CUB-51: Implement Quick-Jump Drawer Component

frontend/src/app/components/quick-jump-drawer/quick-jump-drawer.component.ts

@@ -0,0 +1,215 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  ElementRef,
+  EventEmitter,
+  HostListener,
+  OnDestroy,
+  Output,
+  signal,
+  ViewChild,
+} from '@angular/core';
+import { FormControl, ReactiveFormsModule } from '@angular/forms';
+import { Subject, takeUntil } from 'rxjs';
+import { AgentCardData } from '../../models/agent.model';
+import { AgentStatusService } from '../../services/agent-status.service';
+
+@Component({
+  selector: 'app-quick-jump-drawer',
+  standalone: true,
+  imports: [ReactiveFormsModule],
+  templateUrl: './quick-jump-drawer.component.html',
+  styleUrl: './quick-jump-drawer.component.scss',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class QuickJumpDrawerComponent implements OnDestroy {
+  /** Emits when the drawer should close (ESC, outside click, or item select). */
+  @Output() readonly drawerClose = new EventEmitter<void>();
+
+  /** Whether the drawer is visible. */
+  readonly isOpen = signal(false);
+
+  /** Search/filter input control. */
+  readonly searchControl = new FormControl('', { nonNullable: true });
+
+  /** Filtered agent list based on search. */
+  readonly filteredAgents = signal<AgentCardData[]>([]);
+
+  /** Track which agent row is highlighted via keyboard navigation. */
+  readonly highlightedIndex = signal(-1);
+
+  @ViewChild('searchInput') searchInput!: ElementRef<HTMLInputElement>;
+  @ViewChild('drawerPanel') drawerPanel!: ElementRef<HTMLElement>;
+
+  private readonly destroy$ = new Subject<void>();
+
+  constructor(private readonly agentStatusService: AgentStatusService) {
+    // Reactively filter agents as the search input changes
+    this.searchControl.valueChanges
+      .pipe(takeUntil(this.destroy$))
+      .subscribe((query) => this.filterAgents(query));
+
+    // Initial load
+    this.filterAgents('');
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public API
+  // ---------------------------------------------------------------------------
+
+  /** Open the drawer and focus the search input. */
+  open(): void {
+    this.isOpen.set(true);
+    this.searchControl.setValue('', { emitEvent: false });
+    this.highlightedIndex.set(-1);
+    // Focus search input after animation frame (drawer needs to render first)
+    requestAnimationFrame(() => {
+      this.searchInput?.nativeElement?.focus();
+    });
+  }
+
+  /** Close the drawer. */
+  close(): void {
+    this.isOpen.set(false);
+    this.searchControl.setValue('', { emitEvent: false });
+    this.highlightedIndex.set(-1);
+    this.drawerClose.emit();
+  }
+
+  /** Toggle the drawer open/close. */
+  toggle(): void {
+    if (this.isOpen()) {
+      this.close();
+    } else {
+      this.open();
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Keyboard Handling
+  // ---------------------------------------------------------------------------
+
+  @HostListener('document:keydown.escape')
+  onEscapeKey(): void {
+    if (this.isOpen()) {
+      this.close();
+    }
+  }
+
+  /** Handle keyboard navigation within the drawer panel. */
+  onDrawerKeydown(event: KeyboardEvent): void {
+    const agents = this.filteredAgents();
+    if (!agents.length) return;
+
+    switch (event.key) {
+      case 'ArrowDown': {
+        event.preventDefault();
+        this.highlightedIndex.update((i) =>
+          i < agents.length - 1 ? i + 1 : 0
+        );
+        this.scrollIntoView();
+        break;
+      }
+      case 'ArrowUp': {
+        event.preventDefault();
+        this.highlightedIndex.update((i) =>
+          i > 0 ? i - 1 : agents.length - 1
+        );
+        this.scrollIntoView();
+        break;
+      }
+      case 'Enter': {
+        const idx = this.highlightedIndex();
+        if (idx >= 0 && idx < agents.length) {
+          this.selectAgent(agents[idx]);
+        }
+        break;
+      }
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Outside Click
+  // ---------------------------------------------------------------------------
+
+  /** Close when clicking on the backdrop (outside the panel). */
+  onBackdropClick(event: MouseEvent): void {
+    if (
+      this.drawerPanel?.nativeElement &&
+      !this.drawerPanel.nativeElement.contains(event.target as Node)
+    ) {
+      this.close();
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Agent Selection
+  // ---------------------------------------------------------------------------
+
+  /** Select an agent — navigates or focuses the agent card. */
+  selectAgent(agent: AgentCardData): void {
+    // TODO: Wire up navigation to the selected agent's detail view
+    // For now, emit close after selection
+    console.log('[QuickJump] Selected agent:', agent.id);
+    this.close();
+  }
+
+  // ---------------------------------------------------------------------------
+  // Status Helpers
+  // ---------------------------------------------------------------------------
+
+  /** Get the CSS class for a given agent status. */
+  getStatusClass(status: string): string {
+    return `status-dot--${status}`;
+  }
+
+  /** Get a human-readable label for an agent status. */
+  getStatusLabel(status: string): string {
+    const labels: Record<string, string> = {
+      active: 'Active',
+      idle: 'Idle',
+      thinking: 'Thinking',
+      error: 'Error',
+      offline: 'Offline',
+    };
+    return labels[status] ?? status;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Lifecycle
+  // ---------------------------------------------------------------------------
+
+  ngOnDestroy(): void {
+    this.destroy$.next();
+    this.destroy$.complete();
+  }
+
+  // ---------------------------------------------------------------------------
+  // Private
+  // ---------------------------------------------------------------------------
+
+  private filterAgents(query: string): void {
+    const allAgents = this.agentStatusService.agents();
+    const lowerQuery = query.toLowerCase().trim();
+
+    if (!lowerQuery) {
+      this.filteredAgents.set(allAgents);
+      return;
+    }
+
+    const filtered = allAgents.filter(
+      (agent) =>
+        agent.displayName.toLowerCase().includes(lowerQuery) ||
+        agent.id.toLowerCase().includes(lowerQuery) ||
+        agent.role.toLowerCase().includes(lowerQuery)
+    );
+    this.filteredAgents.set(filtered);
+    this.highlightedIndex.set(-1);
+  }
+
+  private scrollIntoView(): void {
+    const idx = this.highlightedIndex();
+    const el = document.getElementById(`quick-jump-agent-${idx}`);
+    el?.scrollIntoView({ block: 'nearest', behavior: 'smooth' });
+  }
+}