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<?php

function sanitize($data) {
    global $conn;
    return mysqli_real_escape_string($conn, trim($data));
}

function getFeaturedPackages() {
    global $conn;
    $sql = "SELECT * FROM packages WHERE departure_date > CURDATE() AND status = 'active' ORDER BY created_at DESC LIMIT 6";
    $result = mysqli_query($conn, $sql);
    $packages = [];
    
    while ($row = mysqli_fetch_assoc($result)) {
        $packages[] = $row;
    }
    
    return $packages;
}

function getPackagesByCategory($category) {
    global $conn;
    $category = sanitize($category);
    $sql = "SELECT * FROM packages WHERE category = '$category' AND status = 'active' ORDER BY departure_date ASC";
    $result = mysqli_query($conn, $sql);
    $packages = [];
    
    while ($row = mysqli_fetch_assoc($result)) {
        $packages[] = $row;
    }
    
    return $packages;
}

function getPackageDetails($id) {
    global $conn;
    $id = (int)$id;
    $sql = "SELECT * FROM packages WHERE id = $id AND status = 'active'";
    $result = mysqli_query($conn, $sql);
    return mysqli_fetch_assoc($result);
}
function getMarketingMaterials() {
    global $conn;
    $sql = "SELECT * FROM marketing_materials";
    $result = mysqli_query($conn, $sql);
    return mysqli_fetch_all($result, MYSQLI_ASSOC);
}
function createBooking($data) {
    global $conn;

    // get agent id from referral code
    $reff = isset($data['reff']) ? sanitize($data['reff']) : null;
    var_dump($reff);
    die;
    $sql = "SELECT id FROM agents WHERE referral_code = '$reff'";
    $result = mysqli_query($conn, $sql);
    $agent = mysqli_fetch_assoc($result);
    $agent_id = $agent['id'];
    
    $package_id = (int)$data['package_id'];
    $customer_name = sanitize($data['customer_name']);
    $email = sanitize($data['email']);
    $phone = sanitize($data['phone']);
    $participants = (int)$data['participants'];
    $sql = "INSERT INTO bookings (package_id, agent_id, customer_name, email, phone, participants) 
            VALUES ($package_id, $agent_id, '$customer_name', '$email', '$phone', $participants)";
    
    return mysqli_query($conn, $sql);
}

function uploadImage($file, $destination) {
    $target_dir = "uploads/" . $destination . "/";
    if (!file_exists($target_dir)) {
        mkdir($target_dir, 0777, true);
    }
    
    $file_extension = strtolower(pathinfo($file["name"], PATHINFO_EXTENSION));
    $new_filename = uniqid() . "." . $file_extension;
    $target_file = $target_dir . $new_filename;
    
    $allowed_types = ["jpg", "jpeg", "png", "gif"];
    if (!in_array($file_extension, $allowed_types)) {
        return false;
    }
    
    if (move_uploaded_file($file["tmp_name"], $target_file)) {
        return $target_file;
    }
    
    return false;
}

function isLoggedIn() {
    return isset($_SESSION['user_id']) && !empty($_SESSION['user_id']);
}

function isAdmin() {
    return isset($_SESSION['user_role']) && $_SESSION['user_role'] === 'admin';
}

function requireAdmin() {
    if (!isLoggedIn()) {
        header('Location: /arbainsani/admin/login.php');
        exit;
    }
}

function initSession() {
    if (session_status() === PHP_SESSION_NONE) {
        session_start();
    }
}

function logEvent($type, $message, $level = 'info') {
    global $conn;
    
    $type = sanitize($type);
    $message = sanitize($message);
    $level = sanitize($level);
    
    $sql = "INSERT INTO system_logs (type, message, level) VALUES (?, ?, ?)";
    $stmt = mysqli_prepare($conn, $sql);
    mysqli_stmt_bind_param($stmt, "sss", $type, $message, $level);
    
    return mysqli_stmt_execute($stmt);
}

function validateInput($data, $rules = []) {
    $errors = [];
    foreach ($rules as $field => $rule) {
        if (!isset($data[$field]) || empty($data[$field])) {
            if (isset($rule['required']) && $rule['required']) {
                $errors[$field] = $rule['message'] ?? "Field $field is required";
            }
        }
    }
    return $errors;
}

function initDatabase() {
    global $conn;
    if (!$conn) {
        $conn = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
        if (!$conn) {
            die("Connection failed: " . mysqli_connect_error());
        }
        mysqli_set_charset($conn, "utf8mb4");
    }
    return $conn;
}

function getGalleryImages($category = null) {
    global $conn;
    
