Improve team identifier handling

WebApp/Components/Pages/TeamPages/Edit.razor

@@ -20,28 +20,15 @@ else
         <MudGrid>
             <MudItem xs="12" sm="7">
                 <MudPaper Class="pa-4">
-                    <MudSelect 
-                        T="Student"
-                        MultiSelection="true" 
-                        @bind-SelectedValues="@_selectedStudents"
-                        ToStringFunc="e => e.Name"
-                        Label="Students">
-
-                        @foreach (var student in _students.OrderBy(e => e.FirstName))
-                        {
-                            <MudSelectItem T="Student" Value="@student">@student.Name</MudSelectItem>
-                        }
-                    </MudSelect>
-                    <MudStack>
-                        <MudText>Captain</MudText>
-                        <MudToggleGroup T="Student" SelectionMode="SelectionMode.ToggleSelection" @bind-Value="Team.Captain" CheckMark>
-                            @foreach (var student in _selectedStudents.OrderBy(e => e.FirstName))
-                            {
-                                <MudToggleItem Value="@(student)" Text="@student.Name" />
-                            }
-                        </MudToggleGroup>
+                    <StudentToggleSelector Students="@_students"
+                                          @bind-SelectedStudents="_selectedStudents"
+                                          Title="Students"
+                                          ShowFullName="true" />
+                    <MudStack Class="mt-4">
+                        <TeamCaptainSelector Students="@_selectedStudents"
+                                            @bind-SelectedCaptain="Team.Captain"
+                                            Title="Captain" />
                     </MudStack>
-                    <MudTextField T="string?" Label="Identifier" @bind-Value="Team.Identifier" For="@(() => Team.Identifier)" Required="false" Clearable="true"></MudTextField>
                 </MudPaper>
             </MudItem>
         </MudGrid>
@@ -57,7 +44,7 @@ else
     [SupplyParameterFromForm]
     private Team? Team { get; set; }
 
-    private IEnumerable<Student> _selectedStudents = new HashSet<Student>();
+    private IEnumerable<Student> _selectedStudents = [];
     private List<Student> _students = [];
 
     protected override async Task OnInitializedAsync()
@@ -67,10 +54,7 @@ else
             .Include(e => e.Students)
             .FirstOrDefaultAsync(m => m.Id == Id);
         _students = await Context.Students.ToListAsync();
-        foreach (var s in Team.Students)
-        {
-            ((HashSet<Student>)_selectedStudents).Add(s);
-        }
+        _selectedStudents = Team.Students.ToList();
 
         if (Team is null)
         {
@@ -89,7 +73,7 @@ else
     // To protect from overposting attacks, enable the specific properties you want to bind to.
     // For more information, see https://learn.microsoft.com/aspnet/core/blazor/forms/#mitigate-overposting-attacks.
     private async Task UpdateTeam()
-    { 
+    {
         //Context.Attach(Team!).Entity = EntityState.Modified;
         Team.Students.Clear();
         foreach (var s in _selectedStudents)
@@ -97,6 +81,13 @@ else
             Team.Students.Add(s);
         }
 
+        // Update identifier for individual events
+        if (Team.Event.EventFormat == EventFormat.Individual && Team.Students.Count == 1)
+        {
+            Team.Captain ??= Team.Students[0];
+            Team.Identifier = Team.Captain.FirstName;
+        }
+
         try
         {
             await Context.SaveChangesAsync();