in this codes (<?php
// public/orders/add_order.php

// Enable error reporting for debugging (disable in production)
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

// Include authentication and database connection **before** including the header
require_once __DIR__ . '/../../includes/auth.php';
require_once __DIR__ . '/../../includes/db_connect.php';

// Now include the header
require_once '../../includes/header.php';

// Initialize variables
$success = '';
$error = '';

// Fetch products for selection
$products_sql = "SELECT * FROM products ORDER BY name ASC";
$products_result = $conn->query($products_sql);

if (!$products_result) {
    die("Error fetching products: " . $conn->error);
}

// Handle form submission
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Sanitize and validate input
    $customer_name = trim($_POST['customer_name']);
    $contact = trim($_POST['contact']);
    $delivery_address = trim($_POST['delivery_address']);
    $delivery_datetime = isset($_POST['delivery_datetime']) && !empty($_POST['delivery_datetime']) ? trim($_POST['delivery_datetime']) : null;

    // Handle multiple products
    $product_ids = isset($_POST['product_id']) ? $_POST['product_id'] : [];
    $quantities = isset($_POST['quantity']) ? $_POST['quantity'] : [];
    $packaging_preferences = isset($_POST['packaging_preferences']) ? $_POST['packaging_preferences'] : [];

    // Basic validation
    if (empty($customer_name)) {
        $error = "Customer name is required.";
    } elseif (empty($product_ids) || !is_array($product_ids)) {
        $error = "At least one product must be selected.";
    } else {
        // Validate each product entry
        foreach ($product_ids as $index => $pid) {
            if (empty($pid)) {
                $error = "Product selection is required for all items.";
                break;
            }
            if (intval($quantities[$index]) <= 0) {
                $error = "Quantity must be at least 1 for all items.";
                break;
            }
        }

        if ($delivery_datetime && !preg_match("/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}$/", $delivery_datetime)) {
            $error = "Invalid delivery date and time format.";
        } elseif ($delivery_datetime && strtotime(str_replace('T', ' ', $delivery_datetime)) < strtotime(date('Y-m-d H:i'))) {
            $error = "Delivery date and time cannot be in the past.";
        }
    }

    if (empty($error)) {
        // Start transaction
        $conn->begin_transaction();

        try {
            // Insert into customers table using prepared statement
            $stmt = $conn->prepare("INSERT INTO customers (name, contact, delivery_address) VALUES (?, ?, ?)");
            if (!$stmt) {
                throw new Exception("Prepare statement failed: " . $conn->error);
            }
            $stmt->bind_param("sss", $customer_name, $contact, $delivery_address);
            if (!$stmt->execute()) {
                throw new Exception("Execute failed: " . $stmt->error);
            }
            $customer_id = $stmt->insert_id;
            $stmt->close();

            // Insert into orders table using prepared statement
            // Retain the first product in the orders table's product_id
            $first_product_id = intval($product_ids[0]);
            $first_quantity = intval($quantities[0]);
            $first_packaging_preferences = trim($packaging_preferences[0]);

            $stmt = $conn->prepare("INSERT INTO orders (customer_id, product_id, quantity, packaging_preferences, status, order_date, delivery_datetime) VALUES (?, ?, ?, ?, 'Pending', NOW(), ?)");
            if (!$stmt) {
                throw new Exception("Prepare statement failed: " . $conn->error);
            }
            $stmt->bind_param("iiiss", $customer_id, $first_product_id, $first_quantity, $first_packaging_preferences, $delivery_datetime);
            if (!$stmt->execute()) {
                throw new Exception("Execute failed: " . $stmt->error);
            }
            $order_id = $stmt->insert_id;
            $stmt->close();

            // Insert remaining products into order_items table
            if (count($product_ids) > 1) {
                $stmt = $conn->prepare("INSERT INTO order_items (order_id, product_id, quantity, packaging_preferences) VALUES (?, ?, ?, ?)");
                if (!$stmt) {
                    throw new Exception("Prepare statement failed: " . $conn->error);
                }

