UIKit/src/utils/cart/serviceDiscount.ts

import { CartData, Discount } from "../../model";


export function applyServiceDiscount(
    cartData: CartData,
    discounts: Discount[],
) {
    cartData.services.forEach(service => {
        service.privileges.forEach(privilege => {
            const privilegeDiscount = findServiceDiscount(privilege.serviceKey, privilege.price, discounts);
            if (privilegeDiscount) privilege.price *= privilegeDiscount.factor;
        });
    });
}

export function findServiceDiscount(
    serviceKey: string,
    currentPrice: number,
    discounts: Discount[],
): {
    discount: Discount | null,
    factor: number,
} {
    const applicableDiscounts = discounts.filter(discount => {
        return (
            discount.Layer === 2 &&
            discount.Condition.Group === serviceKey &&
            currentPrice >= discount.Condition.PriceFrom
        );
    });

    if (!applicableDiscounts.length) return { discount: null, factor: 1 };

    const maxValueDiscount = applicableDiscounts.reduce((prev, current) => {
        return current.Condition.PriceFrom > prev.Condition.PriceFrom ? current : prev;
    });

    return { discount: maxValueDiscount, factor: maxValueDiscount.Target.Factor };
}