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<?php
/**
 * Toggle Track Visibility within a Crate
 * Allows artist to decide which tracks are visible when crate is public
 * POST: { crate_id: int, track_id: int }
 */
session_start();
header('Content-Type: application/json');

require_once '../config/database.php';

if (!isset($_SESSION['user_id'])) {
    echo json_encode(['success' => false, 'error' => 'Not authenticated']);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode(['success' => false, 'error' => 'Invalid request method']);
    exit;
}

$input = json_decode(file_get_contents('php://input'), true);
$crate_id = isset($input['crate_id']) ? (int)$input['crate_id'] : 0;
$track_id = isset($input['track_id']) ? (int)$input['track_id'] : 0;

if (!$crate_id || !$track_id) {
    echo json_encode(['success' => false, 'error' => 'Crate ID and Track ID are required']);
    exit;
}

try {
    $pdo = getDBConnection();
    
    // Verify crate belongs to user
    $stmt = $pdo->prepare("SELECT id FROM artist_playlists WHERE id = ? AND user_id = ?");
    $stmt->execute([$crate_id, $_SESSION['user_id']]);
    if (!$stmt->fetch()) {
        echo json_encode(['success' => false, 'error' => 'Crate not found or access denied']);
        exit;
    }
    
    // Check if is_public column exists in playlist_tracks
    $checkColumn = $pdo->query("SHOW COLUMNS FROM playlist_tracks LIKE 'is_public'");
    if ($checkColumn->rowCount() === 0) {
        // Add the column if it doesn't exist
        $pdo->exec("ALTER TABLE playlist_tracks ADD COLUMN is_public TINYINT(1) DEFAULT 1");
        error_log("Added is_public column to playlist_tracks table");
    }
    
    // Get current visibility
    $stmt = $pdo->prepare("SELECT is_public FROM playlist_tracks WHERE playlist_id = ? AND track_id = ?");
    $stmt->execute([$crate_id, $track_id]);
    $track = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$track) {
        echo json_encode(['success' => false, 'error' => 'Track not found in crate']);
        exit;
    }
    
    // Toggle visibility
    $current = (bool)($track['is_public'] ?? true);
    $new_visibility = !$current;
    
    $stmt = $pdo->prepare("UPDATE playlist_tracks SET is_public = ? WHERE playlist_id = ? AND track_id = ?");
    $stmt->execute([$new_visibility ? 1 : 0, $crate_id, $track_id]);
    
    echo json_encode([
        'success' => true,
        'is_public' => $new_visibility,
        'message' => $new_visibility ? 'Track is now visible in public crate' : 'Track is now hidden from public crate'
    ]);
    
} catch (Exception $e) {
    error_log("Error toggling crate track visibility: " . $e->getMessage());
    echo json_encode(['success' => false, 'error' => 'Failed to update track visibility']);
}