'use strict';

var express  = require('express');
var path     = require('path');
var fs       = require('fs');
var fetch    = require('fetch');
var cors     = require('cors');
var morgan   = require('morgan');

// example options;
var serverUrl = 'http://localhost:8080';
var useInline = true; // or false

var clientResourcesWeb = [];
var clientResources = {
	js: [],
	css: [],
	cssData: []
};

var addClientResource = function(clientResource, resourceType) {
	clientResources[resourceType].push(clientResource);
};

var stringHash = function (str) {
	/* jslint bitwise: true */
	var hash = 31; // prime
	for (var i = 0; i < str.length; i++) {
		hash = ((hash<<5)-hash)+str.charCodeAt(i);
		hash = hash & hash; // keep 32b
	}
	return hash;
	/* jslint bitwise: false */
};

var fetchHashResource = function(fetchEntry,cb) {
	fetch.fetchUrl(serverUrl + fetchEntry.url,function(err, meta, data) {
		if (err !== null) { return cb(err); }
		var assetHash = stringHash(''+data);
		clientResourcesWeb.push({
			url: fetchEntry.url,
			type: fetchEntry.type,
			hash: assetHash
		});
		cb(null);
	});
};

var fetchHashResources = function(fetchList, cb) {
	var resourceStack = fetchList;
	var resourceLoader = function() {
		resourceStack = resourceStack.slice(1);
		if (resourceStack.length === 0) {
			cb(null);
		} else {
			fetchHashResource(resourceStack[0],resourceLoader);
		}
	};
	fetchHashResource(resourceStack[0],resourceLoader);
};

var createClientResourceFetchList = function() {
	var fetchList = [];
	for (var clientResourceIdxJs in clientResources.js) {
		var urlJs = clientResources.js[clientResourceIdxJs];
		fetchList.push({url:urlJs,type:'js'});
	}
	for (var clientResourceIdxCss in clientResources.css) {
		var urlCss = clientResources.css[clientResourceIdxCss];
		fetchList.push({url:urlCss,type:'css'});
	}
	for (var clientResourceIdxCssData in clientResources.cssData) {
		var urlCssData = clientResources.cssData[clientResourceIdxCssData];
		fetchList.push({url:urlCssData,type:'cssData'});
	}
	return fetchList;
};

function renderTemplatePath(viewPath) {
	return function (req, res) {
		res.locals.query = req.query;
		var qi = req.url.indexOf('?');
		if (qi === -1) {
			qi = req.url.length;
		}
		res.render(viewPath + req.url.substring(req.route.path.length-1, qi));
	};
}

function renderIndex() {
	var inlineData = fs.readFileSync(__dirname+'/../dist/es5-ff-spa-loader.min.js');
	var inline = '\n\t\t<script>'+inlineData+'</script>';
	var inlineNot = '\n\t\t<script src=\"/static/es5-ff-spa-loader.js\"></script>';	
	return function (req, res) {
		res.render('index', {
			inlineNot: useInline?'':inlineNot,
			inline: useInline?inline:''
		});
	};
}

addClientResource('/static/module/jquery/jquery.js','js');
addClientResource('/static/module/angular/angular.js','js');
addClientResource('/static/module/angular-route/angular-route.js','js');
addClientResource('/static/module/bootstrap/css/bootstrap.css','css');
addClientResource('/static/module/bootstrap/js/bootstrap.js','js');
addClientResource('/static/css/boot.css','css');
addClientResource('/static/css/style.css','css');
addClientResource('/static/js/example-app.js','js');
addClientResource('/static/js/controller/page-bar.js','js');
addClientResource('/static/js/controller/page-foo.js','js');
addClientResource('/static/js/controller/page-index.js','js');

var server = express();
server.use(morgan('dev'));
server.use(cors({credentials: true, origin: '*'}));
server.set('view engine', 'ejs');
server.set('views',                                       path.join(__dirname,'www_views'));
server.use('/static',                      express.static(path.join(__dirname,'www_static')));
server.use('/static/module/bootstrap',     express.static(path.join(__dirname,'node_modules/bootstrap/dist')));
server.use('/static/module/jquery',        express.static(path.join(__dirname,'node_modules/jquery/dist')));
server.use('/static/module/angular',       express.static(path.join(__dirname,'node_modules/angular')));
server.use('/static/module/angular-route', express.static(path.join(__dirname,'node_modules/angular-route')));

server.get('/static/es5-ff-spa-loader.js', function (req,res) {
	res.write(fs.readFileSync(__dirname+'/../dist/es5-ff-spa-loader.js', 'utf8'));
	res.end();
});
server.get('/static/spa-client-resources', function (req,res) {
	res.json({data: {resources: clientResourcesWeb}});
});

server.get('/',                               function (req, res) {res.redirect('/example-ui');});
server.get('/example-ui/thtml/*',             renderTemplatePath('thtml/'));
server.get('/example-ui',                     renderIndex());
console.info('Server config done.');

server.listen(8080);
console.info('Server started on port 8080');

var res = createClientResourceFetchList();
fetchHashResources(res, function(err) {
	if (err !== null) {console.log(err);}
	console.log('Total assets build: '+clientResourcesWeb.length);
});