                // Loop through remaining products (starting from index 1)
                for ($i = 1; $i < count($product_ids); $i++) {
                    $pid = intval($product_ids[$i]);
                    $qty = intval($quantities[$i]);
                    $pack_pref = trim($packaging_preferences[$i]);

                    $stmt->bind_param("iiis", $order_id, $pid, $qty, $pack_pref);
                    if (!$stmt->execute()) {
                        throw new Exception("Execute failed: " . $stmt->error);
                    }
                }
                $stmt->close();
            }

            // Commit transaction
            $conn->commit();

            $success = "Order added successfully!";

            // Reset form fields
            $_POST = [];
        } catch (Exception $e) {
            // Rollback transaction
            $conn->rollback();
            $error = "Error adding order: " . $e->getMessage();
        }
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Add New Order - Kaak Alia Management System</title>
    
    <!-- Google Fonts -->
    <link href="https://fonts.googleapis.com/css2?family=Cairo:wght@400;600;700&display=swap" rel="stylesheet">
    
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="/kaak_alia_management_system/assets/bootstrap/css/bootstrap.min.css">
    
    <!-- Bootstrap Icons -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.5/font/bootstrap-icons.css">
    
    <!-- Embedded Custom Styles -->
    <style>
        /* ---------------------------------------------------
           1. CSS Variables for Consistent Design
        ---------------------------------------------------- */
        :root {
            --dark-gray: #515151; /* Primary text and key elements */
            --soft-brown: #b78d67; /* Secondary color for accents and buttons */
            --deep-brown: #8e6a51; /* Accent color for interactive elements */
            --white: #ffffff; /* White background and button text */
            --light-gray: #f9f9f9; /* Light gray for input backgrounds and alternate table rows */
            --divider-color: #FFD166; /* Yellow for dividers */
            --error-color: #EF476F; /* Red-pink for error messages */
            --success-color: #06D6A0; /* Green for success messages */
            --hover-shadow: rgba(0, 0, 0, 0.2);
            --transition-speed: 0.3s;
        }

        /* ---------------------------------------------------
           2. Global Styles
        ---------------------------------------------------- */
        body {
            font-family: 'Cairo', sans-serif;
            background-color: var(--white);
            margin: 0;
            padding: 30px;
            box-sizing: border-box;
        }

        h3, h5, label {
            color: var(--dark-gray);
            font-weight: 600;
        }

        .form-section {
            margin-bottom: 20px;
        }

        /* ---------------------------------------------------
           3. Header Styles
        ---------------------------------------------------- */
        .header {
            padding: 20px 30px;
            background-color: var(--dark-gray);
            border-radius: 8px;
            text-align: center;
            margin-bottom: 30px;
            color: var(--white);
            font-size: 24px;
            font-weight: bold;
        }

        /* ---------------------------------------------------
           4. Welcome Section
        ---------------------------------------------------- */
        .welcome-section {
            background-color: #ffffff;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            margin-bottom: 30px;
        }

        .welcome-section h3 {
            font-size: 20px;
            color: var(--dark-gray);
            margin-bottom: 10px;
        }

        .welcome-section hr {
            width: 50px;
            height: 3px;
            background-color: var(--divider-color);
            border: none;
            margin: 10px auto 0;
        }

        /* ---------------------------------------------------
           5. Form Container Styles
        ---------------------------------------------------- */
        .form-container {
            background-color: #ffffff;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            border-radius: 8px;
            padding: 30px;
            max-width: 900px;
            margin: auto;
        }

        .form-container h3 {
            text-align: center;
            margin-bottom: 20px;
            color: var(--soft-brown);
        }

        /* ---------------------------------------------------
           6. Form Styles
        ---------------------------------------------------- */
        .form-control {
            border-radius: 8px;
            border: 1px solid #ccc;
            background-color: var(--light-gray);
            padding: 12px 15px;
            transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
            width: 100%;
            margin: 0 auto 15px auto;
            display: block;
        }

