import fs from 'fs';
import http from 'http';
import path from 'path';

const port = 8080;

const server = http.createServer((request, response) => {
	const mimeType = {
		'.html': 'text/html',
		'.js': 'text/javascript',
		'.gz': 'application/javascript',
	};
	const mimeEncoding = {
		'.gz': 'gzip',
	};
	let pathname = path.join('.', request.url);

	if(!fs.existsSync(pathname))
	{
		// If the file is not found, return 404
		response.statusCode = 404;
		response.end(`File ${pathname} not found!`);
		return;
	}
	// If is a directory, then look for index.html
	if (fs.statSync(pathname).isDirectory()) {
		pathname =  path.join(pathname, 'index.html');
	}
	// Read file from file system
	fs.readFile(pathname, function(error, data){
		if(error)
		{
			response.statusCode = 500;
			response.end(`Error getting the file: ${error}.`);
		}
		else
		{
			// Based on the URL path, extract the file extention. e.g. .js, .doc, ...
			const extension = path.parse(pathname).ext;
			// Set Content-Type
			response.setHeader('Content-Type', mimeType[extension] || 'text/plain' );
			// If the file is found, set Content-Encoding
			if(mimeEncoding[extension])
			{
				response.setHeader('Content-Encoding', mimeEncoding[extension]);
			}
			response.end(data);
		}
	});
});

server.listen(port, (error) => {
	if (error)
		return console.log(`Server cannot listen port ${port} :`, error);
	console.log(`Server is listening on port ${port}`);
});

const exit = () => {
	server.close();
	console.log('Server stopped');
};

process.on('SIGINT', () => {
	process.stdout.write('\r  \r');
	exit();
});