# Artist Details Page - Implementation Guide

## Overview

Complete Artist Details Page for Spotify Le 2 with neon cyberpunk theme, featuring adaptive layouts for mobile and desktop.

## Files Created

### 1. Provider
- **`frontend/lib/presentation/providers/artist_provider.dart`**
  - `ArtistState` - Contains artist data, tracks, albums, and loading states
  - `ArtistNotifier` - Manages artist data fetching and state
  - `artistProvider` - Riverpod StateNotifierProvider
  - `artistDataProvider` - Family provider for specific artist IDs

### 2. API Endpoints Added
- **`frontend/lib/core/constants/api_constants.dart`**
  - Added `/music/artists` and `/music/albums` endpoints

- **`frontend/lib/infrastructure/datasources/remote/music_api_service.dart`**
  - `getArtist(String artistId)` - Fetch artist details
  - `getArtistTopTracks(String artistId)` - Fetch artist's top tracks
  - `getArtistAlbums(String artistId)` - Fetch artist's albums
  - `getAlbum(String albumId)` - Fetch album details
  - `getAlbumTracks(String albumId)` - Fetch album tracks

### 3. Widgets
- **`frontend/lib/presentation/widgets/artist/artist_track_tile.dart`**
  - Displays track with number, title, duration, and play count
  - Animated playing indicator for currently playing track
  - Add to queue button
  - Neon glow effect for active track

- **`frontend/lib/presentation/widgets/artist/artist_album_card.dart`**
  - Displays album art, title, release year, and track count
  - Gradient border with violet accent
  - Horizontal scrollable layout

### 4. Pages
- **`frontend/lib/presentation/pages/artist/artist_details_page.dart`**
  - Adaptive entry point (mobile/desktop)

- **`frontend/lib/presentation/pages/artist/artist_mobile_page.dart`**
  - Vertical scrolling layout
  - Hero image with gradient overlay
  - Play All button
  - Popular tracks section
  - Horizontal scrolling albums
  - Related tracks section

- **`frontend/lib/presentation/pages/artist/artist_desktop_page.dart`**
  - Two-column layout
  - Larger hero image (220x220)
  - Play All button
  - Popular tracks in left column
  - Albums and related tracks in right column

## Features

### Visual Design
- **Neon Cyberpunk Theme**: Cyan, violet, and rose accent colors
- **Hero Header**: Large artist image with gradient overlay
- **Glow Effects**: Neon glow on active/hovered elements
- **Smooth Animations**: Playing indicator, hover states
- **Genre Tags**: Styled badges for artist genres

### Functionality
- **Load All Data**: Fetches artist, tracks, albums, and recommendations in parallel
- **Play All**: Plays all tracks from the artist
- **Play Track**: Plays specific track and sets queue
- **Add to Queue**: Add individual tracks to queue
- **Error Handling**: Loading states, error messages, retry functionality
- **Responsive Layout**: Adapts between mobile (<800px) and desktop (>=800px)

### Performance
- **Parallel Loading**: All artist data fetched simultaneously
- **State Management**: Efficient Riverpod state handling
- **Lazy Loading**: Related tracks loaded on demand
- **Cached Images**: Uses cached_network_image for album art

## Usage Example

### Navigation

```dart
// Navigate to artist details
Navigator.of(context).push(
  MaterialPageRoute(
    builder: (context) => ArtistDetailsPage(
      artistId: 'artist-id-here',
    ),
  ),
);
```

### Provider Access

```dart
// Watch artist state
final artistState = ref.watch(artistProvider);

// Access artist data
final artist = artistState.artist;
final topTracks = artistState.topTracks;
final albums = artistState.albums;

// Load artist data
ref.read(artistProvider.notifier).loadAllArtistData('artist-id');

// Load specific data
ref.read(artistProvider.notifier).loadArtist('artist-id');
ref.read(artistProvider.notifier).loadTopTracks('artist-id');
ref.read(artistProvider.notifier).loadAlbums('artist-id');
```

### Integration with Search

Update `search_desktop_page.dart` or `search_mobile_page.dart`:

```dart
void _showArtistDetails(Artist artist) {
  Navigator.of(context).push(
    MaterialPageRoute(
      builder: (context) => ArtistDetailsPage(
        artistId: artist.id,
      ),
    ),
  );
}
```

## API Requirements

The backend API should support these endpoints:

```
GET /api/v1/music/artists/{id}
Response: {
  "id": "string",
  "name": "string",
  "image_url": "string?",
  "bio": "string?",
  "genres": ["string"],
  "popularity": int,
  ...
}

GET /api/v1/music/artists/{id}/tracks?limit=10
Response: [
  {
    "id": "string",
    "title": "string",
    "duration": int?,
    "image_url": "string?",
    "play_count": int?,
    ...
  }
]

GET /api/v1/music/artists/{id}/albums?limit=20
Response: [
  {
    "id": "string",
    "title": "string",
    "release_date": "string?",
    "image_url": "string?",
    "total_tracks": int,
    ...
  }
]
```

## Theme Integration

The page uses these theme colors from `AppColors`:

- `AppColors.primary` - Main background (#0A0E27)
- `AppColors.surface` - Card background (#1A1F3A)
- `AppColors.cyan` - Primary accent (#00F0FF)
- `AppColors.violet` - Secondary accent (#BF00FF)
- `AppColors.rose` - Tertiary accent (#FF006E)
- `AppColors.onBackground` - Primary text (#E0E6FF)
- `AppColors.onSurface` - Secondary text (#B0B8D4)
- `AppColors.muted` - Muted text (#6A7294)

## Dependencies

Ensure these packages are in `pubspec.yaml`:

```yaml
dependencies:
  flutter:
    sdk: flutter
  flutter_riverpod: ^2.3.6
  cached_network_image: ^3.2.3
  equatable: ^2.0.5
  dio: ^5.3.2
```

## Future Enhancements

- [ ] Biography section with expandable text
- [ ] Artist followers count
- [ ] Similar artists section
- [ ] Concert/tour dates
- [ ] Social media links
- [ ] Playlists featuring this artist
- [ ] Share functionality
- [ ] Follow/unfollow artist
- [ ] Track duration sorting
- [ ] Album filtering by type (single, EP, album)