Refactor Audit service and view: implement GetCount and LoadPage methods, update OnReadData for improved data handling

Co-authored-by: Copilot <copilot@github.com>

FoodsharingSiegen.Server/Pages/AuditView.razor.cs

@@ -1,3 +1,4 @@
+using Blazorise.DataGrid;
 using FoodsharingSiegen.Contracts.Entity;
 using FoodsharingSiegen.Server.Data.Service;
 using Microsoft.AspNetCore.Components;
@@ -26,16 +27,44 @@ namespace FoodsharingSiegen.Server.Pages
         /// </summary>
         private List<Audit>? Audits { get; set; }
 
+        /// <summary>
+        ///     Gets or sets the value of the total audits (ab)
+        /// </summary>
+        private int TotalAudits { get; set; }
+
         #endregion
 
         #region Override InitializeDataAsync
 
         /// <inheritdoc />
-        protected override async Task InitializeDataAsync()
+        protected override Task InitializeDataAsync()
         {
-            var loadR = await AuditService?.Load(100)!;
-            if (loadR.Success)
-                Audits = loadR.Data;
+            return Task.CompletedTask;
+        }
+
+        #endregion
+
+        #region Private Method OnReadData
+
+        /// <summary>
+        ///     Called when data is read (ab)
+        /// </summary>
+        /// <param name="e">The params</param>
+        private async Task OnReadData(DataGridReadDataEventArgs<Audit> e)
+        {
+            var countLoad = await AuditService?.GetCount()!;
+            if (countLoad.Success)
+                TotalAudits = countLoad.Data;
+
+            // Default fallback if VirtualizeCount is not set, though Blazor shouldn't do this usually
+            var limit = e.VirtualizeCount > 0 ? e.VirtualizeCount : 50;
+            var offset = e.VirtualizeOffset;
+
+            var itemsLoad = await AuditService?.LoadPage(offset, limit)!;
+            if (itemsLoad.Success)
+                Audits = itemsLoad.Data;
+
+            await InvokeAsync(StateHasChanged);
         }
 
         #endregion