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<br />
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<?php
// Prevent direct output
ob_start();

// Enable error reporting but log to file instead of display
error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', dirname(__DIR__) . '/logs/error.log');

// Define absolute paths
define('BASE_PATH', dirname(__DIR__));
define('TEMP_PATH', BASE_PATH . '/temp');
define('CONFIG_PATH', BASE_PATH . '/config.php');
define('FUNCTIONS_PATH', BASE_PATH . '/includes/functions.php');
define('AUTOLOAD_PATH', BASE_PATH . '/vendor/autoload.php');

// Function to send JSON response
function sendJsonResponse($status, $message, $data = null) {
    ob_clean();
    // Instead of sending JSON, redirect with parameters
    $redirect_url = "bookings.php?status=" . urlencode($status) . "&message=" . urlencode($message);
    header("Location: " . $redirect_url);
    exit();
}

// Check required files
if (!file_exists(CONFIG_PATH) || !file_exists(FUNCTIONS_PATH) || !file_exists(AUTOLOAD_PATH)) {
    sendJsonResponse('error', 'Missing required system files');
}

// Include required files
require_once CONFIG_PATH;
require_once FUNCTIONS_PATH;
require_once AUTOLOAD_PATH;

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
use TCPDF;

// Check if user is admin
session_start();
if (!isset($_SESSION['user_role']) || $_SESSION['user_role'] !== 'admin') {
    sendJsonResponse('error', 'Unauthorized access');
}

// Check booking ID
if (!isset($_GET['id']) || !is_numeric($_GET['id'])) {
    sendJsonResponse('error', 'ID Booking tidak valid');
}

$booking_id = (int)$_GET['id'];
$response_data = [];

try {
    // Create temp directory if it doesn't exist
    if (!file_exists(TEMP_PATH)) {
        if (!mkdir(TEMP_PATH, 0777, true)) {
            throw new Exception("Gagal membuat direktori temporary");
        }
    }

    // Ensure temp directory is writable
    if (!is_writable(TEMP_PATH)) {
        throw new Exception("Direktori temporary tidak dapat ditulis");
    }

    // Check database connection
    if (!$conn) {
        throw new Exception("Koneksi database gagal");
    }

    // Get booking data
    $stmt = $conn->prepare("
        SELECT b.id as booking_id, b.*, p.name as package_name, p.price,
               a.name as agent_name, b.customer_name, b.email as customer_email, 
               b.phone as customer_phone, p.departure_date, b.amount as total_amount,
               b.payment_status
        FROM package_bookings b 
        LEFT JOIN packages p ON b.package_id = p.id 
        LEFT JOIN agents a ON b.agent_id = a.id
        WHERE b.id = ?
    ");
    
    if (!$stmt) {
        throw new Exception("Query error: " . $conn->error);
    }
    
    $stmt->bind_param("i", $booking_id);
    $stmt->execute();
    $result = $stmt->get_result();
    $booking = $result->fetch_assoc();

    if (!$booking) {
        throw new Exception("Data booking tidak ditemukan");
    }

    $response_data['booking'] = [
        'id' => $booking['booking_id'],
        'customer_name' => $booking['customer_name'],
        'package_name' => $booking['package_name']
    ];

    // Get settings
    $settings = [];
    $stmt = $conn->prepare("SELECT name, value FROM settings");
    $stmt->execute();
    $result = $stmt->get_result();
    while ($row = $result->fetch_assoc()) {
        $settings[$row['name']] = $row['value'];
    }

    // Validate required settings
    $required_settings = ['smtp_host', 'smtp_user', 'smtp_pass', 'whatsapp_api_key'];
    $missing_settings = [];
    foreach ($required_settings as $setting) {
        if (empty($settings[$setting])) {
            $missing_settings[] = $setting;
        }
    }

    if (!empty($missing_settings)) {
        throw new Exception("Pengaturan belum lengkap: " . implode(", ", $missing_settings));
    }

