코드 정리

-var express = require('express');
-var app = express();
+const express = require('express');
+const app = express();
 const line = require('@line/bot-sdk');
 const config = require('./config');
 
+const bodyParser = require('body-parser');
+
+app.use(bodyParser.urlencoded({extended:false}));
+app.use(bodyParser.json());
 //papago api
-var request = require('request');
+const request = require('request');
 
 //번역 api_url
-var translate_api_url = 'https://openapi.naver.com/v1/papago/n2mt';
+const translate_api_url = 'https://openapi.naver.com/v1/papago/n2mt';
 
 //언어감지 api_url
-var languagedetect_api_url = 'https://openapi.naver.com/v1/papago/detectLangs';
+const languagedetect_api_url = 'https://openapi.naver.com/v1/papago/detectLangs';
 
 //eng grammar check
-
-var EnGrammarCheck_api_url = 'https://api.textgears.com/check.php';
-
-
+const textgears =require('textgears');
 
 // create LINE SDK client
 const client = new line.Client(config.line_config);
@@ -25,21 +26,34 @@ const client = new line.Client(config.line_config);
 // about Express itself: https://expressjs.com/
 
 // register a webhook handler with middleware
+
 // about the middleware, please refer to doc
-app.post('/webhook', line.middleware(config.line_config), (req, res) => {
-  Promise
-    .all(req.body.events.map(handleEvent))
-    .then((result) => res.json(result))
-    .catch((err) => {
-      console.error(err);      res.status(200).end();
-    });
+app.post("/webhook", line.middleware(config.line_config), (req, res) => {
+    // res.status(200).end();
+    Promise.all(req.body.events.map(handleEvent)).then(result =>
+        res.json(result)
+    );
 });
 
+const message ={
+    type: 'text',
+    text:'메뉴를 선택해 주세요 \t 1.번역 \t 2. 문법'
+}
+
 function handleEvent(event) {
+
     if (event.type !== 'message' || event.message.type !== 'text' ) {
         // ignore non-text-message event
         return Promise.resolve(null);
     }
+    return client.replyMessage(event.replyToken,message);
+app.post('/message/reply',function(req,res){
+   const msg = req.body;
+
+  switch(msg) {
+      case '번역':
+      case '1':
+
           return new Promise(function(resolve, reject) {
               //언어 감지 option
               var detect_options = {
@@ -50,38 +64,27 @@ function handleEvent(event) {
               //papago 언어 감지
               request.post(detect_options,function(error,response,body){
                   console.log(response.statusCode);
-      if(!error && response.statusCode == 200){
+                  if(!error && response.statusCode == 200) {
                       var detect_body = JSON.parse(response.body);
                       var source = '';
                       var target = '';
-        var result = { type: 'text', text:''};
+                      var result = {type: 'text', text: ''};
 
                       //언어 감지가 제대로 됐는지 확인
                       console.log(detect_body.langCode);
-
-
-app.post('/message',function(req,res){  var msg = req.body.content;
-  console.log('전달받은 메시지: ' +msg);
-
-  var sent ={};
-
-  switch(msg)
-  {
-    case '번역':
-    case '1':
-    if(detect_body.langCode == 'ko'||detect_body.langCode == 'en'){
-      source = detect_body.langCode == 'ko' ? 'ko':'en';
-      target = source == 'ko' ? 'en':'ko';
+                      if (detect_body.langCode == 'ko' || detect_body.langCode == 'en') {
+                          source = detect_body.langCode == 'ko' ? 'ko' : 'en';
+                          target = source == 'ko' ? 'en' : 'ko';
                           //papago 번역 option
                           var options = {
                               url: translate_api_url,
                               // 한국어(source : ko), 영어(target: en), 카톡에서 받는 메시지(text)
-          form: {'source':source, 'target':target, 'text':event.message.text},
+                              form: {'source': source, 'target': target, 'text': event.message.text},
                               headers: config.naver_header
                           };
-      request.post(options, function(error, response, body){
+                          request.post(options, function (error, response, body) {
                               // Translate API Sucess
-          if(!error && response.statusCode == 200){
+                              if (!error && response.statusCode == 200) {
                                   // JSON
                                   var objBody = JSON.parse(response.body);
                                   // Message 잘 찍히는지 확인
@@ -89,29 +92,27 @@ app.post('/message',function(req,res){  var msg = req.body.content;
                                   result.text = objBody.message.result.translatedText;
                                   //console.log(result.text);
                                   //번역된 문장 보내기
-              client.replyMessage(event.replyToken,result).then(resolve).catch(reject);
+                                  client.replyMessage(event.replyToken, result).then(resolve).catch(reject);
                               }
                           });
-}
-     send={
-       'message':{
-         'text': result.text
-       }
                       }
+                  }});
+  });
           break;
           case '문법':
-    case '문법체크':
-    case '2':
-
+              textgears({
+                          key: '9WUGcY6ZayYMphG7',
+                          text: event.message.text,
+                      }).then(res => {
+                          for (const error of res.errors) {
+                              console.log('Bad: %s. Better: %s', error.bad, error.better.join(', '));
+                          }
+                      });
           break;
-
        }
-
-
-
-
 });
-
 }
-});
 
+app.listen(3000, function () {
+    console.log('Linebot listening on port 3000!');
+})