# API Reference

Comprehensive API documentation for Sonic Cloud platform endpoints.

---

## Authentication Endpoints

API endpoints for user registration, login, and password recovery.

### POST /api/auth/register
**Description**: Register a new user account on the platform.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Request Body**:
```json
{
  "email": "user@example.com",
  "password": "securePassword123",
  "username": "username",
  "displayName": "Display Name" // Optional
}
```

**Response** (201 Created):
```json
{
  "user": {
    "id": "uuid",
    "email": "user@example.com",
    "username": "username",
    "displayName": "Display Name",
    "role": "USER"
  },
  "token": "jwt_token_string"
}
```

**Error Responses**:
- 400 Bad Request: Missing required fields or invalid email format
- 409 Conflict: Email or username already exists

**Implementation**: `app/api/auth/register/route.ts`

</details>

---

### POST /api/auth/login
**Description**: Authenticate user credentials and receive a session token.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Request Body**:
```json
{
  "email": "user@example.com",
  "password": "securePassword123"
}
```

**Response** (200 OK):
```json
{
  "user": {
    "id": "uuid",
    "email": "user@example.com",
    "username": "username",
    "displayName": "Display Name",
    "role": "USER"
  },
  "token": "jwt_token_string"
}
```

**Error Responses**:
- 400 Bad Request: Missing email or password
- 401 Unauthorized: Invalid credentials

**Implementation**: `app/api/auth/login/route.ts`

</details>

---

### POST /api/auth/forgot-password
**Description**: Initiate password reset process by sending reset token via email.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Request Body**:
```json
{
  "email": "user@example.com"
}
```

**Response** (200 OK):
```json
{
  "message": "Password reset email sent"
}
```

**Error Responses**:
- 400 Bad Request: Missing email
- 404 Not Found: User with email not found

**Implementation**: `app/api/auth/forgot-password/route.ts`

**Note**: Reset token is generated and stored with expiration timestamp. Token is sent via email (email service integration required).

</details>

---

### POST /api/auth/reset-password
**Description**: Reset user password using a valid reset token from email.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Request Body**:
```json
{
  "token": "reset_token_from_email",
  "newPassword": "newSecurePassword123"
}
```

**Response** (200 OK):
```json
{
  "message": "Password reset successful"
}
```

**Error Responses**:
- 400 Bad Request: Missing token or newPassword
- 401 Unauthorized: Invalid or expired token
- 404 Not Found: User not found

**Implementation**: `app/api/auth/reset-password/route.ts`

</details>

---

## User Endpoints

API endpoints for managing user profile information.

### GET /api/users/me
**Description**: Retrieve the current authenticated user's profile information.

**Authentication**: Required (JWT token)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "email": "user@example.com",
  "username": "username",
  "displayName": "Display Name",
  "bio": "User biography text",
  "avatarUrl": "https://example.com/avatar.jpg",
  "websiteUrl": "https://example.com",
  "role": "USER",
  "createdAt": "2025-01-01T00:00:00.000Z",
  "artist": {
    "id": "uuid",
    "name": "Artist Name"
  } // If user is an artist
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 404 Not Found: User not found

**Implementation**: `app/api/users/me/route.ts`

</details>

---

### PUT /api/users/me
**Description**: Update the current authenticated user's profile information.

**Authentication**: Required (JWT token)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Request Body** (all fields optional):
```json
{
  "displayName": "New Display Name",
  "bio": "Updated biography",
  "avatarUrl": "https://example.com/new-avatar.jpg",
  "websiteUrl": "https://example.com"
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "email": "user@example.com",
  "username": "username",
  "displayName": "New Display Name",
  "bio": "Updated biography",
  "avatarUrl": "https://example.com/new-avatar.jpg",
  "websiteUrl": "https://example.com",
  "role": "USER"
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 404 Not Found: User not found

**Implementation**: `app/api/users/me/route.ts`

</details>

---

## Artist Endpoints

API endpoints for managing artist profiles, songs, and albums.

### POST /api/artists
**Description**: Create a new artist profile for the authenticated user.

**Authentication**: Required (JWT token)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Request Body**:
```json
{
  "name": "Artist Name",
  "bio": "Artist biography",
  "avatarUrl": "https://example.com/avatar.jpg",
  "bannerUrl": "https://example.com/banner.jpg",
  "websiteUrl": "https://example.com",
  "spotifyUrl": "https://open.spotify.com/artist/...",
  "instagramUrl": "https://instagram.com/artist"
}
```

**Response** (201 Created):
```json
{
  "id": "uuid",
  "userId": "uuid",
  "name": "Artist Name",
  "slug": "artist-name",
  "bio": "Artist biography",
  "verified": false,
  "createdAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 400 Bad Request: Missing required fields or user already has artist profile
- 401 Unauthorized: Missing or invalid token

