libretranslatr

lib/services/translate_service.dart

@@ -0,0 +1,125 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import '../models/language.dart';
+import 'settings_service.dart';
+
+class TranslateException implements Exception {
+  final String message;
+  TranslateException(this.message);
+  @override
+  String toString() => message;
+}
+
+class DetectResult {
+  final String language;
+  final int confidence;
+  DetectResult({required this.language, required this.confidence});
+}
+
+/// Kullanıcının kendi sunucusundaki LibreTranslate API'sine istek atar.
+class TranslateService {
+  final SettingsService _settings;
+  TranslateService(this._settings);
+
+  Future<String> _baseUrl() async {
+    final url = await _settings.getServerUrl();
+    if (url == null || url.isEmpty) {
+      throw TranslateException('Sunucu adresi ayarlanmamış. Ayarlar\'dan ekleyin.');
+    }
+    return url;
+  }
+
+  Map<String, dynamic> _withApiKey(Map<String, dynamic> body, String? apiKey) {
+    if (apiKey != null && apiKey.isNotEmpty) {
+      body['api_key'] = apiKey;
+    }
+    return body;
+  }
+
+  String _errorFromBody(String body, int statusCode) {
+    try {
+      final decoded = jsonDecode(body);
+      if (decoded is Map && decoded['error'] != null) {
+        return decoded['error'].toString();
+      }
+    } catch (_) {
+      // JSON değilse aşağıda genel mesaj kullanılır.
+    }
+    return 'Sunucu hatası (HTTP $statusCode)';
+  }
+
+  /// Sunucuya bağlanıp desteklenen dilleri getirir.
+  /// Hem "bağlantı testi" hem de dil listesini doldurmak için kullanılır.
+  Future<List<Language>> fetchLanguages() async {
+    final base = await _baseUrl();
+    final apiKey = await _settings.getApiKey();
+    final uri = Uri.parse('$base/languages').replace(
+      queryParameters: apiKey != null ? {'api_key': apiKey} : null,
+    );
+
+    final res = await http.get(uri).timeout(const Duration(seconds: 10));
+    if (res.statusCode != 200) {
+      throw TranslateException(_errorFromBody(res.body, res.statusCode));
+    }
+    final List<dynamic> data = jsonDecode(utf8.decode(res.bodyBytes));
+    return data.map((e) => Language.fromJson(e as Map<String, dynamic>)).toList();
+  }
+
+  Future<String> translate({
+    required String text,
+    required String sourceLang,
+    required String targetLang,
+  }) async {
+    if (text.trim().isEmpty) return '';
+    final base = await _baseUrl();
+    final apiKey = await _settings.getApiKey();
+
+    final body = _withApiKey({
+      'q': text,
+      'source': sourceLang,
+      'target': targetLang,
+      'format': 'text',
+    }, apiKey);
+
+    final res = await http
+        .post(
+          Uri.parse('$base/translate'),
+          headers: {'Content-Type': 'application/json'},
+          body: jsonEncode(body),
+        )
+        .timeout(const Duration(seconds: 15));
+
+    if (res.statusCode != 200) {
+      throw TranslateException(_errorFromBody(res.body, res.statusCode));
+    }
+    final decoded = jsonDecode(utf8.decode(res.bodyBytes));
+    return decoded['translatedText'] as String;
+  }
+
+  Future<DetectResult?> detect(String text) async {
+    if (text.trim().isEmpty) return null;
+    final base = await _baseUrl();
+    final apiKey = await _settings.getApiKey();
+
+    final body = _withApiKey({'q': text}, apiKey);
+
+    final res = await http
+        .post(
+          Uri.parse('$base/detect'),
+          headers: {'Content-Type': 'application/json'},
+          body: jsonEncode(body),
+        )
+        .timeout(const Duration(seconds: 10));
+
+    if (res.statusCode != 200) {
+      throw TranslateException(_errorFromBody(res.body, res.statusCode));
+    }
+    final List<dynamic> data = jsonDecode(utf8.decode(res.bodyBytes));
+    if (data.isEmpty) return null;
+    final best = data.first as Map<String, dynamic>;
+    return DetectResult(
+      language: best['language'] as String,
+      confidence: ((best['confidence'] ?? 0) as num).round(),
+    );
+  }
+}