<?php
session_start();
// if(!isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] !== true){
//     $_SESSION['return_to'] = $_SERVER['REQUEST_URI'];
//     header("location: login.php");
//     exit;
// }
require_once 'config.php';

// Get the product ID and quantity from the form submission
$id = $_POST['id'];
$quantity = $_POST['quantity'];

// Check if the product is already in the cart
if(isset($_SESSION['cart'][$id])) {
    // If it is, update the quantity
    $_SESSION['cart'][$id]['quantity'] += $quantity;
} else {
    // If it isn't, add the product to the cart
    $query = "SELECT * FROM products WHERE id = '$id'";
    $result = mysqli_query($con, $query);  
    $row = mysqli_fetch_array($result, MYSQLI_ASSOC);

    $_SESSION['cart'][$id] = [
        'id' => $row['id'],
        'name' => $row['product_title'],
        'price' => $row['product_price'],
        'image' => $row['product_img'],
        'quantity' => $quantity
    ];

}

// Calculate the cart total
$_SESSION['cart_total'] = 0;
foreach($_SESSION['cart'] as $product) {
    $_SESSION['cart_total'] += $product['price'] * $product['quantity'];
}
header("location: shop.php");
?>