refactor(app): implement year filtering for accounts and enhance dashboard PDF generation

src/Duempelkas.Infrastructure/Services/PdfStatementService.cs

@@ -146,7 +146,12 @@ public class PdfStatementService : IPdfStatementService
         return document.GeneratePdf();
     }
 
-    public async Task<byte[]> GenerateDashboardStatementAsync()
+    public Task<byte[]> GenerateDashboardStatementAsync()
+    {
+        return GenerateDashboardStatementAsync(null);
+    }
+
+    public async Task<byte[]> GenerateDashboardStatementAsync(int? year)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
 
@@ -169,25 +174,65 @@ public class PdfStatementService : IPdfStatementService
             transferByEntryId[transfer.TargetEntryId] = transfer;
         }
 
-        var entries = await db.Entries
+        var entriesQuery = db.Entries
             .Include(e => e.Account)
-            .Where(e => !e.IsDeleted)
+            .Where(e => !e.IsDeleted);
+
+        if (year.HasValue)
+        {
+            entriesQuery = entriesQuery.Where(e => e.Date.Year == year.Value);
+        }
+
+        var entries = await entriesQuery
             .OrderBy(e => e.Date)
             .ThenBy(e => e.CreatedUtc)
             .ToListAsync();
 
-        var movementByAccountId = entries
-            .GroupBy(e => e.AccountId)
-            .ToDictionary(
-                g => g.Key,
-                g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+        Dictionary<int, decimal> balanceByAccountId;
+        Dictionary<int, decimal>? carryoverByAccountId = null;
 
-        var balanceByAccountId = accounts
-            .ToDictionary(
-                a => a.Id,
-                a => a.CarryoverBalance + movementByAccountId.GetValueOrDefault(a.Id));
+        if (year.HasValue)
+        {
+            var movementBeforeYearByAccountId = await db.Entries
+                .Where(e => !e.IsDeleted && e.Date.Year < year.Value)
+                .GroupBy(e => e.AccountId)
+                .ToDictionaryAsync(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
 
-        var totalClubBalance = accounts.Sum(a => a.CarryoverBalance + movementByAccountId.GetValueOrDefault(a.Id));
+            var movementInYearByAccountId = entries
+                .GroupBy(e => e.AccountId)
+                .ToDictionary(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+            carryoverByAccountId = accounts
+                .ToDictionary(
+                    a => a.Id,
+                    a => a.CarryoverBalance + movementBeforeYearByAccountId.GetValueOrDefault(a.Id));
+
+            balanceByAccountId = accounts
+                .ToDictionary(
+                    a => a.Id,
+                    a => a.CarryoverBalance
+                        + movementBeforeYearByAccountId.GetValueOrDefault(a.Id)
+                        + movementInYearByAccountId.GetValueOrDefault(a.Id));
+        }
+        else
+        {
+            var movementByAccountId = entries
+                .GroupBy(e => e.AccountId)
+                .ToDictionary(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+            balanceByAccountId = accounts
+                .ToDictionary(
+                    a => a.Id,
+                    a => a.CarryoverBalance + movementByAccountId.GetValueOrDefault(a.Id));
+        }
+
+        var totalClubBalance = balanceByAccountId.Values.Sum();
 
         var processedTransferIds = new HashSet<int>();
         var rows = new List<DashboardStatementRow>();
@@ -248,7 +293,10 @@ public class PdfStatementService : IPdfStatementService
                 page.Header().Column(col =>
                 {
                     col.Item().Text(clubName).Bold().FontSize(18);
-                    col.Item().Text("Übersicht aller Konten").FontSize(13).FontColor(Colors.Grey.Darken1);
+                    var headerTitle = year.HasValue
+                        ? $"Übersicht aller Konten ({year.Value})"
+                        : "Übersicht aller Konten";
+                    col.Item().Text(headerTitle).FontSize(13).FontColor(Colors.Grey.Darken1);
                     col.Item().PaddingTop(2).Text($"Gesamtvermögen: {FormatCurrency(totalClubBalance)}")
                         .FontSize(10)
                         .SemiBold()
@@ -285,6 +333,18 @@ public class PdfStatementService : IPdfStatementService
                             }
                         });
 
+                        if (year.HasValue && carryoverByAccountId is not null)
+                        {
+                            BodyCell(table, string.Empty);
+                            BodyCell(table, string.Empty);
+                            BodyCell(table, $"Übertrag von {year.Value - 1}", alignRight: true);
+
+                            foreach (var account in accounts)
+                            {
+                                BodyAmountCell(table, carryoverByAccountId.GetValueOrDefault(account.Id));
+                            }
+                        }
+
                         foreach (var row in rows)
                         {
                             BodyCell(table, row.DisplayId);