export { GET, POST };

function GET(url, data, cb)
{
	var options = {};
	if (typeof url == 'object')
	{
		options = url;
		url = options.url;
	}
	var r = create_request_object();
	url = url + (url.indexOf('?') >= 0 ? '&' : '?') + http_build_query(data);
	r.open('GET', url);
	set_request_callback(r, cb, options);
	r.send();
	return r;
}

function POST(url, data, cb)
{
	var options = {};
	if (typeof url == 'object')
	{
		options = url;
		url = options.url;
	}
	var r = create_request_object();
	r.open('POST', url);
	set_request_callback(r, cb, options);
	if (typeof data != 'string' && (!window.FormData || !(data instanceof FormData)))
	{
		r.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		data = http_build_query(data);
	}
	r.send(data);
	return r;
}

function create_request_object()
{
	if (typeof XMLHttpRequest === 'undefined')
	{
		XMLHttpRequest = function()
		{
			try { return new ActiveXObject("Msxml2.XMLHTTP"); }
			catch(e) {}
			try { return new ActiveXObject("Microsoft.XMLHTTP"); }
			catch(e) {}
			throw new Error("This browser does not support XMLHttpRequest.");
		};
	}
	return new XMLHttpRequest();
}

function set_request_callback(r, cb, options)
{
	if (options.timeout)
		r.timeout = options.timeout;
	if (options.headers)
		for (var k in options.headers)
			r.setRequestHeader(k, options.headers[k]);
	r.onreadystatechange = function()
	{
		if (r.readyState == 4)
		{
			var d;
			if (r.getResponseHeader('Content-Type').indexOf('/json') > 0)
			{
				d = json_decode(r.responseText);
			}
			cb(r, d);
		}
	};
}

function build_array_query(data, prefix)
{
	var s = '', k;
	for (var i in data)
	{
		k = prefix ? prefix+'['+encodeURIComponent(i)+']' : encodeURIComponent(i);
		if (typeof data[i] == 'object' && data[i] !== null)
			s += build_array_query(data[i], k);
		else
			s = s+'&'+k+'='+(data[i] === false || data[i] === null || data[i] === undefined ? '' : encodeURIComponent(data[i]));
	}
	return s;
}

function http_build_query(data)
{
	return build_array_query(data).substr(1);
}

function json_decode(text)
{
	if (!text)
	{
		return null;
	}
	try
	{
		if (window.JSON)
		{
			return JSON.parse(text);
		}
		return eval(text);
	}
	catch(e)
	{
		if (window.console)
		{
			console.log(e);
		}
	}
	return null;
}