feat: Implement importing/exporting data

android/app/src/main/AndroidManifest.xml

@@ -33,4 +33,5 @@
     </application>
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
 </manifest>

assets/i18n/strings_en.i18n.json

@@ -9,7 +9,15 @@
         "importMangaDesc": "Import manga list exported from MyAnimeList.",
         "invalidMangaListTitle": "Invalid manga list",
         "invalidMangaListBody": "The selected file is not a MAL manga list. It lacks the \".xml.gz\" suffix.",
-        "importIndicator": "$current of $total"
+        "importIndicator": "$current of $total",
+        "exportData": "Export data",
+        "importData": "Import data",
+        "dataExportSuccess": "Data successfully exported",
+        "dataImportSuccess": "Data successfully imported",
+        "importInvalidData": {
+            "title": "Invalid AniTrack Data",
+            "content": "The selected file is not an AniTrack data export. It lacks the \".json.gz\" suffix."
+        }
     },
     "about": {
         "title": "About",

lib/src/data/type.dart

@@ -10,62 +10,46 @@ enum TrackingMediumType {
 /// The state of the medium we're tracking, i.e. reading/watching, dropped, ...
 enum MediumTrackingState {
   /// Currently watching or reading
-  ongoing,
+  ongoing(0),
 
   /// Done
-  completed,
+  completed(1),
 
   /// Plan to watch or read
-  planned,
+  planned(2),
 
   /// Dropped
-  dropped,
+  dropped(3),
 
   /// Paused
-  paused,
+  paused(4),
 
   /// Meta state
-  all,
+  all(-1);
-}
 
-/// Interface for the Anime and Manga data classes
+  const MediumTrackingState(this.id);
-abstract class TrackingMedium {
-  /// The ID of the medium
-  final String id = '';
 
-  /// The title of the medium
+  factory MediumTrackingState.fromInt(int id) {
-  final String title = '';
+    switch (id) {
-
+      case 0:
-  /// The URL of the cover image.
+        return MediumTrackingState.ongoing;
-  final String thumbnailUrl = '';
+      case 1:
-
+        return MediumTrackingState.completed;
-  /// The tracking state
+      case 2:
-  final MediumTrackingState state = MediumTrackingState.planned;
+        return MediumTrackingState.planned;
-}
+      case 3:
-
+        return MediumTrackingState.dropped;
-extension MediumStateExtension on MediumTrackingState {
+      case 4:
-  int toInteger() {
+        return MediumTrackingState.paused;
-    assert(
-      this != MediumTrackingState.all,
-      'MediumTrackingState.all must not be serialized',
-    );
-    switch (this) {
-      case MediumTrackingState.ongoing:
-        return 0;
-      case MediumTrackingState.completed:
-        return 1;
-      case MediumTrackingState.planned:
-        return 2;
-      case MediumTrackingState.dropped:
-        return 3;
-      case MediumTrackingState.paused:
-        return 4;
-      case MediumTrackingState.all:
-        return -1;
     }
+
+    return MediumTrackingState.planned;
   }
 
-  String toNameString(TrackingMediumType type) {
+  /// The id of the value.
+  final int id;
+
+  String getName(TrackingMediumType type) {
     assert(
       this != MediumTrackingState.all,
       'MediumTrackingState.all must not be stringified',
@@ -98,28 +82,28 @@ extension MediumStateExtension on MediumTrackingState {
   }
 }
 
+/// Interface for the Anime and Manga data classes
+abstract class TrackingMedium {
+  /// The ID of the medium
+  final String id = '';
+
+  /// The title of the medium
+  final String title = '';
+
+  /// The URL of the cover image.
+  final String thumbnailUrl = '';
+
+  /// The tracking state
+  final MediumTrackingState state = MediumTrackingState.planned;
+}
+
 class MediumTrackingStateConverter
     implements JsonConverter<MediumTrackingState, int> {
   const MediumTrackingStateConverter();
 
   @override
-  MediumTrackingState fromJson(int json) {
+  MediumTrackingState fromJson(int json) => MediumTrackingState.fromInt(json);
-    switch (json) {
-      case 0:
-        return MediumTrackingState.ongoing;
-      case 1:
-        return MediumTrackingState.completed;
-      case 2:
-        return MediumTrackingState.planned;
-      case 3:
-        return MediumTrackingState.dropped;
-      case 4:
-        return MediumTrackingState.paused;
-    }
-
-    return MediumTrackingState.planned;
-  }
 