**Implementation**: `app/api/artists/route.ts`

**Note**: Slug is auto-generated from artist name for URL-friendly identifiers.

</details>

---

### GET /api/artists/{id}
**Description**: Retrieve detailed information about a specific artist including statistics and relationships.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Artist UUID

**Response** (200 OK):
```json
{
  "id": "uuid",
  "name": "Artist Name",
  "slug": "artist-name",
  "bio": "Artist biography",
  "avatarUrl": "https://example.com/avatar.jpg",
  "bannerUrl": "https://example.com/banner.jpg",
  "verified": true,
  "websiteUrl": "https://example.com",
  "spotifyUrl": "https://open.spotify.com/artist/...",
  "instagramUrl": "https://instagram.com/artist",
  "createdAt": "2025-01-01T00:00:00.000Z",
  "_count": {
    "songs": 42,
    "albums": 5
  },
  "label": {
    "id": "uuid",
    "name": "Label Name"
  } // If artist is signed to label
}
```

**Error Responses**:
- 404 Not Found: Artist not found

**Implementation**: `app/api/artists/[id]/route.ts`

</details>

---

### PUT /api/artists/{id}
**Description**: Update artist profile information. Only the artist owner can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Artist UUID

**Request Body** (all fields optional):
```json
{
  "name": "Updated Artist Name",
  "bio": "Updated biography",
  "avatarUrl": "https://example.com/new-avatar.jpg",
  "bannerUrl": "https://example.com/new-banner.jpg",
  "websiteUrl": "https://example.com",
  "spotifyUrl": "https://open.spotify.com/artist/...",
  "instagramUrl": "https://instagram.com/artist"
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "name": "Updated Artist Name",
  "slug": "updated-artist-name",
  "bio": "Updated biography",
  "verified": true
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the artist owner
- 404 Not Found: Artist not found

**Implementation**: `app/api/artists/[id]/route.ts`

</details>

---

### GET /api/artists/{id}/songs
**Description**: Retrieve all public songs by a specific artist.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Artist UUID

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "title": "Song Title",
    "duration": 240,
    "audioUrl": "https://example.com/audio.mp3",
    "coverUrl": "https://example.com/cover.jpg",
    "playCount": 1234,
    "isPublic": true,
    "createdAt": "2025-01-01T00:00:00.000Z",
    "album": {
      "id": "uuid",
      "title": "Album Title"
    },
    "genres": [
      { "name": "Rock", "slug": "rock" }
    ]
  }
]
```

**Error Responses**:
- 404 Not Found: Artist not found

**Implementation**: `app/api/artists/[id]/songs/route.ts`

**Note**: Only returns songs where `isPublic = true`.

</details>

---

### GET /api/artists/{id}/albums
**Description**: Retrieve all albums by a specific artist, sorted by release date (newest first).

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Artist UUID

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "title": "Album Title",
    "coverUrl": "https://example.com/cover.jpg",
    "releaseDate": "2025-01-01T00:00:00.000Z",
    "albumType": "ALBUM", // or "EP", "SINGLE"
    "_count": {
      "songs": 12
    }
  }
]
```

**Error Responses**:
- 404 Not Found: Artist not found

**Implementation**: `app/api/artists/[id]/albums/route.ts`

</details>

---

## Song Endpoints

API endpoints for uploading, managing, and tracking song playback.

### POST /api/songs/upload
**Description**: Upload a new song to the platform. Only users with artist profiles can upload songs.

**Authentication**: Required (JWT token, artist only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Request Body**:
```json
{
  "title": "Song Title",
  "audioUrl": "https://example.com/audio.mp3",
  "coverUrl": "https://example.com/cover.jpg",
  "duration": 240, // in seconds
  "albumId": "uuid", // Optional
  "isPublic": true,
  "genres": ["rock", "indie"] // Array of genre slugs
}
```

**Response** (201 Created):
```json
{
  "id": "uuid",
  "artistId": "uuid",
  "title": "Song Title",
  "audioUrl": "https://example.com/audio.mp3",
  "coverUrl": "https://example.com/cover.jpg",
  "duration": 240,
  "playCount": 0,
  "isPublic": true,
  "createdAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 400 Bad Request: Missing required fields
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not an artist

**Implementation**: `app/api/songs/upload/route.ts`

</details>

---

### GET /api/songs/{id}
**Description**: Retrieve detailed information about a specific song. Public songs are always accessible, private songs only accessible to owner.