    $sql = "SELECT * FROM gallery";
    if ($category) {
        $category = sanitize($category);
        $sql .= " WHERE category = '$category'";
    }
    $sql .= " ORDER BY created_at DESC";
    
    $result = mysqli_query($conn, $sql);
    $images = [];
    
    while ($row = mysqli_fetch_assoc($result)) {
        $images[] = $row;
    }
    
    return $images;
}

function getTestimonials($limit = 6) {
    global $conn;
    $limit = (int)$limit;
    
    $sql = "SELECT t.*, p.name as package_name 
            FROM testimonials t 
            LEFT JOIN packages p ON t.package_id = p.id 
            WHERE t.status = 'approved' 
            ORDER BY t.created_at DESC 
            LIMIT $limit";
    
    $result = mysqli_query($conn, $sql);
    $testimonials = [];
    
    while ($row = mysqli_fetch_assoc($result)) {
        $testimonials[] = $row;
    }
    
    return $testimonials;
}

function generateResponse($success, $message, $data = null) {
    $response = [
        'success' => $success,
        'message' => $message
    ];
    
    if ($data !== null) {
        $response['data'] = $data;
    }
    
    header('Content-Type: application/json');
    echo json_encode($response);
    exit;
}

function createNotification($user_id, $type, $title, $message) {
    global $conn;
    
    $user_id = (int)$user_id;
    $type = sanitize($type);
    $title = sanitize($title);
    $message = sanitize($message);
    
    $sql = "INSERT INTO notifications (user_id, type, title, message) 
            VALUES ($user_id, '$type', '$title', '$message')";
    
    return mysqli_query($conn, $sql);
}

function getUnreadNotificationsCount($user_id) {
    global $conn;
    $user_id = (int)$user_id;
    
    $sql = "SELECT COUNT(*) as count FROM notifications 
            WHERE user_id = $user_id AND read_at IS NULL";
    $result = mysqli_query($conn, $sql);
    $row = mysqli_fetch_assoc($result);
    
    return $row['count'];
}

function formatBytes($bytes, $precision = 2) {
    $units = ['B', 'KB', 'MB', 'GB', 'TB'];
    
    $bytes = max($bytes, 0);
    $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
    $pow = min($pow, count($units) - 1);
    
    $bytes /= pow(1024, $pow);
    
    return round($bytes, $precision) . ' ' . $units[$pow];
}

function timeAgo($datetime) {
    $time = strtotime($datetime);
    $current = time();
    $difference = $current - $time;
    
    $intervals = [
        31536000 => 'year',
        2592000 => 'month',
        604800 => 'week',
        86400 => 'day',
        3600 => 'hour',
        60 => 'minute',
        1 => 'second'
    ];
    
    foreach ($intervals as $seconds => $label) {
        $interval = floor($difference / $seconds);
        
        if ($interval >= 1) {
            return $interval . ' ' . $label . ($interval > 1 ? 's' : '') . ' ago';
        }
    }
    
    return 'just now';
}

function validateEmail($email) {
    return filter_var($email, FILTER_VALIDATE_EMAIL);
}

function validatePhone($phone) {
    // Basic phone validation for Indonesian numbers
    return preg_match('/^(\+62|62|0)8[1-9][0-9]{6,9}$/', $phone);
}

function generateInvoiceNumber() {
    $prefix = 'INV';
    $year = date('Y');
    $month = date('m');
    $random = strtoupper(substr(uniqid(), -4));
    
    return $prefix . $year . $month . $random;
}

function calculateBookingTotal($package_price, $participants, $addons = []) {
    $total = $package_price * $participants;
    
    foreach ($addons as $addon) {
        $total += $addon['price'] * $participants;
    }
    
    return $total;
}

function sendBookingConfirmation($booking_id) {
    global $conn;
    $booking_id = (int)$booking_id;
    
