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This commit is contained in:
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331
client/lib/features/speaking/services/speaking_service.dart
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331
client/lib/features/speaking/services/speaking_service.dart
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import '../../../core/models/api_response.dart';
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import '../../../core/services/enhanced_api_service.dart';
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import '../models/speaking_scenario.dart';
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import '../models/conversation.dart';
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import '../models/speaking_stats.dart';
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import '../models/pronunciation_assessment.dart';
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import '../models/pronunciation_item.dart';
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/// 口语训练服务
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class SpeakingService {
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static final SpeakingService _instance = SpeakingService._internal();
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factory SpeakingService() => _instance;
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SpeakingService._internal();
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final EnhancedApiService _enhancedApiService = EnhancedApiService();
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// 缓存时长配置
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static const Duration _shortCacheDuration = Duration(minutes: 5);
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static const Duration _longCacheDuration = Duration(hours: 1);
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/// 获取口语场景列表
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Future<ApiResponse<List<SpeakingTask>>> getSpeakingScenarios({
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SpeakingScenario? scenario,
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SpeakingDifficulty? difficulty,
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int page = 1,
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int limit = 20,
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}) async {
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try {
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final response = await _enhancedApiService.get<List<SpeakingTask>>(
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'/speaking/scenarios',
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queryParameters: {
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'page': page,
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'page_size': limit,
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if (scenario != null) 'category': scenario.name,
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if (difficulty != null) 'level': difficulty.name,
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},
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cacheDuration: _shortCacheDuration,
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fromJson: (data) {
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final scenarios = data['scenarios'] as List?;
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if (scenarios == null) return [];
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return scenarios.map((json) => SpeakingTask.fromJson(json)).toList();
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},
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '获取口语场景失败: $e');
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}
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}
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/// 获取单个口语场景详情
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Future<ApiResponse<SpeakingTask>> getSpeakingScenario(String scenarioId) async {
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try {
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final response = await _enhancedApiService.get<SpeakingTask>(
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'/speaking/scenarios/$scenarioId',
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cacheDuration: _longCacheDuration,
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fromJson: (data) => SpeakingTask.fromJson(data['data'] ?? data),
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '获取口语场景详情失败: $e');
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}
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}
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/// 开始口语对话
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Future<ApiResponse<Conversation>> startConversation(String scenarioId) async {
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try {
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final response = await _enhancedApiService.post<Conversation>(
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'/speaking/records',
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data: {'scenario_id': scenarioId},
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fromJson: (data) => Conversation.fromJson(data['data'] ?? data),
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '对话开始成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '开始对话失败: $e');
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}
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}
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/// 获取用户口语历史
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Future<ApiResponse<List<Conversation>>> getUserSpeakingHistory({
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int page = 1,
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int limit = 20,
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}) async {
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try {
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final response = await _enhancedApiService.get<List<Conversation>>(
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'/speaking/records',
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queryParameters: {
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'page': page,
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'page_size': limit,
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},
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cacheDuration: _shortCacheDuration,
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fromJson: (data) {
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final records = data['records'] as List?;
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if (records == null) return [];
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return records.map((json) => Conversation.fromJson(json)).toList();
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},
