import { inject, Injectable, Signal } from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import { OidcSecurityService } from 'angular-auth-oidc-client';
import { map } from 'rxjs';
import { AuthService } from './auth.service';

/** The subset of the medewerker token the portal reads: Keycloak nests realm roles here. */
interface MedewerkerClaims {
  realm_access?: { roles?: string[] };
}

/** Medewerker-backed AuthService over angular-auth-oidc-client (Keycloak `medewerker` realm). */
@Injectable()
export class MedewerkerAuthService extends AuthService {
  private readonly oidc = inject(OidcSecurityService);

  readonly isAuthenticated: Signal<boolean> = toSignal(
    this.oidc.isAuthenticated$.pipe(map((result) => result.isAuthenticated)),
    { initialValue: false },
  );

  // Staff have no BSN; the abstract surface keeps this present for the shared guard/interceptor.
  readonly bsn: Signal<string | undefined> = toSignal(this.oidc.userData$.pipe(map(() => undefined)), {
    initialValue: undefined,
  });

  override readonly roles: Signal<readonly string[]> = toSignal(
    this.oidc.userData$.pipe(
      map((data) => (data.userData as MedewerkerClaims | null)?.realm_access?.roles ?? []),
    ),
    { initialValue: [] },
  );

  override login(): void {
    this.oidc.authorize();
  }

  override logout(): void {
    this.oidc.logoff().subscribe();
  }
}