add permission level changed meta

Application/Meta/PermissionLevelChangedResourceQueryHelper.cs

@@ -0,0 +1,50 @@
+using System.Linq;
+using System.Threading.Tasks;
+using Data.Abstractions;
+using Data.Models;
+using Microsoft.EntityFrameworkCore;
+using SharedLibraryCore.Dtos.Meta.Responses;
+using SharedLibraryCore.Helpers;
+using SharedLibraryCore.Interfaces;
+using SharedLibraryCore.QueryHelper;
+
+namespace IW4MAdmin.Application.Meta;
+
+public class
+    PermissionLevelChangedResourceQueryHelper : IResourceQueryHelper<ClientPaginationRequest,
+        PermissionLevelChangedResponse>
+{
+    private readonly IDatabaseContextFactory _contextFactory;
+
+    public PermissionLevelChangedResourceQueryHelper(IDatabaseContextFactory contextFactory)
+    {
+        _contextFactory = contextFactory;
+    }
+
+    public async Task<ResourceQueryHelperResult<PermissionLevelChangedResponse>> QueryResource(
+        ClientPaginationRequest query)
+    {
+        await using var context = _contextFactory.CreateContext();
+
+        var auditEntries = context.EFChangeHistory.Where(change => change.TargetEntityId == query.ClientId)
+            .Where(change => change.TypeOfChange == EFChangeHistory.ChangeType.Permission);
+
+        var audits = from change in auditEntries
+            join client in context.Clients
+                on change.OriginEntityId equals client.ClientId
+            select new PermissionLevelChangedResponse
+            {
+                ChangedById = change.OriginEntityId,
+                ChangedByName = client.CurrentAlias.Name,
+                PreviousPermissionLevelValue = change.PreviousValue,
+                CurrentPermissionLevelValue = change.CurrentValue,
+                When = change.TimeChanged,
+                ClientId = change.TargetEntityId
+            };
+
+        return new ResourceQueryHelperResult<PermissionLevelChangedResponse>
+        {
+            Results = await audits.Skip(query.Offset).Take(query.Count).ToListAsync()
+        };
+    }
+}