import { createHash, createHmac } from 'crypto';
import type { XiaofeixiaSignType } from '../courier.config';

type SignParams = Record<string, string | number | undefined | null>;

function isEmpty(value: unknown): boolean {
  return value === undefined || value === null || value === '';
}

/** 按 ASCII 字典序拼接并生成签名 */
export function buildXiaofeixiaSign(
  params: SignParams,
  apiKey: string,
  signType: XiaofeixiaSignType = 'MD5',
): string {
  const sortedKeys = Object.keys(params)
    .filter((key) => key !== 'sign' && !isEmpty(params[key]))
    .sort();

  const stringA = sortedKeys.map((key) => `${key}=${params[key]}`).join('&');
  const stringSignTemp = `${stringA}&key=${apiKey}`;

  if (signType === 'HMAC-SHA256') {
    return createHmac('sha256', apiKey).update(stringSignTemp).digest('hex').toUpperCase();
  }

  return createHash('md5').update(stringSignTemp).digest('hex').toUpperCase();
}