import {
  filter,
  map,
  Observable,
  take
} from 'rxjs';

import { UsersActions } from '../../../../store/users/users.actions';
import type { User } from '../../../../shared-kernel';

export type AuthenticationOutcome =
  | { kind: 'success'; user: User }
  | { kind: 'failure'; error: string };

export function waitForAuthenticationOutcome(
  actions$: Observable<{ type: string; user?: User; error?: string }>
): Observable<AuthenticationOutcome> {
  return actions$.pipe(
    filter((action) =>
      action.type === UsersActions.setCurrentUser.type
      || action.type === UsersActions.loadCurrentUserFailure.type
    ),
    take(1),
    map((action) => {
      if (action.type === UsersActions.loadCurrentUserFailure.type) {
        return {
          kind: 'failure' as const,
          error: action.error || 'Authentication failed'
        };
      }

      if (!action.user) {
        return {
          kind: 'failure' as const,
          error: 'Authentication failed'
        };
      }

      return {
        kind: 'success' as const,
        user: action.user
      };
    })
  );
}