front-hub/src/utils/calcTariffPrices.ts

import { Discount, Tariff, findDiscountFactor } from "@frontend/kitui";
import { calcCart } from "./calcCart/calcCart";


export function calcIndividualTariffPrices(
    tariff: Tariff,
    discounts: Discount[],
    purchasesAmount: number,
    currentTariffs: Tariff[],
): {
    priceBeforeDiscounts: number;
    priceAfterDiscounts: number;
} {
    const priceBeforeDiscounts = tariff.price || tariff.privileges.reduce((sum, privilege) => sum + privilege.amount * privilege.price, 0);
    let priceAfterDiscounts = priceBeforeDiscounts;

    const cart = calcCart([...currentTariffs, tariff], discounts, purchasesAmount);

    cart.allAppliedDiscounts.forEach(discount => {
        priceAfterDiscounts *= findDiscountFactor(discount);
    });

    return { priceBeforeDiscounts, priceAfterDiscounts };
}