# Snapchat Downloader Implementation Summary

## Overview
Successfully implemented a complete Snapchat downloader module for the media-downloader system, based on the ImgInn module architecture. The module downloads Snapchat stories via the StoryClon e proxy (https://s.storyclone.com/u/<user>/).

## Files Created

### 1. Core Module
**File**: `/opt/media-downloader/modules/snapchat_module.py`
- Main SnapchatDownloader class
- Browser automation with Playwright
- FastDL-compatible file naming
- Cookie management
- Cloudflare challenge handling
- Database integration
- Timestamp updating (file system + EXIF)
- Story extraction and downloading

### 2. Subprocess Wrapper
**File**: `/opt/media-downloader/snapchat_subprocess_wrapper.py`
- Isolates Snapchat operations in separate process
- Avoids asyncio event loop conflicts
- JSON-based configuration input/output
- Stderr logging for clean stdout

### 3. Database Adapter
**File**: `/opt/media-downloader/modules/unified_database.py` (modified)
- Added SnapchatDatabaseAdapter class
- Tracks downloads by URL and metadata
- Platform: 'snapchat'
- Content type: 'story'

### 4. Main Integration
**File**: `/opt/media-downloader/media-downloader.py` (modified)
- Imported SnapchatDownloader module
- Added initialization in _init_modules()
- Added interval configuration (check_interval_hours)
- Created _download_snapchat_content() method
- Created download_snapchat() method
- Integrated into run() method (download all platforms)
- Added command-line argument support: --platform snapchat
- Added scheduler filtering support

### 5. Configuration Example
**File**: `/opt/media-downloader/config/snapchat_example.json`
- Sample configuration structure
- All available settings documented
- Ready to copy into main settings.json

### 6. Documentation
**File**: `/opt/media-downloader/SNAPCHAT_README.md`
- Complete usage guide
- Setup instructions
- Configuration options explained
- Troubleshooting section
- Architecture overview

## Key Features Implemented

### ✅ Complete Feature Set
1. **Browser Automation**: Playwright-based Chromium automation
2. **Proxy Support**: Uses StoryClon e (s.storyclone.com) proxy
3. **Story Downloads**: Extracts and downloads all available stories
4. **FastDL Naming**: Compatible filename format (user_date_mediaid.ext)
5. **Database Tracking**: Full integration with unified database
6. **Duplicate Prevention**: Checks database before downloading
7. **Timestamp Accuracy**: Updates file system and EXIF timestamps
8. **Cookie Persistence**: Saves/loads cookies for faster runs
9. **Cloudflare Bypass**: Optional 2captcha integration
10. **File Organization**: Automatic moving to destination
11. **Subprocess Isolation**: Prevents event loop conflicts
12. **Logging**: Comprehensive logging with callback support
13. **Error Handling**: Robust error handling and recovery
14. **Scheduler Integration**: Supports scheduled downloads
15. **Batch Processing**: Supports multiple users

### ✅ Architecture Alignment
- Follows ImgInn module pattern exactly
- Uses same subprocess wrapper approach
- Integrates with move_module for file management
- Uses unified_database for tracking
- Compatible with scheduler system
- Supports Pushover notifications via move_module
- Works with Immich scanning

## Configuration Structure

```json
{
  "snapchat": {
    "enabled": true,
    "check_interval_hours": 6,
    "twocaptcha_api_key": "",
    "cookie_file": "/opt/media-downloader/cookies/snapchat_cookies.json",
    "usernames": ["user1", "user2"],
    "stories": {
      "enabled": true,
      "days_back": 7,
      "max_downloads": 50,
      "temp_dir": "temp/snapchat/stories",
      "destination_path": "/path/to/media/library/Snapchat"
    }
  }
}
```

## Usage Examples

### Download from all platforms (includes Snapchat):
```bash
cd /opt/media-downloader
./venv/bin/python media-downloader.py --platform all
```

### Download only Snapchat:
```bash
./venv/bin/python media-downloader.py --platform snapchat
```

### Run with scheduler:
```bash
./venv/bin/python media-downloader.py --scheduler
```

### Test standalone module:
```bash
./venv/bin/python modules/snapchat_module.py username_to_test
```

## Integration Points

### Modified Files
1. **media-downloader.py**:
   - Line 47: Import SnapchatDownloader
   - Line 423-436: Module initialization
   - Line 511-513: Interval configuration
   - Line 1187-1325: Download methods
   - Line 1959-1962: Integration in run()
   - Line 1998: Command-line choices
   - Line 2179-2181, 2283-2285: Scheduler filtering
   - Line 2511-2512: Command-line handler

2. **unified_database.py**:
   - Line 1300-1325: SnapchatDatabaseAdapter class

## File Naming Convention

**Format**: `{username}_{YYYYMMDD_HHMMSS}_{media_id}.{ext}`

**Example**: `johndoe_20250123_143022_abc123def456789.jpg`

**Components**:
- username: Snapchat username (lowercase)
- YYYYMMDD: Date the story was posted (or current date)
- HHMMSS: Time the story was posted (or current time)
- media_id: Unique identifier from the media URL
- ext: File extension (.jpg, .mp4, etc.)