    $sql = "SELECT b.*, p.name as package_name, p.departure_date 
            FROM bookings b 
            LEFT JOIN packages p ON b.package_id = p.id 
            WHERE b.id = $booking_id";
    
    $result = mysqli_query($conn, $sql);
    $booking = mysqli_fetch_assoc($result);
    
    if ($booking) {
        $to = $booking['email'];
        $subject = "Booking Confirmation - " . $booking['package_name'];
        
        $message = "Dear " . $booking['customer_name'] . ",\n\n";
        $message .= "Thank you for booking with Arbain Sani Travel.\n";
        $message .= "Your booking details:\n";
        $message .= "Package: " . $booking['package_name'] . "\n";
        $message .= "Departure Date: " . date('d M Y', strtotime($booking['departure_date'])) . "\n";
        $message .= "Participants: " . $booking['participants'] . "\n";
        $message .= "Total Amount: Rp " . number_format($booking['total_amount']) . "\n\n";
        $message .= "Please complete your payment to confirm your booking.\n";
        $message .= "For any questions, please contact us.\n\n";
        $message .= "Best regards,\nArbain Sani Travel Team";
        
        $headers = "From: " . getSetting('company_email') . "\r\n";
        
        return mail($to, $subject, $message, $headers);
    }
    
    return false;
}

function getBookingStatus($status) {
    $statuses = [
        'pending' => ['label' => 'Pending', 'class' => 'warning'],
        'confirmed' => ['label' => 'Confirmed', 'class' => 'success'],
        'cancelled' => ['label' => 'Cancelled', 'class' => 'danger'],
        'completed' => ['label' => 'Completed', 'class' => 'info']
    ];
    
    return $statuses[$status] ?? ['label' => ucfirst($status), 'class' => 'secondary'];
}

function generateSitemap() {
    global $conn;
    
    $sitemap = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"/>');
    
    // Add static pages
    $static_pages = ['', 'about', 'contact', 'gallery'];
    foreach ($static_pages as $page) {
        $url = $sitemap->addChild('url');
        $url->addChild('loc', 'https://' . $_SERVER['HTTP_HOST'] . '/' . $page);
        $url->addChild('changefreq', 'weekly');
        $url->addChild('priority', '0.8');
    }
    
    // Add package pages
    $sql = "SELECT id, updated_at FROM packages WHERE status = 'active'";
    $result = mysqli_query($conn, $sql);
    
    while ($row = mysqli_fetch_assoc($result)) {
        $url = $sitemap->addChild('url');
        $url->addChild('loc', 'https://' . $_SERVER['HTTP_HOST'] . '/package/' . $row['id']);
        $url->addChild('lastmod', date('Y-m-d', strtotime($row['updated_at'])));
        $url->addChild('changefreq', 'daily');
        $url->addChild('priority', '1.0');
    }
    
    // Save sitemap
    $sitemap->asXML('sitemap.xml');
}

function compressImage($source, $destination, $quality = 75) {
    $info = getimagesize($source);
    
    if ($info['mime'] === 'image/jpeg') {
        $image = imagecreatefromjpeg($source);
    } elseif ($info['mime'] === 'image/png') {
        $image = imagecreatefrompng($source);
    } elseif ($info['mime'] === 'image/gif') {
        $image = imagecreatefromgif($source);
    } else {
        return false;
    }
    
    return imagejpeg($image, $destination, $quality);
}

function generateMetaDescription($text, $length = 160) {
    $text = strip_tags($text);
    $text = str_replace(["\n", "\r", "\t"], ' ', $text);
    $text = preg_replace('/\s+/', ' ', $text);
    $text = trim($text);
    
    if (strlen($text) > $length) {
        $text = substr($text, 0, $length - 3) . '...';
    }
    
    return $text;
}

/**
 * Get a setting value from the database
 * 
 * @param string $key Setting key
 * @return mixed Setting value or null if not found
 */
function getSetting($key) {
    global $conn;
    $key = sanitize($key);
    
    $sql = "SELECT value FROM settings WHERE name = '$key'";
    $result = mysqli_query($conn, $sql);
    $row = mysqli_fetch_assoc($result);
    
    return $row ? $row['value'] : null;
}

/**
 * Update a setting in the database
 * 
 * @param string $key Setting key
 * @param mixed $value Setting value
 * @return bool True if successful, false otherwise
 */
function updateSetting($key, $value) {
    global $conn;
    
