/**
 * @CurrentUser 参数装饰器 - 从 request 中提取已认证用户信息
 */
import { createParamDecorator, ExecutionContext } from '@nestjs/common';
import type { Request } from 'express';

export interface JwtPayload {
  sub: string; // userId
  email: string;
  role: string; // user | admin
}

export const CurrentUser = createParamDecorator(
  (_data: unknown, ctx: ExecutionContext): JwtPayload => {
    const request = ctx.switchToHttp().getRequest<Request>();
    const user = request['user'];
    if (!user) {
      throw new Error('CurrentUser decorator used without JWT guard');
    }
    return user as JwtPayload;
  },
);