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<?php
session_start();
include('dbcon.php');
if (!isset($_SESSION['session_id'])) {
$_SESSION['session_id'] = session_create_id();
}
if (isset($_POST['add_to_cart'])) {
$product_id = intval($_POST['product_id']);
$quantity = intval($_POST['quantity']);
$user_id = isset($_SESSION['id']) ? intval($_SESSION['id']) : 0;
$session_id = $_SESSION['session_id'];
if ($user_id > 0) {
$stmt = $conn->prepare("SELECT * FROM cart_items WHERE user_id = ? AND product_id = ?");
$stmt->bind_param("ii", $user_id, $product_id);
} else {
$stmt = $conn->prepare("SELECT * FROM cart_items WHERE session_id = ? AND product_id = ?");
$stmt->bind_param("si", $session_id, $product_id);
}
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
if ($user_id > 0) {
$stmt = $conn->prepare("UPDATE cart_items SET quantity = quantity + ? WHERE user_id = ? AND product_id = ?");
$stmt->bind_param("iii", $quantity, $user_id, $product_id);
} else {
$stmt = $conn->prepare("UPDATE cart_items SET quantity = quantity + ? WHERE session_id = ? AND product_id = ?");
$stmt->bind_param("isi", $quantity, $session_id, $product_id);
}
} else {
if ($user_id > 0) {
$stmt = $conn->prepare("INSERT INTO cart_items (user_id, product_id, quantity) VALUES (?, ?, ?)");
$stmt->bind_param("iii", $user_id, $product_id, $quantity);
} else {
$stmt = $conn->prepare("INSERT INTO cart_items (session_id, product_id, quantity) VALUES (?, ?, ?)");
$stmt->bind_param("ssi", $session_id, $product_id, $quantity);
}
}
if ($stmt->execute()) {
echo "<script> window.location.href = 'checkout.php';</script>";
} else {
echo "<script>alert('Error adding product to cart. Please try again.');</script>";
}
$stmt->close();
$conn->close();
}
?>