order-item-striked-price.php

class AdpWcOrderEditExtensions
{
    public function __construct()
    {
    }

    public function register()
    {
        add_action('woocommerce_admin_order_item_values', [$this, "printRowItem"], 10, 3);
        add_action("woocommerce_admin_order_item_headers", [$this, "addHeader"], 10, 1);
    }

    public function addHeader()
    {
        printf('<th class="striked_subtotal" data-sort="float">%s</th>', __('Striked price', 'woocommerce'));
    }

    public function printRowItem($product, $item, $item_id)
    {
        if ($product === null) {
            return;
        }

        global $theorder;

        printf(
            '<td class="striked_subtotal" width="1%%"><div class="view">%s</div></td>',
            $this->orderItemFormatStrikedPrice($item, $theorder)
        );
    }

    /**
     * @param \WC_Order_Item_Product $item
     * @param \WC_Order $order
     * @return string
     */
    protected function orderItemFormatStrikedPrice($item, $order)
    {
        if (!$item->meta_exists('_wdp_initial_item_subtotal')) {
            return "";
        }

        $incTax = false;
        $qty = (float)$item->get_quantity();

        $result = wc_price($order->get_line_subtotal($item, $incTax) / $qty, array('currency' => $order->get_currency())
        );

        if ($order->get_prices_include_tax() && wc_tax_enabled()) {
            $initialSubtotalExclTax = (float)$item->get_meta('_wdp_initial_item_subtotal')
                - (float)$item->get_meta('_wdp_initial_item_subtotal_tax');
        } else {
            $initialSubtotalExclTax = (float)$item->get_meta('_wdp_initial_item_subtotal');
        }

        $initialSubtotalInclTax = $initialSubtotalExclTax + (float)$item->get_meta('_wdp_initial_item_subtotal_tax');

        $initialSubtotalExclTax = round($initialSubtotalExclTax, wc_get_price_decimals());
        $initialSubtotalInclTax = round($initialSubtotalInclTax, wc_get_price_decimals());

        if ($order->get_line_subtotal($item, $incTax) < $initialSubtotalExclTax) {
            if ($incTax) {
                $ex_tax_label = $order->get_prices_include_tax() ? 1 : 0;

                $initialSubtotalHtml = wc_price($initialSubtotalExclTax / $qty, array(
                    'ex_tax_label' => $ex_tax_label,
                    'currency' => $order->get_currency(),
                ));
            } else {
                $initialSubtotalHtml = wc_price(
                    $initialSubtotalInclTax / $qty,
                    array('currency' => $order->get_currency())
                );
            }

            $result = wc_format_sale_price($initialSubtotalHtml, $result);
        }

        return $result;
    }
}

(new AdpWcOrderEditExtensions())->register();