import {Injectable} from '@angular/core';
import {ActivatedRouteSnapshot, CanActivate, CanLoad, Route, Router, RouterStateSnapshot} from '@angular/router';
import {Observable} from 'rxjs/Observable';
import {Session} from './utils/helper.class';
import {LoginErrorCodes} from './utils/guardHelper.class';
import {filter, map} from "rxjs/operators";
import {UserManagementService} from "../services/user-management.service";

@Injectable()
export class LoginGuard implements CanActivate, CanLoad {
  
  constructor(private router: Router,
              private userManagementService: UserManagementService) {
  }
  
  check(path: string): Observable<boolean> | boolean {
    if (Session.isLoggedIn()) {
      const obs = this.userManagementService.getUserInfo(false).pipe(map(user => {
        return user !== null;
      }));
      obs.pipe(filter(isLoggedIn => !isLoggedIn)).subscribe(() => {
        this.router.navigate(['/user-info'], {queryParams: {'errorCode': LoginErrorCodes.NOT_LOGIN, path}});
      });
      return obs;
    } else {
      this.router.navigate(['/user-info'], {queryParams: {'errorCode': LoginErrorCodes.NOT_LOGIN, path}});
      return false;
    }
  }
  
  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> | boolean {
    return this.check(state.url);
  }
  
  canLoad(route: Route): Observable<boolean> | Promise<boolean> | boolean {
    return this.check('/' + route.path);
  }
}