Minecraft-Phantom-Panel/Web/Phantom.Web/Pages/Users.razor

@page "/users"
@attribute [Authorize(Permission.ViewUsersPolicy)]
@using System.Collections.Immutable
@using Phantom.Web.Services.Authentication
@using Phantom.Web.Services.Authorization
@using Phantom.Web.Services.Users
@using Phantom.Common.Data.Web.Users
@inherits Phantom.Web.Components.PhantomComponent
@inject UserManager UserManager
@inject RoleManager RoleManager
@inject UserRoleManager UserRoleManager

<h1>Users</h1>

<PermissionView Permission="Permission.EditUsers">
  <button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#add-user">Add User...</button>
</PermissionView>

<AuthorizeView>
  <Authorized>
    @{ var canEdit = context.CheckPermission(Permission.EditUsers); }
    <Table TItem="UserInfo" Items="allUsers">
      <HeaderRow>
        <Column>Username</Column>
        <Column Width="100%">Roles</Column>
        @if (canEdit) {
          <Column MinWidth="175px">Actions</Column>
        }
      </HeaderRow>
      <ItemRow Context="user">
        @{ var isMe = me == user.Guid; }
        <Cell>
          <p class="fw-semibold">@user.Name</p>
          <small class="font-monospace text-uppercase">@user.Guid.ToString()</small>
        </Cell>
        <Cell>
          @(userGuidToRoleDescription.TryGetValue(user.Guid, out var roles) ? roles : "?")
        </Cell>
        @if (canEdit) {
          <Cell>
            @if (!isMe) {
              <button class="btn btn-primary btn-sm" @onclick="() => userRolesDialog.Show(user)">Edit Roles</button>
              <button class="btn btn-danger btn-sm" @onclick="() => userDeleteDialog.Show(user)">Delete...</button>
            }
          </Cell>
        }
      </ItemRow>
      <NoItemsRow>
        No users found.
      </NoItemsRow>
    </Table>
  </Authorized>
</AuthorizeView>

<PermissionView Permission="Permission.EditUsers">
  <UserAddDialog ModalId="add-user" UserAdded="OnUserAdded" />
  <UserRolesDialog @ref="userRolesDialog" ModalId="manage-user-roles" UserModified="OnUserRolesChanged" />
  <UserDeleteDialog @ref="userDeleteDialog" ModalId="delete-user" UserModified="OnUserDeleted" />
</PermissionView>

@code {

  private Guid? me = Guid.Empty;
  private ImmutableArray<UserInfo>? allUsers;
  private ImmutableDictionary<Guid, RoleInfo> allRolesByGuid = ImmutableDictionary<Guid, RoleInfo>.Empty;
  private readonly Dictionary<Guid, string> userGuidToRoleDescription = new ();

  private ImmutableArray<UserInfo> AllUsers => allUsers.GetValueOrDefault(ImmutableArray<UserInfo>.Empty);
  
  private UserRolesDialog userRolesDialog = null!;
  private UserDeleteDialog userDeleteDialog = null!;

  protected override async Task OnInitializedAsync() {
    me = await GetUserGuid();

    allUsers = (await UserManager.GetAll(CancellationToken)).Sort(static (a, b) => a.Name.CompareTo(b.Name));
    allRolesByGuid = (await RoleManager.GetAll(CancellationToken)).ToImmutableDictionary(static role => role.Guid, static role => role);

    var allUserGuids = allUsers
                       .Value
                       .Select(static user => user.Guid)
                       .ToImmutableHashSet();

    foreach (var (userGuid, roleGuids) in await UserRoleManager.GetUserRoles(allUserGuids, CancellationToken)) {
      userGuidToRoleDescription[userGuid] = StringifyRoles(roleGuids);
    }
  }

  private async Task RefreshUserRoles(UserInfo user) {
    userGuidToRoleDescription[user.Guid] = StringifyRoles(await UserRoleManager.GetUserRoles(user.Guid, CancellationToken));
  }

  private string StringifyRoles(ImmutableArray<Guid> roleGuids) {
    return roleGuids.IsEmpty ? "-" : string.Join(", ", roleGuids.Select(StringifyRole));
  }

  private string StringifyRole(Guid role) {
    return allRolesByGuid.TryGetValue(role, out var roleInfo) ? roleInfo.Name : "?";
  }

  private Task OnUserAdded(UserInfo user) {
    allUsers = AllUsers.Add(user);
    return RefreshUserRoles(user);
  }

  private Task OnUserRolesChanged(UserInfo user) {
    return RefreshUserRoles(user);
  }

  private void OnUserDeleted(UserInfo user) {
    allUsers = AllUsers.Remove(user);
    userGuidToRoleDescription.Remove(user.Guid);
  }

}