    $key = mysqli_real_escape_string($conn, $key);
    $value = mysqli_real_escape_string($conn, $value);
    
    $sql = "INSERT INTO settings (name, value) 
            VALUES ('$key', '$value') 
            ON DUPLICATE KEY UPDATE value = VALUES(value)";
    
    return mysqli_query($conn, $sql);
}

/**
 * Get the appropriate badge class for a package category
 * @param string $category Package category
 * @return string Bootstrap badge class
 */
function getCategoryBadgeClass($category) {
    try {
        // logActivity('debug', 'Getting badge class for category: ' . $category);
        switch ($category) {
            case 'umrah':
                return 'primary';
            case 'hajj':
                return 'success';
            case 'halal_tour':
                return 'info';
            default:
                return 'secondary';
        }
    } catch (Exception $e) {
        // logActivity('error', 'Error getting badge class: ' . $e->getMessage());
        return 'secondary';
    }
}

/**
 * Get the appropriate icon for a package category
 * @param string $category Package category
 * @return string HTML icon markup
 */
function getCategoryIcon($category) {
    try {
        // logActivity('debug', 'Getting icon for category: ' . $category);
        switch ($category) {
            case 'umrah':
                return '<i class="fas fa-kaaba me-2"></i>';
            case 'hajj':
                return '<i class="fas fa-mosque me-2"></i>';
            case 'halal_tour':
                return '<i class="fas fa-plane me-2"></i>';
            default:
                return '<i class="fas fa-tag me-2"></i>';
        }
    } catch (Exception $e) {
        // logActivity('error', 'Error getting category icon: ' . $e->getMessage());
        return '<i class="fas fa-tag me-2"></i>';
    }
}

/**
 * Format price in Indonesian Rupiah format
 * @param float $price Price to format
 * @return string Formatted price
 */
function formatPrice($price) {
    try {
        // logActivity('debug', 'Formatting price: ' . $price);
        if (!is_numeric($price)) {
            throw new Exception('Invalid price value');
        }
        return 'Rp ' . number_format($price, 0, ',', '.');
    } catch (Exception $e) {
        // logActivity('error', 'Error formatting price: ' . $e->getMessage());
        return 'Rp 0';
    }
}

/**
 * Format date in Indonesian format
 * @param string $date Date string
 * @return string Formatted date
 */
function formatDate($date) {
    try {
        // logActivity('debug', 'Formatting date: ' . $date);
        $timestamp = strtotime($date);
        if ($timestamp === false) {
            throw new Exception('Invalid date format');
        }
        
        $months = [
            'Januari', 'Februari', 'Maret', 'April', 'Mei', 'Juni',
            'Juli', 'Agustus', 'September', 'Oktober', 'November', 'Desember'
        ];
        
        return date('d', $timestamp) . ' ' . 
               $months[date('n', $timestamp) - 1] . ' ' . 
               date('Y', $timestamp);
    } catch (Exception $e) {
        // logActivity('error', 'Error formatting date: ' . $e->getMessage());
        return 'Tanggal tidak valid';
    }
}

/**
 * Get package status label
 * @param string $status Package status
 * @return array Label text and class
 */
function getPackageStatusLabel($status) {
    try {
        logActivity('debug', 'Getting status label for: ' . $status);
        switch ($status) {
            case 'active':
                return ['text' => 'Tersedia', 'class' => 'success'];
            case 'fully_booked':
                return ['text' => 'Penuh', 'class' => 'warning'];
            case 'completed':
                return ['text' => 'Selesai', 'class' => 'info'];
            case 'cancelled':
                return ['text' => 'Dibatalkan', 'class' => 'danger'];
            default:
                return ['text' => 'Tidak Tersedia', 'class' => 'secondary'];
        }
    } catch (Exception $e) {
        logActivity('error', 'Error getting status label: ' . $e->getMessage());
        return ['text' => 'Error', 'class' => 'danger'];
    }
}

/**
 * Check if a package is available for booking
 * @param array $package Package data
 * @return bool True if available
 */
function isPackageAvailable($package) {
    try {
        logActivity('debug', 'Checking availability for package ID: ' . $package['id']);
        
