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<?php
/**
 * API endpoint to generate signed audio tokens for JavaScript
 * Returns a signed URL for streaming audio
 */

header('Content-Type: application/json');

session_start();
require_once __DIR__ . '/../utils/audio_token.php';
require_once __DIR__ . '/../config/database.php';

// Get parameters
$trackId = $_GET['track_id'] ?? $_POST['track_id'] ?? null;
$variationIndex = isset($_GET['variation']) ? (int)$_GET['variation'] : (isset($_POST['variation']) ? (int)$_POST['variation'] : null);

if (!$trackId || !is_numeric($trackId)) {
    http_response_code(400);
    echo json_encode(['success' => false, 'error' => 'Invalid track ID']);
    exit;
}

// Optional: Verify track exists and is accessible
$pdo = getDBConnection();
if ($pdo) {
    $stmt = $pdo->prepare("SELECT id, is_public, user_id FROM music_tracks WHERE id = ? AND status = 'complete'");
    $stmt->execute([$trackId]);
    $track = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$track) {
        http_response_code(404);
        echo json_encode(['success' => false, 'error' => 'Track not found']);
        exit;
    }
    
    // Check access
    $user_id = $_SESSION['user_id'] ?? null;
    $hasAccess = false;
    
    if ($user_id && $track['user_id'] == $user_id) {
        $hasAccess = true;
    } elseif ($track['is_public'] == 1 || $track['is_public'] === null) {
        $hasAccess = true;
    }
    
    if (!$hasAccess) {
        http_response_code(403);
        echo json_encode(['success' => false, 'error' => 'Access denied']);
        exit;
    }
}

// Generate signed URL
$signedUrl = getSignedAudioUrl($trackId, $variationIndex);
$tokenData = generateAudioToken($trackId, $variationIndex);

echo json_encode([
    'success' => true,
    'url' => $signedUrl,
    'token' => $tokenData['token'],
    'expires' => $tokenData['expires'],
    'expires_in' => $tokenData['expires'] - time()
]);