feat(accounts): preview and confirm cross-year balance corrections (U12)

src/Duempelkas.App/Components/Dialogs/AddAccountDialog.razor

@@ -1,4 +1,5 @@
-<ModalDialog @ref="modal" Title="Neues Konto" OnCancel="OnCancel" Dirty="@(!string.IsNullOrWhiteSpace(name))">
+@inject ToastService Toasts
+<ModalDialog @ref="modal" Title="Neues Konto" OnCancel="OnCancel" Dirty="@(!string.IsNullOrWhiteSpace(name) || initialAmount != "0,00")" Busy="saving">
         <h5 class="mb-3">Neues Konto</h5>
         <form @onsubmit="Save" @onsubmit:preventDefault="true">
         <div class="form-container">
@@ -6,8 +7,11 @@
             <input id="account-name" data-initial-focus type="text" class="form-control" @bind="name" @bind:event="oninput"
                    placeholder="z.B. Girokonto" />
         </div>
+        <label for="account-initial">Anfangsbestand (€)</label>
+        <AmountInput Id="account-initial" @bind-Value="initialAmount" AllowNegative="true" Disabled="saving" />
+        <p>Geld, das vor der ersten erfassten Buchung vorhanden ist. 0 ist möglich, ein Minus bei überzogenem Konto ebenfalls. Der Anfangsbestand zählt nicht als neue Einnahme.</p>
         <div class="d-flex justify-content-end gap-2">
-            <button type="submit" class="btn btn-success" disabled="@string.IsNullOrWhiteSpace(name)"><i class="bi bi-check-lg"></i> Erstellen</button>
+            <button type="submit" class="btn btn-success" disabled="@(saving || string.IsNullOrWhiteSpace(name) || !ValidInitial)"><i class="bi bi-check-lg"></i> Erstellen</button>
             <button type="button" class="btn btn-outline-secondary" @onclick="Cancel"><i class="bi bi-x-lg"></i> Abbrechen</button>
         </div>
         </form>

src/Duempelkas.App/Components/Dialogs/AddAccountDialog.razor.cs

@@ -7,7 +7,7 @@ public partial class AddAccountDialog
     #region Parameters
 
     [Parameter]
-    public EventCallback<string> OnSave { get; set; }
+    public EventCallback<Duempelkas.App.Services.Models.AccountSetup> OnSave { get; set; }
 
     [Parameter]
     public EventCallback OnCancel { get; set; }
@@ -17,6 +17,9 @@ public partial class AddAccountDialog
     #region Fields
 
     private string name = string.Empty;
+    private string initialAmount = "0,00";
+    private bool ValidInitial => Duempelkas.App.Services.BookingInput.TryBalance(initialAmount, out _);
+    private bool saving;
 
     #endregion
 
@@ -24,9 +27,12 @@ public partial class AddAccountDialog
 
     private async Task Save()
     {
-        if (!string.IsNullOrWhiteSpace(name))
+        if (!saving && !string.IsNullOrWhiteSpace(name) && ValidInitial)
         {
-            await OnSave.InvokeAsync(name.Trim());
+            saving = true;
+            try { Duempelkas.App.Services.BookingInput.TryBalance(initialAmount, out var initial); await OnSave.InvokeAsync(new(name.Trim(), initial)); }
+            catch (Exception ex) { Toasts.Show("Das Konto konnte nicht angelegt werden. Die Eingaben bleiben erhalten.", Duempelkas.App.Services.ToastKind.Error, ex.Message); }
+            finally { saving = false; }
         }
     }
 

