import { Injectable } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { WsException } from '@nestjs/websockets';

@Injectable()
export class WsAuthGuard {
  constructor(private jwt: JwtService) {}

  validateClient(client: any, req?: any): { sub: number; email: string } | null {
    try {
      const rawUrl = req?.url || client.url || client._url;
      const url = new URL(rawUrl, 'http://localhost');
      const token = url.searchParams.get('token');
      if (!token) throw new WsException('No token');
      return this.jwt.verify(token) as { sub: number; email: string };
    } catch {
      return null;
    }
  }
}