**Authentication**: Optional (required for private songs)

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Song UUID

**Request Headers** (optional for public songs):
```
Authorization: Bearer jwt_token_string
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "title": "Song Title",
  "audioUrl": "https://example.com/audio.mp3",
  "coverUrl": "https://example.com/cover.jpg",
  "duration": 240,
  "playCount": 1234,
  "isPublic": true,
  "createdAt": "2025-01-01T00:00:00.000Z",
  "artist": {
    "id": "uuid",
    "name": "Artist Name",
    "slug": "artist-name",
    "verified": true
  },
  "album": {
    "id": "uuid",
    "title": "Album Title",
    "coverUrl": "https://example.com/album-cover.jpg"
  },
  "genres": [
    {
      "id": "uuid",
      "name": "Rock",
      "slug": "rock",
      "color": "#FF0000"
    }
  ]
}
```

**Error Responses**:
- 403 Forbidden: Song is private and user is not owner
- 404 Not Found: Song not found

**Implementation**: `app/api/songs/[id]/route.ts`

</details>

---

### PUT /api/songs/{id}
**Description**: Update song information. Only the song owner (artist) can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Song UUID

**Request Body** (all fields optional):
```json
{
  "title": "Updated Song Title",
  "coverUrl": "https://example.com/new-cover.jpg",
  "isPublic": false,
  "albumId": "uuid",
  "genres": ["rock", "pop"]
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "title": "Updated Song Title",
  "coverUrl": "https://example.com/new-cover.jpg",
  "isPublic": false,
  "updatedAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the song owner
- 404 Not Found: Song not found

**Implementation**: `app/api/songs/[id]/route.ts`

</details>

---

### DELETE /api/songs/{id}
**Description**: Delete a song from the platform. Only the song owner (artist) can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Song UUID

**Response** (204 No Content)

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the song owner
- 404 Not Found: Song not found

**Implementation**: `app/api/songs/[id]/route.ts`

**Note**: Deleting a song also removes it from all playlists and deletes associated share links.

</details>

---

### POST /api/songs/{id}/play
**Description**: Increment the play count for a song. Used for tracking song popularity.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Song UUID

**Response** (200 OK):
```json
{
  "playCount": 1235
}
```

**Error Responses**:
- 404 Not Found: Song not found

**Implementation**: `app/api/songs/[id]/play/route.ts`

**Note**: This endpoint is called each time a song starts playing. It's rate-limited per user to prevent abuse.

</details>

---

## Album Endpoints

API endpoints for creating and managing music albums.

### POST /api/albums
**Description**: Create a new album. Only users with artist profiles can create albums.

**Authentication**: Required (JWT token, artist only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Request Body**:
```json
{
  "title": "Album Title",
  "coverUrl": "https://example.com/cover.jpg",
  "releaseDate": "2025-01-01",
  "albumType": "ALBUM", // or "EP", "SINGLE"
  "description": "Album description text"
}
```

**Response** (201 Created):
```json
{
  "id": "uuid",
  "artistId": "uuid",
  "title": "Album Title",
  "coverUrl": "https://example.com/cover.jpg",
  "releaseDate": "2025-01-01T00:00:00.000Z",
  "albumType": "ALBUM",
  "description": "Album description text",
  "createdAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 400 Bad Request: Missing required fields
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not an artist

**Implementation**: `app/api/albums/route.ts`

</details>

---

### GET /api/albums/{id}
**Description**: Retrieve album details including all songs in the album.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Album UUID

