static void Main(string[] args)
{
CartContext cart = new CartContext();
POS pos = new POS();
cart.PurchasedItems.AddRange(LoadProducts(@"..\..\..\products5.json"));
pos.ActivedRules.AddRange(LoadRules());
pos.CheckoutProcess(cart);
Console.WriteLine($"購買商品:");
Console.WriteLine($"---------------------------------------------------");
foreach (var p in cart.PurchasedItems)
{
Console.WriteLine($"- {p.Id,02}, [{p.SKU}] {p.Price,8:C}, {p.Name} {p.TagsValue}");
}
Console.WriteLine();
Console.WriteLine($"折扣:");
Console.WriteLine($"---------------------------------------------------");
foreach (var d in cart.AppliedDiscounts)
{
Console.WriteLine($"- 折抵 {d.Amount,8:C}, {d.Rule.Name} ({d.Rule.Note})");
foreach (var p in d.Products)
{
Console.WriteLine($" * 符合: {p.Id, 02}, [{p.SKU}], {p.Name} {p.TagsValue}");
}
Console.WriteLine();
}
Console.WriteLine();
Console.WriteLine($"---------------------------------------------------");
Console.WriteLine($"結帳金額: {cart.TotalPrice:C}");
}
private static void PrintReceipt(CartContext cart)
{
Console.WriteLine("購買商品：");
Console.WriteLine("---------------------------------------------------");
foreach (var p in cart.PurchasedItems)
{
Console.WriteLine($"- {p.Id,02}, [{p.Sku}] {p.Price,8:C}, {p.Name} {p.TagsValue}");
}
Console.WriteLine();
Console.WriteLine("折扣：");
Console.WriteLine("---------------------------------------------------");
foreach (var d in cart.AppliedDiscounts)
{
Console.WriteLine($"- 折抵 {d.Amount,8:C}, {d.Rule.Name} ({d.Rule.Note})");
foreach (var p in d.Products)
{
Console.WriteLine($" * 符合: {p.Id,02}, [{p.Sku}], {p.Name} {p.TagsValue}");
}
Console.WriteLine();
}
Console.WriteLine();
Console.WriteLine("---------------------------------------------------");
Console.WriteLine($"結帳金額： {cart.TotalPrice:C}");
}
public override IEnumerable <Discount> Process(CartContext cart)
{
foreach (var purchasedItem in cart.PurchasedItems.OrderByDescending(z => z.Price))
{
var matchOffer = _specialOffer.FirstOrDefault(m => m.Tags.Any(tag => purchasedItem.Tags.Contains(tag)));
foreach (var tag in purchasedItem.Tags)
{
if (matchOffer != null && matchOffer.ProductQueue.TryGetValue(tag, out var queue))
{
queue.Enqueue(purchasedItem);
if (matchOffer.ProductQueue.All(z => z.Value.Count > 0))
{
var products = matchOffer.ProductQueue.Select(x => x.Value.Dequeue()).ToList();
yield return(new Discount()
{
Amount = products.Sum(x => x.Price) - matchOffer.Amount,
Products = products.ToArray(),
Rule = this
});
}
}
}
}
}
public override IEnumerable <Discount> Process(CartContext cart)
{
List <Product> purchased_items = new List <Product>(cart.GetVisiblePurchasedItems(this.ExclusiveTag));
foreach (var d in this._discount_table)
{
var drinks = purchased_items.Where(p => p.Tags.Contains(d.drink)).OrderByDescending(p => p.Price).ToArray();
var foods = purchased_items.Where(p => p.Tags.Contains(d.food)).OrderByDescending(p => p.Price).ToArray();
if (drinks.Count() == 0)
{
continue;
}
if (foods.Count() == 0)
{
continue;
}
for (int i = 0; true; i++)
{
if (drinks.Length <= i)
{
break;
}
if (foods.Length <= i)
{
break;
}
if (purchased_items.Contains(drinks[i]) == false)
{
break;
}
if (purchased_items.Contains(foods[i]) == false)
{
break;
}
purchased_items.Remove(drinks[i]);
purchased_items.Remove(foods[i]);
yield return(new Discount()
{
Rule = this,
Products = new Product[] { drinks[i], foods[i] },
Amount = drinks[i].Price + foods[i].Price - d.price
});
}
}
}
public override IEnumerable <Discount> Process(CartContext cart)
{
if (cart.TotalPrice > this.MinDiscountPrice)
{
yield return new Discount()
{
Amount = this.DiscountAmount,
Rule = this,
Products = cart.PurchasedItems.ToArray()
}
}
;
}
}
public bool CheckoutProcess(CartContext cart)
{
// reset cart
cart.AppliedDiscounts.Clear();
cart.TotalPrice = cart.PurchasedItems.Select(p => p.Price).Sum();
foreach (var rule in this.ActivedRules)
{
var discounts = rule.Process(cart);
cart.AppliedDiscounts.AddRange(discounts);
cart.TotalPrice -= discounts.Select(d => d.Amount).Sum();
}
return(true);
}
public override IEnumerable <Discount> Process(CartContext cart)
{
List <Product> matched = new List <Product>();
foreach (var p in cart.GetVisiblePurchasedItems(this.ExclusiveTag).Where(p => p.Tags.Contains(this.TargetTag)).OrderByDescending(p => p.Price))
{
matched.Add(p);
if (matched.Count == 2)
{
yield return(new Discount()
{
Amount = matched.Sum(p => p.Price) * this.PercentOff / 100,
Products = matched.ToArray(),
Rule = this
});
matched.Clear();
}
}
}
private static void Main(string[] args)
{
// 購物車 Context。
var cart = new CartContext();
// POS。
var pos = new Pos();
// 購物車加入購買商品。
cart.PurchasedItems.AddRange(LoadProducts());
// POS 加入啟用的折扣規則。
pos.ActivatedRules.AddRange(LoadRules());
// 對購物車 Context 進行結帳。
pos.CheckoutProcess(cart);
// 列印收據。
PrintReceipt(cart);
Console.Read();
}
public override IEnumerable <Discount> Process(CartContext cart)
{
List <Product> matched = new List <Product>();
foreach (var p in cart.GetVisiblePurchasedItems(this.ExclusiveTag).Where(p => p.Tags.Contains(this.TargetTag)))
{
matched.Add(p);
if (matched.Count == this.MinCount)
{
yield return(new Discount()
{
Amount = this.DiscountAmount,
Products = matched.ToArray(),
Rule = this
});
matched.Clear();
}
}
}
public override IEnumerable <Discount> Process(CartContext cart)
{
List <Product> matched_products = new List <Product>();
foreach (var p in cart.GetVisiblePurchasedItems(this.ExclusiveTag))
{
matched_products.Add(p);
if (matched_products.Count == this.BoxCount)
{
// 符合折扣
yield return(new Discount()
{
Amount = matched_products.Select(p => p.Price).Sum() * this.PercentOff / 100,
Products = matched_products.ToArray(),
Rule = this,
});
matched_products.Clear();
}
}
}
public override IEnumerable <Discount> Process(CartContext cart)
{
List <Product> matched = new List <Product>();
foreach (var sku in cart.PurchasedItems.Where(p => p.Tags.Contains(this.TargetTag)).Select(p => p.SKU).Distinct())
{
matched.Clear();
foreach (var p in cart.PurchasedItems.Where(p => p.SKU == sku))
{
matched.Add(p);
if (matched.Count == 2)
{
yield return(new Discount()
{
Products = matched.ToArray(),
Amount = this.DiscountAmount,
Rule = this
});
matched.Clear();
}
}
}
}
public abstract IEnumerable <Discount> Process(CartContext cart);
