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

const PORT = 3000;

const server = http.createServer((req, res) => {
    let filePath = '.' + req.url;
    if (filePath == './') {
        filePath = './index.html';
    }

    const extname = path.extname(filePath);
    let contentType = 'text/html';
    switch (extname) {
        case '.js':
            contentType = 'text/javascript';
            break;
        case '.css':
            contentType = 'text/css';
            break;
        case '.json':
            contentType = 'application/json';
            break;
        case '.png':
            contentType = 'image/png';
            break;
        case '.jpg':
            contentType = 'image/jpg';
            break;
    }

    fs.readFile(filePath, (error, content) => {
        if (error) {
            if (error.code == 'ENOENT') {
                res.writeHead(404);
                res.end('404 Not Found');
            } else {
                res.writeHead(500);
                res.end('Sorry, check with the site admin for error: ' + error.code + ' ..\n');
            }
        } else {
            res.writeHead(200, { 'Content-Type': contentType });
            res.end(content, 'utf-8');
        }
    });
});

server.listen(PORT, () => {
    console.log(`Server running at http://localhost:${PORT}/`);
});