AccountInfo history statistics query

WotBlitzStatisticsPro.Logic/AccountInformationPipeline/Operations/FillPeriodDifferenceOperation.cs

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+using System;
+using System.Threading.Tasks;
+using AutoMapper;
+using WotBlitzStatisticsPro.Common.Model;
+using WotBlitzStatisticsPro.Logic.AccountInformationPipeline.OperationContext;
+using WotBlitzStatisticsPro.Logic.Calculations;
+using WotBlitzStatisticsPro.Logic.Pipeline;
+
+namespace WotBlitzStatisticsPro.Logic.AccountInformationPipeline.Operations
+{
+    public class FillPeriodDifferenceOperation : IOperation<IOperationContext>
+    {
+        public Task Invoke(IOperationContext context, Func<IOperationContext, Task> next)
+        {
+            var contextData = context.Get<IStatisticsPipelineData>();
+
+            if (contextData.History.Length > 1)
+            {
+                contextData.PeriodDifference = new StatisticsDifference();
+                var historyLastIndex = contextData.History.Length - 1;
+
+                contextData.PeriodDifference.FillDifference(contextData.History[0], contextData.History[historyLastIndex]);
+            }
+
+            return next.Invoke(context);
+        }
+    }
+}