import { ChangeDetectionStrategy, Component, inject, input, signal } from '@angular/core'
import { FormControl, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms'
import { Title } from '@angular/platform-browser'
import { RouterLink } from '@angular/router'
import { ApiError, toApiError } from '../../core/api.service'
import { AuthStore } from '../../core/auth.store'
import { authErrorMessage } from '../../shared/form-errors'
import { FormField } from '../../shared/form-field'

/**
 * Login. `?redirect=` (validato in core/redirect.ts) indica dove tornare: una pagina dell'area riservata
 * o del sito pubblico (es. `/checkout`). `?scaduta=1` = sessione persa durante l'uso;
 * `?account=disattivato` = account appena disattivato dall'utente.
 */
@Component({
  selector: 'app-login',
  imports: [ReactiveFormsModule, RouterLink, FormField],
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <h1>Accedi</h1>
    @if (account() === 'disattivato') {
      <p class="alert alert--success" role="status">
        Il tuo account è stato disattivato e la richiesta di cancellazione è stata inviata. Grazie per averci scelto.
      </p>
    }
    @if (scaduta()) {
      <p class="alert" role="status">La sessione è scaduta: accedi di nuovo per continuare.</p>
    }
    @if (error(); as message) {
      <p class="alert alert--error" role="alert">{{ message }}</p>
    }
    <form [formGroup]="form" (ngSubmit)="submit()" novalidate>
      <div class="form-grid single">
        <app-form-field [control]="form.controls.email" label="Email" type="email" autocomplete="email" [submitted]="submitted()" />
        <app-form-field
          [control]="form.controls.password"
          label="Password"
          type="password"
          autocomplete="current-password"
          [submitted]="submitted()"
        />
      </div>
      <p class="forgot"><a routerLink="/forgot-password">Password dimenticata?</a></p>
      <button type="submit" class="btn btn--primary btn--block" [disabled]="busy()">
        {{ busy() ? 'Accesso in corso…' : 'Accedi' }}
      </button>
    </form>
    <p class="switch">
      Non hai un account?
      <a routerLink="/registrazione" [queryParams]="{ redirect: redirect() || null }">Registrati</a>
    </p>
  `,
  styles: `
    .single {
      grid-template-columns: 1fr;
    }
    .forgot {
      margin: var(--space-2) 0 var(--space-5);
      text-align: right;
    }
    .switch {
      margin: var(--space-5) 0 0;
      text-align: center;
    }
  `,
})
export default class Login {
  private readonly auth = inject(AuthStore)

  readonly redirect = input<string>()
  readonly scaduta = input<string>()
  /** `disattivato` dopo la richiesta di cancellazione dell'account. */
  readonly account = input<string>()

  protected readonly form = new FormGroup({
    email: new FormControl('', { nonNullable: true, validators: [Validators.required, Validators.email] }),
    password: new FormControl('', { nonNullable: true, validators: [Validators.required] }),
  })
  protected readonly submitted = signal(false)
  protected readonly busy = signal(false)
  protected readonly error = signal<string | null>(null)

  constructor() {
    inject(Title).setTitle('Accedi | Area riservata ITI TECHNOLOGY')
  }

  protected async submit(): Promise<void> {
    this.submitted.set(true)
    this.error.set(null)
    if (this.form.invalid || this.busy()) return
    this.busy.set(true)
    try {
      const { email, password } = this.form.getRawValue()
      await this.auth.login(email.trim(), password)
      await this.auth.navigateAfterLogin(this.redirect() ?? null)
    } catch (err) {
      const error = err instanceof ApiError ? err : toApiError(err)
      this.error.set(error.code === 'INVALID_CREDENTIALS' ? 'Email o password non corretti.' : authErrorMessage(error))
      this.form.controls.password.reset()
    } finally {
      this.busy.set(false)
    }
  }
}