**Response** (200 OK):
```json
{
  "id": "uuid",
  "title": "Album Title",
  "coverUrl": "https://example.com/cover.jpg",
  "releaseDate": "2025-01-01T00:00:00.000Z",
  "albumType": "ALBUM",
  "description": "Album description text",
  "artist": {
    "id": "uuid",
    "name": "Artist Name",
    "slug": "artist-name",
    "verified": true
  },
  "songs": [
    {
      "id": "uuid",
      "title": "Song Title",
      "duration": 240,
      "trackNumber": 1,
      "audioUrl": "https://example.com/audio.mp3",
      "playCount": 1234
    }
  ]
}
```

**Error Responses**:
- 404 Not Found: Album not found

**Implementation**: `app/api/albums/[id]/route.ts`

</details>

---

### PUT /api/albums/{id}
**Description**: Update album information. Only the album owner (artist) can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Album UUID

**Request Body** (all fields optional):
```json
{
  "title": "Updated Album Title",
  "coverUrl": "https://example.com/new-cover.jpg",
  "description": "Updated description",
  "albumType": "EP"
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "title": "Updated Album Title",
  "coverUrl": "https://example.com/new-cover.jpg",
  "description": "Updated description",
  "albumType": "EP",
  "updatedAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the album owner
- 404 Not Found: Album not found

**Implementation**: `app/api/albums/[id]/route.ts`

</details>

---

### DELETE /api/albums/{id}
**Description**: Delete an album from the platform. Only the album owner (artist) can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Album UUID

**Response** (204 No Content)

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the album owner
- 404 Not Found: Album not found

**Implementation**: `app/api/albums/[id]/route.ts`

**Note**: Deleting an album does NOT delete the songs in the album. Songs become album-less but remain on the platform.

</details>

---

## Playlist Endpoints

API endpoints for creating and managing user playlists.

### GET /api/playlists
**Description**: Retrieve all playlists created by the authenticated user.

**Authentication**: Required (JWT token)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "title": "Playlist Title",
    "description": "Playlist description",
    "coverUrl": "https://example.com/cover.jpg",
    "isPublic": true,
    "createdAt": "2025-01-01T00:00:00.000Z",
    "_count": {
      "songs": 24
    }
  }
]
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token

**Implementation**: `app/api/playlists/route.ts`

</details>

---

### POST /api/playlists
**Description**: Create a new playlist for the authenticated user.

**Authentication**: Required (JWT token)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Request Body**:
```json
{
  "title": "Playlist Title",
  "description": "Playlist description",
  "coverUrl": "https://example.com/cover.jpg",
  "isPublic": true
}
```

**Response** (201 Created):
```json
{
  "id": "uuid",
  "userId": "uuid",
  "title": "Playlist Title",
  "description": "Playlist description",
  "coverUrl": "https://example.com/cover.jpg",
  "isPublic": true,
  "createdAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 400 Bad Request: Missing title
- 401 Unauthorized: Missing or invalid token

**Implementation**: `app/api/playlists/route.ts`

</details>

---

### GET /api/playlists/{id}
**Description**: Retrieve playlist details with all songs. Public playlists are accessible to everyone, private playlists only to owner.

**Authentication**: Optional (required for private playlists)

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Playlist UUID

**Request Headers** (optional for public playlists):
```
Authorization: Bearer jwt_token_string
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "title": "Playlist Title",
  "description": "Playlist description",
  "coverUrl": "https://example.com/cover.jpg",
  "isPublic": true,
  "createdAt": "2025-01-01T00:00:00.000Z",
  "user": {
    "id": "uuid",
    "username": "username",
    "displayName": "Display Name"
  },
  "songs": [
    {
      "id": "uuid",
      "song": {
        "id": "uuid",
        "title": "Song Title",
        "duration": 240,
        "audioUrl": "https://example.com/audio.mp3",
        "coverUrl": "https://example.com/cover.jpg",
        "artist": {
          "id": "uuid",
          "name": "Artist Name"
        }
      },
      "position": 1,
      "addedAt": "2025-01-01T00:00:00.000Z"
    }
  ]
}
```

**Error Responses**:
- 403 Forbidden: Playlist is private and user is not owner
- 404 Not Found: Playlist not found

**Implementation**: `app/api/playlists/[id]/route.ts`

</details>

---

### PUT /api/playlists/{id}
**Description**: Update playlist information. Only the playlist owner can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Playlist UUID

