(function(){
	var tinyDOM = function(selector){
		return new tinyDOMFunction(selector);
	}

	var tinyDOMFunction = function(selector) {
		if(selector === null || typeof(selector) === 'undefined'){
			this.length = 0;
		} else if(typeof(selector) === 'string'){
			var elements = document.querySelectorAll(selector);

			this.length = elements.length;
			for(var i = 0; i < elements.length; i++){
				var e = elements.item(i);
				if(typeof(e.td_prop) === 'undefined'){
					e.td_prop = {
						isHidden: false
					};
				}
				this[i] = elements.item(i);
			}
		} else {
			this[0] = selector;
			this.length = 1;
		}

		return this;
	}

	tinyDOM.fn = tinyDOMFunction.prototype = {
		each: function(fn) {
			var l = this.length;
			while(l--){
				fn(l, this[l], this);
			}
			return this;
		},
		hide: function(){
			this.each(function(i, e){
				if(!e.td_prop.isHidden){
					e.style.td_previousDisplay = e.style.display;
					e.style.display = 'none';
					e.td_prop.isHidden = true;
				}
			});
			return this;
		},
		show: function(){
			this.each(function(i, e){
				if(e.td_prop.isHidden === true){
					if(typeof(e.style.td_previousDisplay) !== 'undefined'){
						e.style.display = e.style.td_previousDisplay;
					} else {
						e.style.display = 'block';
					}
					e.td_prop.isHidden = false;
				}
			});
			return this;
		},
		on: function(ev, fn){
			this.each(function(i, e){
				e.addEventListener(ev, fn);
			});
			return this;
		},
		first: function(){
			if(typeof(this[0]) !== 'undefined'){
				return this[0];
			} else {
				return null;
			}
		},
		data: function(key, value){
			var e = this[0];
			if(typeof(value) !== 'undefined'){
				e.setAttribute('data-'+key, value);
				return this;
			} else {
				return e.getAttribute('data-'+key);
			}
		}
	}

	tinyDOM.exists = function(obj){
		return obj !== null && typeof(obj) !== 'undefined';
	}

	tinyDOM.merge = function(json1, json2){
		if(!this.exists(json1) || !this.exists(json2)){
			return null;
		} else {
			for(var prop in json2) {
				if(json2.hasOwnProperty(prop)){
					json1[prop] = json2[prop];
				}
			}
			return json1;
		}
	}

	tinyDOM.ajax = function(options){
		var req = new XMLHttpRequest();
		var _this = this;

		var params = {
			method: 'GET',
			url: '',
			async: true,
			user: null,
			password: null,
			responseType: 'text',
			data: null,
			headers: [],
			success: null,
			error: null
		}

		this.merge(params, options);

		req.responseType = params.responseType;

		req.onreadystatechange = function(){
			if(req.readyState > 1){
				if(req.status >= 200 && req.status < 400){
					if (req.readyState === 4 && _this.exists(params.success)){
						params.success(req.response, req);
					}
				} else {
					if(!_this.exists(req.td_hasAborted) || !req.td_hasAborted){
						if(_this.exists(params.error)){
							params.error({status: req.status, message: req.statusText}, req);
						}
						req.td_hasAborted = true;
						req.abort();
					}
				}
			}
		}

		req.open(
			params.method,
			params.url,
			params.async,
			params.user,
			params.password
		);

		for(var i = 0; i < params.headers.length; i++){
			req.setRequestHeader(params.headers[i].header, params.headers[i].value);
		}

		req.send(params.data);
		return req;
	};

	if(!window.μ){
		window.μ = tinyDOM;
	}
	if(!window.mu){
		window.mu = tinyDOM;
	}
})();