   @override
-  int toJson(MediumTrackingState state) => state.toInteger();
+  int toJson(MediumTrackingState state) => state.id;
 }

lib/src/ui/bloc/anime_list_bloc.dart

@@ -3,6 +3,7 @@ import 'package:anitrack/src/data/manga.dart';
 import 'package:anitrack/src/data/type.dart';
 import 'package:anitrack/src/service/database.dart';
 import 'package:bloc/bloc.dart';
+import 'package:collection/collection.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:get_it/get_it.dart';
 
@@ -63,7 +64,16 @@ class AnimeListBloc extends Bloc<AnimeListEvent, AnimeListState> {
     await GetIt.I.get<DatabaseService>().addAnime(event.data);
 
     // Add it to the cache
-    _animes.add(event.data);
+    if (event.checkIfExists) {
+      final shouldAdd =
+          _animes.firstWhereOrNull((element) => element.id == event.data.id) ==
+              null;
+      if (shouldAdd) {
+        _animes.add(event.data);
+      }
+    } else {
+      _animes.add(event.data);
+    }
 
     emit(
       state.copyWith(
@@ -80,7 +90,17 @@ class AnimeListBloc extends Bloc<AnimeListEvent, AnimeListState> {
     await GetIt.I.get<DatabaseService>().addManga(event.data);
 
     // Add it to the cache
-    _mangas.add(event.data);
+    // Add it to the cache
+    if (event.checkIfExists) {
+      final shouldAdd =
+          _mangas.firstWhereOrNull((element) => element.id == event.data.id) ==
+              null;
+      if (shouldAdd) {
+        _mangas.add(event.data);
+      }
+    } else {
+      _mangas.add(event.data);
+    }
 
     emit(
       state.copyWith(

lib/src/ui/bloc/anime_list_event.dart

@@ -17,10 +17,14 @@ class AnimeEpisodeDecrementedEvent extends AnimeListEvent {
 }
 
 class AnimeAddedEvent extends AnimeListEvent {
-  AnimeAddedEvent(this.data);
+  AnimeAddedEvent(this.data, {this.checkIfExists = false});
 
   /// The anime to add.
   final AnimeTrackingData data;
+
+  /// If true, checks if the anime with the id is already in the list.
+  /// If it is, does nothing.
+  final bool checkIfExists;
 }
 
 /// Triggered when animes are to be loaded from the database
@@ -59,10 +63,14 @@ class AnimeRemovedEvent extends AnimeListEvent {
 }
 
 class MangaAddedEvent extends AnimeListEvent {
-  MangaAddedEvent(this.data);
+  MangaAddedEvent(this.data, {this.checkIfExists = false});
 
   /// The manga to add.
   final MangaTrackingData data;
+
+  /// If true, checks if the manga with the id is already in the list.
+  /// If it is, does nothing.
+  final bool checkIfExists;
 }
 
 /// Triggered when the manga filter is changed

lib/src/ui/bloc/settings_bloc.dart

@@ -1,19 +1,25 @@
 import 'dart:async';
 import 'dart:convert';
+import 'dart:io';
+import 'package:anitrack/i18n/strings.g.dart';
 import 'package:anitrack/src/data/anime.dart';
 import 'package:anitrack/src/data/manga.dart';
 import 'package:anitrack/src/data/type.dart';
 import 'package:anitrack/src/service/database.dart';
+import 'package:anitrack/src/ui/bloc/anime_list_bloc.dart';
+import 'package:archive/archive.dart' as archive;
 import 'package:archive/archive_io.dart';
 import 'package:bloc/bloc.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:get_it/get_it.dart';
 import 'package:jikan_api/jikan_api.dart';
+import 'package:path/path.dart' as path;
 import 'package:xml/xml.dart';
 
-part 'settings_state.dart';
-part 'settings_event.dart';
 part 'settings_bloc.freezed.dart';
+part 'settings_event.dart';
+part 'settings_state.dart';
 
 MediumTrackingState malStatusToTrackingState(String status) {
   switch (status) {
@@ -39,6 +45,8 @@ class SettingsBloc extends Bloc<SettingsEvent, SettingsState> {
   SettingsBloc() : super(SettingsState()) {
     on<AnimeListImportedEvent>(_onAnimeListImported);
     on<MangaListImportedEvent>(_onMangaListImported);
+    on<DataExportedEvent>(_onDataExported);
+    on<DataImportedEvent>(_onDataImported);
   }
 
