Aniworld/instructions.md

Aniworld Web Application Development Instructions

This document provides detailed tasks for AI agents to implement a modern web application for the Aniworld anime download manager. All tasks should follow the coding guidelines specified in the project's copilot instructions.

Project Overview

The goal is to create a FastAPI-based web application that provides a modern interface for the existing Aniworld anime download functionality. The core anime logic should remain in SeriesApp.py while the web layer provides REST API endpoints and a responsive UI.

Architecture Principles

• Single Responsibility: Each file/class has one clear purpose
• Dependency Injection: Use FastAPI's dependency system
• Clean Separation: Web layer calls core logic, never the reverse
• File Size Limit: Maximum 500 lines per file
• Type Hints: Use comprehensive type annotations
• Error Handling: Proper exception handling and logging

Additional Implementation Guidelines

Code Style and Standards

• Type Hints: Use comprehensive type annotations throughout all modules
• Docstrings: Follow PEP 257 for function and class documentation
• Error Handling: Implement custom exception classes with meaningful messages
• Logging: Use structured logging with appropriate log levels
• Security: Validate all inputs and sanitize outputs
• Performance: Use async/await patterns for I/O operations

📞 Escalation

If you encounter:

• Architecture issues requiring design decisions
• Tests that conflict with documented requirements
• Breaking changes needed
• Unclear requirements or expectations

Document the issue and escalate rather than guessing.

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🎯 Current Task: Migrate Series Data from File Storage to Database

Background

The current implementation stores anime series metadata in data files (JSON format without .json extension) located in each series folder (e.g., {anime_directory}/{series_folder}/data). This task migrates that storage to the SQLite database using the existing AnimeSeries model.

Files Involved

Current Data File Storage:

• src/core/entities/series.py - Serie class with save_to_file() and load_from_file() methods
• src/core/entities/SerieList.py - SerieList class that loads/saves data files
• src/core/SerieScanner.py - Scanner that creates data files during scan

Database Components (Already Exist):

• src/server/database/models.py - AnimeSeries model (already defined)
• src/server/database/service.py - AnimeSeriesService with CRUD operations
• src/server/database/init.py - Database initialization

API Endpoints:

• src/server/api/anime.py - /api/anime/add endpoint that adds new series

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Task 1: Create Data File Migration Service ✅

File: src/server/services/data_migration_service.py

Description: Create a service that migrates existing data files to the database.

Requirements:

1. Create DataMigrationService class with the following methods:

   • scan_for_data_files(anime_directory: str) -> List[Path] - Find all data files in the anime directory
   • migrate_data_file(data_path: Path, db: AsyncSession) -> bool - Migrate single data file to DB
   • migrate_all(anime_directory: str, db: AsyncSession) -> MigrationResult - Migrate all found data files
   • is_migration_needed(anime_directory: str) -> bool - Check if there are data files to migrate

2. Migration logic:

   • Read the data file using Serie.load_from_file()
   • Check if series with same key already exists in DB using AnimeSeriesService.get_by_key()
   • If not exists, create new AnimeSeries record using AnimeSeriesService.create()
   • If exists, optionally update the episode_dict if it has changed
   • Log all operations with appropriate log levels

3. Create MigrationResult dataclass:

   @dataclass
   class MigrationResult:
       total_found: int
       migrated: int
       skipped: int
       failed: int
       errors: List[str]
   

4. Handle errors gracefully - don't stop migration on individual file failures

Testing Requirements:

• Unit tests in tests/unit/test_data_migration_service.py
• Test data file scanning
• Test single file migration
• Test migration when series already exists
• Test error handling for corrupted files

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Task 2: Create Startup Migration Script ✅

File: src/server/services/startup_migration.py

Description: Create a migration runner that executes on every application startup.

Requirements:

1. Create run_startup_migration(anime_directory: str) -> MigrationResult async function

2. This function should:

   • Check if migration is needed using DataMigrationService.is_migration_needed()
   • If needed, run DataMigrationService.migrate_all()
   • Log migration results
   • Return the MigrationResult

3. Create ensure_migration_on_startup() async function that:

   • Gets the anime directory from settings/config
   • Runs run_startup_migration() if directory is configured
   • Handles cases where directory is not yet configured (first run)

Testing Requirements:

• Unit tests in tests/unit/test_startup_migration.py
• Test migration runs when data files exist
• Test migration skips when no data files exist
• Test handling of unconfigured anime directory

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Task 3: Integrate Migration into FastAPI Lifespan ✅

File: src/server/fastapi_app.py

Description: Add the startup migration to the FastAPI application lifespan.

