'use strict';
  
  const express = require('express');
  
  const modem = require('../modem');
  
  const router = express.Router();
  module.exports = router;

  /**
   * Eksekusi kode USSD
   * @param  {object} req - Objek request Express

   *
   * Pilihan req.query.include_cusd2:

   * -1: sebelum

   * 0: tidak (default)
   * 1: sesudah

   * 2: sebelum dan sesudah

   *

   * @param  {object} req.query - Objek query string request Express
   * @param  {string} req.query.code - Kode USSD yang ingin dieksekusi

   * @param  {number} [req.query.include_cusd2=0] - Apakah ingin mengeksekusi CUSD=2 secara otomatis

   * @param  {object} res - Objek respon Express
   */

  async function handlerIndex(req, res) {

      if (!req.query || !req.query.code || typeof req.query.code !== 'string') {

          res.json({
              status: 'NOT-OK',
              error: 'INVALID-PARAMETER',
              message: 'Undefined parameter: code',
          });

  
          return;

      }

      const reply = await modem.executeUSSD(req.query.code, Number(req.query.include_cusd2));

      res.json({
          status: 'OK',
          error: false,

          code: req.query.code,

          include_cusd2: Number(req.query.include_cusd2) || 0,

          message: reply,

      });
  }
  
  router.get('/', handlerIndex);