import { Injectable, Optional } from '@angular/core';
import { Store } from '@ngrx/store';
import { Observable } from 'rxjs';
import { UserIdService } from '../../auth/user-auth/facade/user-id.service';
import { Title, User } from '../../model/misc.model';
import { StateWithProcess } from '../../process/store/process-state';
import { StateWithUser } from '../store/user-state';
import {
  UserAccountFacadeTransitionalToken,
  UserProfileFacadeTransitionalToken,
} from '../user-transitional-tokens';

@Injectable({ providedIn: 'root' })
export class UserService {
  constructor(
    protected store: Store<StateWithUser | StateWithProcess<void>>,
    protected userIdService: UserIdService,
    // TODO: Remove transitional tokens in 4.0 with #11607
    @Optional()
    protected userAccountFacade?: UserAccountFacadeTransitionalToken,
    @Optional()
    protected userProfileFacade?: UserProfileFacadeTransitionalToken
  ) {}

  /**
   * Returns a user.
   *
   * @deprecated since 3.2, use `UserAccountFacade.get()` from `@spartacus/user` package.
   */
  get(): Observable<User | undefined> {
    if (this.userAccountFacade) {
      return this.userAccountFacade.get();
    }
    throw Error(
      'Cannot get a user. Install `@spartacus/user` library which provides required services.'
    );
  }

  /**
   * Returns titles.
   *
   * @deprecated since 3.2, use `UserProfileFacade.getTitles()` from `@spartacus/user` package.
   */
  getTitles(): Observable<Title[]> {
    if (this.userProfileFacade) {
      return this.userProfileFacade.getTitles();
    }
    throw Error(
      'Cannot get a titles. Install `@spartacus/user` library which provides required services.'
    );
  }
}