'use strict'

var
    fs = require('fs'),
    url = require('url'),
    path = require('path'),
    http = require('http');

var root = path.resolve(process.argv[2] || './file_server');

console.log('Static root dir: ' + root);

var server = http.createServer(function(request, response) {
    var pathName = url.parse(request.url).pathname;
    var filePath = path.join(root, pathName);
    var defaultPage = ['/index.html', '/default.html'];
    var filePathWithDefault = false;

    fs.stat(filePath, function(err, stats) {
        if (err) {
            console.log('404' + request.url);
            response.writeHead(404);
            response.end('404 Not Found');
        } else if (stats.isFile()){
            console.log('200', request.url);
            response.writeHead(200);

            fs.createReadStream(filePath).pipe(response);
        } else if (stats.isDirectory()){
            for(let i=0; i<defaultPage.length; i++) {
                filePath = path.join(root, defaultPage[i]);

                try {
                    fs.statSync(filePath);
                    fs.createReadStream(filePath).pipe(response);
                    filePathWithDefault = true;
                } catch(e) {
                    filePathWithDefault = false;
                }
                if (filePathWithDefault) break;
            }
        }
        if (!filePathWithDefault) {
            console.log('404' + request.url);
            response.writeHead(404);
            response.end('404 Not Found');
        }
    });
});

server.listen(8080);

console.log('Server is running on http://127.0.0.1:8080');