import {
  CanActivate,
  ExecutionContext,
  Inject,
  Injectable,
} from '@nestjs/common';
import { ClientProxy } from '@nestjs/microservices';
import { Request, Response } from 'express';
import { lastValueFrom } from 'rxjs';

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(@Inject('auth') private authClient: ClientProxy) {}

  async canActivate(context: ExecutionContext): Promise<boolean> {
    const request = context.switchToHttp().getRequest() as Request;
    const response = context.switchToHttp().getResponse() as Response;
    if (!request.headers.authorization) return false;

    // Verify token by auth microservice
    const [, token] = request.headers.authorization.split(' ');
    const user = await lastValueFrom(
      this.authClient.send('auth.verify', { token }),
    );

    // Add token contents to locals
    response.locals.user = user;
    return true;
  }
}