   void _showLoadingSpinner(Emitter<SettingsState> emit) {
@@ -205,4 +213,69 @@ class SettingsBloc extends Bloc<SettingsEvent, SettingsState> {
     // Hide the spinner again
     _hideLoadingSpinner(emit);
   }
+
+  Future<void> _onDataExported(
+    DataExportedEvent event,
+    Emitter<SettingsState> emit,
+  ) async {
+    final al = GetIt.I.get<AnimeListBloc>();
+    final data = {
+      // TODO(Unknown): Track the version here to (maybe) to migrations
+      'animes': al.state.animes.map((anime) => anime.toJson()).toList(),
+      'mangas': al.state.mangas.map((manga) => manga.toJson()).toList(),
+    };
+    final exportData = jsonEncode(data);
+    final date = DateTime.now();
+    final outputPath = path.join(
+      event.path,
+      'anitrack_${date.year}${date.month}${date.day}.json.gz',
+    );
+    archive.GZipEncoder().encode(
+      InputStream(utf8.encode(exportData)),
+      output: OutputFileStream(outputPath),
+    );
+
+    await Fluttertoast.showToast(
+      msg: t.settings.dataExportSuccess,
+    );
+  }
+
+  Future<void> _onDataImported(
+    DataImportedEvent event,
+    Emitter<SettingsState> emit,
+  ) async {
+    final al = GetIt.I.get<AnimeListBloc>();
+    final exportArchive = archive.GZipDecoder().decodeBytes(
+      await File(event.path).readAsBytes(),
+    );
+    final json = jsonDecode(utf8.decode(exportArchive)) as Map<String, dynamic>;
+
+    // Process anime
+    for (final animeRaw
+        in (json['animes']! as List<dynamic>).cast<Map<dynamic, dynamic>>()) {
+      final anime = AnimeTrackingData.fromJson(
+        animeRaw.cast<String, dynamic>(),
+      );
+
+      al.add(
+        AnimeAddedEvent(anime, checkIfExists: true),
+      );
+    }
+
+    // Process manga
+    for (final mangaRaw
+        in (json['mangas']! as List<dynamic>).cast<Map<dynamic, dynamic>>()) {
+      final manga = MangaTrackingData.fromJson(
+        mangaRaw.cast<String, dynamic>(),
+      );
+
+      al.add(
+        MangaAddedEvent(manga, checkIfExists: true),
+      );
+    }
+
+    await Fluttertoast.showToast(
+      msg: t.settings.dataImportSuccess,
+    );
+  }
 }

lib/src/ui/bloc/settings_event.dart

@@ -34,3 +34,19 @@ class MangaListImportedEvent extends SettingsEvent {
   /// The type of list we're importing
   final ImportListType type;
 }
+
+/// Triggered when a data export should be produced.
+class DataExportedEvent extends SettingsEvent {
+  DataExportedEvent(this.path);
+
+  /// The path where the export should be stored.
+  final String path;
+}
+
+/// Triggered when a data export has been picked for import.
+class DataImportedEvent extends SettingsEvent {
+  DataImportedEvent(this.path);
+
+  /// The path of the data export to import.
+  final String path;
+}

lib/src/ui/pages/anime_list.dart

@@ -72,23 +72,23 @@ class AnimeListPageState extends State<AnimeListPage> {
     return [
       PopupMenuItem<MediumTrackingState>(
         value: MediumTrackingState.ongoing,
-        child: Text(MediumTrackingState.ongoing.toNameString(type)),
+        child: Text(MediumTrackingState.ongoing.getName(type)),
       ),
       PopupMenuItem<MediumTrackingState>(
         value: MediumTrackingState.completed,
-        child: Text(MediumTrackingState.completed.toNameString(type)),
+        child: Text(MediumTrackingState.completed.getName(type)),
       ),
       PopupMenuItem<MediumTrackingState>(
         value: MediumTrackingState.planned,
-        child: Text(MediumTrackingState.planned.toNameString(type)),
+        child: Text(MediumTrackingState.planned.getName(type)),
       ),
       PopupMenuItem<MediumTrackingState>(
         value: MediumTrackingState.dropped,
-        child: Text(MediumTrackingState.dropped.toNameString(type)),
+        child: Text(MediumTrackingState.dropped.getName(type)),
       ),
       PopupMenuItem<MediumTrackingState>(
         value: MediumTrackingState.paused,
-        child: Text(MediumTrackingState.paused.toNameString(type)),
+        child: Text(MediumTrackingState.paused.getName(type)),
       ),
       const PopupMenuItem<MediumTrackingState>(
         value: MediumTrackingState.all,

