Code-Snippets-Functions/Execute a function on a child site/WooCommerce/cart-item-price-based-on-quantity-discount-for-a-category.txt

// Utility function: Get specific category discount based on quantity
function get_category_custom_discount( $cart, $category ) {
    $calculated_qty = 0; // Initializing

    foreach( $cart->get_cart() as $cart_item ) {
        if( has_term( $category, 'product_cat', $cart_item['product_id'] ) ) {
            $calculated_qty   += $cart_item["quantity"]; 
        }
    }

    if ( $calculated_qty >= 200 ) {
        return 1.5;
    } else if( $calculated_qty >= 100 ) {
        return 1;
    } else {
        return 0;
    }
}

// Change cart item price
add_action( 'woocommerce_before_calculate_totals', 'category_ferns_set_bulk_discount', 20, 1 );
function category_ferns_set_bulk_discount( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $category = 'ferns';
    $discount = get_category_custom_discount( $cart, $category );

    if ( $discount > 0 ) {
        foreach($cart->get_cart() as $cart_item) {
            if( has_term($category, 'product_cat', $cart_item['product_id']) ) {
                $cart_item['data']->set_price( $cart_item['data']->get_price() - $discount );
            }
        }
    }
}

// Handle mini cart displayed price
add_action( 'woocommerce_cart_item_price', 'category_ferns_display_bulk_discount', 20, 2 );
function category_ferns_display_bulk_discount( $price_html, $cart_item ) {
    $cart     = WC()->cart;
    $category = 'ferns';
    $discount = get_category_custom_discount( $cart, $category );

    if( $discount > 0 && has_term($category, 'product_cat', $cart_item['product_id']) ) {
        $args = array( 'price' => floatval( $cart_item['data']->get_price() - $discount ) ); 

        if ( $cart->display_prices_including_tax() ) {
            $product_price = wc_get_price_including_tax( $cart_item['data'], $args );
        } else {
            $product_price = wc_get_price_excluding_tax( $cart_item['data'], $args );
        }
        return wc_price( $product_price );
    }
    return $price_html;
}