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

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

import { OrderPricingRowCategory, OrderPricingDirector, OrderPricingAdapter, DeliveryPricingSheet, PaymentPricingSheet, ProductPricingSheet, resolveRatioAndTaxDivisorForPricingSheet, } from '@unchainedshop/core';
import { calculation as calcUtils } from '@unchainedshop/utils';
export const OrderDiscount = {
    ...OrderPricingAdapter,
    key: 'shop.unchained.pricing.order-discount',
    version: '1.0.0',
    label: 'Apply Discounts on Total Order Value',
    orderIndex: 40,
    isActivatedFor: () => {
        return true;
    },
    actions: (params) => {
        const pricingAdapter = OrderPricingAdapter.actions(params);
        const { order, orderDelivery, orderPositions, orderPayment } = params.context;
        return {
            ...pricingAdapter,
            calculate: async () => {
                if (!order)
                    return pricingAdapter.calculate();
                const totalAmountOfItems = params.calculationSheet.total({
                    category: OrderPricingRowCategory.Items,
                    useNetPrice: false,
                }).amount;
                const totalAmountOfPaymentAndDelivery = params.calculationSheet.total({
                    category: OrderPricingRowCategory.Payment,
                    useNetPrice: false,
                }).amount +
                    params.calculationSheet.total({
                        category: OrderPricingRowCategory.Delivery,
                        useNetPrice: false,
                    }).amount;
                const itemShares = orderPositions.map((orderPosition) => resolveRatioAndTaxDivisorForPricingSheet(ProductPricingSheet({
                    calculation: orderPosition.calculation,
                    currencyCode: order.currencyCode,
                    quantity: orderPosition.quantity,
                }), totalAmountOfItems));
                const deliveryShare = resolveRatioAndTaxDivisorForPricingSheet(DeliveryPricingSheet({
                    calculation: orderDelivery?.calculation || [],
                    currencyCode: order.currencyCode,
                }), totalAmountOfPaymentAndDelivery);
                const paymentShare = resolveRatioAndTaxDivisorForPricingSheet(PaymentPricingSheet({
                    calculation: orderPayment?.calculation || [],
                    currencyCode: order.currencyCode,
                }), totalAmountOfPaymentAndDelivery);
                let amountLeft = totalAmountOfPaymentAndDelivery + totalAmountOfItems;
                params.discounts.forEach(({ configuration, discountId }) => {
                    const leftInDiscountToSplit = calcUtils.calculateAmountToSplit({ ...configuration }, Math.min(totalAmountOfItems, amountLeft));
                    const [itemsDiscountAmount, itemsTaxAmount] = calcUtils.applyDiscountToMultipleShares(itemShares, Math.max(0, Math.min(amountLeft, leftInDiscountToSplit)));
                    amountLeft -= itemsDiscountAmount;
                    const fixedRate = Number(configuration.fixedRate) > 0
                        ? Math.max(0, configuration.fixedRate - itemsDiscountAmount)
                        : undefined;
                    const leftInFeesToSplit = calcUtils.calculateAmountToSplit({ ...configuration, fixedRate }, Math.min(totalAmountOfPaymentAndDelivery, amountLeft));
                    const [deliveryAndPaymentDiscountAmount, deliveryAndPaymentTaxAmount] = calcUtils.applyDiscountToMultipleShares([deliveryShare, paymentShare], Math.max(0, Math.min(amountLeft, leftInFeesToSplit)));
                    amountLeft -= deliveryAndPaymentDiscountAmount;
                    const discountAmount = (itemsDiscountAmount + deliveryAndPaymentDiscountAmount) * -1;
                    const taxAmount = (itemsTaxAmount + deliveryAndPaymentTaxAmount) * -1;
                    if (discountAmount) {
                        pricingAdapter.resultSheet().addDiscount({
                            amount: discountAmount,
                            taxAmount,
                            discountId,
                            meta: {
                                adapter: OrderDiscount.key,
                            },
                        });
                    }
                });
                return pricingAdapter.calculate();
            },
        };
    },
};
OrderPricingDirector.registerAdapter(OrderDiscount);