Prevents the Addition of A Product if There Is a Specific Product in The cart, While Emptying the Basket Leaving the Specific Product if It Is Added - Woocommerce

prevents-the-addition-of-a-product-if-there-is-a-specific-product-in-the-cart-while-emptying-the-basket-leaving-the-specific-product-if-it-is-added-woocommerce.php

<?php

// Funzione che controlla se nel carrello c'è un prodotto specifico
add_filter( 'woocommerce_add_to_cart_validation', 'prevent_product_add_to_cart', 10, 3 );

function prevent_product_add_to_cart( $passed, $product_id, $quantity ) {
    // set the product IDs that will prevent the addition of new products
    $restricted_products = array( 1291 );

    // check if any of the restricted products are already in the cart
    foreach( WC()->cart->get_cart() as $cart_item ) {
        if( in_array( $cart_item['product_id'], $restricted_products ) ) {
            // if a restricted product is in the cart, do not allow new products to be added
            wc_add_notice( __( 'Poichè nel tuo carrello esiste il pacchetto completo dei corsi, non sarà possibile procedere.', 'woocommerce' ), 'error' );
            return false;
        }
    }

    // if a restricted product is not already in the cart, allow new products to be added
    return $passed;
}

add_action( 'woocommerce_add_to_cart', 'check_for_restricted_products_in_cart' );


// Funzione che previene l'aggiunta di un prodotto se nel carrello c'è un prodotto specifico

function check_for_restricted_products_in_cart() {
    // set the product ID that will trigger the removal of all non-restricted products from the cart
    $restricted_product = 1291;

    // check if the restricted product is in the cart
    $restricted_product_in_cart = false;
    foreach( WC()->cart->get_cart() as $cart_item ) {
        if( $cart_item['product_id'] == $restricted_product ) {
            $restricted_product_in_cart = true;
            break;
        }
    }

    // if the restricted product is in the cart, remove all non-restricted products and show a notice
    if( $restricted_product_in_cart ) {
        foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
            if( ! in_array( $cart_item['product_id'], array( $restricted_product ) ) ) {
                WC()->cart->remove_cart_item( $cart_item_key );
            }
        }
        wc_add_notice( __( 'I corsi singoli sono stati rimossi dal carrello.', 'woocommerce' ), 'notice' );
    }
}