server.js

const Koa = require('koa');
const pug = require('pug');
const path = require('path');
const Router = require('koa-router');
const mongoose = require('mongoose')
const sendMessage = require('./sendMessage');
const search = require('./wikipedia');
const config = require('./config');
const logger = require('./logger');
const History = require('./History');


const app = new Koa();
const router = new Router();

app.use(require('koa-bodyparser')());

router.post(`/${config.bot_token}`, async (ctx, next) => {
    try {
        const {message: {text, chat: {id: chatId}, from: {id: userId}}} = ctx.request.body;

        if(text === '/history') {
            const entities = await History.find({ user: userId })
                .sort({ createdAt: -1})
                .limit(10)

            const history = entities.map(entity => `${entity.text}`)

            await sendMessage (chatId, history.join('\n'));

            ctx.body = 'ok';

            return;
        }

        await History.create({
            user: userId,
            text,
            createdAt: Date.now()
        });

        const results = await search (text);

        const msg = pug.renderFile (path.join (__dirname, 'message.pug'), {
            results,
        })

        await sendMessage (chatId, msg, 'HTML');

    } catch (err) {
        logger.error(err)
    }

    ctx.body = 'ok';
})

app.use(router.routes());

mongoose.connect(config.mongodb_uri);

app.listen(config.port);