init

client/lib/features/speaking/providers/speaking_provider.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../models/speaking_scenario.dart';
+import '../models/conversation.dart';
+import '../services/speaking_service.dart';
+
+/// 口语任务状态
+class SpeakingTasksState {
+  final List<SpeakingTask> tasks;
+  final bool isLoading;
+  final String? error;
+
+  SpeakingTasksState({
+    this.tasks = const [],
+    this.isLoading = false,
+    this.error,
+  });
+
+  SpeakingTasksState copyWith({
+    List<SpeakingTask>? tasks,
+    bool? isLoading,
+    String? error,
+  }) {
+    return SpeakingTasksState(
+      tasks: tasks ?? this.tasks,
+      isLoading: isLoading ?? this.isLoading,
+      error: error,
+    );
+  }
+}
+
+/// 口语任务 Notifier
+class SpeakingTasksNotifier extends StateNotifier<SpeakingTasksState> {
+  final SpeakingService _speakingService;
+
+  SpeakingTasksNotifier(this._speakingService) : super(SpeakingTasksState());
+
+  /// 加载口语场景列表
+  Future<void> loadScenarios({
+    SpeakingScenario? scenario,
+    SpeakingDifficulty? difficulty,
+    int page = 1,
+  }) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final response = await _speakingService.getSpeakingScenarios(
+        scenario: scenario,
+        difficulty: difficulty,
+        page: page,
+      );
+      
+      if (response.success && response.data != null) {
+        state = state.copyWith(tasks: response.data!, isLoading: false);
+      } else {
+        state = state.copyWith(
+          isLoading: false,
+          error: response.message,
+        );
+      }
+    } catch (e) {
+      state = state.copyWith(
+        isLoading: false,
+        error: e.toString(),
+      );
+    }
+  }
+
+  /// 获取推荐任务
+  Future<void> loadRecommendedTasks() async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final response = await _speakingService.getRecommendedTasks();
+      
+      if (response.success && response.data != null) {
+        state = state.copyWith(tasks: response.data!, isLoading: false);
+      } else {
+        state = state.copyWith(
+          isLoading: false,
+          error: response.message,
+        );
+      }
+    } catch (e) {
+      state = state.copyWith(
+        isLoading: false,
+        error: e.toString(),
+      );
+    }
+  }
+}
+
+/// 口语服务 Provider
+final speakingServiceProvider = Provider<SpeakingService>((ref) {
+  return SpeakingService();
+});
+
+/// 口语任务列表 Provider
+final speakingTasksProvider = StateNotifierProvider<SpeakingTasksNotifier, SpeakingTasksState>((ref) {
+  final service = ref.watch(speakingServiceProvider);
+  return SpeakingTasksNotifier(service);
+});
+
+/// 推荐口语任务 Provider
+final recommendedSpeakingTasksProvider = FutureProvider<List<SpeakingTask>>((ref) async {
+  final service = ref.watch(speakingServiceProvider);
+  
+  try {
+    final response = await service.getRecommendedTasks();
+    return response.data ?? [];
+  } catch (e) {
+    return [];
+  }
+});
+
+/// 用户口语历史 Provider
+final userSpeakingHistoryProvider = FutureProvider<List<Conversation>>((ref) async {
+  final service = ref.watch(speakingServiceProvider);
+  
+  try {
+    final response = await service.getUserSpeakingHistory(limit: 5);
+    return response.data ?? [];
+  } catch (e) {
+    return [];
+  }
+});