        // Check status
        if ($package['status'] !== 'active') {
            return false;
        }
        
        // Check departure date
        $departure = strtotime($package['departure_date']);
        if ($departure < time()) {
            return false;
        }
        
        // Check capacity
        if (isset($package['current_bookings']) && 
            isset($package['capacity']) && 
            $package['current_bookings'] >= $package['capacity']) {
            return false;
        }
        
        return true;
    } catch (Exception $e) {
        logActivity('error', 'Error checking package availability: ' . $e->getMessage());
        return false;
    }
}

/**
 * Get remaining slots for a package
 * @param array $package Package data
 * @return int|string Number of slots or 'Tidak Tersedia'
 */
function getRemainingSlots($package) {
    try {
        logActivity('debug', 'Getting remaining slots for package ID: ' . $package['id']);
        
        if (!isset($package['capacity']) || !isset($package['current_bookings'])) {
            throw new Exception('Missing capacity or booking data');
        }
        
        $remaining = $package['capacity'] - $package['current_bookings'];
        return $remaining > 0 ? $remaining : 'Tidak Tersedia';
    } catch (Exception $e) {
        logActivity('error', 'Error getting remaining slots: ' . $e->getMessage());
        return 'Error';
    }
}

/**
 * Calculate package discount if applicable
 * @param array $package Package data
 * @return array Discount percentage and final price
 */
function calculatePackageDiscount($package) {
    try {
        logActivity('debug', 'Calculating discount for package ID: ' . $package['id']);
        
        $discount = 0;
        $final_price = $package['price'];
        
        // Early bird discount
        $departure = strtotime($package['departure_date']);
        $days_until = ceil(($departure - time()) / (60 * 60 * 24));
        if ($days_until > 90) {
            $discount = 10; // 10% off for early birds
        }
        
        // Group discount
        if (isset($package['group_size']) && $package['group_size'] >= 4) {
            $discount = max($discount, 5); // 5% off for groups
        }
        
        // Calculate final price
        if ($discount > 0) {
            $final_price = $package['price'] * (1 - $discount / 100);
        }
        
        return [
            'discount_percentage' => $discount,
            'final_price' => $final_price
        ];
    } catch (Exception $e) {
        logActivity('error', 'Error calculating package discount: ' . $e->getMessage());
        return ['discount_percentage' => 0, 'final_price' => $package['price']];
    }
}

/**
 * Sanitize input to prevent XSS and SQL injection
 * @param string $input Input to sanitize
 * @return string Sanitized input
 */
function sanitizeInput($input) {
    global $conn;
    $input = trim($input);
    $input = stripslashes($input);
    $input = htmlspecialchars($input);
    return mysqli_real_escape_string($conn, $input);
}

/**
 * Log user activity
 * @param string $level Log level (info, warning, error)
 * @param string $message Log message
 * @param array $context Additional context data
 */
// function logActivity($level, $message, $context = []) {
//     try {
//         Logger::log($level, $message, $context);
//     } catch (Exception $e) {
//         error_log("Error logging activity: " . $e->getMessage());
//     }
// }

/**
 * Get and clear a flash message
 * 
 * @param string $key Message key
 * @return string Message or empty string if not found
 */
function getFlashMessage($key) {
    $message = '';
    if (isset($_SESSION['flash_' . $key])) {
        $message = $_SESSION['flash_' . $key];
        unset($_SESSION['flash_' . $key]);
    }
    return $message;
}

/**
 * Set a flash message
 * 
 * @param string $key Message key
 * @param string $message Message content
 */
function setFlashMessage($key, $message) {
    $_SESSION['flash_' . $key] = $message;
}

/**
 * Insert new agent data into the database
 */
function insertAgentData($userData, $uploadedFiles) {
    global $conn;
    
    try {
        // Start transaction
        $conn->begin_transaction();
        
        // Insert into agents table
        $stmt = $conn->prepare("
            INSERT INTO agents (
                user_id, name, nik, email, phone, whatsapp, address, city, 
                province, postal_code, business_name, business_address, 
                instagram_url, facebook_url, tiktok_url, type, status
            ) VALUES (
                ?, ?, ?, ?, ?, ?, ?, ?, 
                ?, ?, ?, ?, 
                ?, ?, ?, ?, 'pending'
            )
        ");
        