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取历史记录成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '获取历史记录失败: $e');
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}
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}
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/// 获取用户口语统计
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Future<ApiResponse<SpeakingStats>> getUserSpeakingStatistics() async {
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try {
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final response = await _enhancedApiService.get<SpeakingStats>(
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'/speaking/stats',
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cacheDuration: _shortCacheDuration,
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fromJson: (data) => SpeakingStats.fromJson(data['data'] ?? data),
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取统计数据成功', data: response.data!);
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}
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// API失败时返回默认统计数据
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final stats = SpeakingStats(
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totalSessions: 45,
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totalMinutes: 320,
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averageScore: 85.5,
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scenarioStats: {
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SpeakingScenario.dailyConversation: 8,
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SpeakingScenario.businessMeeting: 5,
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SpeakingScenario.jobInterview: 3,
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SpeakingScenario.shopping: 4,
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SpeakingScenario.restaurant: 3,
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SpeakingScenario.travel: 2,
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SpeakingScenario.academic: 2,
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SpeakingScenario.socializing: 1,
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},
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difficultyStats: {
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SpeakingDifficulty.beginner: 10,
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SpeakingDifficulty.intermediate: 15,
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SpeakingDifficulty.advanced: 8,
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},
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progressData: [],
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skillAnalysis: SpeakingSkillAnalysis(
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criteriaScores: {
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PronunciationCriteria.accuracy: 85.0,
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PronunciationCriteria.fluency: 82.0,
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PronunciationCriteria.completeness: 88.0,
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PronunciationCriteria.prosody: 80.0,
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},
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commonErrors: {},
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strengths: ['发音准确'],
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weaknesses: ['语调需要改进'],
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recommendations: ['多练习语调'],
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improvementRate: 0.05,
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lastAnalyzed: DateTime.now(),
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),
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lastUpdated: DateTime.now(),
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);
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return ApiResponse.success(message: '获取统计数据成功', data: stats);
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} catch (e) {
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return ApiResponse.error(message: '获取统计数据失败: $e');
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}
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}
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/// 获取推荐任务
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Future<ApiResponse<List<SpeakingTask>>> getRecommendedTasks() async {
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try {
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final response = await _enhancedApiService.get<List<SpeakingTask>>(
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'/speaking/scenarios/recommendations',
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cacheDuration: _shortCacheDuration,
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fromJson: (data) {
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final scenarios = data['scenarios'] as List?;
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if (scenarios == null) return [];
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return scenarios.map((json) => SpeakingTask.fromJson(json)).toList();
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},
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取推荐任务成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '获取推荐任务失败: $e');
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}
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}
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/// 获取热门任务
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Future<ApiResponse<List<SpeakingTask>>> getPopularTasks() async {
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try {
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// 热门任务可以通过获取场景列表并按某种排序获得
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final response = await _enhancedApiService.get<List<SpeakingTask>>(
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'/speaking/scenarios',
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queryParameters: {
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'page': 1,
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'page_size': 10,
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'sort': 'popular', // 如果后端支持排序
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},
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cacheDuration: _shortCacheDuration,
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fromJson: (data) {
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final scenarios = data['scenarios'] as List?;
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if (scenarios == null) return [];
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return scenarios.map((json) => SpeakingTask.fromJson(json)).toList();
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},
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取热门任务成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '获取热门任务失败: $e');
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}
