JezK

Edit File: OrderTraits.php

<?php
/**
 * WC Admin Order Trait
 *
 * WC Admin Order Trait class that houses shared functionality across order and refund classes.
 */

namespace Automattic\WooCommerce\Admin\Overrides;

defined( 'ABSPATH' ) || exit;

/**
 * OrderTraits class.
 */
trait OrderTraits {
	/**
	 * Calculate shipping amount for line item/product as a total shipping amount ratio based on quantity.
	 *
	 * @param WC_Order_Item $item Line item from order.
	 *
	 * @return float|int
	 */
	public function get_item_shipping_amount( $item ) {
		// Shipping amount loosely based on woocommerce code in includes/admin/meta-boxes/views/html-order-item(s).php
		// distributed simply based on number of line items.
		$product_qty = $item->get_quantity( 'edit' );
		$order_items = $this->get_item_count();
		if ( 0 === $order_items ) {
			return 0;
		}

$total_shipping_amount = (float) $this->get_shipping_total();

return $total_shipping_amount / $order_items * $product_qty;
	}

/**
	 * Calculate shipping tax amount for line item/product as a total shipping tax amount ratio based on quantity.
	 *
	 * Loosely based on code in includes/admin/meta-boxes/views/html-order-item(s).php.
	 *
	 * @todo If WC is currently not tax enabled, but it was before (or vice versa), would this work correctly?
	 *
	 * @param WC_Order_Item $item Line item from order.
	 *
	 * @return float|int
	 */
	public function get_item_shipping_tax_amount( $item ) {
		$order_items = $this->get_item_count();
		if ( 0 === $order_items ) {
			return 0;
		}

$product_qty               = $item->get_quantity( 'edit' );
		$order_taxes               = $this->get_taxes();
		$line_items_shipping       = $this->get_items( 'shipping' );
		$total_shipping_tax_amount = 0;
		foreach ( $line_items_shipping as $item_id => $shipping_item ) {
			$tax_data = $shipping_item->get_taxes();
			if ( $tax_data ) {
				foreach ( $order_taxes as $tax_item ) {
					$tax_item_id                = $tax_item->get_rate_id();
					$tax_item_total             = isset( $tax_data['total'][ $tax_item_id ] ) ? (float) $tax_data['total'][ $tax_item_id ] : 0;
					$total_shipping_tax_amount += $tax_item_total;
				}
			}
		}
		return $total_shipping_tax_amount / $order_items * $product_qty;
	}

/**
	 * Calculates coupon amount for specified line item/product.
	 *
	 * Coupon calculation based on woocommerce code in includes/admin/meta-boxes/views/html-order-item.php.
	 *
	 * @param WC_Order_Item $item Line item from order.
	 *
	 * @return float
	 */
	public function get_item_coupon_amount( $item ) {
		return floatval( $item->get_subtotal( 'edit' ) - $item->get_total( 'edit' ) );
	}
}