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


export function applyLoyaltyDiscount(
    cartData: CartData,
    discounts: Discount[],
    purchasesAmount: number,
) {
    const loyalDiscount = findLoyaltyDiscount(purchasesAmount, discounts);
    if (!loyalDiscount) return;

    cartData.priceAfterDiscounts *= findDiscountFactor(loyalDiscount);
    cartData.allAppliedDiscounts.push(loyalDiscount);
    cartData.appliedLoyaltyDiscount = loyalDiscount;
}

export function findLoyaltyDiscount(
    purchasesAmount: number,
    discounts: Discount[],
): Discount | null {
    const applicableDiscounts = discounts.filter(discount => {
        return (
            discount.Layer === 4 &&
            discount.Condition.UserType !== "nko" &&
            purchasesAmount >= discount.Condition.PurchasesAmount
        );
    });

    if (!applicableDiscounts.length) return null;

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

    return maxValueDiscount;
}