apps/api/src/auth/current-user.decorator.ts

import { createParamDecorator, ExecutionContext } from "@nestjs/common";
import { DEMO_USER_ID } from "./demo-user.js";

/**
 * Injects the DB userId from the request (set by ClerkAuthGuard).
 * Falls back to "demo" user id in local dev when no auth is present.
 */
export const CurrentUser = createParamDecorator(
  (_data: unknown, ctx: ExecutionContext): string => {
    const request = ctx.switchToHttp().getRequest<{ userId?: string }>();
    return request.userId ?? DEMO_USER_ID;
  }
);