import { Injectable } from '@angular/core';
import { Result, ok } from '@shared/kernel/fp';
import { parseBsn } from '@shared/kernel/bsn';
import { Session } from '../domain/session';

/** Infrastructure: talks to the (mock) DigiD identity provider. */
@Injectable({ providedIn: 'root' })
export class DigidAdapter {
  // ponytail: fake DigiD — any elfproef-valid BSN authenticates to a fixed identity.
  // Real BSN validation (parseBsn, WP-40) is the trust boundary; swap the fixed identity
  // for a real OIDC redirect flow when there's an IdP.
  async authenticate(bsn: string): Promise<Result<string, Session>> {
    const r = parseBsn(bsn);
    return r.ok ? ok({ bsn: r.value, naam: 'Dr. A. (Anna) de Vries' }) : r;
  }
}