import { CommonModule } from '@angular/common';
import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { ActivatedRoute, Router } from '@angular/router';
import { Eye, EyeOff, LoaderCircle, LockKeyhole, LucideAngularModule, ShieldCheck, UserRound } from 'lucide-angular';
import { AdminSessionService } from '../admin-session.service';
import { CloudFunctionsService } from '../cloud-functions.service';

@Component({
  selector: 'app-admin-login',
  standalone: true,
  imports: [CommonModule, FormsModule, LucideAngularModule],
  templateUrl: './admin-login.component.html',
  styleUrl: './admin-login.component.scss',
  changeDetection: ChangeDetectionStrategy.OnPush,
})
export class AdminLoginComponent {
  username = '';
  password = '';
  readonly showPassword = signal(false);
  readonly loading = signal(false);
  readonly error = signal('');
  readonly icons = { Eye, EyeOff, LoaderCircle, LockKeyhole, ShieldCheck, UserRound };

  private readonly sessions = inject(AdminSessionService);
  private readonly functions = inject(CloudFunctionsService);
  private readonly router = inject(Router);
  private readonly route = inject(ActivatedRoute);

  constructor() { document.title = '后台登录 · 小树陪练'; }

  async submit(): Promise<void> {
    if (!this.username.trim() || !this.password) {
      this.error.set('请输入管理员账号和密码');
      return;
    }
    this.loading.set(true);
    this.error.set('');
    try {
      await this.sessions.login(this.username, this.password);
      await this.functions.admin('meta');
      const returnUrl = this.route.snapshot.queryParamMap.get('returnUrl') || '/admin/dashboard';
      await this.router.navigateByUrl(returnUrl);
    } catch (error) {
      this.sessions.logout(false);
      this.error.set(error instanceof Error ? error.message : '登录失败');
    } finally {
      this.loading.set(false);
    }
  }
}