# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

Ohm Stream Downloader is a FastAPI-based web application for downloading anime episodes and media files from various file hosting services (1fichier, Doodstream, Rapidfile, Uptobox, VidMoly, SendVid, Sibnet, Lpayer) and anime streaming platforms (Anime-Sama, Neko-Sama, Anime-Ultime, Vostfree). It features a modern web interface, parallel downloads, pause/resume support, video streaming, and personalized recommendations.

## Development Commands

```bash
# Create and activate virtual environment
python3 -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install dependencies
pip install -r requirements.txt

# Run development server (auto-reload)
uvicorn main:app --reload --host 0.0.0.0 --port 3000

# Access web interface
# Open http://localhost:3000/web in browser

# Run all tests
pytest

# Run tests with coverage report
pytest --cov=app --cov-report=html

# Run only unit tests (fast, isolated)
pytest -m "unit"

# Run only integration tests
pytest -m "integration"

# Exclude slow tests
pytest -m "not slow"

# Verbose output
pytest -v

# Show print debugging
pytest -s
```

## Architecture

**Directory Structure:**
```
Ohm_streaming/
├── main.py                      # FastAPI application & API endpoints
├── app/
│   ├── models/                  # Pydantic models (DownloadTask, AnimeMetadata, etc.)
│   ├── downloaders/             # Host-specific downloaders
│   │   ├── base.py              # BaseDownloader abstract class
│   │   ├── unfichier.py         # 1fichier.com handler
│   │   ├── doodstream.py        # Doodstream handler
│   │   ├── rapidfile.py         # Rapidfile handler
│   │   ├── uptobox.py           # Uptobox handler
│   │   ├── vidmoly.py           # VidMoly handler
│   │   ├── sendvid.py           # SendVid handler
│   │   ├── sibnet.py            # Sibnet handler
│   │   ├── lpayer.py            # Lpayer handler
│   │   ├── vidmoly_old.py       # Old VidMoly implementation (deprecated)
│   │   ├── animesama.py         # Anime-Sama (anime provider)
│   │   ├── animeultime.py       # Anime-Ultime (anime provider)
│   │   ├── nekosama.py          # Neko-Sama (anime provider)
│   │   ├── vostfree.py          # Vostfree (anime provider)
│   │   └── __init__.py          # Factory function and registry
│   ├── providers.py             # Provider configuration (domains, icons, colors)
│   ├── download_manager.py      # Manages download queue, progress, parallel downloads
│   ├── favorites.py             # Favorites management system (JSON-based)
│   ├── recommendation_engine.py # Analyzes download history for recommendations
│   ├── recommendations.py       # Fetches latest releases from anime sources
│   └── kitsu_api.py             # Kitsu API integration for metadata
├── downloads/                   # Downloaded files storage
├── templates/
│   ├── index.html               # Main web interface
│   ├── player.html              # Video player page
│   └── base.html                # Base template
├── static/                      # Static assets (CSS, JS, images)
└── tests/                       # Test suite with fixtures
```

**Core Components:**

### 1. DownloadManager (`app/download_manager.py`)
- Manages all download tasks with parallel download limit (default: 3 concurrent)
- Handles pause/resume/cancel operations
- Tracks progress, speed, and file chunks for resume support
- Uses `asyncio.Semaphore` to limit concurrent downloads
- Auto-restores completed downloads from disk on server startup

### 2. Downloaders (`app/downloaders/`)

**Factory Pattern:**
- `get_downloader(url)` in `__init__.py` selects appropriate downloader
- Each downloader inherits from `BaseDownloader` abstract class
- Order matters: anime providers checked first, then file hosts
- Falls back to `GenericDownloader` if no match

**BaseDownloader Interface:**
- `can_handle(url)` - Check if downloader supports the URL
- `get_download_link(url)` - Extract direct download link and filename
- `search_anime(query, lang)` - Search anime (anime providers only)
- `get_episodes(anime_url, lang)` - Get episode list (anime providers only)
- `get_anime_metadata(anime_url)` - Get metadata dict (anime providers only) - Note: not in base.py, implemented by anime providers

**Key Patterns:**
- All downloaders use httpx.AsyncClient for HTTP requests
- BeautifulSoup with lxml for HTML parsing
- Async/await throughout for non-blocking I/O
- Fuzzy search using jieba for Chinese text segmentation and typo tolerance

### 3. Provider Configuration (`app/providers.py`)
- `ANIME_PROVIDERS` - Anime streaming sites configuration
- `FILE_HOSTS` - File hosting services configuration
- Each provider has: name, domains, icon, color, url_pattern
- `detect_provider_from_url(url)` - Identify provider from URL

### 4. API Endpoints

**Download Management:**
- `POST /api/download` - Create new download task
- `GET /api/downloads` - List all download tasks
- `GET /api/download/{task_id}` - Get task details
- `POST /api/download/{task_id}/pause` - Pause download
- `POST /api/download/{task_id}/resume` - Resume download
- `DELETE /api/download/{task_id}` - Delete task (keeps completed files)
- `GET /api/download/{task_id}/file` - Download completed file

**Anime Features:**
- `GET /api/anime/search` - Unified search across all providers
- `GET /api/anime/metadata` - Get anime metadata
- `GET /api/anime/episodes` - Get episode list
- `POST /api/anime/download` - Download single episode
- `POST /api/anime/download-season` - Download entire season

