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WooCommerce: Double discount on sale products with coupon

Time:11-22

I want to double the discount for products on sale with a coupon code.

For example: The product is on sale with a 10% discount. If I add the coupon code doublediscount I want to double that discount to 20%.

The coupon discount should have limit of 15%. So if a product is on sale with a 30% discount, the max added discount with the coupon code should be 15%. Resulting in a 45% discount on the regular price (sale extra discount).

My code so far is this:

add_action( 'woocommerce_before_calculate_totals', 'double_saleprice_coupon' );
function double_saleprice_coupon( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    global $woocommerce;
    $coupon_id = 'doublediscount';

    // Loop through cart items (first loop)
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ){

        // Check if product in cart is on sale
        $product = $cart_item['data'];
        $cart_item_regular_price = $cart_item['data']->get_regular_price();
        $cart_item_sale_price = $cart_item['data']->get_sale_price();
        $cart_item_diff       = $cart_item_regular_price - $cart_item_sale_price;
        $cart_item_per_cent   = round( $cart_item_diff / $cart_item_regular_price * 100, 0 );

        if ( $product->is_on_sale() && wc_pb_is_bundled_cart_item($cart_item) === false && $cart_item_per_cent < 15 ) {
            echo 'on sale';
            echo $cart_item_per_cent;
        }

    }
}

I loop through all cart items and check if they are on sale and if the discount is below 15%. If that's the case, I want to change the discount for these cart items.

If the cart item has a discount above 15% I don't want to do anything. So the coupon code doublediscount would apply 15% to them.

I just don't know how to add/change the discount of a cart item.

CodePudding user response:

You can use the woocommerce_coupon_get_discount_amount hook instead in combination with the following coupon settings:

  • Set correctly your coupon code: doublediscount
  • Discount type: Percentage
  • Amount: 15

Steps applied in this answer:

  • Only if the specific coupon code matches and the product is on sale
  • If a product is not on sale, no discount will be applied (by the else condition equal to 0. However, if this doesn't apply, you can simply remove the else condition)
  • Current percentage discount of the on sale product is calculated. If this is less than the maximum added discount (15), then the discount is doubled
  • If this is more, the maximum discount added (15) will be applied automatically

So you get:

function filter_woocommerce_coupon_get_discount_amount( $discount, $price_to_discount , $cart_item, $single, $coupon ) {    
    // Only apply for this coupon
    if ( $coupon->get_code() == 'doublediscount' ) {
        // On sale
        if ( $cart_item['data']->is_on_sale() ) {
            // Regular price
            $cart_item_regular_price = $cart_item['data']->get_regular_price();
            
            // Sale price
            $cart_item_sale_price = $cart_item['data']->get_sale_price();
            
            // Calculate the percentage difference
            $cart_item_diff = $cart_item_regular_price - $cart_item_sale_price;
            $cart_item_percentage = round( $cart_item_diff / $cart_item_regular_price * 100, 0 );
            
            // Get maximum added discount
            $max_added_discount = $coupon->get_amount();
            
            // Less than maximum added discount
            if ( $cart_item_percentage < $max_added_discount ) {
                $discount = round( ( $price_to_discount * $cart_item_percentage ) / 100, 0 );
            }
        } else {
            $discount = 0;
        }
    }

    return $discount;
}
add_filter( 'woocommerce_coupon_get_discount_amount', 'filter_woocommerce_coupon_get_discount_amount', 10, 5 );
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