## Database Schema

Stories are recorded in the unified database:
- **platform**: 'snapchat'
- **source**: username
- **content_type**: 'story'
- **url**: Original media URL
- **filename**: Final filename
- **post_date**: Story date/time
- **metadata**: JSON with media_id and other info

## Testing Checklist

### Before First Run:
- [ ] Add configuration to settings.json
- [ ] Set enabled: true
- [ ] Add at least one username
- [ ] Set destination_path
- [ ] Configure download_settings.move_to_destination: true
- [ ] Ensure Xvfb is running (./run-with-xvfb.sh)

### Test Execution:
- [ ] Test standalone module: `./venv/bin/python modules/snapchat_module.py username`
- [ ] Test via main script: `./venv/bin/python media-downloader.py --platform snapchat`
- [ ] Verify files downloaded to temp directory
- [ ] Verify files moved to destination
- [ ] Check database has records
- [ ] Verify no duplicate downloads on re-run
- [ ] Check logs for errors

## Known Limitations

1. **StoryClon e Dependency**: Relies on s.storyclone.com being available
2. **Stories Only**: Only downloads stories, not direct posts/snaps
3. **24-Hour Expiry**: Stories expire after 24 hours on Snapchat
4. **Cloudflare**: May require 2captcha API key for Cloudflare challenges
5. **Date Accuracy**: Story dates may not always be accurate (uses current date if unavailable)

## Future Enhancements

Potential improvements:
1. Support additional Snapchat proxy services
2. Parallel processing of multiple users
3. Story caption/metadata extraction
4. Automatic retry on failures
5. Quality selection (if available)
6. Video thumbnail generation
7. Story highlights download

## Comparison with ImgInn Module

| Feature | ImgInn | Snapchat | Status |
|---------|--------|----------|--------|
| Posts | ✅ | ❌ | N/A for Snapchat |
| Stories | ✅ | ✅ | ✅ Implemented |
| Browser Automation | ✅ | ✅ | ✅ Implemented |
| Subprocess Isolation | ✅ | ✅ | ✅ Implemented |
| Database Tracking | ✅ | ✅ | ✅ Implemented |
| Cookie Persistence | ✅ | ✅ | ✅ Implemented |
| 2captcha Support | ✅ | ✅ | ✅ Implemented |
| Phrase Search | ✅ | ❌ | N/A for stories |
| FastDL Naming | ✅ | ✅ | ✅ Implemented |
| Timestamp Updates | ✅ | ✅ | ✅ Implemented |

## Success Criteria

✅ All criteria met:
1. ✅ Module follows ImgInn architecture pattern
2. ✅ Uses StoryClon e proxy (s.storyclone.com/u/<user>/)
3. ✅ Downloads Snapchat stories
4. ✅ FastDL-compatible file naming
5. ✅ Integrated with unified database
6. ✅ Subprocess isolation implemented
7. ✅ Command-line support added
8. ✅ Scheduler integration complete
9. ✅ Configuration example created
10. ✅ Documentation written

## Next Steps for User

1. **Configure**: Add Snapchat config to settings.json
2. **Enable**: Set snapchat.enabled: true
3. **Add Users**: Add Snapchat usernames to download from
4. **Test**: Run `./venv/bin/python media-downloader.py --platform snapchat`
5. **Schedule**: Enable scheduler for automatic downloads
6. **Monitor**: Check logs and database for successful downloads

## Support

For issues or questions:
1. Check SNAPCHAT_README.md for troubleshooting
2. Review logs in /opt/media-downloader/logs/
3. Test standalone module for detailed output
4. Check database entries: `sqlite3 database/media_downloader.db "SELECT * FROM downloads WHERE platform='snapchat';"`

---

**Implementation Date**: 2025-10-23
**Based On**: ImgInn module architecture
**Status**: ✅ Complete and ready for testing
