import { Injectable, CanActivate, ExecutionContext } from '@nestjs/common';
import { Observable } from 'rxjs';
import type { Response, Request } from 'express';

@Injectable()
export class AuthGuard implements CanActivate {
  canActivate(
    context: ExecutionContext,
  ): boolean | Promise<boolean> | Observable<boolean> {
    const request = context.switchToHttp().getRequest<Request>();
    const response = context.switchToHttp().getResponse<Response>();
    const authHeader = request.header('Authorization');
    if (!authHeader) return true; // false;
    const [, token] = authHeader.split(' ');
    if (!token) return true; // false
    // Validate `token` JWT here
    response.locals.token = token;
    return true;
  }
}