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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
header('Content-Type: application/json');
require_once '../config/database.php';

$pdo = getDBConnection();

$artist_id = isset($_GET['id']) ? (int)$_GET['id'] : 0;

if ($artist_id <= 0) {
    echo json_encode(['success' => false, 'error' => 'Invalid artist ID']);
    exit;
}

try {
    // OPTIMIZED: Using JOINs instead of correlated subqueries for better performance
    // Get artist data
    $stmt = $pdo->prepare("
        SELECT 
            u.id,
            u.name,
            u.email,
            u.created_at,
            COALESCE(track_stats.track_count, 0) as track_count,
            COALESCE(play_stats.total_plays, 0) as total_plays,
            COALESCE(like_stats.total_likes, 0) as total_likes
        FROM users u
        LEFT JOIN (SELECT user_id, COUNT(*) as track_count FROM music_tracks WHERE status = 'complete' GROUP BY user_id) track_stats ON u.id = track_stats.user_id
        LEFT JOIN (
            SELECT mt.user_id, COUNT(*) as total_plays 
            FROM track_plays tp
            JOIN music_tracks mt ON tp.track_id = mt.id
            GROUP BY mt.user_id
        ) play_stats ON u.id = play_stats.user_id
        LEFT JOIN (
            SELECT mt.user_id, COUNT(*) as total_likes 
            FROM track_likes tl
            JOIN music_tracks mt ON tl.track_id = mt.id
            GROUP BY mt.user_id
        ) like_stats ON u.id = like_stats.user_id
        WHERE u.id = ?
    ");
    
    $stmt->execute([$artist_id]);
    $artist = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if ($artist) {
        echo json_encode([
            'success' => true,
            'artist' => $artist
        ]);
    } else {
        echo json_encode([
            'success' => false,
            'error' => 'Artist not found'
        ]);
    }
    
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'error' => 'Database error: ' . $e->getMessage()
    ]);
}
?>