var FileUpload = function(t, uploadBtnText, returnCB){
	var events = new EventManager(),
		hiddenInput = getHiddenInput(),
		btnText = uploadBtnText || 'Upload',
		ele = getElementFromString('<div class="uploadBtn button mint auto">' + btnText + '</div>');

	if(!returnCB) console.error("You must have a return callback to initialize FileUpload.")

	t.appendChild(ele);

	events.add(ele, 'click', openFileInput);
	events.add(ele, 'dragover', dragHover);
	events.add(ele, 'dragleave', dragHover);

	events.add(ele, 'drop', checkFileInput);
	events.add(hiddenInput, 'change', checkFileInput);

	this.open = openFileInput;
	this.exit = exit;

	function openFileInput(e){ if(e && e.preventDefault) e.preventDefault(); hiddenInput.click(); }

	function checkFileInput(e){
		e.target.classList.remove('bright');
		var f =  (e.target && !!e.target.files) ? e.target.files[0] : null;
		if(!f) f = (e.path && !!e.path[0].files) ? e.path[0].files[0] : null;
		if(!f) f = (e.dataTransfer && !!e.dataTransfer.files) ? e.dataTransfer.files[0] : null;
		if(!f) return;
		var fr = new FileReader();
		fr.onload = function(e) {
			var result = e.target.result;
			returnCB(result, f);
		}
		fr.readAsText(f);
	}

	function dragHover(e) {
		e.stopPropagation();
		e.preventDefault();
		if(e.type === 'dragover') {
			e.target.classList.add('bright');
		} else {
			e.target.classList.remove('bright');
		}
	}

	function exit(){
		removeChild(t, ele);
		if(!!events) events.reset();
		events = hiddenInput = ele = null;
	}
};