefKey.accounts:
        return "accounts";
      case PrefKey.currentAccountIndex:
        return "currentAccountIndex";
      case PrefKey.homePhotosZoomLevel:
        return "homePhotosZoomLevel";
      case PrefKey.albumBrowserZoomLevel:
        return "albumViewerZoomLevel";
      case PrefKey.homeAlbumsSort:
        return "homeAlbumsSort";
      case PrefKey.enableExif:
        return "isEnableExif";
      case PrefKey.viewerScreenBrightness:
        return "viewerScreenBrightness";
      case PrefKey.viewerForceRotation:
        return "viewerForceRotation";
      case PrefKey.setupProgress:
        return "setupProgress";
      case PrefKey.lastVersion:
        return "lastVersion";
      case PrefKey.darkTheme:
        return "isDarkTheme";
      case PrefKey.followSystemTheme:
        return "isFollowSystemTheme";
      case PrefKey.useBlackInDarkTheme:
        return "isUseBlackInDarkTheme";
      case PrefKey.language:
        return "language";
      case PrefKey.newSharedAlbum:
        return "hasNewSharedAlbum";
      case PrefKey.labEnableSharedAlbum:
        return "isLabEnableSharedAlbum";
      case PrefKey.labEnablePeople:
        return "isLabEnablePeople";
      case PrefKey.slideshowDuration:
        return "slideshowDuration";
      case PrefKey.isSlideshowShuffle:
        return "isSlideshowShuffle";
      case PrefKey.isSlideshowRepeat:
        return "isSlideshowRepeat";
    }
  }

  static final _inst = Pref._();
  late SharedPreferences _pref;
}

enum PrefKey {
  accounts,
  currentAccountIndex,
  homePhotosZoomLevel,
  albumBrowserZoomLevel,
  homeAlbumsSort,
  enableExif,
  viewerScreenBrightness,
  viewerForceRotation,
  setupProgress,
  lastVersion,
  darkTheme,
  followSystemTheme,
  useBlackInDarkTheme,
  language,
  newSharedAlbum,
  labEnableSharedAlbum,
  labEnablePeople,
  slideshowDuration,
  isSlideshowShuffle,
  isSlideshowRepeat,
}

extension PrefExtension on Pref {
  Account? getCurrentAccount() {
    try {
      return Pref.inst().getAccounts()![Pref.inst().getCurrentAccountIndex()!];
    } catch (_) {
      return null;
    }
  }
}