Requirements:

1. Import ensure_migration_on_startup from startup migration service
2. Call await ensure_migration_on_startup() in the lifespan function after config is loaded
3. Log migration results
4. Do NOT block application startup on migration failure - log error and continue

Example Integration:

@asynccontextmanager
async def lifespan(app: FastAPI):
    # ... existing startup code ...

    # Run data file to database migration
    try:
        from src.server.services.startup_migration import ensure_migration_on_startup
        migration_result = await ensure_migration_on_startup()
        if migration_result:
            logger.info(
                "Data migration complete: %d migrated, %d skipped, %d failed",
                migration_result.migrated,
                migration_result.skipped,
                migration_result.failed
            )
    except Exception as e:
        logger.error("Data migration failed: %s", e, exc_info=True)
        # Continue startup - migration failure should not block app

    # ... rest of startup ...

Testing Requirements:

• Integration test that verifies migration runs on startup
• Test that app starts even if migration fails

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Task 4: Update SerieList to Use Database ✅

File: src/core/entities/SerieList.py

Description: Modify SerieList class to read from database instead of data files.

Requirements:

1. Add optional db_session parameter to __init__

2. Modify load_series() method:

   • If db_session is provided, load from database using AnimeSeriesService.get_all()
   • Convert AnimeSeries models to Serie objects
   • Fall back to file-based loading if no db_session (for backward compatibility)

3. Modify add() method:

   • If db_session is provided, save to database using AnimeSeriesService.create()
   • Do NOT create data files anymore
   • Fall back to file-based saving if no db_session

4. Add new method load_series_from_db(db: AsyncSession) -> None

5. Add new method add_to_db(serie: Serie, db: AsyncSession) -> None

Important: Keep backward compatibility - file-based operations should still work when no db_session is provided.

Testing Requirements:

• Unit tests for database-based loading
• Unit tests for database-based adding
• Test backward compatibility with file-based operations
• Test conversion between AnimeSeries model and Serie entity

---

Task 5: Update SerieScanner to Use Database ⬜

File: src/core/SerieScanner.py

Description: Modify SerieScanner to save scan results to database instead of data files.

Requirements:

1. Add optional db_session parameter to __init__

2. Modify scanning logic (around line 185-188):

   • If db_session is provided, save to database instead of file
   • Use AnimeSeriesService.create() or AnimeSeriesService.update() for upserting
   • Do NOT create data files anymore when using database

3. Create helper method _save_serie_to_db(serie: Serie, db: AsyncSession) -> None

4. Create helper method _update_serie_in_db(serie: Serie, db: AsyncSession) -> None

Important: Keep backward compatibility for CLI usage without database.

Testing Requirements:

• Unit tests for database-based saving during scan
• Test that scan results persist to database
• Test upsert behavior (update existing series)

---

Task 6: Update Anime API Endpoints ⬜

File: src/server/api/anime.py

Description: Update the /api/anime/add endpoint to save to database instead of file.

Requirements:

1. Modify add_series() endpoint:

   • Get database session using dependency injection
   • Use AnimeSeriesService.create() to save new series
   • Remove or replace file-based series_app.list.add(serie) call
   • Return the created series info including database ID

2. Add database session dependency:

   from src.server.database import get_db_session
   
   @router.post("/add")
   async def add_series(
       request: AddSeriesRequest,
       _auth: dict = Depends(require_auth),
       series_app: Any = Depends(get_series_app),
       db: AsyncSession = Depends(get_db_session),
   ) -> dict:
   

3. Update list/get endpoints to optionally read from database

Testing Requirements:

• API test for adding series via database
• Test that added series appears in database
• Test duplicate key handling

---

Task 7: Update Dependencies and SeriesApp ⬜

File: src/server/utils/dependencies.py and src/core/SeriesApp.py

Description: Update dependency injection to provide database sessions to core components.

Requirements:

1. Update get_series_app() dependency:

   • Initialize SerieList with database session when available
   • Pass database session to SerieScanner when available

2. Create get_series_app_with_db() dependency that provides database-aware SeriesApp

3. Update SeriesApp.__init__():

   • Add optional db_session parameter
   • Pass to SerieList and SerieScanner

Testing Requirements:

• Test SeriesApp initialization with database session
• Test dependency injection provides correct sessions

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Task 8: Write Integration Tests ⬜

File: tests/integration/test_data_file_migration.py

Description: Create comprehensive integration tests for the migration workflow.