**Request Body** (all fields optional):
```json
{
  "title": "Updated Playlist Title",
  "description": "Updated description",
  "coverUrl": "https://example.com/new-cover.jpg",
  "isPublic": false
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "title": "Updated Playlist Title",
  "description": "Updated description",
  "coverUrl": "https://example.com/new-cover.jpg",
  "isPublic": false,
  "updatedAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the playlist owner
- 404 Not Found: Playlist not found

**Implementation**: `app/api/playlists/[id]/route.ts`

</details>

---

### DELETE /api/playlists/{id}
**Description**: Delete a playlist. Only the playlist owner can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Playlist UUID

**Response** (204 No Content)

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the playlist owner
- 404 Not Found: Playlist not found

**Implementation**: `app/api/playlists/[id]/route.ts`

**Note**: Deleting a playlist does NOT delete the songs in it, only the playlist container.

</details>

---

### POST /api/playlists/{id}/songs
**Description**: Add a song to a playlist. Only the playlist owner can add songs.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Playlist UUID

**Request Body**:
```json
{
  "songId": "uuid"
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "playlistId": "uuid",
  "songId": "uuid",
  "position": 5,
  "addedAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 400 Bad Request: Missing songId or song already in playlist
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the playlist owner
- 404 Not Found: Playlist or song not found

**Implementation**: `app/api/playlists/[id]/songs/route.ts`

**Note**: Position is automatically assigned as the last position in the playlist.

</details>

---

### PUT /api/playlists/{id}/reorder
**Description**: Reorder songs within a playlist. Only the playlist owner can reorder songs.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Playlist UUID

**Request Body**:
```json
{
  "songIds": ["uuid1", "uuid2", "uuid3"]
}
```

**Response** (200 OK):
```json
{
  "message": "Playlist reordered successfully"
}
```

**Error Responses**:
- 400 Bad Request: Missing songIds array or songIds don't match playlist
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the playlist owner
- 404 Not Found: Playlist not found

**Implementation**: `app/api/playlists/[id]/reorder/route.ts`

**Note**: All songs in the playlist must be included in the songIds array in the desired order.

</details>

---

## Discovery Endpoints

API endpoints for discovering trending music, new releases, and browsing by genre.

### GET /api/discover/trending
**Description**: Retrieve trending public songs sorted by play count.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Query Parameters**:
- `limit` (number, optional): Number of results to return (default: 20, max: 100)

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "title": "Song Title",
    "duration": 240,
    "audioUrl": "https://example.com/audio.mp3",
    "coverUrl": "https://example.com/cover.jpg",
    "playCount": 5432,
    "artist": {
      "id": "uuid",
      "name": "Artist Name",
      "slug": "artist-name",
      "verified": true
    },
    "genres": [
      { "name": "Rock", "slug": "rock", "color": "#FF0000" }
    ]
  }
]
```

**Implementation**: `app/api/discover/trending/route.ts`

**Note**: Only returns songs where `isPublic = true`, sorted by `playCount` descending.

</details>

---

### GET /api/discover/new-releases
**Description**: Retrieve recently uploaded public songs sorted by creation date.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Query Parameters**:
- `limit` (number, optional): Number of results to return (default: 20, max: 100)

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "title": "Song Title",
    "duration": 240,
    "audioUrl": "https://example.com/audio.mp3",
    "coverUrl": "https://example.com/cover.jpg",
    "createdAt": "2025-01-01T00:00:00.000Z",
    "artist": {
      "id": "uuid",
      "name": "Artist Name",
      "slug": "artist-name",
      "verified": true
    },
    "genres": [
      { "name": "Pop", "slug": "pop", "color": "#00FF00" }
    ]
  }
]
```

