import { Component, OnInit, ViewChild, AfterViewInit } from "@angular/core";
import { Router, ActivatedRoute } from "@angular/router";
import { FormBuilder, FormGroup, Validators } from "@angular/forms";
import { MatInput } from "@angular/material/input";

import { first } from "rxjs/operators";

import { AuthenticationService } from "../../services/authentication.service";
import { TranslateModule } from "@ngx-translate/core";

@Component({
  selector: "app-login-user",
  templateUrl: "./login-user.component.html",
  styleUrls: ["./login-user.component.css"],
  imports: [TranslateModule],
})
export class LoginUserComponent implements OnInit, AfterViewInit {
  loginForm: FormGroup;
  loading = false;
  submitted = false;
  returnUrl: string;
  error = "";
  @ViewChild("username") userNameInput: MatInput;

  constructor(
    private formBuilder: FormBuilder,
    private route: ActivatedRoute,
    private router: Router,
    private authenticationService: AuthenticationService
  ) {
    if (this.authenticationService.currentUserValue) {
      this.router.navigate(["/"]);
    }
  }

  ngAfterViewInit() {
    this.userNameInput.focus();
  }

  ngOnInit() {
    this.loginForm = this.formBuilder.group(
      {
        username: ["", [Validators.required, Validators.minLength(3)]],
        password: ["", [Validators.required]],
      },
      { updateOn: "submit" }
    );

    // get return url from route parameters or default to '/'
    this.returnUrl = this.route.snapshot.queryParams["returnUrl"] || "/";
  }

  get formCtrls() {
    return this.loginForm.controls;
  }

  onLoginSubmit() {
    this.submitted = true;

    if (this.loginForm.valid) {
      this.loading = true;
      this.authenticationService
        .login(
          this.formCtrls["username"].value,
          this.formCtrls["password"].value
        )
        .pipe(first())
        .subscribe(
          (data) => {
            this.router.navigate([this.returnUrl]);
          },
          (error) => {
            this.error = error;
            this.loading = false;
          }
        );
    }
  }
}