init

client/lib/features/writing/services/writing_service.dart

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+import '../models/writing_task.dart';
+import '../models/writing_submission.dart';
+import '../models/writing_stats.dart';
+import '../../../core/network/api_client.dart';
+import '../../../core/network/api_endpoints.dart';
+import '../../../core/services/enhanced_api_service.dart';
+import '../../../core/models/api_response.dart';
+import '../models/writing_task.dart';
+import '../models/writing_submission.dart';
+import '../models/writing_stats.dart';
+
+/// 写作训练服务
+class WritingService {
+  final EnhancedApiService _enhancedApiService = EnhancedApiService();
+  
+  // 缓存时长配置
+  static const Duration _shortCacheDuration = Duration(minutes: 5);
+  static const Duration _longCacheDuration = Duration(hours: 1);
+
+  /// 获取写作任务列表
+  Future<List<WritingTask>> getWritingTasks({
+    WritingType? type,
+    WritingDifficulty? difficulty,
+    int page = 1,
+    int limit = 20,
+    bool forceRefresh = false,
+  }) async {
+    try {
+      final response = await _enhancedApiService.get<List<WritingTask>>(
+        ApiEndpoints.writingPrompts,
+        queryParameters: {
+          'page': page,
+          'limit': limit,
+          if (type != null) 'type': type.name,
+          if (difficulty != null) 'difficulty': difficulty.name,
+        },
+        useCache: !forceRefresh,
+        cacheDuration: _shortCacheDuration,
+        fromJson: (data) {
+          final List<dynamic> list = data['data'] ?? [];
+          return list.map((json) => WritingTask.fromJson(json)).toList();
+        },
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('获取写作任务失败: $e');
+    }
+  }
+
+  /// 获取单个写作任务详情
+  Future<WritingTask> getWritingTask(String taskId) async {
+    try {
+      final response = await _enhancedApiService.get<WritingTask>(
+        '${ApiEndpoints.writingPrompts}/$taskId',
+        cacheDuration: _longCacheDuration,
+        fromJson: (data) => WritingTask.fromJson(data['data']),
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('获取写作任务详情失败: $e');
+    }
+  }
+
+  /// 提交写作作业
+  Future<WritingSubmission> submitWriting({
+    required String taskId,
+    required String userId,
+    required String content,
+    required int timeSpent,
+    required int wordCount,
+  }) async {
+    try {
+      final response = await _enhancedApiService.post<WritingSubmission>(
+        ApiEndpoints.writingSubmissions,
+        data: {
+          'prompt_id': taskId,
+          'user_id': userId,
+          'content': content,
+          'time_spent': timeSpent,
+          'word_count': wordCount,
+        },
+        fromJson: (data) => WritingSubmission.fromJson(data['data']),
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('提交写作作业失败: $e');
+    }
+  }
+
+  /// 获取用户写作历史
+  Future<List<WritingSubmission>> getUserWritingHistory({
+    required String userId,
+    int page = 1,
+    int limit = 20,
+    bool forceRefresh = false,
+  }) async {
+    try {
+      final response = await _enhancedApiService.get<List<WritingSubmission>>(
+        ApiEndpoints.writingSubmissions,
+        queryParameters: {
+          'page': page,
+          'limit': limit,
+        },
+        useCache: !forceRefresh,
+        cacheDuration: _shortCacheDuration,
+        fromJson: (data) {
+          final List<dynamic> list = data['data'] ?? [];
+          return list.map((json) => WritingSubmission.fromJson(json)).toList();
+        },
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('获取写作历史失败: $e');
+    }
+  }
+
+  /// 获取用户写作统计
+  Future<WritingStats> getUserWritingStats(String userId, {bool forceRefresh = false}) async {
+    try {
+      final response = await _enhancedApiService.get<WritingStats>(
+        ApiEndpoints.writingStats,
+        useCache: !forceRefresh,
+        cacheDuration: _shortCacheDuration,
+        fromJson: (data) => WritingStats.fromJson(data['data']),
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('获取写作统计失败: $e');
+    }
+  }
+
+  /// 获取写作反馈
+  Future<WritingSubmission> getWritingFeedback(String submissionId) async {
+    try {
+      final response = await _enhancedApiService.get<WritingSubmission>(
+        '${ApiEndpoints.writingSubmissions}/$submissionId',
+        cacheDuration: _shortCacheDuration,
+        fromJson: (data) => WritingSubmission.fromJson(data['data']),
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('获取写作反馈失败: $e');
+    }
+  }
+
+  /// 搜索写作任务
+  Future<List<WritingTask>> searchWritingTasks({
+    required String query,
+    WritingType? type,
+    WritingDifficulty? difficulty,
+    int page = 1,
+    int limit = 20,
+    bool forceRefresh = false,
+  }) async {
+    try {
+      final response = await _enhancedApiService.get<List<WritingTask>>(
+        '${ApiEndpoints.writingPrompts}/search',
+        queryParameters: {
+          'q': query,
+          'page': page,
+          'limit': limit,
+          if (type != null) 'type': type.name,
+          if (difficulty != null) 'difficulty': difficulty.name,
+        },
+        useCache: !forceRefresh,
+        cacheDuration: _shortCacheDuration,
+        fromJson: (data) {
+          final List<dynamic> list = data['data'] ?? [];
+          return list.map((json) => WritingTask.fromJson(json)).toList();
+        },
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('搜索写作任务失败: $e');
+    }
+  }
+
+  /// 获取推荐的写作任务
+  Future<List<WritingTask>> getRecommendedWritingTasks({
+    required String userId,
+    int limit = 10,
+    bool forceRefresh = false,
+  }) async {
+    try {
+      final response = await _enhancedApiService.get<List<WritingTask>>(
+        '${ApiEndpoints.writingPrompts}/recommendations',
+        queryParameters: {
+          'limit': limit,
+        },
+        useCache: !forceRefresh,
+        cacheDuration: _shortCacheDuration,
+        fromJson: (data) {
+          final List<dynamic> list = data['data'] ?? [];
+          return list.map((json) => WritingTask.fromJson(json)).toList();
+        },
+      );
+      
+      if (response.success && response.data != null) {
+        return response.data!;
+      } else {
+        throw Exception(response.message);
+      }
+    } catch (e) {
+      throw Exception('获取推荐写作任务失败: $e');
+    }
+  }
+}