UIKit/lib/utils/cart/privilegeDiscount.ts

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


export function findPrivilegeDiscount(
    privilegeId: string,
    privilegePrice: number,
    discounts: Discount[],
    userId: string,
): Discount | null {
    const applicableDiscounts = discounts.filter(discount => {
        if (discount.Condition.User !== "" && discount.Condition.User === userId) return true;

        return (
            discount.Layer === 1 &&
            privilegeId === discount.Condition.Product &&
            privilegePrice >= Number(discount.Condition.Term)
        );
    });

    if (!applicableDiscounts.length) return null;

    let maxValueDiscount: Discount = applicableDiscounts[0];
    for (const discount of applicableDiscounts) {
        if (discount.Condition.User !== "" && discount.Condition.User === userId) {
            maxValueDiscount = discount;
            break;
        }

        if (Number(discount.Condition.Term) > Number(maxValueDiscount.Condition.Term)) {
            maxValueDiscount = discount;
        }
    }

    return maxValueDiscount;
}