Add feature Loyalty discount

rambo-refactors/session-02/CalculatePrice/CalculatePrice.slnx

@@ -0,0 +1,3 @@
+<Solution>
+  <Project Path="CalculatePrice/CalculatePrice.csproj" />
+</Solution>

rambo-refactors/session-02/CalculatePrice/CalculatePrice/CalculatePrice.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

rambo-refactors/session-02/CalculatePrice/CalculatePrice/Program.cs

@@ -0,0 +1,108 @@
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        Console.WriteLine("Enter Base Price: must be more than 0");
+        decimal basePrice = decimal.Parse(Console.ReadLine()!);
+
+        Console.WriteLine("Enter Discount:");
+        decimal discount = decimal.Parse(Console.ReadLine()!);
+
+        Console.WriteLine("Enter Tax Ratio (example: 0.20):");
+        decimal taxRatio = decimal.Parse(Console.ReadLine()!);
+
+        Console.WriteLine("Is customer returning? (true/false):");
+        bool customerReturn = bool.Parse(Console.ReadLine()!);
+
+        // Precondition
+        if (basePrice < 0)
+            throw new ArgumentException("BasePrice must be non-negative");
+
+        var order = new Order(basePrice, discount);
+
+        var discountService = new DiscountService(order);
+
+        decimal priceAfterDiscount = discountService.CalculateDiscount(customerReturn);
+
+        var taxService = new TaxService();
+
+        var taxRequest = new CalculateTaxRequest(priceAfterDiscount, taxRatio);
+
+        decimal tax = taxService.CalculateTax(taxRequest);
+
+        decimal total = priceAfterDiscount + tax;
+
+        if (total < 0)
+            throw new Exception("Total cannot be less than zero");
+
+        Console.WriteLine("=================================");
+        Console.WriteLine($"Base Price: {basePrice}");
+        Console.WriteLine($"Discount: {discount}");
+        Console.WriteLine($"Price After Discount: {priceAfterDiscount}");
+        Console.WriteLine($"Tax: {tax}");
+        Console.WriteLine($"Final Total: {total}");
+    }
+}
+
+/* ======================= DOMAIN ======================= */
+
+public record CalculateTaxRequest(decimal BasePrice, decimal TaxRatio);
+
+public class TaxService
+{
+    //invariant condition
+    private const decimal MaxTax = 25M;
+    private const decimal MinimumPrice = 50M;
+
+    public decimal CalculateTax(CalculateTaxRequest request)
+    {
+        if (request.BasePrice < MinimumPrice)
+            return 0;
+
+        decimal taxableAmount = request.BasePrice ;
+        decimal tax = taxableAmount * request.TaxRatio;
+
+        if (tax > MaxTax)
+            tax = MaxTax;
+
+        return tax;
+    }
+}
+
+public class DiscountService
+{
+    //invariant condition
+    private const decimal LoyaltyDiscountRate = 0.05M;
+    private readonly Order _order;
+
+    public DiscountService(Order order)
+    {
+        _order = order;
+    }
+
+    public decimal CalculateDiscount(bool customerReturn)
+    {
+
+        if (customerReturn)
+            return _order.BasePrice - LoyaltyDiscount();
+
+        return _order.BasePrice - _order.Discount;
+    }
+
+    private decimal LoyaltyDiscount()
+    {
+        return _order.BasePrice * LoyaltyDiscountRate;
+    }
+}
+
+public class Order
+{
+    public decimal BasePrice { get; }
+    public decimal Discount { get; }
+
+    public Order(decimal basePrice, decimal discount)
+    {
+        BasePrice = basePrice;
+        Discount = discount;
+    }
+}

rambo-refactors/session-02/CalculatePrice/CalculatePrice/bin/Debug/net10.0/CalculatePrice.deps.json

@@ -0,0 +1,23 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v10.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v10.0": {
+      "CalculatePrice/1.0.0": {
+        "runtime": {
+          "CalculatePrice.dll": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "CalculatePrice/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}

rambo-refactors/session-02/CalculatePrice/CalculatePrice/bin/Debug/net10.0/CalculatePrice.runtimeconfig.json

@@ -0,0 +1,12 @@
+{
+  "runtimeOptions": {
+    "tfm": "net10.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "10.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}