import { Component, computed, inject } from '@angular/core';
import { PageShellComponent } from '@shared/layout/page-shell/page-shell.component';
import { AlertComponent } from '@shared/ui/alert/alert.component';
import { ASYNC } from '@shared/ui/async/async.component';
import { map } from '@shared/application/remote-data';
import { BigProfileStore } from '@registratie/application/big-profile.store';
import { isHerregistratieEligible } from '@registratie/domain/registration.policy';
import { HerregistratieWizardComponent } from '@herregistratie/ui/herregistratie-wizard/herregistratie-wizard.component';

/** A whole new page built from existing building blocks. Eligibility is a pure
    domain rule (registration.policy) read from the shared profile state. */
@Component({
  selector: 'app-herregistratie-page',
  imports: [PageShellComponent, AlertComponent, ...ASYNC, HerregistratieWizardComponent],
  template: `
    <app-page-shell heading="Herregistratie aanvragen" backLink="/dashboard">
      <app-async [data]="eligibility()">
        <ng-template appAsyncLoaded let-eligible>
          @if (eligible) {
            <app-alert type="info">
              Uw huidige registratie verloopt binnenkort. Vraag tijdig herregistratie aan.
            </app-alert>
            <div style="margin-top:1.5rem">
              <app-herregistratie-wizard />
            </div>
          } @else {
            <app-alert type="warning">
              Voor uw huidige registratiestatus is herregistratie niet mogelijk.
            </app-alert>
          }
        </ng-template>
      </app-async>
    </app-page-shell>
  `,
})
export class HerregistratiePage {
  private store = inject(BigProfileStore);
  // Derive a boolean RemoteData from the combined profile via map (pure).
  protected eligibility = computed(() =>
    map(this.store.profile(), (p) => isHerregistratieEligible(p.registration, new Date())),
  );
}