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<?php
/**
 * Like/Unlike Track
 * POST /api/radio/v1/tracks/{id}/like
 * 
 * Toggle like status for a track
 */

$pdo = getDBConnection();

// Get station_id from authenticated station (optional - can be public)
$station_id = $station['id'] ?? null;

// Get track_id from URL or request
$track_id = $_GET['track_id'] ?? json_decode(file_get_contents('php://input'), true)['track_id'] ?? null;

if (!$track_id) {
    http_response_code(400);
    echo json_encode(['error' => 'track_id is required']);
    exit;
}

// Get user info if available
$user_id = $_SESSION['user_id'] ?? null;
$ip_address = $_SERVER['REMOTE_ADDR'] ?? null;
$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? null;

// Check if already liked
$stmt = $pdo->prepare("
    SELECT id FROM radio_track_likes 
    WHERE station_id = ? AND track_id = ? 
    AND (user_id = ? OR (user_id IS NULL AND ip_address = ?))
    LIMIT 1
");

$stmt->execute([$station_id, $track_id, $user_id, $ip_address]);
$existing_like = $stmt->fetch();

if ($existing_like) {
    // Unlike - remove the like
    $pdo->prepare("DELETE FROM radio_track_likes WHERE id = ?")->execute([$existing_like['id']]);
    
    // Update cache
    $pdo->prepare("
        UPDATE music_tracks 
        SET radio_like_count = GREATEST(0, radio_like_count - 1)
        WHERE id = ?
    ")->execute([$track_id]);
    
    $liked = false;
} else {
    // Like - add the like
    $stmt = $pdo->prepare("
        INSERT INTO radio_track_likes (station_id, track_id, user_id, ip_address, user_agent)
        VALUES (?, ?, ?, ?, ?)
    ");
    $stmt->execute([$station_id, $track_id, $user_id, $ip_address, $user_agent]);
    
    // Update cache
    $pdo->prepare("
        UPDATE music_tracks 
        SET radio_like_count = radio_like_count + 1
        WHERE id = ?
    ")->execute([$track_id]);
    
    $liked = true;
}

// Get updated like count
$stmt = $pdo->prepare("SELECT radio_like_count FROM music_tracks WHERE id = ?");
$stmt->execute([$track_id]);
$track = $stmt->fetch(PDO::FETCH_ASSOC);

echo json_encode([
    'success' => true,
    'liked' => $liked,
    'like_count' => (int)($track['radio_like_count'] ?? 0)
]);