        .form-control:focus {
            border-color: var(--deep-brown);
            box-shadow: 0 0 5px rgba(142, 106, 81, 0.3);
            background-color: #ffffff;
        }

        .form-label {
            margin-bottom: 5px;
            font-size: 14px;
            display: block;
            text-align: left;
            width: 100%;
            margin: 0 auto 5px auto;
        }

        .add-product-button {
            background-color: var(--soft-brown);
            color: var(--white);
            border: none;
            padding: 8px 12px;
            border-radius: 5px;
            cursor: pointer;
            margin-top: 10px;
            transition: background-color var(--transition-speed);
        }

        .add-product-button:hover {
            background-color: var(--deep-brown);
        }

        .remove-product-button {
            background-color: #dc3545;
            color: var(--white);
            border: none;
            padding: 6px 10px;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color var(--transition-speed);
        }

        .remove-product-button:hover {
            background-color: #c82333;
        }

        /* ---------------------------------------------------
           7. Buttons Section
        ---------------------------------------------------- */
        .submit-button {
            width: 100%;
            height: 50px;
            font-size: 18px;
            font-weight: bold;
            border-radius: 8px;
            border: none;
            cursor: pointer;
            transition: transform var(--transition-speed), box-shadow var(--transition-speed);
            padding: 10px 20px;
            display: block;
            margin: 20px auto 0 auto;
            text-align: center;
            background-color: #FFD166;
            color: var(--white);
        }

        .submit-button:hover {
            background-color: #FFC043;
            transform: scale(1.02);
            box-shadow: 0 4px 6px var(--hover-shadow);
        }

        /* ---------------------------------------------------
           8. Alert Styles
        ---------------------------------------------------- */
        .alert-success {
            background-color: var(--success-color);
            color: var(--white);
            border-radius: 8px;
            padding: 15px 20px;
            margin-bottom: 20px;
            text-align: center;
            width: 100%;
            margin: 20px auto;
        }

        .alert-danger {
            background-color: var(--error-color);
            color: var(--white);
            border-radius: 8px;
            padding: 15px 20px;
            margin-bottom: 20px;
            text-align: center;
            width: 100%;
            margin: 20px auto;
        }

        /* ---------------------------------------------------
           9. Responsive Design Enhancements
        ---------------------------------------------------- */
        @media (max-width: 768px) {
            .form-control, .form-label, .submit-button, .alert-success, .alert-danger {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            .header {
                padding: 15px 20px;
                font-size: 20px;
            }

            .welcome-section h3 {
                font-size: 18px;
            }

            .form-control, .form-label, .submit-button, .alert-success, .alert-danger {
                width: 100%;
            }

            .submit-button {
                height: 50px;
                font-size: 16px;
            }
        }
    </style>

    <!-- Additional JavaScript for dynamic product addition -->
    <script>
        function addProductRow() {
            const productContainer = document.getElementById('products-container');
            const productCount = productContainer.children.length;

