<?php
// Enable error logging
error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', '../logs/php_errors.log');

// Start output buffering
ob_start();

// Function to log errors
function logError($message, $context = []) {
    $logMessage = date('[Y-m-d H:i:s] ') . $message;
    if (!empty($context)) {
        $logMessage .= ' Context: ' . json_encode($context, JSON_UNESCAPED_UNICODE);
    }
    error_log($logMessage);
}

try {
    session_start();
    
    // Log session data
    logError('Session data', [
        'session' => $_SESSION,
        'status_login' => isset($_SESSION['status_login']) ? $_SESSION['status_login'] : 'not set',
        'id_pembeli' => isset($_SESSION['id_pembeli']) ? $_SESSION['id_pembeli'] : 'not set'
    ]);

    include '../config.php';

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

    // Function to send JSON response and exit
    function sendJsonResponse($status, $message, $debug = null) {
        ob_clean(); // Clear any output buffer
        $response = ['status' => $status, 'message' => $message];
        if ($debug !== null) {
            $response['debug'] = $debug;
        }
        echo json_encode($response, JSON_UNESCAPED_UNICODE);
        exit;
    }

    // Log the incoming request
    logError('Processing cancel order request', [
        'POST' => $_POST,
        'SESSION' => $_SESSION
    ]);

    // Pastikan user sudah login
    if (!isset($_SESSION['status_login']) || !$_SESSION['status_login']) {
        echo json_encode(['status' => 'error', 'message' => 'Anda harus login terlebih dahulu']);
        exit;
    }

    // Pastikan ada ID pesanan
    if (!isset($_POST['id_order'])) {
        echo json_encode(['status' => 'error', 'message' => 'ID Pesanan tidak valid']);
        exit;
    }

    $id_order = intval($_POST['id_order']);
    $id_pembeli = $_SESSION['id_pembeli'];

    // Log the query parameters
    logError('Query parameters', [
        'id_order' => $id_order,
        'id_pembeli' => $id_pembeli
    ]);

    // Ambil data pesanan
    $query = mysqli_query($conn, "SELECT * FROM orders WHERE id_order = '$id_order' AND id_pembeli = '$id_pembeli'");
    $order = mysqli_fetch_assoc($query);

    if (!$order) {
        echo json_encode(['status' => 'error', 'message' => 'Pesanan tidak ditemukan']);
        exit;
    }

    // Log order data
    logError('Data pesanan yang ditemukan', [
        'order' => $order,
        'status_order' => $order['status_order'],
        'metode_pembayaran' => $order['metode_pembayaran']
    ]);

    // Cek status pesanan dan metode pembayaran
    $can_cancel = false;
    $message = '';

    if (($order['status_order'] == 'Belum Dibayar' && in_array($order['metode_pembayaran'], ['COD', 'QRIS'])) || 
        ($order['status_order'] == 'Pembayaran Sukses' && $order['metode_pembayaran'] == 'SALDO')) {
        $can_cancel = true;
        $message = 'Pesanan berhasil dibatalkan';
    }

    if (!$can_cancel) {
        echo json_encode(['status' => 'error', 'message' => 'Pesanan tidak dapat dibatalkan. Status: ' . $order['status_order'] . ', Metode: ' . $order['metode_pembayaran']]);
        exit;
    }

    // Mulai transaksi
    mysqli_begin_transaction($conn);

    try {
        // Update status pesanan
        mysqli_query($conn, "UPDATE orders SET status_order = 'Dibatalkan' WHERE id_order = '$id_order'");
        
        // Ambil detail pesanan untuk mengembalikan stok
        $query_details = mysqli_query($conn, "SELECT id_produk, jumlah FROM order_details WHERE id_order = '$id_order'");
        while ($detail = mysqli_fetch_assoc($query_details)) {
            // Kembalikan stok produk
            mysqli_query($conn, "UPDATE produk SET stok = stok + {$detail['jumlah']} WHERE id_produk = {$detail['id_produk']}");
        }
        
        // Jika pembayaran menggunakan saldo, kembalikan saldo
        if ($order['metode_pembayaran'] == 'SALDO') {
            $total_pembayaran = $order['total_harga'] + $order['ongkos_kirim'];
            mysqli_query($conn, "UPDATE pembeli SET saldo = saldo + $total_pembayaran WHERE id_pembeli = '$id_pembeli'");
            
            // Update session saldo
            if (isset($_SESSION['user_global_pembeli']) && is_object($_SESSION['user_global_pembeli'])) {
                $_SESSION['user_global_pembeli']->saldo += $total_pembayaran;
            }
            $message .= ' dan saldo telah dikembalikan';
        }
        
        mysqli_commit($conn);
        echo json_encode(['status' => 'success', 'message' => $message]);
    } catch (Exception $e) {
        mysqli_rollback($conn);
        echo json_encode(['status' => 'error', 'message' => 'Terjadi kesalahan saat membatalkan pesanan']);
    }
} catch (Exception $e) {
    logError('Unexpected error', [
        'error' => $e->getMessage(),
        'trace' => $e->getTraceAsString(),
        'file' => $e->getFile(),
        'line' => $e->getLine()
    ]);
    echo json_encode(['status' => 'error', 'message' => 'Terjadi kesalahan yang tidak terduga', 'details' => $e->getMessage()]);
} catch (Error $e) {
    logError('PHP Error', [
        'error' => $e->getMessage(),
        'trace' => $e->getTraceAsString(),
        'file' => $e->getFile(),
        'line' => $e->getLine()
    ]);
    echo json_encode(['status' => 'error', 'message' => 'Terjadi kesalahan sistem', 'details' => $e->getMessage()]);
}
?>