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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
session_start();
header('Content-Type: application/json');

// Check if user is logged in
if (!isset($_SESSION['user_id'])) {
    echo json_encode([
        'success' => false,
        'message' => 'User not logged in'
    ]);
    exit;
}

$track_id = $_GET['track_id'] ?? null;

if (!$track_id) {
    echo json_encode([
        'success' => false,
        'message' => 'Track ID required'
    ]);
    exit;
}

try {
    require_once '../config/database.php';
    $pdo = getDBConnection();
    
    // Create user_variation_preferences table if it doesn't exist
    $pdo->exec("
        CREATE TABLE IF NOT EXISTS user_variation_preferences (
            id INT AUTO_INCREMENT PRIMARY KEY,
            user_id INT NOT NULL,
            track_id INT NOT NULL,
            variation_id INT NOT NULL,
            is_main_track BOOLEAN DEFAULT FALSE,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
            FOREIGN KEY (track_id) REFERENCES music_tracks(id) ON DELETE CASCADE,
            FOREIGN KEY (variation_id) REFERENCES audio_variations(id) ON DELETE CASCADE,
            UNIQUE KEY unique_user_track_preference (user_id, track_id)
        )
    ");
    
    // Get track variations from database
    $stmt = $pdo->prepare("
        SELECT 
            av.id,
            av.variation_index,
            av.audio_url,
            av.duration,
            av.title,
            av.created_at
        FROM audio_variations av
        WHERE av.track_id = ? 
        ORDER BY av.variation_index ASC
    ");
    $stmt->execute([$track_id]);
    $variations = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    if (empty($variations)) {
        echo json_encode([
            'success' => true,
            'variations' => [],
            'message' => 'No variations found for this track'
        ]);
        exit;
    }
    
    // Get user's main track preference for this track
    $stmt = $pdo->prepare("
        SELECT variation_id 
        FROM user_variation_preferences 
        WHERE user_id = ? AND track_id = ? AND is_main_track = TRUE
    ");
    $stmt->execute([$_SESSION['user_id'], $track_id]);
    $main_preference = $stmt->fetch(PDO::FETCH_ASSOC);
    
    $main_variation_id = $main_preference ? $main_preference['variation_id'] : null;
    
    // Add is_main_track flag to each variation
    foreach ($variations as &$variation) {
        $variation['is_main_track'] = ($variation['id'] == $main_variation_id);
    }
    
    echo json_encode([
        'success' => true,
        'variations' => $variations,
        'main_variation_id' => $main_variation_id
    ]);
    
} catch (Exception $e) {
    error_log("Error getting variations: " . $e->getMessage());
    echo json_encode([
        'success' => false,
        'message' => 'Internal server error'
    ]);
}
?>