            const productRow = document.createElement('div');
            productRow.className = 'product-row border p-3 mb-3';
            productRow.innerHTML = `
                <div class="row">
                    <div class="col-md-5">
                        <label class="form-label" for="product_id_${productCount}">Product <span class="text-danger">*</span></label>
                        <select name="product_id[]" id="product_id_${productCount}" class="form-control" required>
                            <option value="">Select Product</option>
                            <?php
                            // Reset the products_result pointer
                            $products_result->data_seek(0);
                            while($product = $products_result->fetch_assoc()): ?>
                                <option value="<?= htmlspecialchars($product['id']) ?>">
                                    <?= htmlspecialchars($product['name'] . " - " . $product['size'] . " (" . number_format($product['price'], 2) . " KD)") ?>
                                </option>
                            <?php endwhile; ?>
                        </select>
                    </div>
                    <div class="col-md-3">
                        <label class="form-label" for="quantity_${productCount}">Quantity <span class="text-danger">*</span></label>
                        <input type="number" name="quantity[]" id="quantity_${productCount}" class="form-control" min="1" value="1" required>
                    </div>
                    <div class="col-md-3">
                        <label class="form-label" for="packaging_preferences_${productCount}">Packaging Preferences</label>
                        <input type="text" name="packaging_preferences[]" id="packaging_preferences_${productCount}" class="form-control" placeholder="e.g., Gift Wrap">
                    </div>
                    <div class="col-md-1 d-flex align-items-end">
                        <button type="button" class="remove-product-button" onclick="removeProductRow(this)">X</button>
                    </div>
                </div>
            `;
            productContainer.appendChild(productRow);
        }

        function removeProductRow(button) {
            const productRow = button.closest('.product-row');
            productRow.remove();
        }

        // Add initial product row on page load
        document.addEventListener('DOMContentLoaded', function() {
            if (document.getElementById('products-container').children.length === 0) {
                addProductRow();
            }
        });
    </script>

</head>
<body>

    <!-- Header is already included via header.php -->

    <!-- Welcome Section -->
    <div class="welcome-section mt-20">
        <h3>Welcome to the Kaak Alia Management System!</h3>
        <hr>
    </div>

    <!-- Form Container -->
    <div class="form-container">
        <h3>Add New Order</h3>
        <?php if ($success): ?>
            <div class="alert alert-success"><?= htmlspecialchars($success) ?></div>
            <!-- Audio Alert -->
        <?php endif; ?>
        <?php if ($error): ?>
            <div class="alert alert-danger"><?= htmlspecialchars($error) ?></div>
        <?php endif; ?>
        <form method="POST" action="">
            <!-- Customer Details -->
            <div class="form-section">
                <h5>Customer Details</h5>
                <label class="form-label" for="customer_name">Name <span class="text-danger">*</span></label>
                <input type="text" id="customer_name" name="customer_name" class="form-control" 
                       value="<?= isset($_POST['customer_name']) ? htmlspecialchars($_POST['customer_name']) : '' ?>" 
                       required>
                
                <label class="form-label" for="contact">Contact</label>
                <input type="text" id="contact" name="contact" class="form-control" 
                       value="<?= isset($_POST['contact']) ? htmlspecialchars($_POST['contact']) : '' ?>">
                
                <label class="form-label" for="delivery_address">Delivery Address</label>
                <textarea id="delivery_address" name="delivery_address" class="form-control"><?= isset($_POST['delivery_address']) ? htmlspecialchars($_POST['delivery_address']) : '' ?></textarea>
            </div>
            <hr>
            <!-- Order Details -->
            <div class="form-section">
                <h5>Order Details</h5>
                <div id="products-container">
                    <!-- Product Rows will be added here -->
                </div>
                <button type="button" class="add-product-button" onclick="addProductRow()">Add Another Product</button>
                
                <!-- Delivery DateTime Field -->
                <label class="form-label mt-3" for="delivery_datetime">Delivery Date and Time</label>
                <input type="datetime-local" id="delivery_datetime" name="delivery_datetime" class="form-control" 
                       value="<?= isset($_POST['delivery_datetime']) ? htmlspecialchars($_POST['delivery_datetime']) : '' ?>">
            </div>
            <!-- Submit Button -->
            <button type="submit" class="submit-button">Add Order</button>
        </form>
    </div>

    <!-- Footer -->
    <div class="footer text-center mt-10">
        &copy; 2024 Kaak Alia Bakery. All rights reserved.
    </div>

    <!-- Bootstrap JS Bundle -->
    <script src="/kaak_alia_management_system/assets/bootstrap/js/bootstrap.bundle.min.js"></script>
</body>
</html>) when i press on add order, it automatically go to (public/orders/view_orders.php)