const express = require('express');
const puppeteer = require('puppeteer');
const request = require('request');
const isBot = require('isbot');
const renderApp = express();
const renderAppPort = 80;
const renderedAppPort = 4200;

renderApp.get('*', (req, res) => {
    const requestUrl = `${req.protocol}://${req.hostname}:${renderedAppPort}${req.originalUrl}`
    const userAgentIsBot = isBot(req.headers['user-agent']);

    if (userAgentIsBot) {
        (async () => {
            const browser = await puppeteer.launch();
            const page = await browser.newPage();
            await page.goto(requestUrl);

            res.send(await page.content());

            await browser.close();
        })();
    } else {
        request({
            method: req.method,
            url: requestUrl
        }, (error, response, body) => {
            res.send(body);
        });
    }
});

renderApp.listen(renderAppPort, () => {
    console.log(`Server listening on ${renderAppPort}`);
});