adminFront/src/utils/calcCart/calcCart.ts

import { CartData, Discount, PrivilegeCartData, Tariff, TariffCartData, applyCartDiscount, applyLoyaltyDiscount, applyPrivilegeDiscounts, applyServiceDiscounts } from "@frontend/kitui";


export function calcCart(
    tariffs: Tariff[],
    discounts: Discount[],
    purchasesAmount: number,
    coupon?: string,
): CartData {
    const cartData: CartData = {
        services: [],
        priceBeforeDiscounts: 0,
        priceAfterDiscounts: 0,
        itemCount: 0,
        appliedCartPurchasesDiscount: null,
        appliedLoyaltyDiscount: null,
        allAppliedDiscounts: [],
    };

    const serviceTariffType: Record<string, number> = {};

    tariffs.forEach(tariff => {
        let serviceData = cartData.services.find(service => service.serviceKey === tariff.privilegies[0].serviceKey);
        if (!serviceData) {
            serviceData = {
                serviceKey: tariff.privilegies[0].serviceKey,
                tariffs: [],
                price: 0,
                appliedServiceDiscount: null,
            };
            cartData.services.push(serviceData);
        }

        const tariffCartData: TariffCartData = {
            price: tariff.price ?? 0,
            isCustom: tariff.isCustom,
            privileges: [],
            id: tariff._id,
            name: tariff.name,
        };
        serviceData.tariffs.push(tariffCartData);

        tariff.privilegies.forEach(privilege => {
            serviceTariffType[privilege.serviceKey] ??= +tariff.isCustom;
            const isIncompatibleTariffs = serviceTariffType[privilege.serviceKey] ^ +tariff.isCustom;
            if (isIncompatibleTariffs) throw new Error("Если взят готовый тариф, то кастомный на этот сервис сделать уже нельзя");

            const privilegePrice = privilege.amount * privilege.price;

            if (!tariff.price) tariffCartData.price += privilegePrice;

            const privilegeCartData: PrivilegeCartData = {
                serviceKey: privilege.serviceKey,
                privilegeId: privilege.privilegeId,
                description: privilege.description,
                price: privilegePrice,
                appliedPrivilegeDiscount: null,
            };

            tariffCartData.privileges.push(privilegeCartData);
            cartData.priceAfterDiscounts += privilegePrice;
            cartData.itemCount++;
        });

        cartData.priceBeforeDiscounts += tariffCartData.price;
        serviceData.price += tariffCartData.price;
    });

    applyPrivilegeDiscounts(cartData, discounts);
    applyServiceDiscounts(cartData, discounts);
    applyCartDiscount(cartData, discounts);
    applyLoyaltyDiscount(cartData, discounts, purchasesAmount);

    cartData.allAppliedDiscounts = Array.from(new Set(cartData.allAppliedDiscounts));

    return cartData;
}

export function formatDiscountFactor(factor: number): string {
    return `${((1 - factor) * 100).toFixed(1)}%`;
}