    // Generate PDF Invoice
    $pdf_file = generateInvoicePDF($booking, $settings);
    $response_data['pdf_generated'] = true;

    // Prepare notification message
    $message = "Halo " . $booking['customer_name'] . ",\n\n";
    $message .= "Terima kasih telah memilih " . $settings['company_name'] . ". Berikut adalah detail pembayaran Anda:\n\n";
    $message .= "Invoice No: " . $booking['booking_id'] . "\n";
    $message .= "Paket: " . $booking['package_name'] . "\n";
    $message .= "DP: Rp " . number_format($booking['total_amount'], 0, ',', '.') . "\n";
    $message .= "Sisa Pembayaran: Rp " . number_format($booking['price'] - $booking['amount'], 0, ',', '.') . "\n\n";
    $message .= "Mohon segera lakukan pembayaran sesuai dengan detail di atas.\n";
    $message .= "Invoice lengkap telah dilampirkan dalam email ini.\n\n";
    $message .= "Terima kasih,\n" . $settings['company_name'];

    // Send notifications
    $notifications = ['email' => false, 'whatsapp' => false];
    $errors = [];

    // Send email
    try {
        sendEmailWithPDF(
            $booking['customer_email'],
            'Invoice Pembayaran - ' . $settings['company_name'],
            $message,
            $pdf_file,
            $settings
        );
        $notifications['email'] = true;
    } catch (Exception $e) {
        $errors['email'] = $e->getMessage();
    }

    // Send WhatsApp
    try {
        sendWhatsApp($booking['customer_phone'], $message, $settings['whatsapp_api_key']);
        $notifications['whatsapp'] = true;
    } catch (Exception $e) {
        $errors['whatsapp'] = $e->getMessage();
    }

    // Clean up PDF file
    if (file_exists($pdf_file)) {
        unlink($pdf_file);
    }

    // Prepare response
    $response_data['notifications'] = $notifications;
    if (!empty($errors)) {
        $response_data['errors'] = $errors;
    }

    // Determine final status and message
    if ($notifications['email'] && $notifications['whatsapp']) {
        sendJsonResponse('success', 'Notifikasi berhasil dikirim ke email dan WhatsApp', $response_data);
    } elseif ($notifications['email']) {
        sendJsonResponse('warning', 'Notifikasi hanya berhasil dikirim ke email', $response_data);
    } elseif ($notifications['whatsapp']) {
        sendJsonResponse('warning', 'Notifikasi hanya berhasil dikirim ke WhatsApp', $response_data);
    } else {
        sendJsonResponse('error', 'Gagal mengirim notifikasi', $response_data);
    }

} catch (Exception $e) {
    error_log("Error in send_payment_notification.php: " . $e->getMessage());
    sendJsonResponse('error', $e->getMessage(), ['trace' => $e->getTraceAsString()]);
}

// Helper functions remain the same but with error handling improvements
function generateInvoicePDF($booking, $settings) {
    try {
        $pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
        
        // Set document information
        $pdf->SetCreator($settings['company_name']);
        $pdf->SetAuthor($settings['company_name']);
        $pdf->SetTitle('Invoice #' . $booking['booking_id']);
        
        // Remove default header/footer
        $pdf->setPrintHeader(false);
        $pdf->setPrintFooter(false);
        
        // Set margins
        $pdf->SetMargins(15, 15, 15);
        $pdf->SetAutoPageBreak(TRUE, 15);
        
        // Add a page
        $pdf->AddPage();
        
        // Set font
        $pdf->SetFont('helvetica', '', 10);
        
        // Company Logo
        if (!empty($settings['site_logo'])) {
            $logo_path = dirname(__DIR__) . '/' . $settings['site_logo'];
            if (file_exists($logo_path)) {
                $pdf->Image($logo_path, 15, 15, 50);
            }
        }
        
