Refactored whole export/import methods in DataTransferService

2025-11-19 00:32:16 +01:00
parent f2a749cb0f
commit 82e28b7509
2 changed files with 144 additions and 151 deletions
--- a/lib/services/data_transfer_service.dart
+++ b/lib/services/data_transfer_service.dart
@@ -0,0 +1,135 @@
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/material.dart';
+import 'package:game_tracker/data/db/database.dart';
+import 'package:game_tracker/data/dto/game.dart';
+import 'package:game_tracker/data/dto/group.dart';
+import 'package:game_tracker/data/dto/player.dart';
+import 'package:game_tracker/presentation/views/main_menu/settings_view.dart';
+import 'package:provider/provider.dart';
+
+class DataTransferService {
+  /// Deletes all data from the database.
+  static Future<void> deleteAllData(BuildContext context) async {
+    final db = Provider.of<AppDatabase>(context, listen: false);
+    await db.gameDao.deleteAllGames();
+    await db.groupDao.deleteAllGroups();
+    await db.playerDao.deleteAllPlayers();
+    print('[deleteAllData] All data deleted');
+  }
+
+  static Future<String> getAppDataAsJson(BuildContext context) async {
+    final db = Provider.of<AppDatabase>(context, listen: false);
+    final games = await db.gameDao.getAllGames();
+    final groups = await db.groupDao.getAllGroups();
+    final players = await db.playerDao.getAllPlayers();
+
+    // Construct a JSON representation of the data
+    final Map<String, dynamic> jsonMap = {
+      'games': games.map((game) => game.toJson()).toList(),
+      'groups': groups.map((group) => group.toJson()).toList(),
+      'players': players.map((player) => player.toJson()).toList(),
+    };
+
+    return json.encode(jsonMap);
+  }
+
+  /// Exports the given JSON string to a file with the specified name.
+  static Future<bool> exportData(String jsonString, String fileName) async {
+    try {
+      final bytes = Uint8List.fromList(utf8.encode(jsonString));
+      await FilePicker.platform.saveFile(
+        fileName: '$fileName.json',
+        bytes: bytes,
+      );
+      return true;
+    } catch (e, stack) {
+      print('[exportData] $e');
+      print(stack);
+      return false;
+    }
+  }
+
+  /// Imports data from a selected JSON file into the database.
+  static Future<void> importData(BuildContext context) async {
+    final db = Provider.of<AppDatabase>(context, listen: false);
+
+    final path = await FilePicker.platform.pickFiles(
+      type: FileType.custom,
+      allowedExtensions: ['json'],
+    );
+
+    if (path == null) {
+      print('[importData] No file selected');
+      return;
+    }
+
+    try {
+      final jsonString = await _readFileContent(path.files.single);
+
+      if (await SettingsView.validateJsonSchema(jsonString)) {
+        final Map<String, dynamic> jsonData =
+            json.decode(jsonString) as Map<String, dynamic>;
+
+        final List<dynamic>? gamesJson = jsonData['games'] as List<dynamic>?;
+        final List<dynamic>? groupsJson = jsonData['groups'] as List<dynamic>?;
+        final List<dynamic>? playersJson =
+            jsonData['players'] as List<dynamic>?;
+
+        final List<Game> importedGames =
+            gamesJson
+                ?.map((g) => Game.fromJson(g as Map<String, dynamic>))
+                .toList() ??
+            [];
+        final List<Group> importedGroups =
+            groupsJson
+                ?.map((g) => Group.fromJson(g as Map<String, dynamic>))
+                .toList() ??
+            [];
+        final List<Player> importedPlayers =
+            playersJson
+                ?.map((p) => Player.fromJson(p as Map<String, dynamic>))
+                .toList() ??
+            [];
+
+        for (Player player in importedPlayers) {
+          await db.playerDao.addPlayer(player: player);
+        }
+
+        for (Group group in importedGroups) {
+          await db.groupDao.addGroup(group: group);
+        }
+
+        for (Game game in importedGames) {
+          await db.gameDao.addGame(game: game);
+        }
+      } else {
+        print('[importData] Invalid JSON schema');
+        return;
+      }
+      print('[importData] Data imported successfully');
+      return;
+    } on FormatException catch (e, stack) {
+      print('[importData] FormatException');
+      print('[importData] $e');
+      print(stack);
+      return;
+    } on Exception catch (e, stack) {
+      print('[importData] Exception');
+      print('[importData] $e');
+      print(stack);
+      return;
+    }
+  }
+
+  /// Helper method to read file content from either bytes or path
+  static Future<String> _readFileContent(PlatformFile file) async {
+    if (file.bytes != null) return utf8.decode(file.bytes!);
+    if (file.path != null) return await File(file.path!).readAsString();
+
+    throw Exception('Die Datei hat keinen lesbaren Inhalt');
+  }
+}