source: Farmatiko/ClientApp/src/app/login/login.component.ts

import { Component, OnInit, OnDestroy } from '@angular/core';
import { FormGroup, FormControl, Validators } from '@angular/forms';
import { Router, ActivatedRoute } from '@angular/router';
import { Subscription } from 'rxjs';
import { first } from 'rxjs/operators';
import { AuthService } from '../shared/services/auth.service';
import { finalize } from 'rxjs/operators';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.css']
})
export class LoginComponent implements OnInit, OnDestroy {
  busy = false;
  loginForm: FormGroup;
  username = '';
  password = '';
  loginError = false;
  expanded = false;
  private subscription: Subscription;

  constructor(private authService: AuthService,private router: Router, private route: ActivatedRoute) {
    this.loginForm = new FormGroup({
      username: new FormControl('', [Validators.required, Validators.email]),
      password: new FormControl('', [Validators.required])
    });
  }
  ngOnDestroy(): void {
    this.subscription?.unsubscribe();
  }

  ngOnInit(): void {
    this.subscription = this.authService.user$.subscribe((x) => {
      if (this.route.snapshot.url[0].path === 'login') {
        const accessToken = localStorage.getItem('access_token');
        const refreshToken = localStorage.getItem('refresh_token');
        if (x && accessToken && refreshToken) {
          const returnUrl = this.route.snapshot.queryParams['returnUrl'] || '';
          this.router.navigate([returnUrl]);
        }
      }
    });
  }

  loginPharmacyHead() {
    if (!this.username || !this.password) {
      return;
    }
    this.busy = true;
    const returnUrl = this.route.snapshot.queryParams['returnUrl'] || '';
    this.authService
      .login(this.username, this.password)
      .pipe(finalize(() => (this.busy = false)))
      .subscribe(
        (data) => {
          if(data.role === 'Admin') {
            this.router.navigate(['/admin']);
          }
          else {
            this.router.navigate(['/dashboard']);
          }
        },
        () => {
          this.loginError = true;
        }
      );
    this.loginForm.reset();
  }

  expandRegistration() {
    this.expanded = !this.expanded;
  }
}