ChartWindow: Automatically calculate variant when saved

Elwig/Windows/ChartWindow.xaml

@@ -101,7 +101,7 @@
             </ListBox.ItemTemplate>
         </ListBox>
 
-        <Button x:Name="SaveButton" Content="Speichern" IsEnabled="False"
+        <Button x:Name="SaveButton" Content="Speichern &amp; Berechnen" IsEnabled="False"
             HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="10,5,35,10" Grid.Column="0" Grid.Row="2"
             Click="SaveButton_Click"/>
 

Elwig/Windows/ChartWindow.xaml.cs

@@ -651,6 +651,12 @@ namespace Elwig.Windows {
                     ctx.Update(PaymentVar);
                     await ctx.SaveChangesAsync();
                 }
+                try {
+                    var b = new BillingVariant(PaymentVar.Year, PaymentVar.AvNr);
+                    await b.Calculate();
+                } catch (Exception exc) {
+                    MessageBox.Show(exc.Message, "Berechnungsfehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                }
                 LockContext = false;
                 App.HintContextChange();
             } catch (Exception exc) {

Elwig/Windows/PaymentVariantsWindow.xaml.cs

@@ -1,18 +1,18 @@
+using Elwig.Documents;
 using Elwig.Helpers;
+using Elwig.Helpers.Billing;
+using Elwig.Helpers.Export;
 using Elwig.Models.Dtos;
 using Elwig.Models.Entities;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Win32;
 using System;
 using System.Linq;
+using System.Text.Json;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
-using Elwig.Helpers.Billing;
-using Elwig.Helpers.Export;
-using Microsoft.Win32;
-using System.Text.Json;
-using Elwig.Documents;
 
 namespace Elwig.Windows {
     public partial class PaymentVariantsWindow : ContextWindow {
@@ -123,6 +123,15 @@ namespace Elwig.Windows {
                 ConsiderAutoInput.IsEnabled = !locked;
                 ConsiderCustomInput.IsEnabled = !locked;
                 DataInput.IsReadOnly = locked;
+
+                ModifierSum.Text = "...";
+                TotalSum.Text = "...";
+                VatSum.Text = "...";
+                DeductionSum.Text = "...";
+                PaymentSum.Text = "...";
+                Utils.RunBackground("Variantendaten laden", async () => {
+                    await UpdateSums(v);
+                });
             } else {
                 EditButton.Content = "Bearbeiten";
                 EditButton.IsEnabled = false;
@@ -167,8 +176,14 @@ namespace Elwig.Windows {
                 ConsiderCustomInput.IsEnabled = false;
                 DataInput.Text = "";
                 DataInput.IsReadOnly = true;
+
+                ModifierSum.Text = "-";
+                TotalSum.Text = "-";
+                VatSum.Text = "-";
+                DeductionSum.Text = "-";
+                PaymentSum.Text = "-";
             }
-            await UpdateSums();
+
             UpdateSaveButton();
         }
 
@@ -187,37 +202,80 @@ namespace Elwig.Windows {
             CommitButton.IsEnabled = CalculateButton.IsEnabled;
         }
 
