import * as ReactDOMServer from 'react-dom/server';
import cookie from 'cookie';

// import our main App component
import App from '../../src/App';

import { getLinks } from '../sape';
import { StaticRouter } from 'react-router-dom/server';

const path = require('path');
const fs = require('fs');

const serverRenderer = async (req, res, next) => {

    // point to the html file created by CRA's build tool
    const filePath = path.resolve(__dirname, '..', '..', 'dist', 'index.html');

    // links
    const cookies = cookie.parse(req.headers.cookie || '');

    const links = await getLinks(req.originalUrl, cookies['sape_cookie']);
    fs.readFile(filePath, 'utf8', (err, htmlData) => {
        if (err) {
            console.error('err', err);
            return res.status(404).end();
        }

        const routerContext = {};

        const props = {
            footer: links.join(' ')
        };

        // render the app as a string
        const html = ReactDOMServer.renderToString(
            <StaticRouter location={req.baseUrl} context={routerContext}>
                <App {...props} />
            </StaticRouter>
        );

        // inject the rendered app into our html and send it
        return res.send(
            htmlData.replace(
                '<div id="app"></div>',
                `<script>window.__PROPS__="${Buffer.from(JSON.stringify(props)).toString('base64')}";</script><div id="app">${html}</div>`
            )
        );
    });
};

export default serverRenderer;