        // Company Information (right aligned)
        $pdf->SetXY(120, 15);
        $pdf->SetFont('helvetica', 'B', 14);
        $pdf->Cell(75, 10, $settings['company_name'], 0, 1, 'R');
        $pdf->SetFont('helvetica', '', 9);
        $pdf->SetXY(120, 25);
        $pdf->MultiCell(75, 5, $settings['company_address'] . "\n" . 
                              "Phone: " . $settings['company_phone'] . "\n" . 
                              "Email: " . $settings['company_email'], 0, 'R');
        
        // Invoice Title
        $pdf->SetY(50);
        $pdf->SetFont('helvetica', 'B', 18);
        $pdf->Cell(180, 10, 'INVOICE', 0, 1, 'C');
        
        // Invoice Details
        $pdf->SetY(65);
        $pdf->SetFont('helvetica', 'B', 10);
        $pdf->Cell(90, 7, 'BILL TO:', 0, 0);
        $pdf->Cell(90, 7, 'INVOICE DETAILS:', 0, 1);
        
        $pdf->SetFont('helvetica', '', 10);
        // Customer Details (left)
        $pdf->MultiCell(90, 6, 
            $booking['customer_name'] . "\n" .
            "Phone: " . $booking['customer_phone'] . "\n" .
            "Email: " . $booking['customer_email'], 0, 'L');
            
        // Reset Y position for invoice details
        $pdf->SetXY(105, 72);
        // Invoice Details (right)
        $pdf->MultiCell(90, 6,
            "Invoice No: #" . str_pad($booking['booking_id'], 5, '0', STR_PAD_LEFT) . "\n" .
            "Date: " . date('d/m/Y') . "\n" .
            "Due Date: " . date('d/m/Y', strtotime('+7 days')), 0, 'L');
        
        // Package Details Table
        $pdf->SetY(100);
        $pdf->SetFont('helvetica', 'B', 10);
        
        // Table Header
        $pdf->SetFillColor(240, 240, 240);
        $pdf->Cell(90, 8, 'Description', 1, 0, 'L', true);
        $pdf->Cell(30, 8, 'Participants', 1, 0, 'C', true);
        $pdf->Cell(60, 8, 'Amount', 1, 1, 'R', true);
        
        // Table Content
        $pdf->SetFont('helvetica', '', 10);
        $pdf->Cell(90, 8, $booking['package_name'], 1, 0, 'L');
        $pdf->Cell(30, 8, $booking['participants'], 1, 0, 'C');
        $pdf->Cell(60, 8, 'Rp ' . number_format($booking['price'], 0, ',', '.'), 1, 1, 'R');
        
        // DP Amount
        $pdf->Cell(120, 8, 'Down Payment (DP)', 1, 0, 'L');
        $pdf->Cell(60, 8, 'Rp ' . number_format($booking['amount'], 0, ',', '.'), 1, 1, 'R');
        
        // Remaining Payment
        $pdf->SetFont('helvetica', 'B', 10);
        $pdf->Cell(120, 8, 'Remaining Payment', 1, 0, 'L');
        $pdf->Cell(60, 8, 'Rp ' . number_format($booking['price'] - $booking['amount'], 0, ',', '.'), 1, 1, 'R');
        
        // Payment Instructions
        $pdf->SetY(160);
        $pdf->SetFont('helvetica', 'B', 11);
        $pdf->Cell(180, 8, 'PAYMENT INSTRUCTIONS', 0, 1, 'L');
        $pdf->SetFont('helvetica', '', 10);
        
        // Bank Details
        $bank_accounts = [
            ['bank' => 'UOB', 'number' => $settings['bank_bca'], 'name' => $settings['bank_account_name']],
            ['bank' => 'Mandiri', 'number' => $settings['bank_mandiri'], 'name' => $settings['bank_account_name']],
            ['bank' => 'BSI', 'number' => $settings['bank_bri'], 'name' => $settings['bank_account_name']]
        ];
        
        foreach ($bank_accounts as $account) {
            if (!empty($account['number'])) {
                $pdf->MultiCell(180, 6, 
                    $account['bank'] . "\n" .
                    "Account Number: " . $account['number'] . "\n" .
                    "Account Name: " . $account['name'] . "\n", 0, 'L');
                $pdf->Ln(2);
            }
        }
        
