add check for zero value in columns

EvoCalculator.Core.Calculation/CheckTools.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace EvoCalculator.Core.Calculation
+{
+    public class CheckTools<T>
+    {
+        private string ErrorZeroValue =
+            "Невозможно осуществить расчет графика. При заданных параметрах получаются отрицательные значения";
+
+        public void CheckColumnForZeroValue(IEnumerable<decimal> Values)
+        {
+            if (Values.Skip(1).ToList().Exists(x => x < 0))
+            {
+                throw new Exception(ErrorZeroValue);
+            }
+        }
+
+        public void CheckColumnForZeroValue(IEnumerable<double> Values)
+        {
+            if (Values.Skip(1).ToList().Exists(x => x <= 0))
+            {
+                throw new Exception(ErrorZeroValue);
+            }
+        }
+    }
+}

EvoCalculator.Core.Calculation/Columns/GPS_GrColumn.cs

@@ -8,11 +8,18 @@ namespace EvoCalculator.Core.Calculation.Columns
         {
         }
 
+        private void PostCheck()
+        {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+        }
+
         public void ComputeValues(PreparedPayments preparedPayments, PreparedValues preparedValues)
         {
             for (var i = 1; i < Values.Length; i++) Values[i] = preparedPayments.Rows[i - 1].GpsCostPayment;
 
             Values[0] = -XNPV;
+            
+            PostCheck();
         }
     }
 }

EvoCalculator.Core.Calculation/Columns/KaskoNmperGrColumn.cs

@@ -8,6 +8,11 @@ namespace EvoCalculator.Core.Calculation.Columns
             rate)
         {
         }
+        
+        private void PostCheck()
+        {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+        }
 
         public void ComputeValues(PreparedValues preparedValues, Constants.Calculation constants)
         {
@@ -29,6 +34,8 @@ namespace EvoCalculator.Core.Calculation.Columns
 
 
             Values[0] = -XNPV;
+            
+            PostCheck();
         }
     }
 }

EvoCalculator.Core.Calculation/Columns/SumColumn.cs

@@ -39,6 +39,8 @@ namespace EvoCalculator.Core.Calculation.Columns
 
         private void PostCheck()
         {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+
             if (Values[1] / Values.Skip(1).Sum() >= 0.5m)
             {
                 throw new Exception(

EvoCalculator.Core.Calculation/Columns/SumRepaymentColumn.cs

@@ -8,6 +8,11 @@ namespace EvoCalculator.Core.Calculation.Columns
         {
         }
 
+        private void PostCheck()
+        {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+        }
+
         public void ComputeValues(Constants.Calculation calculation, PreparedValues preparedValues,
             SumCurrentColumn sumCurrentColumn, SumCurrentNegativeColumn sumCurrentNegativeColumn,
             SumCurrentInterestColumn sumCurrentInterestColumn, SumCurrentTLMColumn sumCurrentTlmColumn)
@@ -17,6 +22,8 @@ namespace EvoCalculator.Core.Calculation.Columns
                             sumCurrentTlmColumn.Values[i] * (1 + (decimal) calculation.VatValue) -
                             sumCurrentInterestColumn.Values[i] * (1 + (decimal) calculation.VatValue) *
                             (decimal) preparedValues.Repayment;
+
+            PostCheck();
         }
     }
 }

EvoCalculator.Core.Calculation/Columns/SumWithVATColumn.cs

@@ -8,6 +8,11 @@ namespace EvoCalculator.Core.Calculation.Columns
         {
         }
 
+        private void PostCheck()
+        {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+        }
+
         public void ComputeValues(Constants.Calculation constants, SumColumn sumColumn, PreparedValues preparedValues)
         {
             Values[0] = 0;
@@ -18,6 +23,8 @@ namespace EvoCalculator.Core.Calculation.Columns
                 Values[i] = (decimal) (1 + constants.VatValue) * sumColumn.Values[i];
 
             Values[0] = Sum;
+
+            PostCheck();
         }
     }
 }

EvoCalculator.Core.Calculation/Columns/TLM_GrColumn.cs

@@ -8,11 +8,18 @@ namespace EvoCalculator.Core.Calculation.Columns
         {
         }
 
+        private void PostCheck()
+        {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+        }
+
         public void ComputeValues(PreparedPayments preparedPayments, PreparedValues preparedValues)
         {
             for (var i = 1; i < Values.Length; i++) Values[i] = preparedPayments.Rows[i - 1].TlmCostPayment;
 
             Values[0] = -XNPV;
+
+            PostCheck();
         }
     }
 }

EvoCalculator.Core.Calculation/Columns/VATColumn.cs

@@ -8,6 +8,11 @@ namespace EvoCalculator.Core.Calculation.Columns
         {
         }
 
+        private void PostCheck()
+        {
+            new CheckTools<decimal>().CheckColumnForZeroValue(Values);
+        }
+
         public void ComputeValues(Constants.Calculation constants, SumColumn sumColumn, PreparedValues preparedValues)
         {
             Values[0] = 0;
@@ -17,6 +22,8 @@ namespace EvoCalculator.Core.Calculation.Columns
             for (var i = 2; i < Values.Length; i++) Values[i] = (decimal) constants.VatValue * sumColumn.Values[i];
 
             Values[0] = Sum;
+
+            PostCheck();
         }
     }
 }