# Create Collection

Create a new collection.

**Endpoint**: `POST /api/collections`
**Auth**: Required
**Content-Type**: `application/json`

## Request Body

| Field | Type | Required | Description |
|--------|------|-----------|-------------|
| name | string | Yes | Collection name (max 255 chars) |
| description | string | No | Collection description |
| color | string | No | Hex color code (e.g., "#FF5733") |
| icon | string | No | Emoji icon (e.g., "🚀", "📖") |
| auto_assign_rules | array | No | Array of rule objects |
| view_settings | object | No | Per-device display preferences |

### Auto-Assign Rule Object

| Field | Type | Required | Description |
|--------|------|-----------|-------------|
| field | string | Yes | Field to match on (genre, author, series, language, publisher, copyright_year, tags) |
| operator | string | Yes | Comparison operator (equals, not_equals, contains, not_contains, starts_with, ends_with, greater_than, less_than) |
| value | string/number | Yes | Value to compare against |
| priority | integer | No | Rule priority (1 = highest, default: 1) |
| enabled | boolean | No | Whether rule is active (default: true) |

### Example Request

```json
{
  "name": "To Read",
  "description": "Books I want to read soon",
  "color": "#00FF00",
  "icon": "📖",
  "auto_assign_rules": [
    {
      "field": "tags",
      "operator": "contains",
      "value": "to-read",
      "priority": 1,
      "enabled": true
    }
  ],
  "view_settings": {
    "kobo": {
      "view_mode": "grid"
    },
    "koreader": {
      "view_mode": "list"
    }
  }
}
```

## Response (201 Created)

```json
{
  "id": "550e8400-e29b-41d4-a716-446655440000",
  "name": "To Read",
  "description": "Books I want to read soon",
  "color": "#00FF00",
  "icon": "📖",
  "auto_assign_rules": [
    {
      "field": "tags",
      "operator": "contains",
      "value": "to-read",
      "priority": 1,
      "enabled": true
    }
  ],
  "view_settings": {
    "kobo": {
      "view_mode": "grid"
    },
    "koreader": {
      "view_mode": "list"
    }
  },
  "created_at": "2026-02-01T10:00:00Z"
}
```

## Error Responses

| Code | Description |
|------|-------------|
| 400 | Invalid request (validation failed) |
| 401 | Authentication required |
| 500 | Internal server error |

## Try It Out