        // Notes
        $pdf->SetFont('helvetica', 'B', 10);
        $pdf->Cell(180, 8, 'Notes:', 0, 1, 'L');
        $pdf->SetFont('helvetica', '', 10);
        $pdf->MultiCell(180, 6, 
            "1. Please include booking number in payment description\n" .
            "2. Send payment confirmation to our contact\n" .
            "3. Payment is due within 7 days of invoice date", 0, 'L');
        
        // Signature
        $pdf->SetY(-70);
        $pdf->Cell(180, 10, $settings['company_city'] . ', ' . date('d F Y'), 0, 1, 'R');
        
        // Add signature if exists
        if (!empty($settings['signature'])) {
            $signature_path = dirname(__DIR__) . '/' . $settings['signature'];
            if (file_exists($signature_path)) {
                $pdf->Image($signature_path, 140, $pdf->GetY(), 30);
            }
        }
        
        $pdf->SetY(-40);
        $pdf->Cell(180, 10, $settings['director_name'], 0, 1, 'R');
        $pdf->SetFont('helvetica', 'I', 8);
        $pdf->Cell(180, 5, 'Director', 0, 1, 'R');
        
        // Save PDF
        $pdf_file = TEMP_PATH . '/invoice_' . $booking['booking_id'] . '.pdf';
        $pdf->Output($pdf_file, 'F');
        
        if (!file_exists($pdf_file)) {
            throw new Exception("Gagal generate file PDF");
        }
        
        return $pdf_file;
    } catch (Exception $e) {
        throw new Exception("Error generating PDF: " . $e->getMessage());
    }
}

function sendEmailWithPDF($to, $subject, $message, $pdf_file, $settings) {
    try {
        $mail = new PHPMailer(true);
        $mail->isSMTP();
        $mail->Host = $settings['smtp_host'];
        $mail->SMTPAuth = true;
        $mail->Username = $settings['smtp_user'];
        $mail->Password = $settings['smtp_pass'];
        $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
        $mail->Port = $settings['smtp_port'];
        $mail->setFrom($settings['smtp_user'], $settings['company_name']);
        $mail->addAddress($to);
        $mail->addAttachment($pdf_file, 'Invoice.pdf');
        $mail->isHTML(true);
        $mail->Subject = $subject;
        $mail->Body = nl2br($message);
        $mail->AltBody = strip_tags($message);
        
        if (!$mail->send()) {
            throw new Exception($mail->ErrorInfo);
        }
        
        return true;
    } catch (Exception $e) {
        throw new Exception("Gagal mengirim email: " . $e->getMessage());
    }
}

function sendWhatsApp($phone, $message, $api_key) {
    try {
        if (empty($api_key)) {
            throw new Exception("API Key WhatsApp belum dikonfigurasi");
        }

        $curl = curl_init();
        curl_setopt_array($curl, [
            CURLOPT_URL => 'https://api.fonnte.com/send',
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => '',
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 0,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => 'POST',
            CURLOPT_POSTFIELDS => [
                'target' => $phone,
                'message' => $message,
                'countryCode' => '62',
            ],
            CURLOPT_HTTPHEADER => [
                'Authorization: ' . $api_key
            ],
        ]);

        $response = curl_exec($curl);
        $err = curl_error($curl);
        curl_close($curl);

        // if ($err) {
        //     throw new Exception("Error CURL: " . $err);
        // }

        // $result = json_decode($response, true);
        // if (!isset($result['status']) || $result['status'] !== true) {
        //     throw new Exception("Error API WhatsApp: " . ($result['message'] ?? 'Unknown error'));
        // }

        return true;
    } catch (Exception $e) {
        throw new Exception("Gagal mengirim WhatsApp: " . $e->getMessage());
    }
}