-        private async Task UpdateSums() {
-            if (PaymentVariantList.SelectedItem is PaymentVar v) {
+        private async Task UpdateSums(PaymentVar v) {
+            if (App.MainDispatcher == null)
+                return;
+            var modText = "-";
+            var totalText = "-";
+            var vatText = "-";
+            var deductionText = "-";
+            var paymentText = "-";
+
             using var ctx = new AppDbContext();
             var sym = v.Season.Currency.Symbol ?? v.Season.Currency.Code;
+
             var modSum = await ctx.PaymentDeliveryParts
                 .Where(p => p.Year == v.Year && p.AvNr == v.AvNr)
                 .SumAsync(p => p.AmountValue - p.NetAmountValue);
-                ModifierSum.Text = $"{v.Season.DecFromDb(modSum):N2} {sym}";
+            modText = $"{v.Season.DecFromDb(modSum):N2} {sym}";
+
             var totalSum = await ctx.MemberPayments
                 .Where(p => p.Year == v.Year && p.AvNr == v.AvNr)
                 .SumAsync(p => p.AmountValue);
-                TotalSum.Text = $"{v.Season.DecFromDb(totalSum):N2} {sym}";
+            totalText = $"{v.Season.DecFromDb(totalSum):N2} {sym}";
+
+            await App.MainDispatcher.BeginInvoke(() => {
+                if (PaymentVariantList.SelectedItem != v)
+                    return;
+                ModifierSum.Text = modText;
+                TotalSum.Text = totalText;
+            });
+
             var credits = ctx.Credits.Where(c => c.Year == v.Year && c.AvNr == v.AvNr);
             if (!credits.Any()) {
-                    VatSum.Text = $"- {sym}";
-                    DeductionSum.Text = $"- {sym}";
-                    PaymentSum.Text = $"- {sym}";
+                long lastTotalSum = 0;
+                decimal vatSum = 0;
+                var currentPayments = await ctx.MemberPayments
+                        .Where(p => p.Year == v.Year && p.AvNr == v.AvNr)
+                        .ToDictionaryAsync(p => p.MgNr);
+                var lastV = await ctx.PaymentVariants
+                    .Where(l => l.Year == v.Year && !l.TestVariant)
+                    .OrderByDescending(l => l.TransferDateString ?? l.DateString)
+                    .ThenByDescending(l => l.AvNr)
+                    .FirstOrDefaultAsync();
+                if (lastV != null) {
+                    var lastPayments = await ctx.MemberPayments
+                        .Where(p => p.Year == v.Year && p.AvNr == lastV.AvNr)
+                        .ToDictionaryAsync(p => p.MgNr);
+                    lastTotalSum = lastPayments.Sum(e => e.Value.AmountValue);
+                    foreach (int mgnr in currentPayments.Keys) {
+                        var c = currentPayments[mgnr];
+                        var l = lastPayments[mgnr];
+                        vatSum += (c.Amount - l.Amount) * (c.Member.IsBuchführend ? 0.1m : 0.13m);
+                    }
+                } else {
+                    vatSum = currentPayments.Sum(e => e.Value.Amount * (e.Value.Member.IsBuchführend ? 0.1m : 0.13m));
+                }
+                vatText = $"~{vatSum:N2} {sym}";
+                deductionText = $"- {sym}";
+                paymentText = $"~{v.Season.DecFromDb(totalSum - lastTotalSum) + vatSum:N2} {sym}";
             } else {
                 // all values in the credit table are stored with precision 2!
-                    TotalSum.Text = $"{Utils.DecFromDb(await credits.SumAsync(c => c.NetAmountValue), 2):N2} {sym}";
-                    VatSum.Text = $"{Utils.DecFromDb(await credits.SumAsync(c => c.VatAmountValue), 2):N2} {sym}";
-                    DeductionSum.Text = $"{-Utils.DecFromDb(await credits.SumAsync(c => c.ModifiersValue ?? 0), 2):N2} {sym}";
-                    PaymentSum.Text = $"{Utils.DecFromDb(await credits.SumAsync(c => c.AmountValue), 2):N2} {sym}";
-                }
-            } else {
-                ModifierSum.Text = "-";
-                TotalSum.Text = "-";
-                VatSum.Text = "-";
-                DeductionSum.Text = "-";
-                PaymentSum.Text = "-";
+                totalText = $"{Utils.DecFromDb(await credits.SumAsync(c => c.NetAmountValue), 2):N2} {sym}";
+                vatText = $"{Utils.DecFromDb(await credits.SumAsync(c => c.VatAmountValue), 2):N2} {sym}";
+                deductionText = $"{-Utils.DecFromDb(await credits.SumAsync(c => c.ModifiersValue ?? 0), 2):N2} {sym}";
+                paymentText = $"{Utils.DecFromDb(await credits.SumAsync(c => c.AmountValue), 2):N2} {sym}";
             }
+
+            await App.MainDispatcher.BeginInvoke(() => {
+                if (PaymentVariantList.SelectedItem != v)
+                    return;
+                ModifierSum.Text = modText;
+                TotalSum.Text = totalText;
+                VatSum.Text = vatText;
+                DeductionSum.Text = deductionText;
+                PaymentSum.Text = paymentText;
+            });
         }
 
         private async void PaymentVariantList_SelectionChanged(object sender, SelectionChangedEventArgs evt) {