smarter canvas updates, only update when a change is detected

Management.Web/Pages/Index.razor

@@ -84,6 +84,11 @@
     >
       Sync With Canvas
     </button>
+
+    @if(planner.LoadingCanvasData)
+    {
+      <Spinner />
+    }
   </div>
   <CourseDetails />
 }

Management.Web/Program.cs

@@ -1,6 +1,7 @@
 global using System.Text.Json.Serialization;
 global using System.Text.Json;
 global using System.ComponentModel.DataAnnotations;
+global using Management.Services.Canvas;
 global using CanvasModel.EnrollmentTerms;
 global using CanvasModel.Courses;
 global using CanvasModel;
@@ -19,8 +20,12 @@ var builder = WebApplication.CreateBuilder(args);
 // Add services to the container.
 builder.Services.AddRazorPages();
 builder.Services.AddServerSideBlazor();
+
 builder.Services.AddScoped<IWebRequestor, WebRequestor>();
+builder.Services.AddScoped<CanvasServiceUtils>();
+builder.Services.AddScoped<CanvasAssignmentService>();
 builder.Services.AddScoped<CanvasService, CanvasService>();
+
 builder.Services.AddScoped<YamlManager>();
 builder.Services.AddScoped<CoursePlanner>();
 builder.Services.AddScoped<AssignmentDragContainer>();

Management.Web/Shared/Course/CourseDetails.razor

@@ -14,19 +14,24 @@
   }
   protected override async Task OnInitializedAsync()
   {
-    if(
-      planner.CanvasAssignments == null 
-      && planner.LocalCourse != null 
-      && planner.LocalCourse.CanvasId != null
-    )
-    {
-      var canvasId = planner.LocalCourse.CanvasId ?? throw new Exception("no canvas id found for selected course");
-      planner.CanvasAssignments = await canvas.GetAssignments(canvasId);
-      planner.CanvasModules = await canvas.GetModules(canvasId);
-      System.Console.WriteLine(JsonSerializer.Serialize(planner.CanvasAssignments));
-    }
-    await base.OnInitializedAsync();
   }
+  protected override async Task OnAfterRenderAsync(bool firstRender)
+  {
+    if(firstRender)
+    {
+      if(
+        planner.CanvasAssignments == null 
+        && planner.LocalCourse != null 
+        && planner.LocalCourse.CanvasId != null
+      )
+      {
+        await planner.LoadCanvasData();
+      }
+
+    }
+  }
+
+  
 
   private void reload()
   {

Management.Web/Shared/Module/Assignment/AssignmentDetails.razor

@@ -140,7 +140,19 @@
         </h4>
         @if(isSyncedWithCanvas)
         {
-          <div>Synced With Canvas</div>
+          @if(planner.LocalCourse != null
+            && planner.LocalCourse.CanvasId != null
+            && planner.CanvasAssignments != null
+            && planner.CanvasModules != null 
+            && planner.AssignmentNeedsUpdates(Assignment)
+          )
+          {
+            <div>need to update canvas</div>
+          }
+          else
+          {
+            <div>Canvas is up to date</div>
+          }
         }
         else
         {