Test Cases:

1. test_migration_on_fresh_start - No data files, no database entries
2. test_migration_with_existing_data_files - Data files exist, migrate to DB
3. test_migration_skips_existing_db_entries - Series already in DB, skip migration
4. test_add_series_saves_to_database - New series via API saves to DB
5. test_scan_saves_to_database - Scan results save to DB
6. test_list_reads_from_database - Series list reads from DB
7. test_search_and_add_workflow - Search -> Add -> Verify in DB

Setup:

• Use pytest fixtures with temporary directories
• Use test database (in-memory SQLite)
• Create sample data files for migration tests

---

Task 9: Clean Up Legacy Code ⬜

Description: Remove or deprecate file-based storage code after database migration is stable.

Requirements:

1. Add deprecation warnings to file-based methods:

   • Serie.save_to_file() - Add warnings.warn() with deprecation notice
   • Serie.load_from_file() - Add warnings.warn() with deprecation notice
   • SerieList.add() file path - Log deprecation when creating data files

2. Update documentation:

   • Document that data files are deprecated
   • Document database storage as the primary method
   • Update infrastructure.md with new architecture

3. Do NOT remove file-based code yet - keep for backward compatibility

Testing Requirements:

• Test that deprecation warnings are raised
• Verify existing file-based tests still pass

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Task 10: Final Validation ⬜

Description: Validate the complete migration implementation.

Validation Checklist:

• All unit tests pass: conda run -n AniWorld python -m pytest tests/unit/ -v
• All integration tests pass: conda run -n AniWorld python -m pytest tests/integration/ -v
• All API tests pass: conda run -n AniWorld python -m pytest tests/api/ -v
• Migration runs automatically on server startup
• New series added via API are saved to database
• Scan results are saved to database
• Series list is read from database
• Existing data files are migrated to database on first run
• Application starts successfully even with no data files
• Application starts successfully even with no anime directory configured
• Deprecation warnings appear in logs when file-based methods are used
• No new data files are created after migration

Manual Testing:

1. Start fresh server: conda run -n AniWorld python -m uvicorn src.server.fastapi_app:app --host 127.0.0.1 --port 8000 --reload
2. Login and configure anime directory
3. Run rescan - verify series appear in database
4. Search and add new series - verify saved to database
5. Restart server - verify migration detects no new files to migrate
6. Check database for all series entries

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📚 Helpful Commands

# Run all tests
conda run -n AniWorld python -m pytest tests/ -v --tb=short

# Run specific test file
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py -v

# Run specific test class
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py::TestWebSocketService -v

# Run specific test
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py::TestWebSocketService::test_broadcast_download_progress -v

# Run with extra verbosity
conda run -n AniWorld python -m pytest tests/ -vv

# Run with full traceback
conda run -n AniWorld python -m pytest tests/ -v --tb=long

# Run and stop at first failure
conda run -n AniWorld python -m pytest tests/ -v -x

# Run tests matching pattern
conda run -n AniWorld python -m pytest tests/ -v -k "auth"

# Show all print statements
conda run -n AniWorld python -m pytest tests/ -v -s

#Run app
conda run -n AniWorld python -m uvicorn src.server.fastapi_app:app --host 127.0.0.1 --port 8000 --reload

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Final Implementation Notes

1. Incremental Development: Implement features incrementally, testing each component thoroughly before moving to the next
2. Code Review: Review all generated code for adherence to project standards
3. Documentation: Document all public APIs and complex logic
4. Testing: Maintain test coverage above 80% for all new code
5. Performance: Profile and optimize critical paths, especially download and streaming operations
6. Security: Regular security audits and dependency updates
7. Monitoring: Implement comprehensive monitoring and alerting
8. Maintenance: Plan for regular maintenance and updates

Task Completion Checklist

For each task completed:

• Implementation follows coding standards
• Unit tests written and passing
• Integration tests passing
• Documentation updated
• Error handling implemented
• Logging added
• Security considerations addressed
• Performance validated
• Code reviewed
• Task marked as complete in instructions.md
• Infrastructure.md updated
• Changes committed to git; keep your messages in git short and clear
• Take the next task

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Prerequisites

1. Server is running: conda run -n AniWorld python -m uvicorn src.server.fastapi_app:app --host 127.0.0.1 --port 8000 --reload
2. Password: Hallo123!
3. Login via browser at http://127.0.0.1:8000/login

Notes

• This is a simplification that removes complexity while maintaining core functionality
• Improves user experience with explicit manual control
• Easier to understand, test, and maintain
• Good foundation for future enhancements if needed

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