Price change history bug divide by zero fix

Client/Pages/Dashboard/Elements/ProductPriceHistory.razor.cs

@@ -25,6 +25,7 @@ namespace Biskilog_Accounting.Client.Pages.Dashboard.Elements
         private Timer m_timer { get; set; }
         private ApexChart<ProductPriceChange> chart;
         private Random m_random = new Random();
+        private int tries = 10;
         protected override void OnInitialized()
         {
             base.OnInitialized();
@@ -37,35 +38,61 @@ namespace Biskilog_Accounting.Client.Pages.Dashboard.Elements
 
         private void TimerElapsed(object sender, ElapsedEventArgs e)
         {
+            tries = 0;
             // Code to execute every 10 seconds
             InvokeAsync(async () =>
             {
+                await GetPriceChange();
+                StateHasChanged();
+                await chart.RenderAsync();
+            });
+        }
+        private async Task GetPriceChange()
+        {
+            tries++;
             if (m_productHistory.Count > 0)
             {
                 int randomNumber = m_random.Next(ProductHistory.Count);
-                    m_currentProduct = ProductHistory[randomNumber].Pcode;
+
                 m_productHistory = ProductHistory.Where(t => t.Pcode == m_currentProduct).ToList();
 
                 ProductPriceChange change = m_productHistory.First();
+                double actualChange = (double)((change.CurrentPrice - change.PreviousPrice));
+                if (actualChange == 0)
+                {
+                    // if randomly selected doesn't have any product change history
+                    if (!string.IsNullOrEmpty(m_currentProduct))
+                    {
+                        return;
+                    }
+                    else
+                    {
+                        if (tries < 3)
+                        {
+                            GetPriceChange();
+                        }
+                        return;
+                    }
+                }
+                else
+                {
                     m_percentage = (double)((change.CurrentPrice - change.PreviousPrice) / change.PreviousPrice > 0 ? change.PreviousPrice * 100 : 1);
+                }
+
                 m_increase = change.CurrentPrice > change.PreviousPrice;
                 m_currentPrice = (double)change.CurrentPrice;
                 m_productName = change.ProductName;
                 m_subtitle = $"Price :{m_calculator.GetCurrencyCode().CurrencySymbol}";
                 m_title = $"{m_productName} Price Changes";
-                    StateHasChanged();
-                    await chart.RenderAsync();
             }
-            });
         }
-
         public void Dispose()
         {
             // Dispose of the timer when the component is disposed
             m_timer?.Stop();
             m_timer?.Dispose();
         }
-        protected override void OnParametersSet()
+        protected override async void OnParametersSet()
         {
             if (!IsLoading)
             {
@@ -101,21 +128,8 @@ namespace Biskilog_Accounting.Client.Pages.Dashboard.Elements
                     }
                 }
             };
-                Random random = new Random();
-                int randomNumber = random.Next(ProductHistory.Count);
-                m_currentProduct = ProductHistory[randomNumber].Pcode;
-                m_productHistory = ProductHistory.Where(t => t.Pcode == m_currentProduct).ToList();
 
-                if (m_productHistory.Count > 0)
-                {
-                    ProductPriceChange change = m_productHistory.First();
-                    m_percentage = (double)((change.CurrentPrice - change.PreviousPrice) / change.PreviousPrice > 0 ? change.PreviousPrice * 100 : 1);
-                    m_increase = change.CurrentPrice > change.PreviousPrice;
-                    m_currentPrice = (double)change.CurrentPrice;
-                    m_productName = change.ProductName;
-                    m_subtitle = $"Price :{m_calculator.GetCurrencyCode().CurrencySymbol}";
-                    m_title = $"{m_productName} Price Changes";
-                }
+                await GetPriceChange();
             }
             base.OnParametersSet();
         }

Server/Services/AnalyticalService.cs

@@ -89,7 +89,7 @@ namespace Biskilog_Accounting.Server.Services
                 yield return new CustomerAccounts
                 {
                     Customer = m_context.Tblcustomers.FirstOrDefault(i => i.CustomerId == customerId),
-                    Debt = m_context.Customeraccounts.OrderByDescending(d => d.Date).FirstOrDefault(t => t.Balance < 0 && t.CustomerId == customerId).Balance,
+                    Debt = m_context.Customeraccounts.AsEnumerable().OrderByDescending(d => d.Date).FirstOrDefault(t => t.Balance < 0 && t.CustomerId == customerId).Balance,
                 };
             }
         }