        $stmt->bind_param("isssssssssssssss",
            $_SESSION['user_id'],
            $userData['name'],
            $userData['nik'],
            $userData['email'],
            $userData['phone'],
            $userData['whatsapp'],
            $userData['address'],
            $userData['city'],
            $userData['province'],
            $userData['postal_code'],
            $userData['business_name'],
            $userData['business_address'],
            $userData['instagram_url'],
            $userData['facebook_url'],
            $userData['tiktok_url'],
            $userData['type']
        );
        
        $stmt->execute();
        $agentId = $conn->insert_id;
        
        // Insert documents
        foreach ($uploadedFiles as $docType => $filePath) {
            $stmt = $conn->prepare("
                INSERT INTO agent_documents (
                    agent_id, document_type, file_path, status
                ) VALUES (?, ?, ?, 'pending')
            ");
            
            $stmt->bind_param("iss", $agentId, $docType, $filePath);
            $stmt->execute();
        }
        
        // Update user role to agent
        $stmt = $conn->prepare("UPDATE users SET role = 'agent' WHERE id = ?");
        $stmt->bind_param("i", $_SESSION['user_id']);
        $stmt->execute();
        
        // Commit transaction
        $conn->commit();
        return true;
        
    } catch (Exception $e) {
        // Rollback transaction on error
        $conn->rollback();
        error_log("Error in insertAgentData: " . $e->getMessage());
        return false;
    }
}

/**
 * Check if user is already registered as an agent
 */
function isUserAgent($userId) {
    global $conn;
    
    $stmt = $conn->prepare("SELECT id FROM agents WHERE user_id = ?");
    $stmt->bind_param("i", $userId);
    $stmt->execute();
    $result = $stmt->get_result();
    
    return $result->num_rows > 0;
}

/**
 * Get agent status
 */
function getAgentStatus($userId) {
    global $conn;
    
    $stmt = $conn->prepare("SELECT status FROM agents WHERE user_id = ?");
    $stmt->bind_param("i", $userId);
    $stmt->execute();
    $result = $stmt->get_result();
    
    if ($row = $result->fetch_assoc()) {
        return $row['status'];
    }
    
    return null;
}

/**
 * Validate NIK format
 */
function validateNIK($nik) {
    return preg_match('/^\d{16}$/', $nik);
}

/**
 * Validate file upload
 */
function validateFileUpload($file, $allowedTypes = ['image/jpeg', 'image/png', 'application/pdf']) {
    if (!isset($file['error']) || is_array($file['error'])) {
        return false;
    }
    
    if ($file['error'] !== UPLOAD_ERR_OK) {
        return false;
    }
    
    if (!in_array($file['type'], $allowedTypes)) {
        return false;
    }
    
    if ($file['size'] > 5242880) { // 5MB max
        return false;
    }
    
    return true;
}

function registerAgent($conn, $user_id, $data, $documents = []) {
    try {
        // Start transaction
        $conn->begin_transaction();

        // Generate unique referral code
        $referral_code = generateUniqueReferralCode($conn);
        
        // Prepare whatsapp number
        $whatsapp = isset($data['whatsapp']) ? preg_replace('/[^0-9]/', '', $data['whatsapp']) : null;
        
        // Insert agent data
        $stmt = $conn->prepare("
            INSERT INTO agents (
                user_id, 
                referral_code, 
                name,
                nik,
                email,
                phone,
                whatsapp,
                nomor_rekening,
                address,
                city,
                province,
                postal_code,
                business_name,
                business_address,
                instagram_url,
                facebook_url,
                tiktok_url,
                type,
                status,
                created_at
            ) VALUES (
                ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'pending', NOW()
            )
        ");
        
        $stmt->bind_param(
            "isssssssssssssssss",
            $user_id,
            $referral_code,
            $data['name'],
            $data['nik'],
            $data['email'],
            $data['phone'],
            $whatsapp,
            $data['nomor_rekening'],
            $data['address'],
            $data['city'],
            $data['province'],
            $data['postal_code'],
            $data['business_name'],
            $data['business_address'],
            $data['instagram_url'],
            $data['facebook_url'],
            $data['tiktok_url'],
            $data['type']
        );
        
        if (!$stmt->execute()) {
            throw new Exception("Failed to insert agent data");
        }
        
