freezer/lib/api/cache.dart

import 'package:freezer/api/definitions.dart';
import 'package:json_annotation/json_annotation.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as p;

import 'dart:io';
import 'dart:convert';
import 'dart:async';

part 'cache.g.dart';

late Cache cache;

//Cache for miscellaneous things
@JsonSerializable()
class Cache {
  //ID's of tracks that are in library
  List<String>? libraryTracks = [];

  //Track ID of logged track, to prevent duplicates
  @JsonKey(ignore: true)
  String? loggedTrackId;

  @JsonKey(defaultValue: [])
  List<Track> history = [];

  //All sorting cached
  @JsonKey(defaultValue: [])
  List<Sorting?> sorts = [];

  //Sleep timer
  @JsonKey(ignore: true)
  DateTime? sleepTimerTime;
  @JsonKey(ignore: true)
  // ignore: cancel_subscriptions
  StreamSubscription? sleepTimer;

  //Search history
  @JsonKey(name: 'searchHistory2')
  List<SearchHistoryItem>? searchHistory;

  //If download threads warning was shown
  @JsonKey(defaultValue: false)
  bool? threadsWarning;

  //Last time update check
  @JsonKey(defaultValue: 0)
  int? lastUpdateCheck;

  @JsonKey(ignore: true)
  bool wakelock = false;

  Cache({this.libraryTracks});

  //Wrapper to test if track is favorite against cache
  bool checkTrackFavorite(Track t) {
    if (t.favorite != null && t.favorite!) return true;
    if (libraryTracks == null || libraryTracks!.length == 0) return false;
    return libraryTracks!.contains(t.id);
  }

  //Add to history
  void addToSearchHistory(dynamic item) async {
    if (searchHistory == null) searchHistory = [];

    // Remove duplicate
    int i = searchHistory!.indexWhere((e) => e.data.id == item.id);
    if (i != -1) {
      searchHistory!.removeAt(i);
    }

    if (item is Track)
      searchHistory!.add(SearchHistoryItem(item, SearchHistoryItemType.TRACK));
    if (item is Album)
      searchHistory!.add(SearchHistoryItem(item, SearchHistoryItemType.ALBUM));
    if (item is Artist)
      searchHistory!.add(SearchHistoryItem(item, SearchHistoryItemType.ARTIST));
    if (item is Playlist)
      searchHistory!
          .add(SearchHistoryItem(item, SearchHistoryItemType.PLAYLIST));

    await save();
  }

  //Save, load
  static Future<String> getPath() async {
    return p.join(
        (await getApplicationDocumentsDirectory()).path, 'metacache.json');
  }

  static Future wipe() async {
    await File(await getPath()).delete();
  }

  static Future<Cache> load() async {
    File file = File(await Cache.getPath());
    //Doesn't exist, create new
    if (!(await file.exists())) {
      Cache c = Cache();
      await c.save();
      return c;
    }
    return Cache.fromJson(jsonDecode(await file.readAsString()));
  }

  Future save() async {
    File file = File(await Cache.getPath());
    file.writeAsString(jsonEncode(this.toJson()));
  }

  //JSON
  factory Cache.fromJson(Map<String, dynamic> json) => _$CacheFromJson(json);
  Map<String, dynamic> toJson() => _$CacheToJson(this);

  //Search History JSON
  // static List<SearchHistoryItem> _searchHistoryFromJson(List<dynamic>? json) {
  //   return (json ?? [])
  //       .map<SearchHistoryItem>((i) => _searchHistoryItemFromJson(i))
  //       .toList();
  // }

  // static SearchHistoryItem _searchHistoryItemFromJson(
  //     Map<String, dynamic> json) {
  //   SearchHistoryItemType type = SearchHistoryItemType.values[json['type']];
  //   dynamic data;
  //   switch (type) {
  //     case SearchHistoryItemType.TRACK:
  //       data = Track.fromJson(json['data']);
  //       break;
  //     case SearchHistoryItemType.ALBUM:
  //       data = Album.fromJson(json['data']);
  //       break;
  //     case SearchHistoryItemType.ARTIST:
  //       data = Artist.fromJson(json['data']);
  //       break;
  //     case SearchHistoryItemType.PLAYLIST:
  //       data = Playlist.fromJson(json['data']);
  //       break;
  //   }
  //   return SearchHistoryItem(data, type);
  // }

}

@JsonSerializable()
class SearchHistoryItem {
  dynamic data;
  @JsonKey(
      toJson: _searchHistoryItemTypeToJson,
      fromJson: _searchHistoryItemTypeFromJson)
  SearchHistoryItemType type;

  SearchHistoryItem(this.data, this.type);

  Map<String, dynamic> toJson() => _$SearchHistoryItemToJson(this);
  factory SearchHistoryItem.fromJson(Map<String, dynamic> json) =>
      _$SearchHistoryItemFromJson(json);

  static int _searchHistoryItemTypeToJson(SearchHistoryItemType type) =>
      type.index;
  static SearchHistoryItemType _searchHistoryItemTypeFromJson(int index) =>
      SearchHistoryItemType.values[index];
}

enum SearchHistoryItemType { TRACK, ALBUM, ARTIST, PLAYLIST }