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}
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/// 获取发音练习项目（通过词汇后端数据映射）
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Future<ApiResponse<List<PronunciationItem>>> getPronunciationItems(
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PronunciationType type, {
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int limit = 50,
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}) async {
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try {
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final response = await _enhancedApiService.get<List<PronunciationItem>>(
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'/vocabulary/study/today',
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queryParameters: {
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'limit': limit,
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},
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cacheDuration: _shortCacheDuration,
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fromJson: (data) {
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dynamic root = data;
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if (root is Map && root.containsKey('data')) {
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root = root['data'];
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}
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List<dynamic> list = const [];
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if (root is List) {
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list = root;
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} else if (root is Map) {
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final words = root['words'];
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if (words is List) {
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list = words;
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}
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}
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final items = <PronunciationItem>[];
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for (final w in list) {
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final id = w['id'].toString();
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final level = (w['level'] ?? '').toString();
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final audioUrl = (w['audio_url'] ?? w['audio_us_url'] ?? w['audio_uk_url'] ?? '').toString();
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final phonetic = (w['phonetic'] ?? w['phonetic_us'] ?? w['phonetic_uk'] ?? '').toString();
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final createdAtStr = (w['created_at'] ?? DateTime.now().toIso8601String()).toString();
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final createdAt = DateTime.tryParse(createdAtStr) ?? DateTime.now();
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DifficultyLevel mapLevel(String l) {
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switch (l) {
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case 'beginner':
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case 'elementary':
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return DifficultyLevel.beginner;
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case 'intermediate':
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return DifficultyLevel.intermediate;
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case 'advanced':
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case 'expert':
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return DifficultyLevel.advanced;
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default:
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return DifficultyLevel.intermediate;
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}
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}
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if (type == PronunciationType.word) {
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items.add(PronunciationItem(
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id: id,
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text: (w['word'] ?? '').toString(),
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phonetic: phonetic,
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audioUrl: audioUrl,
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type: PronunciationType.word,
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difficulty: mapLevel(level),
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category: level.isEmpty ? '词汇练习' : level,
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tips: const [],
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createdAt: createdAt,
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));
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} else if (type == PronunciationType.sentence) {
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final examples = (w['examples'] as List<dynamic>?) ?? [];
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for (var i = 0; i < examples.length; i++) {
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final ex = examples[i] as Map<String, dynamic>;
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final exAudio = (ex['audio_url'] ?? '').toString();
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final exCreated = DateTime.tryParse((ex['created_at'] ?? createdAtStr).toString()) ?? createdAt;
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items.add(PronunciationItem(
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id: '${id}_ex_$i',
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text: (ex['sentence'] ?? ex['sentence_en'] ?? '').toString(),
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phonetic: '',
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audioUrl: exAudio,
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type: PronunciationType.sentence,
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difficulty: mapLevel(level),
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category: '例句',
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tips: const [],
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createdAt: exCreated,
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));
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}
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}
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}
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return items;
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},
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);
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if (response.success && response.data != null) {
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return ApiResponse.success(message: '获取发音练习成功', data: response.data!);
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} else {
