private double ApplyStrategy(IPromotionStrategy strategy, Item item)
{
switch (item.ItemID)
{
case "A":
_discountQuantity = 3;
_price
= _price
+ ((item.UnitPrice * item.OrderItems)
- ((item.OrderItems / _discountQuantity) * strategy.GetPromotionDiscount()));
break;
case "B":
_discountQuantity = 2;
_price
= _price
+ ((item.UnitPrice * item.OrderItems)
- ((item.OrderItems / _discountQuantity) * strategy.GetPromotionDiscount()));
break;
case "C":
case "D":
_price = _price + ((item.UnitPrice * item.OrderItems));
break;
case "CD":
_discountQuantity = item.OrderItems;
_price = _price - (_discountQuantity * strategy.GetPromotionDiscount());
break;
}
return(_price);
}
public void Setup()
{
_promotionStrategy = new ComboOffer();
_productWithoutOffer = new List <ProductCheckout>()
{
new ProductCheckout()
{
ProductCode = "C", Quantity = 1, DefaultPrice = 20
}
};
_productWithOffer = new List <ProductCheckout>()
{
new ProductCheckout()
{
ProductCode = "C", Quantity = 1, DefaultPrice = 20
}, new ProductCheckout()
{
ProductCode = "D", Quantity = 1, DefaultPrice = 15
}
};
_promotions = new List <Promotion>()
{
new Promotion()
{
Type = "Single", ProductCode = "A", Price = 130, Quantity = 3
}, new Promotion()
{
Type = "Single", ProductCode = "B", Price = 45, Quantity = 2
}, new Promotion()
{
Type = "Combo", ProductCode = "C;D", Price = 30, Quantity = 3
}
};
}
public void Setup()
{
_promotionStrategy = new AdditionalItemOffer();
_productWithOffer = new ProductCheckout()
{
ProductCode = "A", Quantity = 3, DefaultPrice = 50
};
_productWithOfferExtra = new ProductCheckout()
{
ProductCode = "A", Quantity = 4, DefaultPrice = 50
};
_productWithoutOffer = new ProductCheckout()
{
ProductCode = "A", Quantity = 2, DefaultPrice = 50
};
_promotions = new List <Promotion>()
{
new Promotion()
{
Type = "Single", ProductCode = "A", Price = 130, Quantity = 3
}, new Promotion()
{
Type = "Single", ProductCode = "B", Price = 45, Quantity = 2
}, new Promotion()
{
Type = "Combo", ProductCode = "C;D", Price = 30, Quantity = 3
}
};
}
public void GetQuntityStrategyResultForOneItem()
{
var cartList = new List <CartWithPromotionType>();
cartList.Add(new CartWithPromotionType()
{
cart = new Cart()
{
Quantity = 1,
SkuId = 'A'
},
promotionType = PromotionTypes.Quantity
});
promotionStrategy = new QuantityPromotion(query);
var result = promotionStrategy.ApplyPromotion(cartList);
Assert.AreEqual(50, result);
}
public void GetComboStrategyResultOnlyFirtOfCombo()
{
var cartList = new List <CartWithPromotionType>();
cartList.Add(new CartWithPromotionType()
{
cart = new Cart()
{
Quantity = 1,
SkuId = 'C'
},
promotionType = PromotionTypes.Combo
});
promotionStrategy = new ComboPromotion(query);
var result = promotionStrategy.ApplyPromotion(cartList);
Assert.AreEqual(20, result);
}
public override decimal CalculateSumPrice(Guid?couponId)
{
decimal price = 0;
List <ShopCartItem> items = new List <ShopCartItem>(); //todo:: 从数据源获取购物车items
foreach (var item in items)
{
//计算每一项购物车item的价格
var isChecked = true; //todo::检查是否选中状态的购物车项
if (isChecked)
{
PromotionType type = PromotionType.NonePromotion; //todo:: 从item中获取促销类型
Guid itemId = Guid.Empty; //todo:: 从item中获取id
IPromotionStrategy strategy = PromotionStrategyCreater.Factory(type);
price += strategy.CalculatePromotionPrice(itemId);
}
}
return(price);
}
public double GetCheckoutPrice()
{
Item itemCD = new Item();
int countC = 0;
int countD = 0;
int countCD = 0;
IPromotionStrategy strategy = null;
double finalprice = 0;
foreach (Item item in _items)
{
if (item.ItemID == "C")
{
countC = countC + item.OrderItems;
}
if (item.ItemID == "D")
{
countD = countD + item.OrderItems;
}
strategy = this.GetStrategy(item.OrderItems, item.ItemID);
finalprice = this.ApplyStrategy(strategy, item);
}
//Special logic for C & D
if (countC > 0 && countD > 0)
{
countCD = (countC > countD) ? countD : countC;
itemCD = new Item()
{
ItemID = "CD", UnitPrice = 35, OrderItems = countCD
};
strategy = this.GetStrategy(itemCD.OrderItems, itemCD.ItemID);
finalprice = this.ApplyStrategy(strategy, itemCD);
}
return(finalprice);
}
public PromotionContext(IPromotionStrategy promotionStrategy)
{
_promotionStrategy = promotionStrategy;
}
public void SetStrategy(IPromotionStrategy promotionStrategy)
{
_promotionStrategy = promotionStrategy;
}
public PromotionEngine(Dictionary <SKU, double> priceList, IPromotionStrategy promotionStrategy)
{
_priceList = priceList;
this._promotionStrategy = promotionStrategy;
}