Feature repricing min max (#10)

amazon settlement import/export improvements

src/bnhtrade.Core/Logic/Account/TaxCalculation.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace bnhtrade.Core.Logic.Account
+{
+    public class TaxCalculation
+    {
+        public decimal GetGrossAmount(decimal netAmount, decimal taxPercent)
+        {
+            return netAmount * (1 + (taxPercent / 100));
+        }
+
+        public decimal GetGrossAmount(decimal netAmount, Model.Account.TaxCodeInfo taxCodeInfo)
+        {
+            return GetGrossAmount(netAmount, taxCodeInfo.TaxRate);
+        }
+
+        public decimal GetNetAmount(decimal grossAmount, decimal taxPercent)
+        {
+            return grossAmount / (1 + (taxPercent / 100));
+        }
+
+        public decimal GetNetAmount(decimal grossAmount, Model.Account.TaxCodeInfo taxCodeInfo)
+        {
+            return GetNetAmount(grossAmount, taxCodeInfo.TaxRate);
+        }
+
+        public decimal GetTaxAmount(decimal amount, bool amountIsTaxInclusive, decimal taxPercent)
+        {
+            if (amountIsTaxInclusive)
+            {
+                return amount - GetNetAmount(amount, taxPercent);
+            }
+            else
+            {
+                return amount * (taxPercent / 100);
+            }
+        }
+
+        public decimal GetTaxAmount(decimal amount, bool amountIsTaxInclusive, Model.Account.TaxCodeInfo taxCodeInfo)
+        {
+            return GetTaxAmount(amount, amountIsTaxInclusive, taxCodeInfo.TaxRate);
+        }
+
+        public decimal GetMarginTaxRate(DateTime transactionDate)
+        {
+            decimal vatRate = 0;
+            if (transactionDate >= new DateTime(2011, 01, 04))
+            {
+                vatRate = 20;
+            }
+            else
+            {
+                // more coding required
+                throw new Exception("Transaction is outside the current margin scheme date scope");
+            }
+            return vatRate;
+        }
+
+        public decimal GetMarginTaxAmount(decimal marginAmount, DateTime transactionDate)
+        {
+            decimal vatRate = GetMarginTaxRate(transactionDate);
+
+            return GetTaxAmount(marginAmount, true, vatRate);
+        }
+
+        public decimal GetMarginTaxAmount(decimal purchasePrice, decimal salePrice, DateTime transactionDate)
+        {
+            return GetMarginTaxAmount(salePrice - purchasePrice, transactionDate);
+        }
+
+        /// <summary>
+        /// Returns a value to multiply margin (sale - purchase price) by to find margin scheme tax amount
+        /// </summary>
+        /// <param name="transactionDate">Date of transaction</param>
+        /// <returns>Value between 0 and 1</returns>
+        public decimal GetMarginMultiplier(DateTime transactionDate)
+        {
+            decimal vatRate = GetMarginTaxRate(transactionDate);
+            return vatRate / (vatRate + 100);
+        }
+    }
+}