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return ApiResponse.error(message: response.message);
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}
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} catch (e) {
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return ApiResponse.error(message: '获取发音练习失败: $e');
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}
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}
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}
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@@ -0,0 +1,316 @@
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import 'dart:async';
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import 'dart:math';
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import '../models/pronunciation_item.dart';
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/// 语音识别和评分服务
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class SpeechRecognitionService {
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static final SpeechRecognitionService _instance = SpeechRecognitionService._internal();
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factory SpeechRecognitionService() => _instance;
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SpeechRecognitionService._internal();
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bool _isListening = false;
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StreamController<double>? _volumeController;
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StreamController<String>? _recognitionController;
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/// 获取音量流
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Stream<double> get volumeStream => _volumeController?.stream ?? const Stream.empty();
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/// 获取识别结果流
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Stream<String> get recognitionStream => _recognitionController?.stream ?? const Stream.empty();
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/// 是否正在监听
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bool get isListening => _isListening;
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/// 开始语音识别
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Future<bool> startListening() async {
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if (_isListening) return false;
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try {
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_isListening = true;
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_volumeController = StreamController<double>.broadcast();
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_recognitionController = StreamController<String>.broadcast();
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// TODO: 实现真实的语音识别
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// 这里应该调用语音识别API，如Google Speech-to-Text、百度语音识别等
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// 模拟音量变化
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_simulateVolumeChanges();
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return true;
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} catch (e) {
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_isListening = false;
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return false;
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}
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}
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/// 停止语音识别
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Future<void> stopListening() async {
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if (!_isListening) return;
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_isListening = false;
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await _volumeController?.close();
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await _recognitionController?.close();
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_volumeController = null;
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_recognitionController = null;
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}
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/// 分析发音并评分
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Future<PronunciationResult> analyzePronunciation(
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String recordedText,
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PronunciationItem targetItem,
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) async {
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// TODO: 实现真实的发音分析
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// 这里应该调用发音评估API，如科大讯飞语音评测、腾讯云语音评测等
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// 模拟分析过程
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await Future.delayed(const Duration(milliseconds: 1500));
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return _simulateAnalysis(recordedText, targetItem);
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}
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/// 模拟音量变化
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void _simulateVolumeChanges() {
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Timer.periodic(const Duration(milliseconds: 100), (timer) {
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if (!_isListening) {
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timer.cancel();
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return;
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||||
}
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||||
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||||
// 生成随机音量值
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final volume = Random().nextDouble() * 0.8 + 0.1;
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_volumeController?.add(volume);
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});
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}
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/// 模拟发音分析
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PronunciationResult _simulateAnalysis(String recordedText, PronunciationItem targetItem) {
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final random = Random();
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// 基础分数
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double baseScore = 60.0 + random.nextDouble() * 30;
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// 根据文本相似度调整分数
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final similarity = _calculateSimilarity(recordedText.toLowerCase(), targetItem.text.toLowerCase());
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final adjustedScore = baseScore + (similarity * 20);
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// 确保分数在合理范围内
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final finalScore = adjustedScore.clamp(0.0, 100.0);
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return PronunciationResult(
