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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
booleanAttribute,
Component,
input,
OnInit,
output,
signal,
DestroyRef,
inject,
ChangeDetectionStrategy
} from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { FormControl, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms';
import { Link, SiLinkDirective } from '@siemens/element-ng/link';
import { SiLoadingButtonComponent } from '@siemens/element-ng/loading-spinner';
import { SiPasswordToggleComponent } from '@siemens/element-ng/password-toggle';
import { SiTranslatePipe, t } from '@siemens/element-translate-ng/translate';
import { UsernamePassword, UsernameValidationPayload } from '../si-landing-page.model';
/**
* A basic login component that supports both single-step and two-step authentication flows.
*
* This component provides a standard login form with username and password fields.
* It can be configured to work in two-step mode where username validation happens first,
* followed by password entry.
*
* @example
* ```html
* <si-login-basic
* [forgotPasswordLink]="forgotPasswordLink"
* [registerNowLink]="registerNowLink"
* [twoStep]="true"
* [loading]="isLoading"
* (login)="handleLogin($event)"
* (usernameValidation)="handleUsernameValidation($event)">
* </si-login-basic>
* ```
*/
@Component({
selector: 'si-login-basic',
imports: [
ReactiveFormsModule,
SiTranslatePipe,
SiLinkDirective,
SiPasswordToggleComponent,
SiLoadingButtonComponent
],
templateUrl: './si-login-basic.component.html',
styleUrl: './si-login-basic.component.scss',
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiLoginBasicComponent implements OnInit {
private static idCounter = 0;
/**
* Label for username input field.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_LOGIN_BASIC.USERNAME:Username`)
* ```
*/
readonly usernameLabel = input(t(() => $localize`:@@SI_LOGIN_BASIC.USERNAME:Username`));
/**
* Label for password input field.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_LOGIN_BASIC.PASSWORD:Password`)
* ```
*/
readonly passwordLabel = input(t(() => $localize`:@@SI_LOGIN_BASIC.PASSWORD:Password`));
/**
* Config for Forgot Password link.
*/
readonly forgotPasswordLink = input<Link>();
/**
* Text for register now.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_LOGIN_BASIC.REGISTER_NOW_INTRO:Don't have an account?`)
* ```
*/
readonly registerNowIntroText = input(
t(() => $localize`:@@SI_LOGIN_BASIC.REGISTER_NOW_INTRO:Don't have an account?`)
);
/**
* Config for Register Now link.
*/
readonly registerNowLink = input<Link>();
/**
* Label for login button.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_LOGIN_BASIC.LOGIN:Login`)
* ```
*/
readonly loginButtonLabel = input(t(() => $localize`:@@SI_LOGIN_BASIC.LOGIN:Login`));
/**
* Disables the login button.
*
* @defaultValue false
*/
readonly disableLogin = input(false);
/**
* Enables the two-step login flow.
*
* @defaultValue false
*/
readonly twoStep = input(false, { transform: booleanAttribute });
/**
* Indicates whether the login button should show a loading state.
*
* @defaultValue false
*/
readonly loading = input(false);
/**
* Description of back button.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_LOGIN_BASIC.BACK:Back`)
* ```
*/
readonly backButtonLabel = input(t(() => $localize`:@@SI_LOGIN_BASIC.BACK:Back`));
/**
* Description of next button.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_LOGIN_BASIC.NEXT:Next`)
* ```
*/
readonly nextButtonLabel = input(t(() => $localize`:@@SI_LOGIN_BASIC.NEXT:Next`));
/**
* Emits username when user clicks on next button.
*/
readonly usernameValidation = output<UsernameValidationPayload>();
/**
* Emits username and password on value change.
*/
readonly valueChanged = output<UsernamePassword>();
/**
* Emits username and password on login event.
*/
readonly login = output<UsernamePassword>();
private destroyRef = inject(DestroyRef);
protected readonly secondStepVisible = signal(false);
protected readonly loadingNext = signal(false);
private readonly index = SiLoginBasicComponent.idCounter++;
protected usernameId = `__si-login-basic-username-${this.index}`;
protected passwordId = `__si-login-basic-password-${this.index}`;
protected loginCredentials = new FormGroup({
username: new FormControl('', Validators.required),
password: new FormControl('', Validators.required)
});
ngOnInit(): void {
this.loginCredentials.valueChanges.pipe(takeUntilDestroyed(this.destroyRef)).subscribe(() => {
this.handleValueChanges();
});
this.loginCredentials.controls.username.valueChanges
.pipe(takeUntilDestroyed(this.destroyRef))
.subscribe(() => this.secondStepVisible() && this.goBack());
}
protected submit(): void {
Iif (this.twoStep() && !this.secondStepVisible()) {
this.validateUsername();
return;
}
this.login.emit(this.getLoginFormValues());
}
protected handleValueChanges(): void {
this.valueChanged.emit(this.getLoginFormValues());
}
protected validateUsername(): void {
if (this.loginCredentials.controls.username.valid) {
this.loadingNext.set(true);
}
const activateArgs = {
...this.getLoginFormValues(),
validate: (isValid: boolean): void => {
if (isValid) {
this.nextStep();
} else E{
this.loadingNext.set(false);
this.loginCredentials.controls.username.setErrors({ invalid: true });
}
}
};
this.usernameValidation.emit(activateArgs);
}
private getLoginFormValues(): UsernamePassword {
const { username: username, password } = this.loginCredentials.value;
return { username: username, password };
}
protected goBack(): void {
this.secondStepVisible.set(false);
this.loginCredentials.controls.password.reset();
}
private nextStep(): void {
if (this.twoStep() && !this.secondStepVisible()) {
this.loadingNext.set(false);
this.secondStepVisible.set(true);
}
}
}
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