lib/src/ui/pages/details.dart

@@ -158,27 +158,27 @@ class DetailsPage extends StatelessWidget {
                             SelectorItem(
                               MediumTrackingState.ongoing,
                               MediumTrackingState.ongoing
-                                  .toNameString(state.trackingType),
+                                  .getName(state.trackingType),
                             ),
                             SelectorItem(
                               MediumTrackingState.completed,
                               MediumTrackingState.completed
-                                  .toNameString(state.trackingType),
+                                  .getName(state.trackingType),
                             ),
                             SelectorItem(
                               MediumTrackingState.planned,
                               MediumTrackingState.planned
-                                  .toNameString(state.trackingType),
+                                  .getName(state.trackingType),
                             ),
                             SelectorItem(
                               MediumTrackingState.dropped,
                               MediumTrackingState.dropped
-                                  .toNameString(state.trackingType),
+                                  .getName(state.trackingType),
                             ),
                             SelectorItem(
                               MediumTrackingState.paused,
                               MediumTrackingState.paused
-                                  .toNameString(state.trackingType),
+                                  .getName(state.trackingType),
                             ),
                           ],
                           initialValue: state.data!.state,

lib/src/ui/pages/settings.dart

@@ -5,6 +5,7 @@ import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:get_it/get_it.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 class SettingsPage extends StatelessWidget {
   const SettingsPage({super.key});
@@ -91,6 +92,51 @@ class SettingsPage extends StatelessWidget {
                               );
                         },
                       ),
+                      ListTile(
+                        title: Text(t.settings.exportData),
+                        onTap: () async {
+                          // Pick the file
+                          final result =
+                              await FilePicker.platform.getDirectoryPath();
+                          if (result == null) return;
+
+                          if (!(await Permission.manageExternalStorage
+                                  .request())
+                              .isGranted) return;
+
+                          GetIt.I.get<SettingsBloc>().add(
+                                DataExportedEvent(
+                                  result,
+                                ),
+                              );
+                        },
+                      ),
+                      ListTile(
+                        title: Text(t.settings.importData),
+                        onTap: () async {
+                          // Pick the file
+                          final result = await FilePicker.platform.pickFiles();
+                          if (result == null) return;
+
+                          if (!result.files.first.path!.endsWith('.json.gz')) {
+                            await showDialog<void>(
+                              context: context,
+                              builder: (_) => AlertDialog(
+                                title: Text(t.settings.importInvalidData.title),
+                                content:
+                                    Text(t.settings.importInvalidData.content),
+                              ),
+                            );
+                            return;
+                          }
+
+                          GetIt.I.get<SettingsBloc>().add(
+                                DataImportedEvent(
+                                  result.files.first.path!,
+                                ),
+                              );
+                        },
+                      ),
                     ],
                   ),
                 ),

pubspec.lock

@@ -360,6 +360,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  fluttertoast:
+    dependency: "direct main"
+    description:
+      name: fluttertoast
+      sha256: "474f7d506230897a3cd28c965ec21c5328ae5605fc9c400cd330e9e9d6ac175c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.2.2"
   freezed:
     dependency: "direct dev"
     description:
@@ -561,7 +569,7 @@ packages:
     source: hosted
     version: "2.1.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
       sha256: db9d4f58c908a4ba5953fcee2ae317c94889433e5024c27ce74a37f94267945b
@@ -624,6 +632,46 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.11.1"
+  permission_handler:
+    dependency: "direct main"
+    description:
+      name: permission_handler
+      sha256: "63e5216aae014a72fe9579ccd027323395ce7a98271d9defa9d57320d001af81"
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.4.3"
+  permission_handler_android:
+    dependency: transitive
+    description:
+      name: permission_handler_android
+      sha256: c0c9754479a4c4b1c1f3862ddc11930c9b3f03bef2816bb4ea6eed1e13551d6f
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.3.2"
+  permission_handler_apple:
+    dependency: transitive
+    description:
+      name: permission_handler_apple
+      sha256: "99e220bce3f8877c78e4ace901082fb29fa1b4ebde529ad0932d8d664b34f3f5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.1.4"
+  permission_handler_platform_interface:
+    dependency: transitive
+    description:
+      name: permission_handler_platform_interface
+      sha256: "7c6b1500385dd1d2ca61bb89e2488ca178e274a69144d26bbd65e33eae7c02a9"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.11.3"
+  permission_handler_windows:
+    dependency: transitive
+    description:
+      name: permission_handler_windows
+      sha256: cc074aace208760f1eee6aa4fae766b45d947df85bc831cde77009cdb4720098
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.3"
   petitparser:
     dependency: transitive
     description:

pubspec.yaml

@@ -18,10 +18,13 @@ dependencies:
   flutter:
     sdk: flutter
   flutter_bloc: ^8.1.1
+  fluttertoast: ^8.2.2
   freezed_annotation: 2.1.0
   get_it: ^7.2.0
   jikan_api: ^2.0.0
   json_annotation: 4.6.0
+  path: ^1.8.2
+  permission_handler: ^10.4.3
   slang: 3.19.0
   slang_flutter: 3.19.0
   sqflite: ^2.2.4+1