import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { AuthService } from 'src/app/services/auth/auth.service';
import { AuthUserDTO } from 'src/app/models/auth/auth-user.dto';
import { Router } from '@angular/router';
import { catchError } from 'rxjs/operators';
import { ErrorDTO } from 'src/app/models/error/error-dto';
import { AuthErrorMessages } from 'src/app/models/auth/auth-error-messages.enum';
import { ServiceErrorCode } from 'src/app/models/error/service-error-code.enum';
import { AuthUserAtrErrors } from 'src/app/models/auth/auth-user-atr-errors';
import { SpinnerService } from 'src/app/services/spinner/spinner.service';
import { ThemeService } from 'src/app/services/theme/theme.service';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {

  loginForm: FormGroup;
  submitted = false;

  authUserAtrErrors: AuthUserAtrErrors;

  constructor(
    private authService: AuthService,
    private formBuilder: FormBuilder,
    private router: Router,
    private spinnerService: SpinnerService,
    private themeService: ThemeService
  ) { }

  ngOnInit(): void {
    this.spinnerService.showSpinner();
    this.authService.isUserLoggedInAsync().then(result => {
      if (result) {
        this.router.navigate(['/home']);
      }

      this.initLoginForm();
      this.resetStateFlags();
      this.spinnerService.hideSpinner();
    });
  }

  resetStateFlags(): void {
    this.authUserAtrErrors = new AuthUserAtrErrors();
  }

  initLoginForm(): void {
    this.loginForm = this.formBuilder.group({
      email: [null, [Validators.required, Validators.email]],
      password: [null, [Validators.required, Validators.minLength(8)]]
    });
  }

  register(): void {
    this.router.navigate(['/auth/register']);
  }

  forgotPassword(): void {
    this.router.navigate(['/auth/forgot-password']);
  }

  login(): void {
    this.submitted = true;
    this.resetStateFlags();

    if (this.loginForm.invalid) {
      return;
    }

    this.spinnerService.showSpinner();
    const user: AuthUserDTO = {
      firstName: '',
      lastName: '',
      eMail: this.loginForm.value.email,
      password: this.loginForm.value.password
    };

    this.authService.login(user)
      .pipe(catchError(error => {
        if (error.error !== null) {
          const err: ErrorDTO = error.error;

          if (err.errorCode === ServiceErrorCode.InvalidData && err.message === AuthErrorMessages.UserIsEmpty) {
            this.authUserAtrErrors.email.required = true;
            this.authUserAtrErrors.password.required = true;
          } else if (err.errorCode === ServiceErrorCode.InvalidUser && err.message === AuthErrorMessages.UserNotFound) {
            this.authUserAtrErrors.email.wrongData = true;
          } else if (err.errorCode === ServiceErrorCode.InvalidUser && err.message === AuthErrorMessages.WrongPassword) {
            this.authUserAtrErrors.password.wrongData = true;
          } else if (err.errorCode === ServiceErrorCode.InvalidUser && err.message === AuthErrorMessages.EMailNotConfirmed) {
            this.authUserAtrErrors.email.notConfirmed = true;
          }
          error.error = null;
        }
        this.spinnerService.hideSpinner();
        throw error;
      }))
      .subscribe(token => {
        this.authService.saveToken(token);
        this.themeService.loadTheme();
        this.themeService.loadMenu();
        this.spinnerService.hideSpinner();
        this.router.navigate(['/home']);
      });
  }

}