clean(code): refractor and clean up code

Author: sikelio

lib/exceptions/rate_limit_exception.dart

@@ -0,0 +1,26 @@
+/*
+ * Music Sharity - Share music across all platforms
+ * Copyright (C) 2026 Sikelio (Byte Roast)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+class RateLimitException implements Exception {
+  final String message;
+  final Duration waitTime;
+
+  RateLimitException(this.message, this.waitTime);
+
+  @override
+  String toString() => message;
+}

lib/models/odesli_result.dart

@@ -0,0 +1,25 @@
+/*
+ * Music Sharity - Share music across all platforms
+ * Copyright (C) 2026 Sikelio (Byte Roast)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+import 'track_metadata.dart';
+
+class OdesliResult {
+  final Map<String, String> platformLinks;
+  final TrackMetadata? metadata;
+
+  OdesliResult({required this.platformLinks, this.metadata});
+}

lib/pages/conversion_page.dart

@@ -21,12 +21,12 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:music_sharity/services/conversion_history_service.dart';
 import 'package:share_plus/share_plus.dart';
+import '../exceptions/rate_limit_exception.dart';
 import '../models/music_link.dart';
 import '../models/music_platform.dart';
+import '../models/odesli_result.dart';
 import '../pages/home_page.dart';
 import '../services/music_converter_service.dart';
-import '../services/odesli_service.dart';
-import '../services/rate_limiter_service.dart';
 import '../utils/ui_helpers.dart';
 import '../widgets/platform_card.dart';
 import '../widgets/rate_limit_indicator.dart';

lib/services/music_converter_service.dart

@@ -17,6 +17,7 @@
  */
 import 'odesli_service.dart';
 import '../models/music_link.dart';
+import '../models/odesli_result.dart';
 
 class MusicConverterService {
   final OdesliService _odesliService = OdesliService();

lib/services/odesli_service.dart

@@ -19,15 +19,10 @@ import 'dart:convert';
 import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:http/http.dart' as http;
 import 'rate_limiter_service.dart';
+import '../exceptions/rate_limit_exception.dart';
+import '../models/odesli_result.dart';
 import '../models/track_metadata.dart';
 
-class OdesliResult {
-  final Map<String, String> platformLinks;
-  final TrackMetadata? metadata;
-
-  OdesliResult({required this.platformLinks, this.metadata});
-}
-
 class OdesliService {
   static const String _baseUrl = 'https://api.song.link/v1-alpha.1/links';
   static const String _cloudflareWorkerUrl =

lib/services/rate_limiter_service.dart

@@ -17,8 +17,13 @@
  */
 import 'dart:async';
 import 'package:shared_preferences/shared_preferences.dart';
+import '../exceptions/rate_limit_exception.dart';
 
 class RateLimiterService {
+  static final RateLimiterService _instance = RateLimiterService._internal();
+  factory RateLimiterService() => _instance;
+  RateLimiterService._internal();
+
   static const int maxRequests = 10;
   static const Duration windowDuration = Duration(minutes: 1);
   static const String _storageKey = 'rate_limiter_timestamps';
@@ -30,12 +35,6 @@ class RateLimiterService {
   bool _isInitialized = false;
   Completer<void>? _initializationCompleter;
 
-  static final RateLimiterService _instance = RateLimiterService._internal();
-
-  factory RateLimiterService() => _instance;
-
-  RateLimiterService._internal();
-
   Future<void> _loadTimestamps() async {
     if (_isInitialized) return;
 
@@ -156,13 +155,3 @@ class RateLimiterService {
     _quotaController.close();
   }
 }
-
-class RateLimitException implements Exception {
-  final String message;
-  final Duration waitTime;
-
-  RateLimitException(this.message, this.waitTime);
-
-  @override
-  String toString() => message;
-}