var express = require('express');
const request = require('request');
const TARGET_URL = 'https://api.line.me/v2/bot/message/reply'
const TOKEN = 'P5+e9JkPRckzKu1Fv7ghZl1MfP0wrYwYcgBVzHWe1OHO4Gtv1PIa9BARYqxoAThaXPSf8MyVKcpDE88V5jOnoS4o2xCNcgH9Ne4wcrPuNX6AT4gsfYEz0Y7n/A4+rT4vXHYARK34YPbkzzQbiXiyiQdB04t89/1O/w1cDnyilFU='
const fs = require('fs');
const path = require('path');
const HTTPS = require('https');
const domain = "2020105659.osschatbot.cf"
const sslport = 23023;

//Open API
const STDICT_URL = 'https://stdict.korean.go.kr/api/search.do'
const STDICT_KEY = '14AA284251F616FF2151DBE4CD7B3D4C'

//Webhook
const bodyParser = require('body-parser');
const { json } = require('body-parser');
const { start } = require('repl');
var app = express();
app.use(bodyParser.json());
app.post('/hook', function (req, res) {

  var eventObj = req.body.events[0];
  var source = eventObj.source;
  var message = eventObj.message;

  // request log
  console.log('======================', new Date() ,'======================');
  console.log('[request]', req.body);
  console.log('[request source] ', source);
  console.log('[request message]', message);

  wordchain(eventObj.replyToken, message.text);


  res.sendStatus(200);
});

function wordchain(replyToken, message) {

  let letter = message.slice(-1);

  request.post(
      {
        url: STDICT_URL,
        headers: {
          'Referer': 'https://stdict.korean.go.kr/api/search.do',
          'Content-Type': 'application/x-www-form-urlencoded'
        },
        body: `key=14AA284251F616FF2151DBE4CD7B3D4C&` + `q=${letter}&` + 'req_type=json&' + 'advanced=y&' + 'method=start&' + 'letter_s=2'

      },(error, response, body) => {
          if(!error && response.statusCode == 200) {
              console.log(body);
              const parsedData = JSON.parse(body);
              var nextword = parsedData.channel.item[0].word;
              var word_definition = parsedData.channel.item[0].sense.definition;
  
         

              
              request.post(
                  {
                      url: TARGET_URL,
                      headers: {
                          'Authorization': `Bearer ${TOKEN}`
                      },
                      json: {
                          "replyToken":replyToken,
                          "messages":[
                              {
                                  "type":"text",
                                  "text":nextword
                              },
                              {
                                  "type":"text",
                                  "text":': ' + word_definition
                              }
                          ]
                      }
                  },(error, response, body) => {
                      console.log(body);
                  });
          }
      });

}

//SSL
try {
    const option = {
      ca: fs.readFileSync('/etc/letsencrypt/live/' + domain +'/fullchain.pem'),
      key: fs.readFileSync(path.resolve(process.cwd(), '/etc/letsencrypt/live/' + domain +'/privkey.pem'), 'utf8').toString(),
      cert: fs.readFileSync(path.resolve(process.cwd(), '/etc/letsencrypt/live/' + domain +'/cert.pem'), 'utf8').toString(),
    };
  
    HTTPS.createServer(option, app).listen(sslport, () => {
      console.log(`[HTTPS] Server is started on port ${sslport}`);
    });
  } catch (error) {
    console.log('[HTTPS] HTTPS 오류가 발생하였습니다. HTTPS 서버는 실행되지 않습니다.');
    console.log(error);
  }