# Create Highlight

Create a new highlight for a media item.

**Endpoint**: `POST /api/media-items/{media_id}/highlights`
**Auth**: Required
**Content-Type**: `application/json`

## Path Parameters

| Parameter | Type | Required | Description |
|-----------|------|-----------|-------------|
| media_id | string | Yes | Media item UUID |

## Request Body

| Field | Type | Required | Description |
|--------|------|-----------|-------------|
| selection_text | string | Yes | Highlighted text |
| start_position | string | No | Start position (e.g., epubcfi) |
| end_position | string | No | End position (e.g., epubcfi) |
| color | string | No | Highlight color (hex, default: "#ffff00") |
| percentage_start | float | No | Start percentage (0-1) |
| percentage_end | float | No | End percentage (0-1) |

### Example Request

```json
{
  "selection_text": "Highlighted text...",
  "start_position": "epubcfi(/6/4/2:15)",
  "end_position": "epubcfi(/6/4/2:20)",
  "color": "#ffff00",
  "percentage_start": 0.45,
  "percentage_end": 0.47
}
```

## Response (201 Created)

```json
{
  "id": "uuid",
  "media_item_id": "uuid",
  "user_id": "uuid",
  "selection_text": "Highlighted text...",
  "start_position": "epubcfi(/6/4/2:15)",
  "end_position": "epubcfi(/6/4/2:20)",
  "color": "#ffff00",
  "percentage_start": 0.45,
  "percentage_end": 0.47,
  "created_at": "2026-01-31T10:00:00Z"
}
```

## Error Responses

| Code | Description |
|------|-------------|
| 400 | Invalid highlight data |
| 401 | Invalid or expired token |
| 404 | Media item not found |