cimpress-2

interface CouponType {
    type: "COUPON" | "PRODUCT"
    percentage: Number
    couponType: "ALL_ITEM" | "NEXT_ITEM" | "NTH_ITEM"
    order: Number
    category: String
}


interface ProductType {
    type: "COUPON" | "PRODUCT"
    price: Number
    category: String
    applicablePrice: Number
}

// [{coupon_type: all_item|nth_item, percentage, order: }]

/*
{
    all_item: [
        {percentage}
    ],
    nth_item: {
        category: {
            order: { percentage: }
        }
    }
}
*/

// {category: {order: 1, 2: {}, 1: {}, 2: {}}, currentOrder: 1}

class ShoppingCart {
    
    let items: ProductType | CouponType [];
    let coupons: CouponType[];
    let itemOrder = {};
    
    function addTime() {}
    
    function applyAllCoupon(item, itemOrder) {
        const coupons = this.coupons;
        let actualPrice = item.price;
        for (let i=0; i<coupons.length; ++i) {
            if (coupon.couponType === 'ALL_ITEM') {
                actualPrice -= (actualPrice*item.percentage)/100;
            } else {
                // else it will be of nth_item type
                if (item.category === coupon.category && itemOrder[item.category] !== undefined && itemOrder[item.category][coupon.order]) {
                    actualPrice -= (actualPrice*coupon.percentage)/100;
                }
            }
        }
        return actualPrice;
    }
    
    
    function findApplicablePrices() {
        const items = this.items;
        let cartTotal = 0;
        let itemOrder = {};

        for (let i=0; i< items.length; ++i) {
            const item = items[i];
            let itemApplicablePrice = item.price;
            if (item.type === "PRODUCT") {
                // apply all the applicable coupons
                itemApplicablePrice -= this.applyAllCoupons(item);
                
                // apply nth_item coupon
                if (i>0 && items[i-1].type === 'COUPON' and item.couponType === 'NEXT_ITEM') {
                    itemApplicablePrice -= (cartTotal*items[i-1].percentage)/100;
                }
                
                if (this.itemOrder[item.category] !== undefined) {
                    let currentOrder = this.itemOrder[item.category].[order] || 0 + 1;
                    this.itemOrder[item.category][currentOrder] = item
                }
                
                item.itemApplicablePrice = itemApplicablePrice;
            } else {
                this.coupons.push(item);
                if (item.couponType === 'ALL_ITEM') {
                    this.items.slice(0,i).forEach(item => {
                        item.applicablePrice -= (item.itemApplicablePrice*item.percentage)/100;
                    })
                } else if (item.couponType === 'NTH_ITEM') {
                
                    this.items.slice(0,i).forEach((item, index) => {
                          if (item.category === coupon.category && itemOrder[item.category] !== undefined && itemOrder[item.category][coupon.order]) {
                    item.applicablePrice -= (item.applicalePrice*coupon.percentage)/100;
                    }
                    })
                }
            }
            
        }
        
    }
}