/*
 * This file is part of the authRXBN single sign-on package.
 *
 * (c) Ruben Meyer <contact@rxbn.de>
 */

// init
var methods = {};

/**
 * start web server
 * @author Ruben Meyer
 * @return {Void}
 */
methods.start = () => {
	// init express framework
	let express = require('express');
	let session_handler = require('express-session');

	// utilities
	let fs = require('fs');
	let path = require('path');
	let mime = require('mime-types');

	// app variable
	let app = express();
	app.set('view engine', 'pug'); // page engine
	app.set('views', global['__dirname']+'/bin/web/views');

	let bp = require('body-parser'); // POST Body parser
	let cp = require('cookie-parser'); // Cookie handler

	// Access Control Headers
	app.use( (req, res, next) => {
		res.set({
			'X-Powered-By': global['gds'].cfg
		});
		res.header("Access-Control-Allow-Origin", "*");
		res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
		next();
	});

	//static files
	app.use('/res', (req, res, next) => {
		if(typeof global['gds'].cache.web == 'undefined') global['gds'].cache.web = {};

		let dir = global['__dirname'] + '/res/web';
		let joined_path = path.join(dir, /^[^?]+/.exec(req.url)[0]);

		// path already cached; not exist
		if(global['gds'].cache.web[joined_path] == false) {
			res.status(404).end();
		// path already cached; exist
		} else if(global['gds'].cache.web[joined_path] == true){
			let contentType = mime.contentType(path.extname(joined_path));
			res.setHeader('Content-Type', contentType);
			fs.createReadStream(joined_path).pipe(res);
		// check path
		} else {
			fs.exists(joined_path, (exists) => {
				global['gds'].cache.web[joined_path] = exists;
				if(exists) {
					let contentType = mime.contentType(path.extname(joined_path));
					res.setHeader('Content-Type', contentType);

					fs.createReadStream(joined_path).pipe(res);
				} else {
					res.status(404).end();
				}
			});
		}
	});

	// BodyParser & CookieParser
	app.use(bp.json());
	app.use(bp.urlencoded({
		extended: true
	}));
	app.use(cp(global['gds'].cfg.web.cookieKey));

	// Sessions
	session_options = {
		secret: global['gds'].cfg.web.sessionKey,
		resave: false,
		saveUninitialized: false, cookie: {}};
	if(app.get('env') === 'production') {
		session_options.cookie.secure = true;
	}
	app.use(session_handler(session_options));

	// web routes
	app.use('/', require(global['__dirname']+'/bin/web/routes/static'));
	app.use('/api', require(global['__dirname']+'/bin/web/routes/api'));

	// start server
	app.listen(global['gds'].cfg.web.port, () => {
		global['modules'].logs.log("Server is listening on port: "+global['gds'].cfg.web.port);
	});
};

module.exports = methods;