// Side effect free function
public BasketPricingBreakdown calculate_total_price_for(Guid basket_id)
{
var basketPricingBreakdown = new BasketPricingBreakdown();
var basket = _basketRepository.find_by(basket_id);
var basket_discount = new Money();
var coupon_issue = CouponIssues.NotApplied;
if (basket.has_had_coupon_applied())
{
var coupon = _offerRepository.find_by(basket.coupon_id);
if (coupon.is_still_active() && coupon.can_be_applied_to(basket))
{
basket_discount = coupon.calculate_discount_for(basket);
coupon_issue = CouponIssues.NoIssue;
}
else
{
coupon_issue = coupon.reason_why_cannot_be_applied_to(basket);
}
}
basketPricingBreakdown.basket_total = basket.items_total;
basketPricingBreakdown.discount = basket_discount;
basketPricingBreakdown.coupon_message = coupon_issue;
return basketPricingBreakdown;
}
public BasketItem(Product product, NonNegativeQuantity quantity)
{
_id = Guid.NewGuid();
_price = product.price;
_product_id = product.id;
_quantity = quantity;
}
// Side effect free function
public BasketPricingBreakdown calculate_total_price_for(IEnumerable<BasketItem> items, IEnumerable<Coupon> coupons)
{
var basketPricingBreakdown = new BasketPricingBreakdown();
var basket_discount = new Money();
var coupon_issue = CouponIssues.NotApplied;
//foreach (var coupon in coupons)
//{
// // 1. Get all coupons associted with the basket
// // 2. Check if it is applicable or which one wins.
// var promotion = _promotions_repository.find_by(coupon.code);
// if (promotion.is_still_active() && promotion.can_be_applied_to(basket))
// {
// basket_discount = promotion.calculate_discount_for(items);
// coupon_issue = CouponIssues.NoIssue;
// }
// else
// {
// coupon_issue = coupon.reason_why_cannot_be_applied_to(items);
// }
//}
var total = new Money();
foreach(var item in items)
{
total = total.add(item.line_total());
}
basketPricingBreakdown.basket_total = total;
basketPricingBreakdown.discount = basket_discount;
basketPricingBreakdown.coupon_message = coupon_issue;
return basketPricingBreakdown;
}
public Promotion(string voucher_code, Money discount, Money threshold)
{
// TODO: Check for null values and invalid data
_voucher_code = voucher_code;
_discount = discount;
_threshold = threshold;
}
public Product(int id, string name, Money price, string category)
{
// TODO: Check for null values and invalid data
_id = id;
_name = name;
_price = price;
_category = category;
}
public BasketVoucher(Guid basket_id, string voucher_code, Money discount, Money threshold)
{
_id = Guid.NewGuid();
_basket_id = basket_id;
_voucher_code = voucher_code;
_discount = discount;
_threshold = threshold;
}
public Offer(string voucher_code, Money discount, Money threshold)
: this()
{
// TODO: Check for null values and invalid data
_voucher_code = voucher_code;
_discount = discount;
_threshold = threshold;
}
public Money calculate_discount_for(Basket basket)
{
var discount = new Money();
if (this.meets_criteria_for_discount(basket))
{
discount = discount.add(_discount);
}
else
{
determine_why_not_applicable_for(basket); // This sets why the voucher is not applicable
}
return discount;
}
private Money calculate_cost_with_discount_of(Money discount)
{
return items_total.minus(discount);
}
private Money caclulate_basket_discount()
{
Money _discount = new Money();
if (_basket_voucher != null)
_discount = _basket_voucher.calculate_discount_for(this);
return _discount;
}
public BasketPriceChanged(Guid basket_id, Money cost_of_basket)
{
this.basket_id = basket_id;
CostOfBasket = cost_of_basket;
}
public BasketPriceChanged(Guid basket_id, Money cost_of_basket, Money discount)
{
this.basket_id = basket_id;
CostOfBasket = cost_of_basket;
Discount = discount;
}
public BasketCreated(Guid id, Money amountToPay)
{
Id = id;
AmountToPay = amountToPay;
}