feat: Allow admin to create new text channels

toju-app/src/app/features/room/rooms-side-panel/rooms-side-panel.component.html

@@ -77,9 +77,12 @@
                   #renameInput
                   type="text"
                   [value]="ch.name"
+                  [class.border-destructive]="renamingChannelId() === ch.id && !!channelNameError()"
+                  [title]="renamingChannelId() === ch.id ? (channelNameError() ?? '') : ''"
                   (keydown.enter)="confirmRename($event)"
                   (keydown.escape)="cancelRename()"
                   (blur)="confirmRename($event)"
+                  (input)="clearChannelNameError()"
                   class="flex-1 bg-secondary border border-border rounded px-1 py-0.5 text-sm text-foreground focus:outline-none focus:ring-1 focus:ring-primary"
                   (click)="$event.stopPropagation()"
                 />
@@ -132,9 +135,12 @@
                       #renameInput
                       type="text"
                       [value]="ch.name"
+                      [class.border-destructive]="renamingChannelId() === ch.id && !!channelNameError()"
+                      [title]="renamingChannelId() === ch.id ? (channelNameError() ?? '') : ''"
                       (keydown.enter)="confirmRename($event)"
                       (keydown.escape)="cancelRename()"
                       (blur)="confirmRename($event)"
+                      (input)="clearChannelNameError()"
                       class="flex-1 bg-secondary border border-border rounded px-1 py-0.5 text-sm text-foreground focus:outline-none focus:ring-1 focus:ring-primary"
                       (click)="$event.stopPropagation()"
                     />
@@ -483,7 +489,12 @@
       [(ngModel)]="newChannelName"
       placeholder="Channel name"
       class="w-full px-3 py-2 bg-secondary rounded border border-border text-foreground focus:outline-none focus:ring-2 focus:ring-primary text-sm"
+      [class.border-destructive]="!!channelNameError()"
+      (ngModelChange)="clearChannelNameError()"
       (keydown.enter)="confirmCreateChannel()"
     />
+    @if (channelNameError()) {
+      <p class="mt-2 text-sm text-destructive">{{ channelNameError() }}</p>
+    }
   </app-confirm-dialog>
 }

toju-app/src/app/features/room/rooms-side-panel/rooms-side-panel.component.ts

@@ -40,6 +40,10 @@ import { VoiceActivityService, VoiceConnectionFacade } from '../../../domains/vo
 import { VoiceSessionFacade, VoiceWorkspaceService } from '../../../domains/voice-session';
 import { VoicePlaybackService } from '../../../domains/voice-connection/application/voice-playback.service';
 import { VoiceControlsComponent } from '../../../domains/voice-session/feature/voice-controls/voice-controls.component';
+import {
+  isChannelNameTaken,
+  normalizeChannelName
+} from '../../../store/rooms/room-channels.rules';
 import {
   ContextMenuComponent,
   UserAvatarComponent,
@@ -152,6 +156,7 @@ export class RoomsSidePanelComponent {
   contextChannel = signal<Channel | null>(null);
 
   renamingChannelId = signal<string | null>(null);
+  channelNameError = signal<string | null>(null);
 
   showCreateChannelDialog = signal(false);
   createChannelType = signal<'text' | 'voice'>('text');
@@ -243,6 +248,7 @@ export class RoomsSidePanelComponent {
     const ch = this.contextChannel();
 
     this.closeChannelMenu();
+    this.channelNameError.set(null);
 
     if (ch) {
       this.renamingChannelId.set(ch.id);
@@ -251,10 +257,29 @@ export class RoomsSidePanelComponent {
 
   confirmRename(event: Event) {
     const input = event.target as HTMLInputElement;
-    const name = input.value.trim();
+    const name = normalizeChannelName(input.value);
     const channelId = this.renamingChannelId();
 
-    if (channelId && name) {
+    if (!channelId) {
+      return;
+    }
+
+    const validationError = this.getChannelNameError(name, channelId);
+
+    if (validationError) {
+      this.channelNameError.set(validationError);
+      requestAnimationFrame(() => {
+        input.focus();
+        input.select();
+      });
+      return;
+    }
+
+    this.channelNameError.set(null);
+
+    const currentName = this.currentRoom()?.channels?.find((channel) => channel.id === channelId)?.name;
+
+    if (currentName !== name) {
       this.store.dispatch(RoomsActions.renameChannel({ channelId, name }));
     }
 
@@ -262,6 +287,7 @@ export class RoomsSidePanelComponent {
   }
 
   cancelRename() {
+    this.channelNameError.set(null);
     this.renamingChannelId.set(null);
   }
 
@@ -300,14 +326,19 @@ export class RoomsSidePanelComponent {
   createChannel(type: 'text' | 'voice') {
     this.createChannelType.set(type);
     this.newChannelName = '';
+    this.channelNameError.set(null);
     this.showCreateChannelDialog.set(true);
   }
 
   confirmCreateChannel() {
-    const name = this.newChannelName.trim();
+    const name = normalizeChannelName(this.newChannelName);
 
-    if (!name)
+    const validationError = this.getChannelNameError(name);
+
+    if (validationError) {
+      this.channelNameError.set(validationError);
       return;
+    }
 
     const type = this.createChannelType();
     const existing = type === 'text' ? this.textChannels() : this.voiceChannels();
@@ -319,13 +350,35 @@ export class RoomsSidePanelComponent {
     };
 
     this.store.dispatch(RoomsActions.addChannel({ channel }));
+    this.channelNameError.set(null);
     this.showCreateChannelDialog.set(false);
   }
 
   cancelCreateChannel() {
+    this.channelNameError.set(null);
     this.showCreateChannelDialog.set(false);
   }
 
+  clearChannelNameError(): void {
+    if (this.channelNameError()) {
+      this.channelNameError.set(null);
+    }
+  }
+
+  private getChannelNameError(name: string, excludeChannelId?: string): string | null {
+    if (!name) {
+      return 'Channel name is required.';
+    }
+
+    const channels = this.currentRoom()?.channels ?? [];
+
+    if (isChannelNameTaken(channels, name, excludeChannelId)) {
+      return 'Channel names must be unique in a server.';
+    }
+
+    return null;
+  }
+
   openUserContextMenu(evt: MouseEvent, user: User) {
     evt.preventDefault();