# Library Scanner Overview

The Bookhoard scanner provides comprehensive library management for ebooks, comics, and manga with both manual and automated scanning capabilities.

## Scanner Types

### Manual Scanning
- **One-time scan**: On-demand scanning of library folders
- **Progress tracking**: Real-time status updates with file-by-file progress
- **Error reporting**: Detailed logs of failed files with error messages

### Automated Scanner
- **Periodic scanning**: Configurable interval-based background scanning
- **Automatic discovery**: Detects new files without manual intervention
- **Resource-efficient**: Minimizes system impact with smart scheduling

### Watch Mode
- **Real-time monitoring**: Instant detection of file system changes
- **Event-driven**: Processes files immediately upon addition/modification
- **Platform support**: Works with inotify (Linux), FSEvents (macOS), and ReadDirectoryChangesW (Windows)

## Supported Formats

### Ebooks
| Format | Extensions |
|--------|------------|
| EPUB | `.epub` |
| PDF | `.pdf` |
| Kindle | `.mobi`, `.azw`, `.azw3` |
| Text | `.txt`, `.rtf` |
| Document | `.doc`, `.docx` |
| Other | `.lit`, `.fb2`, `.pdb` |

### Comics
| Format | Extensions | Archive Type |
|--------|------------|--------------|
| Comic Book ZIP | `.cbz` | ZIP |
| Comic Book RAR | `.cbr` | RAR |
| Comic Book 7z | `.cb7` | 7-Zip |
| Comic Book TAR | `.cbt` | TAR |
| PDF Comics | `.pdf` | PDF |

### Manga
| Format | Extensions | Notes |
|--------|------------|-------|
| Comic Archives | `.cbz`, `.cbr` | Same as comics |
| Image Files | `.png`, `.jpg`, `.jpeg`, `.gif`, `.bmp`, `.webp` | Individual pages |

## Metadata Extraction

### Comic Archives (.cbz, .cbr, .cb7, .cbt)
The scanner automatically extracts metadata from comic archives:

**ComicInfo.xml Support:**
- Series title
- Issue number
- Publisher
- Writer, artist, inker, colorist
- Year, month
- Genre, tags
- Cover image extraction

**Fallback Metadata:**
- Filename parsing
- Archive structure analysis
- Page count detection

### Manga Processing
- **Archive-based**: Processes .cbz/.cbr files like comics
- **Image-based**: Handles directories of sequential images
- **Chapter detection**: Identifies chapter/volume numbers from filenames
- **Series grouping**: Groups images into logical manga volumes

## Scanner Features

### Smart Deduplication
- SHA256 hash calculation for all files
- Automatic duplicate detection and skipping
- Efficient incremental updates

### Library Type Awareness
- Format filtering based on library type
- Type-specific metadata extraction
- Appropriate thumbnail generation

### Error Handling
- Continues on individual file errors
- Detailed error reporting in scan status
- Failed file tracking for retry

### Progress Tracking
- Total files vs. processed files
- Percentage completion
- Added, updated, and failed file counts
- Per-file error messages

## Performance Considerations

### Large Libraries
- **Scanning speed**: Processes hundreds of files per second
- **Memory usage**: Streaming metadata extraction
- **Database efficiency**: Batch inserts and updates

### Resource Limits
- **Configurable intervals**: Prevent excessive scanning
- **Rate limiting**: Watch mode debounce settings
- **Admin controls**: Start/stop operations as needed

## Usage Examples

### Create and Scan a Comic Library
```json
POST /api/libraries
{
  "name": "My Comic Collection",
  "library_type_id": "comics-type-uuid",
  "description": "Marvel and DC comics"
}

POST /api/scanner/scan
{
  "library_id": "library-uuid",
  "recursive": true
}
```

### Enable Watch Mode for Manga
```json
POST /api/scanner/watch/start
{
  "library_id": "manga-library-uuid"
}
```

### Check Scan Progress
```http
GET /api/scanner/status/550e8400-e29b-41d4-a716-446655440000
```

## Related Endpoints

- [Scan Library](scan_library.md) - Manual one-time scan
- [Start Scanner](start_scanner.md) - Automated periodic scanning
- [Stop Scanner](stop_scanner.md) - Stop automated scanner
- [Get Scan Status](get_scan_status.md) - Check scan progress
- [Start Watch Mode](start_watch_mode.md) - Enable real-time monitoring
- [Stop Watch Mode](stop_watch_mode.md) - Disable watch mode
- [Get Watch Mode Status](get_watch_mode_status.md) - Check watch status
