refactor(app): implement year filter for account entries and update related services

src/Duempelkas.App/Pages/Accounts/AccountDetail.razor.cs

@@ -21,7 +21,9 @@ public partial class AccountDetail
     private bool showAddTransfer;
     private bool showEditName;
     private bool showEditCarryover;
-    private bool showCurrentYearOnly = true;
+    private bool showYearFilterDialog;
+    private int? selectedYear = DateTime.Now.Year;
+    private List<int> availableYears = [];
 
     private int? confirmDeleteEntryId;
     private string? confirmDeleteEntryTitle;
@@ -56,14 +58,26 @@ public partial class AccountDetail
     private async Task LoadAll()
     {
         account = await AccountService.GetAccountAsync(AccountId);
-        balance = await BalanceQueryService.GetAccountBalanceAsync(AccountId);
-        entries = await EntryService.GetEntriesAsync(AccountId, showCurrentYearOnly);
+        balance = await BalanceQueryService.GetAccountBalanceAsync(AccountId, selectedYear);
+        entries = await EntryService.GetEntriesAsync(AccountId, selectedYear);
+        availableYears = await EntryService.GetEntryYearsAsync(AccountId);
     }
 
-    private async Task ToggleYearFilter()
+    private void OpenYearFilterDialog()
     {
-        showCurrentYearOnly = !showCurrentYearOnly;
-        entries = await EntryService.GetEntriesAsync(AccountId, showCurrentYearOnly);
+        showYearFilterDialog = true;
+    }
+
+    private void CloseYearFilterDialog()
+    {
+        showYearFilterDialog = false;
+    }
+
+    private async Task SelectFilterYear(int? year)
+    {
+        selectedYear = year;
+        showYearFilterDialog = false;
+        await LoadAll();
     }
 
     #endregion
@@ -79,7 +93,7 @@ public partial class AccountDetail
 
     private async Task HandleSaveCarryover(decimal newAmount)
     {
-        await AccountService.UpdateCarryoverAsync(AccountId, newAmount);
+        await AccountService.UpdateCarryoverAsync(AccountId, newAmount, selectedYear);
         showEditCarryover = false;
         await LoadAll();
     }
@@ -164,8 +178,8 @@ public partial class AccountDetail
 
     private async Task HandleExport()
     {
-        var pdf = await PdfStatementService.GenerateStatementAsync(AccountId, showCurrentYearOnly);
-        var suffix = showCurrentYearOnly ? $"_{DateTime.Now.Year}" : "_Gesamt";
+        var pdf = await PdfStatementService.GenerateStatementAsync(AccountId, selectedYear);
+        var suffix = selectedYear.HasValue ? $"_{selectedYear.Value}" : "_Gesamt";
         savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{account?.Name}{suffix}.pdf");
     }
 
@@ -190,5 +204,7 @@ public partial class AccountDetail
 
     private static string FormatAmount(decimal amount) => $"{amount:N2} €";
 
+    private string GetFilterLabel() => selectedYear?.ToString() ?? "Alle";
+
     #endregion
 }