UIKit/lib/utils/cart/cartDiscount.ts

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


export function findCartDiscount(
    cartPurchasesAmount: number,
    discounts: Discount[],
): Discount | null {
    const applicableDiscounts = discounts.filter(discount => {
        return (
            discount.Layer === 3 &&
            cartPurchasesAmount >= Number(discount.Condition.CartPurchasesAmount)
        );
    });

    if (!applicableDiscounts.length) return null;

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

    return maxValueDiscount;
}