import { CanActivate, ExecutionContext, Injectable } from "@nestjs/common";
import { Reflector } from "@nestjs/core";
import { Observable } from "rxjs";

@Injectable()
export class RolesGuard implements CanActivate {
  constructor(private readonly reflector: Reflector) {}

  canActivate(context: ExecutionContext): boolean | Promise<boolean> | Observable<boolean> {
    const requiredRoles = this.reflector.getAllAndOverride<string[]>('roles', [
      context.getHandler(),
      context.getClass(),
    ]);

    if (!requiredRoles || requiredRoles.length === 0) {
      return true;
    }

    const request = context.switchToHttp().getRequest();
    const user = request.user;
    if (!user || !user.role) {
      return false;
    }
    return requiredRoles.includes(user.role);
  }
}