        $agent_id = $conn->insert_id;
        
        // Insert documents
        if (!empty($documents)) {
            $stmt = $conn->prepare("
                INSERT INTO agent_documents (
                    agent_id, 
                    document_type, 
                    file_path, 
                    status
                ) VALUES (?, ?, ?, 'pending')
            ");
            
            foreach ($documents as $docType => $filePath) {
                $stmt->bind_param("iss", $agent_id, $docType, $filePath);
                if (!$stmt->execute()) {
                    throw new Exception("Failed to insert document: " . $docType);
                }
            }
        }
        
        // Update user role
        $stmt = $conn->prepare("UPDATE users SET role = 'agent' WHERE id = ?");
        $stmt->bind_param("i", $user_id);
        
        if (!$stmt->execute()) {
            throw new Exception("Failed to update user role");
        }
        
        // Commit transaction
        $conn->commit();
        return true;
        
    } catch (Exception $e) {
        // Rollback on error
        $conn->rollback();
        error_log("Error registering agent: " . $e->getMessage());
        return false;
    }
}

function generateUniqueReferralCode($conn, $length = 6) {
    do {
        // Generate random code
        $chars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ'; // Excluding similar looking characters
        $code = '';
        for ($i = 0; $i < $length; $i++) {
            $code .= $chars[random_int(0, strlen($chars) - 1)];
        }
        
        // Check if code exists
        $stmt = $conn->prepare("SELECT id FROM agents WHERE referral_code = ?");
        $stmt->bind_param("s", $code);
        $stmt->execute();
        $result = $stmt->get_result();
        
    } while ($result->num_rows > 0); // Keep generating until we find a unique code
    
    return $code;
}

/**
 * Calculate and create agent commission for a booking
 * @param int $booking_id The booking ID
 * @param int $agent_id The agent ID
 * @param float $total_amount The total booking amount
 * @return bool True if successful
 */
function createAgentCommission($booking_id, $agent_id, $total_amount) {
    global $conn;
    
    try {
        // Get agent's commission percentage based on their performance
        $percentage = calculateAgentCommissionPercentage($agent_id);
        
        // Calculate commission amount
        $commission_amount = ($total_amount * $percentage) / 100;
        
        // Insert commission record
        $stmt = $conn->prepare("
            INSERT INTO agent_commissions (
                agent_id, 
                booking_id, 
                amount, 
                percentage, 
                status
            ) VALUES (?, ?, ?, ?, 'pending')
        ");
        
        $stmt->bind_param("iidi", $agent_id, $booking_id, $commission_amount, $percentage);
        return $stmt->execute();
        
    } catch (Exception $e) {
        error_log("Error creating agent commission: " . $e->getMessage());
        return false;
    }
}

/**
 * Calculate agent's commission percentage based on their performance
 * @param int $agent_id The agent ID
 * @return float Commission percentage
 */
function calculateAgentCommissionPercentage($agent_id) {
    global $conn;
    
    try {
        // Get agent's completed bookings count
        $stmt = $conn->prepare("
            SELECT COUNT(*) as completed_bookings
            FROM package_bookings
            WHERE agent_id = ? AND status = 'completed'
        ");
        
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $result = $stmt->get_result()->fetch_assoc();
        $completed_bookings = $result['completed_bookings'];
        
        // Calculate percentage based on performance
        if ($completed_bookings >= 20) {
            return 5.0; // 5% commission for 20+ completed bookings
        } elseif ($completed_bookings >= 10) {
            return 4.0; // 4% commission for 10-19 completed bookings
        } elseif ($completed_bookings >= 5) {
            return 3.0; // 3% commission for 5-9 completed bookings
        } else {
            return 2.0; // 2% base commission
        }
        
    } catch (Exception $e) {
        error_log("Error calculating commission percentage: " . $e->getMessage());
        return 2.0; // Default to base commission on error
    }
}

/**
 * Get agent's total pending commissions
 * @param int $agent_id The agent ID
 * @return float Total pending commission amount
 */
function getAgentPendingCommissions($agent_id) {
    global $conn;
    
    try {
        $stmt = $conn->prepare("
            SELECT SUM(amount) as total_pending
            FROM agent_commissions
            WHERE agent_id = ? AND status = 'pending'
        ");
        
