import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, Router, RouterStateSnapshot } from '@angular/router';
import { Observable } from 'rxjs';
import { map, tap } from 'rxjs/operators';

import { GrpcAuthService } from '../services/grpc-auth.service';

@Injectable({
  providedIn: 'root',
})
export class UserGuard {
  constructor(private authService: GrpcAuthService, private router: Router) {}

  public canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot,
  ): Observable<boolean> | Promise<boolean> | boolean {
    return this.authService.user.pipe(
      map((user) => user?.id !== route.params['id']),
      tap((isNotMe) => {
        if (!isNotMe) {
          this.router.navigate(['/users', 'me']);
        }
      }),
    );
  }
}