Insert and remove product automatically after certain quantity counts into cart - Cart - Woocommerce

Insert and remove product automatically after certain quantity counts into cart.php

<?

/*
 * Insert and remove product automatically after certain quantity counts into cart
 */
add_action( 'woocommerce_before_calculate_totals', 'add_remove_freebie', 50, 1 );
function add_remove_freebie( $cart ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;

    $freebie_id = 5902; // <== HERE set the freebie product ID
    $has_others = false;
	$quantity = 3; // quantity cart
    // Loop through cart items
    foreach( $cart->get_cart() as $cart_item_key => $cart_item ) {
        // Added Woocommerce compatibility version
        $product_id = version_compare( WC_VERSION, '3.0', '<' ) ? $cart_item['data']->id : $cart_item['data']->get_id();

        if( $product_id == $freebie_id ) {
            // Freebie is in cart
            $freebie_key = $cart_item_key;
        } else {
            // Other items are in cart
            $has_others = true;
        }
    }
    // If freebie product is alone in cart we remove it
    if( ! $has_others && isset( $freebie_key ) ){
        $cart->remove_cart_item( $freebie_key );
    } elseif ( $has_others && ! isset( $freebie_key ) && WC()->cart->get_cart_contents_count() >= $quantity ) {
        $cart->add_to_cart($freebie_id);
    }
	
	$product_cart_id = WC()->cart->generate_cart_id( $freebie_id );
    $in_cart = WC()->cart->find_product_in_cart( $product_cart_id );
  
   if ( $in_cart && WC()->cart->get_cart_contents_count() < $quantity ) {
   $cart->remove_cart_item( $in_cart );
     
   }
}


/**
 * Filters the reported number of cart items.
 * Counts only items NOT in certain category.
 *
 * @param  int  $count
 * @return int
 */
function so_43498002_cart_contents_count( $count ) {

    $cart_items = WC()->cart->get_cart();
    $subtract   = 0;

    foreach ( $cart_items as $key => $value ) {

        if ( has_term( 'omaggio', 'product_cat', $value['product_id'] ) ) {
            $count -= $value[ 'quantity' ];
        }
    }

    return $count;
}
add_filter( 'woocommerce_cart_contents_count',  'so_43498002_cart_contents_count' );