**Implementation**: `app/api/discover/new-releases/route.ts`

**Note**: Only returns songs where `isPublic = true`, sorted by `createdAt` descending.

</details>

---

### GET /api/discover/genres
**Description**: Retrieve all available genres with song counts.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "name": "Rock",
    "slug": "rock",
    "description": "Rock music genre",
    "color": "#FF0000",
    "_count": {
      "songs": 142
    }
  },
  {
    "id": "uuid",
    "name": "Pop",
    "slug": "pop",
    "description": "Pop music genre",
    "color": "#00FF00",
    "_count": {
      "songs": 98
    }
  }
]
```

**Implementation**: `app/api/discover/genres/route.ts`

</details>

---

### GET /api/discover/genres/{slug}
**Description**: Retrieve all public songs in a specific genre.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `slug` (string): Genre slug (e.g., "rock", "pop", "jazz")

**Query Parameters**:
- `limit` (number, optional): Number of results to return (default: 50, max: 100)

**Response** (200 OK):
```json
{
  "genre": {
    "id": "uuid",
    "name": "Rock",
    "slug": "rock",
    "description": "Rock music genre",
    "color": "#FF0000"
  },
  "songs": [
    {
      "id": "uuid",
      "title": "Song Title",
      "duration": 240,
      "audioUrl": "https://example.com/audio.mp3",
      "coverUrl": "https://example.com/cover.jpg",
      "playCount": 1234,
      "artist": {
        "id": "uuid",
        "name": "Artist Name",
        "verified": true
      }
    }
  ]
}
```

**Error Responses**:
- 404 Not Found: Genre not found

**Implementation**: `app/api/discover/genres/[slug]/route.ts`

</details>

---

## Label Endpoints

API endpoints for managing record label profiles and artist rosters.

### POST /api/labels
**Description**: Create a new record label profile for the authenticated user.

**Authentication**: Required (JWT token)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**Request Body**:
```json
{
  "name": "Label Name",
  "description": "Label description",
  "logoUrl": "https://example.com/logo.png",
  "websiteUrl": "https://example.com",
  "contactEmail": "contact@label.com"
}
```

**Response** (201 Created):
```json
{
  "id": "uuid",
  "userId": "uuid",
  "name": "Label Name",
  "slug": "label-name",
  "description": "Label description",
  "logoUrl": "https://example.com/logo.png",
  "websiteUrl": "https://example.com",
  "contactEmail": "contact@label.com",
  "createdAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 400 Bad Request: Missing required fields or user already has label profile
- 401 Unauthorized: Missing or invalid token

**Implementation**: `app/api/labels/route.ts`

</details>

---

### GET /api/labels/{id}
**Description**: Retrieve label details with artist roster list.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Label UUID

**Response** (200 OK):
```json
{
  "id": "uuid",
  "name": "Label Name",
  "slug": "label-name",
  "description": "Label description",
  "logoUrl": "https://example.com/logo.png",
  "websiteUrl": "https://example.com",
  "contactEmail": "contact@label.com",
  "createdAt": "2025-01-01T00:00:00.000Z",
  "artists": [
    {
      "id": "uuid",
      "name": "Artist Name",
      "slug": "artist-name",
      "verified": true,
      "avatarUrl": "https://example.com/avatar.jpg"
    }
  ]
}
```

**Error Responses**:
- 404 Not Found: Label not found

**Implementation**: `app/api/labels/[id]/route.ts`

</details>

---

### PUT /api/labels/{id}
**Description**: Update label profile information. Only the label owner can perform this action.

**Authentication**: Required (JWT token, owner only)

<details>
<summary>🔧 Technical Details</summary>

**Request Headers**:
```
Authorization: Bearer jwt_token_string
```

**URL Parameters**:
- `id` (string): Label UUID

**Request Body** (all fields optional):
```json
{
  "name": "Updated Label Name",
  "description": "Updated description",
  "logoUrl": "https://example.com/new-logo.png",
  "websiteUrl": "https://example.com",
  "contactEmail": "newcontact@label.com"
}
```

**Response** (200 OK):
```json
{
  "id": "uuid",
  "name": "Updated Label Name",
  "slug": "updated-label-name",
  "description": "Updated description",
  "logoUrl": "https://example.com/new-logo.png",
  "updatedAt": "2025-01-01T00:00:00.000Z"
}
```

**Error Responses**:
- 401 Unauthorized: Missing or invalid token
- 403 Forbidden: User is not the label owner
- 404 Not Found: Label not found

**Implementation**: `app/api/labels/[id]/route.ts`

</details>

---

### GET /api/labels/{id}/stats
**Description**: Retrieve statistical information about a label including artist count, total songs, albums, and play counts.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Label UUID

**Response** (200 OK):
```json
{
  "artistCount": 15,
  "totalSongs": 342,
  "totalAlbums": 48,
  "totalPlays": 123456
}
```

