Implement story integration backend services:
- Create StoryService (Application/Services/StoryService.cs) with full CRUD operations
- Create StoryGenerationService (Application/Services/StoryGenerationService.cs) for AI-powered story generation
- Uses IMistralService for text generation
- Uses ITtsService for audio generation
- Splits stories into segments per lesson
- Create StoryUnlockService (Application/Services/StoryUnlockService.cs) for progress management
- Handles lesson completion → story segment unlocking
- Create StoryController (Presentation/Controllers/StoryController.cs) with 12 endpoints:
- GET /api/story/levels - list levels with stories
- GET /api/story/levels/{levelId}/segments - get segments for level
- GET /api/story/segments/{id} - get specific segment
- POST /api/story/segments - create segment (Admin)
- PUT /api/story/segments/{id} - update segment (Admin)
- DELETE /api/story/segments/{id} - delete segment (Admin)
- POST /api/story/levels/{levelId}/generate - generate story with AI (Admin)
- POST /api/story/segments/{segmentId}/audio - generate audio (Admin)
- GET /api/story/levels/{levelId}/progress - get user progress
- POST /api/story/segments/{segmentId}/complete - mark as completed
- GET /api/story/levels/{levelId}/next - get next segment
- GET /api/story/segments/{segmentId}/unlocked - check if unlocked
- GET /api/story/segments/{segmentId}/audio - get audio URL
- GET /api/story/levels/{levelId}/lessons-with-stories - get lessons with story status
- Register all services in Program.cs DI container
- Update feature document to reflect Phase 2 completion
Next: Phase 3 - AI Integration (unit tests for services)
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Phase 3 Tasks Completed:
- Added model directory validation to VoskService constructor
- Added configuration validation to TtsService constructor
- Added comprehensive setup instructions to VoskConfig and CoquiConfig
- Added AI Model Setup Guide to docs/features/ai-services.md with:
- Vosk model download and setup instructions
- Coqui TTS model download and setup instructions
- Mistral API configuration guide
- Verification commands
- Troubleshooting table
- Updated appsettings.json and appsettings.Development.json with comments
All configuration is now validated on service startup with helpful error messages
that guide users to download and configure the required models.
Build: Success
Tests: 296 passing (148 unit + 148 integration)
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- Add QuizQuestion and QuizOption domain entities with QuestionType enum
- Add IQuizQuestionRepository and IQuizOptionRepository interfaces
- Add QuizQuestionRepository and QuizOptionRepository EF Core implementations
- Add QuizQuestionService with CRUD, quiz submission, and statistics
- Add QuizQuestionsController with comprehensive REST API endpoints
- Add QuizQuestionDto and related DTOs for API communication
- Add EF Core migration (20260612050652_AddQuizQuestionTables) for QuizQuestion and QuizOption
- Add seed data with sample quiz questions for Greetings, Numbers, Grammar lessons
- Update AppDbContext with DbSets and entity configurations
- Update Program.cs with migration retry logic for Docker
- Update docker-compose.yml with SeedDatabase configuration
- Add unit tests for QuizQuestionService
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- Add Domain/Interfaces/IMistralConnector.cs with AiServiceException and AiErrorCode enum
- Add Infrastructure/Configuration/MistralConfig.cs with validation
- Add Infrastructure/Services/MistralConnector.cs with HTTP client implementation
- Add Infrastructure/Services/MistralRateLimiter.cs for rate limiting
- Add Infrastructure/Services/MistralCircuitBreaker.cs for circuit breaker pattern
- Add Application/Models/MistralRequest.cs with request models
- Add Application/Models/MistralResponse.cs with response models
- Update Program.cs to register IMistralConnector with MemoryCache, HttpClient, and config
- Update GermanApp.csproj with existing dependencies
- Update docs/features/ai-services.md with Phase 0 completion
Phase 0 of AI Services feature is complete. Mistral API Connector is ready for use by MistralService.
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- Created migration 20260607192743_AddLessonManagementTables
- Renames old 'Level' column to 'Order' in Lessons table
- Adds LevelId, Topic, IsActive columns to Lessons
- Creates Levels table with Id, Name, Code, Order
- Creates UserProgress table with UserId, LessonId, IsCompleted, QuizScore, LastAttemptDate
- Adds foreign key from Lessons to Levels
- Adds foreign keys from UserProgress to Users and Lessons
- Adds unique indexes for Level.Code, Level.Order, Lesson.LevelId_Order, UserProgress.UserId_LessonId
- Temporarily commented out seeding during migration creation to avoid EF Core tooling issues
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- Updated Lesson entity to use LevelId (int) instead of Level (int)
- Added navigation property Level (Level entity)
- Added Order, Topic, and IsActive properties to Lesson
- Updated Lesson.Create() factory method signature to accept levelId, title, order, topic, description
- Split Update method into individual property update methods
- Updated LessonDto to use LevelId, LevelName, LevelCode instead of Level int
- Added CreateLessonDto and UpdateLessonDto with all required fields
- Added UpdateFromDto extension method for Lesson
- Updated CreateLessonCommand to validate LevelId instead of Level
- Updated SeedDataExtension to seed Level entities first, then use new Lesson.Create() signature
- Made SeedDatabaseAsync async and updated Program.cs to await it
- Updated LessonsEndpoints to use GetByLevelAsync for beginner/advanced queries
- Fixed missing using directive for Domain.Entities
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- Fix MSTest compatibility with .NET 9.0 by upgrading to MSTest.TestFramework 4.2.3
- Move Tests directory to solution level (Tests/) to prevent test files from being compiled with GermanApp
- Update test project references to point to GermanApp/GermanApp.csproj
- Add InternalsVisibleTo attributes for test assemblies
- Make RefreshToken properties internal for testability
- Fix User.ChangeEmail null handling
- Add 46 comprehensive unit tests for User and RefreshToken domain entities
- All tests passing successfully
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- Create User entity with gamification fields (Level, Streak, Points)
- Add User DbSet to AppDbContext with proper configuration
- Create initial database migration with Users and Lessons tables
- Add SeedData extension for initial admin user and sample lessons
- Update Program.cs to use seed data method
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