/**
 * Prevent Duplicate Orders in WooCommerce within One Hour.
 * Checks if the current user has placed an order with the same products or total amount in the last hour.
 */
add_action( 'woocommerce_checkout_process', 'wbcom_prevent_duplicate_order_within_one_hour' );

function wbcom_prevent_duplicate_order_within_one_hour() {
    $current_user = wp_get_current_user();
    $current_cart_items = WC()->cart->get_cart();
    $current_cart_total = WC()->cart->total;

    $args = array(
        'customer_id' => $current_user->ID,
        'date_created' => '>' . ( time() - HOUR_IN_SECONDS ),
        'status' => array( 'on-hold', 'processing', 'completed' ),
        'limit' => -1 // Retrieve all orders in the timeframe
    );

    $orders = wc_get_orders( $args );

    foreach ( $orders as $order ) {
        $order_items = $order->get_items();
        $order_total = $order->get_total();

        // Check if order total is the same
        if ( $current_cart_total == $order_total ) {
            wc_add_notice( 'An order with the same total amount has been placed in the last hour. Please wait before placing a new order.', 'error' );
            return;
        }

        // Check if cart contains the same products
        if ( wbcom_check_same_products( $current_cart_items, $order_items ) ) {
            wc_add_notice( 'An order with the same products has been placed in the last hour. Please wait before placing a new order.', 'error' );
            return;
        }
    }
}

function wbcom_check_same_products( $current_cart_items, $order_items ) {
    $cart_product_ids = array_keys( wp_list_pluck( $current_cart_items, 'product_id' ) );
    $order_product_ids = array_keys( wp_list_pluck( $order_items, 'product_id' ) );

    sort( $cart_product_ids );
    sort( $order_product_ids );

    return $cart_product_ids === $order_product_ids;
}