src/Duempelkas.App/Components/Dialogs/EditCarryoverDialog.razor

@@ -1,13 +1,21 @@
-<ModalDialog @ref="modal" Title="Bestand korrigieren" OnCancel="OnCancel" Dirty="@(amount != CurrentAmount)">
-        <h5 class="mb-3">Übertrag bearbeiten</h5>
-        <div class="form-container">
-            <label class="form-label" for="carryover">Übertrag (€)</label>
-            <input id="carryover" data-initial-focus type="number" class="form-control no-spinner" step="0.01" @bind="amount" />
-        </div>
-        <div class="d-flex justify-content-end gap-2">
-            <button type="button" class="btn btn-success" @onclick="Save"><i class="bi bi-check-lg"></i> Speichern</button>
-            <button type="button" class="btn btn-outline-secondary" @onclick="Cancel"><i class="bi bi-x-lg"></i> Abbrechen</button>
-        </div>
+@inject ToastService Toasts
+<ModalDialog @ref="modal" Title="Bestandskorrektur" OnCancel="OnCancel" Dirty="@(amount != CurrentAmount)" Busy="saving">
+    <h5>Bestandskorrektur – @AccountName</h5>
+    <p>@(Year.HasValue ? $"Übertrag zum 01.01.{Year}" : "Gemeinsamer Anfangsbestand – alle Jahre")</p>
+    <p>Anfangsbestand + Einnahmen − Ausgaben = Kontostand</p>
+    <p>Dies ist eine spätere Korrektur, keine zusätzliche Einnahme oder Ausgabe.</p>
+    <label for="carryover">@(Year.HasValue ? "Neuer Übertrag (€)" : "Neuer Anfangsbestand (€)")</label>
+    <AmountInput Id="carryover" Value="amountText" ValueChanged="ChangeAmount" AllowNegative="true" Disabled="saving" />
+    <div class="correction-preview">
+        <p>Gewählter Bestand: @Money(CurrentAmount) → @Money(amount)</p>
+        <p>Gemeinsamer Anfangsbestand: @Money(InitialBalance) → @Money(InitialBalance + Delta)</p>
+        <p>Kontostand der Ansicht: @Money(CurrentEndBalance) → @Money(CurrentEndBalance + Delta)</p>
+        <p><strong>Alle Kontostände dieses Kontos ändern sich um @Money(Delta). Das betrifft frühere und spätere Jahre.</strong></p>
+    </div>
+    <label><input type="checkbox" @bind="acknowledged" disabled="@saving" /> Ich habe die Auswirkungen auf alle Jahre geprüft.</label>
+    <div class="dialog-actions">
+        <button type="button" class="btn btn-success" disabled="@(saving || !ValidAmount || !acknowledged || Delta == 0m)" @onclick="Save">Korrektur speichern</button>
+        <button type="button" class="btn btn-outline-secondary" disabled="@saving" data-safe-focus @onclick="Cancel">Abbrechen</button>
+    </div>
 </ModalDialog>
-
 @code { private ModalDialog? modal; }

src/Duempelkas.App/Components/Dialogs/EditCarryoverDialog.razor.cs

@@ -1,39 +1,36 @@
 using Microsoft.AspNetCore.Components;
-
+using Duempelkas.App.Services;
 namespace Duempelkas.App.Components.Dialogs;
 
 public partial class EditCarryoverDialog
 {
-    #region Parameters
-
-    [Parameter]
-    public decimal CurrentAmount { get; set; }
-
-    [Parameter]
-    public EventCallback<decimal> OnSave { get; set; }
-
-    [Parameter]
-    public EventCallback OnCancel { get; set; }
-
-    #endregion
-
-    #region Fields
-
-    private decimal amount;
-
-    #endregion
-
-    #region Lifecycle
-
-    protected override void OnParametersSet() => amount = CurrentAmount;
-
-    #endregion
-
-    #region Actions
-
-    private async Task Save() => await OnSave.InvokeAsync(amount);
-
-    private async Task Cancel() { if (modal != null) await modal.RequestCloseAsync(); else await OnCancel.InvokeAsync(); }
-
-    #endregion
+    [Parameter] public decimal CurrentAmount { get; set; }
+    [Parameter] public decimal InitialBalance { get; set; }
+    [Parameter] public decimal CurrentEndBalance { get; set; }
+    [Parameter] public int? Year { get; set; }
+    [Parameter] public string AccountName { get; set; } = "Konto";
+    [Parameter] public EventCallback<decimal> OnSave { get; set; }
+    [Parameter] public EventCallback OnCancel { get; set; }
+    private string amountText = string.Empty;
+    private bool acknowledged;
+    private bool initialized;
+    private bool saving;
+    private bool ValidAmount => BookingInput.TryBalance(amountText, out _);
+    private decimal amount => BookingInput.TryBalance(amountText, out var value) ? value : CurrentAmount;
+    private decimal Delta => amount - CurrentAmount;
+    private static string Money(decimal value) => value.ToString("N2", System.Globalization.CultureInfo.GetCultureInfo("de-DE")) + " €";
+    protected override void OnParametersSet()
+    {
+        if (!initialized) { amountText = CurrentAmount.ToString("0.00", System.Globalization.CultureInfo.GetCultureInfo("de-DE")); initialized = true; }
+    }
+    private void ChangeAmount(string value) { amountText = value; acknowledged = false; }
+    private async Task Save()
+    {
+        if (saving || !ValidAmount || !acknowledged || Delta == 0m) return;
+        saving = true;
+        try { await OnSave.InvokeAsync(amount); }
+        catch (Exception ex) { Toasts.Show("Die Korrektur konnte nicht gespeichert werden. Bitte den aktuellen Bestand prüfen.", ToastKind.Error, ex.Message); }
+        finally { saving = false; }
+    }
+    private Task Cancel() => modal?.RequestCloseAsync() ?? Task.CompletedTask;
 }