@unchainedshop/plugins/lib/pricing/order-items-discount.js

Official plugin collection for the Unchained Engine with payment, delivery, and pricing adapters

import { ProductPricingSheet, OrderPricingDirector, OrderPricingAdapter, OrderPricingRowCategory, resolveRatioAndTaxDivisorForPricingSheet, } from '@unchainedshop/core';
import { calculation as calcUtils } from '@unchainedshop/utils';
export const OrderItemsDiscount = {
    ...OrderPricingAdapter,
    key: 'shop.unchained.pricing.order-items-discount',
    version: '1.0.0',
    label: 'Apply Discounts on Total Value Of Goods',
    orderIndex: 30,
    isActivatedFor: () => {
        return true;
    },
    actions: (params) => {
        const pricingAdapter = OrderPricingAdapter.actions(params);
        const { order, orderPositions } = params.context;
        return {
            ...pricingAdapter,
            calculate: async () => {
                const totalAmountOfItems = params.calculationSheet.total({
                    category: OrderPricingRowCategory.Items,
                    useNetPrice: false,
                }).amount;
                const itemShares = orderPositions.map((orderPosition) => resolveRatioAndTaxDivisorForPricingSheet(ProductPricingSheet({
                    calculation: orderPosition.calculation,
                    currencyCode: order.currencyCode,
                    quantity: orderPosition.quantity,
                }), totalAmountOfItems));
                let amountLeft = totalAmountOfItems;
                params.discounts.forEach(({ configuration, discountId }) => {
                    const leftInItemsToSplit = calcUtils.calculateAmountToSplit({ ...configuration }, totalAmountOfItems);
                    const [itemsDiscountAmount, itemsTaxAmount] = calcUtils.applyDiscountToMultipleShares(itemShares, Math.max(0, Math.min(amountLeft, leftInItemsToSplit)));
                    amountLeft -= itemsDiscountAmount;
                    const discountAmount = itemsDiscountAmount * -1;
                    const taxAmount = itemsTaxAmount * -1;
                    if (discountAmount) {
                        pricingAdapter.resultSheet().addDiscount({
                            amount: discountAmount,
                            taxAmount,
                            discountId,
                            meta: {
                                adapter: OrderItemsDiscount.key,
                            },
                        });
                    }
                });
                return pricingAdapter.calculate();
            },
        };
    },
};
OrderPricingDirector.registerAdapter(OrderItemsDiscount);