import { AuthService, User, UserRole } from './auth.service';
import { inject, Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, CanActivate } from '@angular/router';
import { MatDialog } from '@angular/material/dialog';
import { LoginDialog } from './login/login.dialog';
import { firstValueFrom } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class AuthGuard implements CanActivate {

  private auth = inject(AuthService);
  private dialog = inject(MatDialog);

  async canActivate(route: ActivatedRouteSnapshot): Promise<boolean> {
    const allowedRoles: UserRole[] = route.data['roles'];

    if (!allowedRoles || allowedRoles.length === 0) {
      throw new Error('Keine erlaubten Rollen für diese Route definiert.');
    }

    const currentUser = this.auth.user()
    if (currentUser && allowedRoles.includes(currentUser.role)) {
      return true;
    }

    const roleToLogin = allowedRoles[0]; // Standardmäßig erste Rolle auswählen

    const user: User | null = this.auth.getUserDataByRole(roleToLogin);
    if (!user) {
      throw new Error(`Ungültige Rolle: ${roleToLogin}`);
    }

    const dialogRef = this.dialog.open(LoginDialog, {
      disableClose: true,
      backdropClass: 'backdropBackground',
      data: { user },
    });

    const result = await firstValueFrom(dialogRef.afterClosed());

    return result === true
  }
}