import { Service } from 'egg';
const csprng = require('csprng');
/**
 * Utils Service
 */
export default class Utils extends Service {
  /**
   * 生成 len 长度的随机字符串
   * @param len 长度
   * @param radix 基数
   */
  public generateStr(len: number, radix = 36) {
    return `${csprng(len, radix)}`;
  }

  public genCode(len) {
    const chars = '123456789ABCDEFGHJKLMNPQRSTWXYZabcdefghijklmnopqrstuvwxyz';
    const charArr = chars.split('');
    let code = '';
    for (let i = 0; i < len; i++) {
      code += charArr[Math.floor(Math.random() * charArr.length)];
    }
    return code;
  }

  /**
   * 生成指定长度的随机数
   * @param len 随机数长度
   */
  public generateNum(len: number) {
    let code = '';
    for (let i = 0; i < len; i++) {
      code += parseInt(`${Math.random() * 10}`);
    }
    return code;
  }

  public exceptionResult(status) {
    const { code, simStr } = status;
    return { status: code, data: simStr };
  }
}