**Error Responses**:
- 404 Not Found: Label not found

**Implementation**: `app/api/labels/[id]/stats/route.ts`

</details>

---

### GET /api/labels/{id}/artists
**Description**: Retrieve all artists signed to a specific label.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Label UUID

**Response** (200 OK):
```json
[
  {
    "id": "uuid",
    "name": "Artist Name",
    "slug": "artist-name",
    "bio": "Artist biography",
    "avatarUrl": "https://example.com/avatar.jpg",
    "verified": true,
    "_count": {
      "songs": 24,
      "albums": 3
    }
  }
]
```

**Error Responses**:
- 404 Not Found: Label not found

**Implementation**: `app/api/labels/[id]/artists/route.ts`

</details>

---

## Search Endpoint

Full-text search across songs, artists, and albums.

### GET /api/search
**Description**: Search for songs, artists, and albums across the platform using full-text search.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**Query Parameters**:
- `q` (string, required): Search query text
- `type` (string, optional): Filter by type ("song", "artist", "album", or omit for all)
- `limit` (number, optional): Max results per type (default: 10, max: 50)

**Response** (200 OK):
```json
{
  "songs": [
    {
      "id": "uuid",
      "title": "Song Title",
      "duration": 240,
      "audioUrl": "https://example.com/audio.mp3",
      "coverUrl": "https://example.com/cover.jpg",
      "playCount": 1234,
      "artist": {
        "id": "uuid",
        "name": "Artist Name",
        "verified": true
      }
    }
  ],
  "artists": [
    {
      "id": "uuid",
      "name": "Artist Name",
      "slug": "artist-name",
      "bio": "Artist biography",
      "avatarUrl": "https://example.com/avatar.jpg",
      "verified": true,
      "_count": {
        "songs": 24
      }
    }
  ],
  "albums": [
    {
      "id": "uuid",
      "title": "Album Title",
      "coverUrl": "https://example.com/cover.jpg",
      "releaseDate": "2025-01-01T00:00:00.000Z",
      "albumType": "ALBUM",
      "artist": {
        "id": "uuid",
        "name": "Artist Name"
      },
      "_count": {
        "songs": 12
      }
    }
  ]
}
```

**Error Responses**:
- 400 Bad Request: Missing search query parameter

**Implementation**: `app/api/search/route.ts`

**Note**:
- Search is case-insensitive
- Only returns public songs (isPublic = true)
- Searches in song titles, artist names, album titles, and artist bios
- Results are relevance-sorted by database full-text search

</details>

---

## Sharing Endpoints

API endpoints for creating and tracking shareable links for content.

### POST /api/share/song/{id}
**Description**: Create a shareable link for a song that can be distributed on social media or messaging.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Song UUID

**Response** (200 OK):
```json
{
  "token": "unique_share_token",
  "url": "https://sonic-cloud.com/s/unique_share_token"
}
```

**Error Responses**:
- 404 Not Found: Song not found

**Implementation**: `app/api/share/song/[id]/route.ts`

**Note**: Share tokens are unique 10-character alphanumeric strings. Multiple share links can be created for the same song.

</details>

---

### POST /api/share/playlist/{id}
**Description**: Create a shareable link for a playlist.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Playlist UUID

**Response** (200 OK):
```json
{
  "token": "unique_share_token",
  "url": "https://sonic-cloud.com/s/unique_share_token"
}
```

**Error Responses**:
- 404 Not Found: Playlist not found
- 403 Forbidden: Playlist is private

**Implementation**: `app/api/share/playlist/[id]/route.ts`

**Note**: Only public playlists can be shared.

</details>

---

### POST /api/share/album/{id}
**Description**: Create a shareable link for an album.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `id` (string): Album UUID

**Response** (200 OK):
```json
{
  "token": "unique_share_token",
  "url": "https://sonic-cloud.com/s/unique_share_token"
}
```

**Error Responses**:
- 404 Not Found: Album not found

**Implementation**: `app/api/share/album/[id]/route.ts`

</details>

---

### GET /api/share/{token}
**Description**: Resolve a share token and retrieve the shared content details.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `token` (string): Share token from shareable link

**Response** (200 OK):
```json
{
  "type": "SONG", // or "PLAYLIST", "ALBUM"
  "targetId": "uuid",
  "clickCount": 42,
  "content": {
    "id": "uuid",
    "title": "Song/Playlist/Album Title",
    "coverUrl": "https://example.com/cover.jpg",
    "artist": {
      "id": "uuid",
      "name": "Artist Name"
    }
    // Additional fields based on type
  }
}
```

