import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import {
  NavigationEnd,
  Router,
  RouterLink,
  RouterLinkActive,
  RouterOutlet,
} from '@angular/router';
import { filter, map } from 'rxjs';
import { AuthFacade } from '@task-stream/web/identity/application';
import { UserMenuComponent } from '@task-stream/web/identity/presenters';
import { PiIconButtonComponent } from '@pi/ui';
import { AppShellComponent } from '@task-stream/web/shared/ui';
import {
  CommandPalette,
  NotificationsBell,
} from '@task-stream/web/tracker/presenters';

@Component({
  selector: 'ts-root',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [
    RouterOutlet,
    RouterLink,
    RouterLinkActive,
    AppShellComponent,
    UserMenuComponent,
    NotificationsBell,
    CommandPalette,
    PiIconButtonComponent,
  ],
  styles: `
    /* The palette's button, still: same box, so nothing moves when it loads. */
    .ts-shell-search {
      display: inline-flex;
      gap: 0.375rem;
      align-items: center;
      border: 0;
      background: none;
      font: inherit;
      cursor: pointer;
      kbd {
        font-size: 0.6875rem;
        opacity: 0.7;
      }
    }
  `,
  template: `
    <ts-app-shell>
      @if (auth.isAuthenticated()) {
        <a
          shellNav
          class="ts-nav-link"
          routerLink="/"
          routerLinkActive="is-active"
          [routerLinkActiveOptions]="{ exact: true }"
        >
          Proyectos
        </a>
      }
      @if (auth.isAuthenticated()) {
        <a
          shellNav
          class="ts-nav-link"
          routerLink="/portfolio"
          routerLinkActive="is-active"
        >
          Cartera
        </a>
      }
      <a
        shellNav
        class="ts-nav-link"
        routerLink="/explore"
        routerLinkActive="is-active"
      >
        Explorar
      </a>
      @if (auth.isAuthenticated()) {
        <!-- One projectable node per @if branch, or neither reaches the slot. -->
        <ng-container shellUser>
          <!-- Palette and bell load once the page is up: their code and their
               queries stay out of the start. Meanwhile, a still copy. -->
          @defer (on idle; on interaction) {
            <ts-command-palette />
          } @placeholder {
            <button
              type="button"
              class="ts-nav-link ts-shell-search"
              tabindex="-1"
              aria-hidden="true"
            >
              Buscar <kbd>⌘K</kbd>
            </button>
          }
          @defer (on idle; on interaction) {
            <ts-notifications-bell />
          } @placeholder {
            <pi-icon-button
              icon="bell"
              color="grey"
              appearance="ghost"
              aria-label="Notificaciones"
            />
          }
          <ts-user-menu />
        </ng-container>
      } @else if (auth.settled() && !onLogin()) {
        <a shellUser class="ts-nav-link ts-nav-link--cta" routerLink="/login"
          >Iniciar sesión</a
        >
      }
      <router-outlet />
    </ts-app-shell>
  `,
})
export class App {
  protected readonly auth = inject(AuthFacade);
  private readonly router = inject(Router);
  /** The login page has its own form: no "Iniciar sesión" button there. */
  protected readonly onLogin = toSignal(
    this.router.events.pipe(
      filter((event) => event instanceof NavigationEnd),
      map(() => this.router.url.startsWith('/login')),
    ),
    { initialValue: false },
  );
}