import { LoaderStore } from './../stores/loader.store';
import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot } from '@angular/router';
import { JwtHelperService } from '@auth0/angular-jwt';
import { JWT_KEY } from '../app.constants';
import { IJwt } from '../models/i-jwt.model';
import { StorageService } from '../services';
import { AuthService } from '../services/auth.service';
import { ErrorStore, SessionStore } from '../stores';
import { Session } from '../models';
import { map, first } from 'rxjs/operators';

interface IHaveToken {
  token: string;
}

@Injectable()
export class SsoGuard implements CanActivate {
  constructor(
    private router: Router,
    private authService: AuthService,
    private helper: JwtHelperService,
    private sessionStore: SessionStore,
    private storage: StorageService,
    private errors: ErrorStore,
    private loader: LoaderStore
  ) {}

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
    this.loader.show();
    console.log('sso guard activated');
    const params = route.queryParams as IHaveToken;
    if (!this.hasToken(params.token) || this.helper.isTokenExpired(params.token)) {
      return true;
    }
    if (this.authService.authenticated) {
      console.log('sso guard authenticated: clear current session');
      this.storage.delete(JWT_KEY);
      this.sessionStore.clearSession();
    }
    this.storage.set(JWT_KEY, params.token);
    const jwt = this.helper.decodeToken(params.token) as IJwt;
    this.sessionStore.createSession(jwt);
    return this.sessionStore.session$.pipe(
      first((session) => !!session && !!session.accounts),
      map((session) => {
        if (!this.hasContactMethods(session)) {
          return this.showContactMethodError();
        }
        return this.goToStart();
      })
    );
  }

  private showContactMethodError() {
    this.errors.addError(
      'You are missing the necessary contact information to use this feature.',
      'Please contact your financial institution.'
    );
    this.errors.displayErrors();
    return false;
  }

  private hasContactMethods(session: Session): boolean {
    if (session.email.length === 0 && session.phones.length === 0) {
      return false;
    }
    return true;
  }

  private goToStart(): boolean {
    this.router.navigate(['/']);
    return false;
  }

  private hasToken(token: string): boolean {
    return token !== null && token !== undefined && token.length > 0;
  }
}