**Error Responses**:
- 404 Not Found: Share token not found or expired

**Implementation**: `app/api/share/[token]/route.ts`

</details>

---

### POST /api/share/{token}/click
**Description**: Track when a share link is clicked. Used for analytics.

**Authentication**: Not required

<details>
<summary>🔧 Technical Details</summary>

**URL Parameters**:
- `token` (string): Share token

**Response** (200 OK):
```json
{
  "clickCount": 43
}
```

**Error Responses**:
- 404 Not Found: Share token not found

**Implementation**: `app/api/share/[token]/click/route.ts`

**Note**: This endpoint is automatically called when a user opens a share link. It increments the click counter for analytics.

</details>

---

## Authentication & Authorization

### JWT Token Format

All authenticated endpoints require a JWT token in the Authorization header:

```
Authorization: Bearer <jwt_token>
```

Tokens are issued on successful login or registration and contain:
- User ID
- Email
- Role
- Expiration timestamp

### Token Expiration

JWT tokens expire after 7 days by default. After expiration, users must log in again to receive a new token.

### Permission Levels

| Role | Permissions |
|------|-------------|
| **USER** | Create playlists, like songs, follow artists |
| **ARTIST** | USER permissions + upload songs, create albums, manage artist profile |
| **LABEL** | USER permissions + manage label profile, invite artists |
| **ADMIN** | All permissions + verify artists, moderate content |

---

## Rate Limiting

All API endpoints are subject to rate limiting to prevent abuse:

| Endpoint Type | Rate Limit |
|---------------|------------|
| Authentication | 5 requests per minute per IP |
| Song upload | 10 requests per hour per user |
| Play tracking | 1 request per song per user per minute |
| Search | 30 requests per minute per IP |
| General API | 100 requests per minute per user |

Rate limit headers are included in responses:
```
X-RateLimit-Limit: 100
X-RateLimit-Remaining: 95
X-RateLimit-Reset: 1609459200
```

---

## Error Response Format

All error responses follow a consistent format:

```json
{
  "error": {
    "message": "Human-readable error message",
    "code": "ERROR_CODE",
    "details": {
      "field": "Additional context"
    }
  }
}
```

### Common HTTP Status Codes

| Code | Meaning |
|------|---------|
| 200 | Success |
| 201 | Created |
| 204 | No Content (successful deletion) |
| 400 | Bad Request (invalid input) |
| 401 | Unauthorized (missing or invalid token) |
| 403 | Forbidden (insufficient permissions) |
| 404 | Not Found (resource doesn't exist) |
| 409 | Conflict (duplicate resource) |
| 429 | Too Many Requests (rate limit exceeded) |
| 500 | Internal Server Error |

---

## Data Types & Formats

### Date/Time Format
All timestamps use ISO 8601 format:
```
2025-01-01T00:00:00.000Z
```

### UUID Format
All entity IDs use UUID v4:
```
123e4567-e89b-12d3-a456-426614174000
```

### Duration Format
Song durations are in seconds (integer):
```json
{
  "duration": 240  // 4 minutes
}
```

### URL Format
All URLs must be valid HTTPS URLs:
```
https://example.com/file.mp3
```

---

## API Versioning

Current API version: **v1**

The API is versioned in the URL path. Future versions will be released as:
```
/api/v2/...
```

Version 1 endpoints will be supported for at least 12 months after v2 release.

---

## SDK & Client Libraries

Official client libraries are in development for:

- JavaScript/TypeScript (Browser & Node.js)
- Python
- Swift (iOS)
- Kotlin (Android)

Community-maintained libraries may be available. Check the [GitHub repository](https://github.com/sonic-cloud) for updates.

---

## Support & Resources

- **API Status**: [status.sonic-cloud.com](https://status.sonic-cloud.com)
- **Documentation**: [docs.sonic-cloud.com](https://docs.sonic-cloud.com)
- **GitHub Issues**: [github.com/sonic-cloud/issues](https://github.com/sonic-cloud/issues)
- **Developer Discord**: [discord.gg/sonic-cloud](https://discord.gg/sonic-cloud)

---

**Last Updated**: December 18, 2025
**API Version**: v1.0.0