**Video Streaming:**
- `GET /video/{task_id}` - Stream video with Range support
- `GET /stream/{filename}` - Stream by filename
- `GET /player/{task_id}` - Video player page
- `GET /watch/{filename}` - Player by filename

**Recommendations & Favorites:**
- `GET /api/recommendations` - Personalized recommendations
- `GET /api/releases/latest` - Latest anime releases
- `GET /api/favorites` - List favorites
- `POST /api/favorites` - Add favorite
- `DELETE /api/favorites/{anime_id}` - Remove favorite

### 5. Web Interface
- Single-page app at `/web` (templates/index.html)
- Auto-refreshes every second to show progress
- Video player with seeking support (HTTP Range headers)
- Dark theme with gradients and animations

## Test Structure

**Test Organization (tests/):**
- `conftest.py` - Pytest configuration and fixtures
- `test_models.py` - Pydantic model tests
- `test_downloaders.py` - Downloader tests
- `test_download_manager.py` - DownloadManager tests
- `test_favorites.py` - Favorites system tests
- `test_api.py` - FastAPI endpoint tests

**Fixtures in conftest.py:**
- `temp_dir` - Temporary directory
- `temp_download_dir` - Temporary download directory
- `download_manager` - DownloadManager instance
- `favorites_manager` - FavoritesManager instance
- `mock_httpx_client` - Mock for httpx.AsyncClient
- `sample_download_task` - Sample task data
- `sample_anime_metadata` - Sample metadata

**Test Markers:**
- `unit` - Unit tests (isolated, fast) - auto-applied
- `integration` - Integration tests (API endpoints) - auto-applied
- `asyncio` - Async tests - auto-applied
- `slow` - Slow tests - manual
- `network` - Requires network - manual

## Adding New Host Support

To add support for a new file hosting service:

1. Create new file in `app/downloaders/` (e.g., `myhost.py`)
2. Inherit from `BaseDownloader`
3. Implement required methods
4. Add to imports in `app/downloaders/__init__.py`
5. Add to `downloaders` list in `get_downloader()`
6. Add configuration to `FILE_HOSTS` in `app/providers.py`

Example:
```python
from .base import BaseDownloader
from bs4 import BeautifulSoup

class MyHostDownloader(BaseDownloader):
    def can_handle(self, url: str) -> bool:
        return "myhost.com" in url.lower()

    async def get_download_link(self, url: str) -> tuple[str, str]:
        soup = BeautifulSoup(await self._fetch_page(url), 'lxml')
        # ... extraction logic ...
        return download_url, filename

    def close(self):
        # IMPORTANT: Always close the HTTP client
        await self.client.aclose()
```

**Important:** Always close the HTTP client in your downloader to avoid resource leaks.

## Adding New Anime Provider

To add a new anime streaming provider:

1. Create downloader inheriting from `BaseDownloader`
2. Implement anime-specific methods:
   - `search_anime(query, lang)` - Return list of anime with title, url, cover_image
   - `get_episodes(anime_url, lang)` - Return list of episodes
   - `get_anime_metadata(anime_url)` - Return metadata dict
3. Add to `ANIME_PROVIDERS` in `app/providers.py`
4. Add to factory in `app/downloaders/__init__.py`
5. Update `main.py` to include in unified search

Metadata should include:
- synopsis, genres, rating, release_year, studio, poster_image, total_episodes, status

## Configuration

Edit `main.py` to configure:
- `max_parallel` - Maximum concurrent downloads (default: 3)
- `download_dir` - Storage location (default: "downloads")

## Key Implementation Details

**Resume Support:**
- Downloads use HTTP Range headers to resume from last byte
- Files downloaded in 1MB chunks
- Partial files cleaned up on cancel
- Resume position tracked in `downloaded_bytes` field

**Domain Handling:**
- Anime providers use dynamic domain detection (e.g., Anime-Sama fetches current domain from anime-sama.pw)
- Multiple domains per provider supported in configuration
- Domain detection via `detect_provider_from_url(url)` in providers.py

**Task Lifecycle:**
- PENDING → DOWNLOADING → PAUSED / COMPLETED / CANCELLED / FAILED
- Active downloads tracked in `active_downloads` dict
- All tasks stored in `tasks` dict with UUID keys
- Completed files preserved when deleting tasks (only partial files removed)

**Video Streaming:**
- Range header support for seeking in video player
- Serves from `/downloads` directory via StaticFiles
- Video extensions: .mp4, .mkv, .avi, .mov, .wmv, .flv, .webm

**Error Handling:**
- Graceful degradation with status tracking
- Network errors caught and reported in task status
- Automatic retry on resume
- Downloads > 1MB considered complete to skip small error files

## Dependencies

**Core:**
- fastapi - Web framework
- uvicorn - ASGI server
- httpx - Async HTTP client
- beautifulsoup4, lxml - HTML parsing
- aiofiles - Async file operations
- jieba - Chinese text segmentation for fuzzy search

**Testing:**
- pytest - Test framework
- pytest-asyncio - Async test support
- pytest-cov - Coverage reporting
- pytest-mock - Mocking support