import { HttpException } from '@nestjs/common';

export function wecomPluginCaller(req: { headers: Record<string, unknown> }): string {
  const raw = req.headers['x-wecom-userid'] ?? req.headers['userid'];
  const v = Array.isArray(raw) ? raw[0] : raw;
  return String(v || 'plugin').trim() || 'plugin';
}

export function wecomPluginMcpErrorText(e: unknown): string {
  if (e instanceof HttpException) {
    const res = e.getResponse();
    if (typeof res === 'string') return res;
    if (res && typeof res === 'object' && 'message' in res) {
      const message = (res as { message?: string | string[] }).message;
      return Array.isArray(message) ? message.join(', ') : String(message ?? e.message);
    }
    return e.message;
  }
  return e instanceof Error ? e.message : String(e);
}

export function wecomPluginQueryArg(v?: string | number): string | undefined {
  if (v == null) return undefined;
  const s = String(v).trim();
  return s ? s : undefined;
}