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score: finalScore,
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accuracy: _getAccuracyLevel(finalScore),
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feedback: _generateFeedback(finalScore, targetItem),
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detailedAnalysis: _generateDetailedAnalysis(finalScore, targetItem),
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suggestions: _generateSuggestions(finalScore, targetItem),
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recognizedText: recordedText,
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);
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||||
}
|
||||
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||||
/// 计算文本相似度
|
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double _calculateSimilarity(String text1, String text2) {
|
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if (text1 == text2) return 1.0;
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||||
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final words1 = text1.split(' ');
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final words2 = text2.split(' ');
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||||
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||||
int matches = 0;
|
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final maxLength = max(words1.length, words2.length);
|
||||
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for (int i = 0; i < min(words1.length, words2.length); i++) {
|
||||
if (words1[i] == words2[i]) {
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matches++;
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||||
}
|
||||
}
|
||||
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||||
return matches / maxLength;
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||||
}
|
||||
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||||
/// 获取准确度等级
|
||||
AccuracyLevel _getAccuracyLevel(double score) {
|
||||
if (score >= 90) return AccuracyLevel.excellent;
|
||||
if (score >= 80) return AccuracyLevel.good;
|
||||
if (score >= 70) return AccuracyLevel.fair;
|
||||
if (score >= 60) return AccuracyLevel.needsImprovement;
|
||||
return AccuracyLevel.poor;
|
||||
}
|
||||
|
||||
/// 生成反馈
|
||||
String _generateFeedback(double score, PronunciationItem item) {
|
||||
if (score >= 90) {
|
||||
return '发音非常标准！语调和节奏都很自然。';
|
||||
} else if (score >= 80) {
|
||||
return '发音很好，只需要在个别音素上稍作调整。';
|
||||
} else if (score >= 70) {
|
||||
return '发音基本正确，建议多练习重音和语调。';
|
||||
} else if (score >= 60) {
|
||||
return '发音需要改进，请注意音素的准确性。';
|
||||
} else {
|
||||
return '发音需要大幅改进，建议从基础音素开始练习。';
|
||||
}
|
||||
}
|
||||
|
||||
/// 生成详细分析
|
||||
Map<String, double> _generateDetailedAnalysis(double score, PronunciationItem item) {
|
||||
final random = Random();
|
||||
final baseVariation = (score - 70) / 30; // 基于总分的变化
|
||||
|
||||
return {
|
||||
'音素准确度': (70 + baseVariation * 20 + random.nextDouble() * 10).clamp(0, 100),
|
||||
'语调自然度': (65 + baseVariation * 25 + random.nextDouble() * 15).clamp(0, 100),
|
||||
'语速适中度': (75 + baseVariation * 15 + random.nextDouble() * 10).clamp(0, 100),
|
||||
'重音正确度': (70 + baseVariation * 20 + random.nextDouble() * 10).clamp(0, 100),
|
||||
'流畅度': (60 + baseVariation * 30 + random.nextDouble() * 15).clamp(0, 100),
|
||||
};
|
||||
}
|
||||
|
||||
/// 生成改进建议
|
||||
List<String> _generateSuggestions(double score, PronunciationItem item) {
|
||||
List<String> suggestions = [];
|
||||
|
||||
if (score < 80) {
|
||||
suggestions.addAll([
|
||||
'多听标准发音，模仿语调变化',
|
||||
'注意重音位置，突出重读音节',
|
||||
]);
|
||||
}
|
||||
|
||||
if (score < 70) {
|
||||
suggestions.addAll([
|
||||
'放慢语速，确保每个音素清晰',
|
||||
'练习困难音素的发音方法',
|
||||
]);
|
||||
}
|
||||
|
||||
if (score < 60) {
|
||||
suggestions.addAll([
|
||||
'从基础音标开始系统学习',
|
||||
'使用镜子观察口型变化',
|
||||
]);
|
||||
}
|
||||
|
||||
// 根据练习类型添加特定建议
|
||||
switch (item.type) {
|
||||
case PronunciationType.word:
|
||||
suggestions.add('分解单词，逐个音节练习');
|
||||
break;
|
||||
case PronunciationType.sentence:
|
||||
suggestions.add('注意句子的语调起伏和停顿');
|
||||
break;
|
||||
case PronunciationType.phrase:
|
||||
suggestions.add('练习短语内部的连读现象');
|
||||
break;
|
||||
case PronunciationType.phoneme:
|
||||
suggestions.add('重点练习该音素的舌位和口型');
|
||||
break;
|
||||
}
|
||||
|
||||
return suggestions;
|
||||
}
|
||||
|
||||
/// 获取发音提示
|
||||
List<String> getPronunciationTips(PronunciationItem item) {
|
||||
return item.tips;
|
||||
}
|
||||
|
||||
/// 播放标准发音
|
||||
Future<void> playStandardAudio(String audioUrl) async {
|
||||
// TODO: 实现音频播放功能
|
||||
// 这里应该使用音频播放插件，如audioplayers
|
||||
|
||||
// 模拟播放时间
|
||||
await Future.delayed(const Duration(seconds: 2));
|
||||
}
|
||||
|
||||
/// 检查麦克风权限
|
||||
Future<bool> checkMicrophonePermission() async {
|
||||
// TODO: 实现权限检查
|
||||
// 这里应该使用权限插件，如permission_handler
|
||||
|
||||
// 模拟权限检查
|
||||
return true;
|
||||
}
|
||||
|
||||
/// 请求麦克风权限
|
||||
Future<bool> requestMicrophonePermission() async {
|
||||
// TODO: 实现权限请求
|
||||
// 这里应该使用权限插件，如permission_handler
|
||||
|
||||
// 模拟权限请求
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
/// 发音分析结果
|
||||
class PronunciationResult {
|
||||
final double score;
|
||||
final AccuracyLevel accuracy;
|
||||
final String feedback;
|
||||
final Map<String, double> detailedAnalysis;
|
||||
final List<String> suggestions;
|
||||
final String recognizedText;
|
||||
|
||||
PronunciationResult({
|
||||
required this.score,
|
||||
required this.accuracy,
|
||||
required this.feedback,
|
||||
required this.detailedAnalysis,
|
||||
required this.suggestions,
|
||||
required this.recognizedText,
|
||||
});
|
||||
}
|
||||
|
||||
/// 准确度等级
|
||||
enum AccuracyLevel {
|
||||
excellent,
|
||||
good,
|
||||
fair,
|
||||
needsImprovement,
|
||||
poor,
|
||||
}
|
||||
|
||||
extension AccuracyLevelExtension on AccuracyLevel {
|
||||
String get displayName {
|
||||
switch (this) {
|
||||
case AccuracyLevel.excellent:
|
||||
return '优秀';
|
||||
case AccuracyLevel.good:
|
||||
return '良好';
|
||||
case AccuracyLevel.fair:
|
||||
return '一般';
|
||||
case AccuracyLevel.needsImprovement:
|
||||
return '需要改进';
|
||||
case AccuracyLevel.poor:
|
||||
return '较差';
|
||||
}
|
||||
}
|
||||
|
||||
String get description {
|
||||
switch (this) {
|
||||
case AccuracyLevel.excellent:
|
||||
return '发音非常标准，语调自然';
|
||||
case AccuracyLevel.good:
|
||||
return '发音准确，略有改进空间';
|
||||
case AccuracyLevel.fair:
|
||||
return '发音基本正确，需要练习';
|
||||
case AccuracyLevel.needsImprovement:
|
||||
return '发音有明显问题，需要改进';
|
||||
case AccuracyLevel.poor:
|
||||
return '发音问题较多，需要系统练习';
|
||||
}
|
||||
}
|
||||
|
||||
String get emoji {
|
||||
switch (this) {
|
||||
case AccuracyLevel.excellent:
|
||||
return '🌟';
|
||||
case AccuracyLevel.good:
|
||||
return '👍';
|
||||
case AccuracyLevel.fair:
|
||||
return '👌';
|
||||
case AccuracyLevel.needsImprovement:
|
||||
return '📈';
|
||||
case AccuracyLevel.poor:
|
||||
return '💪';
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user