var express = require('express');
const request = require('request');
const TARGET_URL = 'https://api.line.me/v2/bot/message/reply'
const TOKEN = '채널 토큰으로 교체 해야 함'

const bodyParser = require('body-parser');
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] ', eventObj.source);
    console.log('[request message]', eventObj.message);

    request.post(
        {
            url: TARGET_URL,
            headers: {
                'Authorization': `Bearer ${TOKEN}`
            },
            json: {
                "replyToken":eventObj.replyToken,
                "messages":[
                    {
                        "type":"text",
                        "text":"Hello, user"
                    },
                    {
                        "type":"text",
                        "text":"May I help you?"
                    }
                ]
            }
        },(error, response, body) => {
            console.log(body)
        });
    

    res.sendStatus(200);
});

var server = app.listen(23023, function () {
        var host = server.address().address
        var port = server.address().port
        console.log("Example app listening at http://%s:%s", host, port)
})