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $result = $stmt->get_result()->fetch_assoc();
        
        return $result['total_pending'] ?? 0;
        
    } catch (Exception $e) {
        error_log("Error getting pending commissions: " . $e->getMessage());
        return 0;
    }
}

/**
 * Get agent's commission history
 * @param int $agent_id The agent ID
 * @return array Array of commission records
 */
function getAgentCommissionHistory($agent_id) {
    global $conn;
    
    try {
        $stmt = $conn->prepare("
            SELECT ac.*, 
                   pb.booking_code,
                   pb.customer_name,
                   p.name as package_name,
                   p.departure_date
            FROM agent_commissions ac
            JOIN package_bookings pb ON ac.booking_id = pb.id
            JOIN packages p ON pb.package_id = p.id
            WHERE ac.agent_id = ?
            ORDER BY ac.created_at DESC
        ");
        
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        return $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
        
    } catch (Exception $e) {
        error_log("Error getting commission history: " . $e->getMessage());
        return [];
    }
}

/**
 * Get agent's performance metrics
 * @param int $agent_id The agent ID
 * @return array Performance metrics
 */
function getAgentPerformanceMetrics($agent_id) {
    global $conn;
    
    try {
        // Get total jamaah (completed bookings participants)
        $stmt = $conn->prepare("
            SELECT SUM(participants) as total_jamaah
            FROM package_bookings
            WHERE agent_id = ? AND payment_status = 'completed'
        ");
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $result = $stmt->get_result()->fetch_assoc();
        $total_jamaah = $result['total_jamaah'] ?? 0;

        // Get total commissions
        $stmt = $conn->prepare("
            SELECT SUM(commission_amount) as total_commission
            FROM agent_commissions
            WHERE agent_id = ?
        ");
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $result = $stmt->get_result()->fetch_assoc();
        $total_commission = $result['total_commission'] ?? 0;

        // Get active packages (packages with future departure dates)
        $stmt = $conn->prepare("
            SELECT COUNT(DISTINCT p.id) as active_packages
            FROM packages p
            JOIN package_bookings b ON p.id = b.package_id
            WHERE b.agent_id = ? 
            AND p.departure_date > CURDATE()
            AND p.status = 'active'
        ");
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $result = $stmt->get_result()->fetch_assoc();
        $active_packages = $result['active_packages'] ?? 0;

        // Get conversion rate
        $stmt = $conn->prepare("
            SELECT 
                COUNT(DISTINCT b.id) as total_bookings,
                COUNT(DISTINCT av.id) as total_visits
            FROM agents a
            LEFT JOIN package_bookings b ON b.agent_id = a.id
            LEFT JOIN agent_page_visits av ON av.agent_id = a.id
            WHERE a.id = ?
        ");
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $result = $stmt->get_result()->fetch_assoc();
        
        $conversion_rate = $result['total_visits'] > 0 
            ? round(($result['total_bookings'] / $result['total_visits']) * 100, 2)
            : 0;

        // Get monthly performance
        $stmt = $conn->prepare("
            SELECT 
                DATE_FORMAT(b.created_at, '%Y-%m') as month,
                COUNT(DISTINCT b.id) as total_bookings,
                SUM(p.price) as revenue
            FROM package_bookings b
            JOIN packages p ON b.package_id = p.id
            WHERE b.agent_id = ?
            GROUP BY DATE_FORMAT(b.created_at, '%Y-%m')
            ORDER BY month DESC
            LIMIT 12
        ");
        $stmt->bind_param("i", $agent_id);
        $stmt->execute();
        $monthly_performance = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);

        return [
            'total_jamaah' => $total_jamaah,
            'total_commission' => $total_commission,
            'active_packages' => $active_packages,
            'conversion_rate' => $conversion_rate,
            'monthly_performance' => $monthly_performance
        ];
        
    } catch (Exception $e) {
        error_log("Error getting agent performance metrics: " . $e->getMessage());
        return [
            'total_jamaah' => 0,
            'total_commission' => 0,
            'active_packages' => 0,
            'conversion_rate' => 0,
            'monthly_performance' => []
        ];
    }
}

initSession();
initDatabase();