(function() {
	window.onerror = function(message, url, lineNumber) {  
		//save error and send to server for example.
		var request = new XMLHttpRequest();
		request.open('POST', '/js_error', true);
		request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
		request.send(
			'message=' + encodeURI(message) +
			'&url=' + encodeURI(url) +
			'&lineNumber=' + encodeURI(lineNumber) +
			'&location=' + encodeURI(window.location.href)
		);
		return false;
	};
	Array.prototype.forEach.call(document.querySelectorAll('.number-field,.email-field,.text-field'), function(field) {
		var input = field.querySelector('input');
		var positionLabel = function(input) { 
			field.classList[input.value ? 'remove' : 'add']('empty');
		}
		positionLabel(input);
		input.addEventListener('keyup', function(event) { positionLabel(event.target); });
		input.addEventListener('blur', function(event) { field.classList.remove('focused'); });
		input.addEventListener('focus', function(event) { field.classList.add('focused'); });
	});
	var body = document.querySelector('body');
	var primaryContent = document.getElementById('primary-content');
	var overlay = document.getElementById('content-overlay');
	primaryContent.addEventListener('keydown', function(event) {
		event.stopPropagation();
		return false;
		//if (body.classList.contains('has-overlay')) {
		//	return false;
		//}
	});
	document.addEventListener('focus', function(event) {
		if (overlay.querySelector('.dlg.open') && !overlay.querySelector('.dlg.open :focus')) {
			overlay.querySelector('.dlg.open').focus();
		}
	}, true);
	function openDlg(dlg, link) {
		body.setAttribute('style', 'width: ' + body.clientWidth + 'px');
		dlg.querySelector('.message').innerHTML = decodeURI(link.dataset.confirmation);
		dlg.querySelector('.confirm').setAttribute('href', link.getAttribute('href'));
		primaryContent.setAttribute('aria-hidden', 'true');
		document.getElementById('overlay').onclick =
			dlg.querySelector('.delete').onclick = function() { closeDlg(dlg); };
		body.classList.add('has-overlay');
		dlg.removeAttribute('aria-hidden');
		dlg.setAttribute('role', 'alertdialog');
		dlg.setAttribute('tabindex', '0');
		dlg.focus();
		setTimeout(function() { dlg.classList.add('open'); }, 100);
	}
	function closeDlg(dlg) {
		setTimeout(function() {
				body.classList.remove('has-overlay');
				body.removeAttribute('style');
			}, 250);
		primaryContent.removeAttribute('aria-hidden');
		dlg.setAttribute('aria-hidden', 'true');
		dlg.removeAttribute('tabindex');
		dlg.classList.remove('open');
		dlg.removeAttribute('role');
	}
	var confirmationDlg = document.getElementById('confirmation-dlg');
	Array.prototype.forEach.call(document.querySelectorAll('a[data-confirmation]'), function(link) {
		link.addEventListener('click', function(event) {
			event.preventDefault();
			openDlg(confirmationDlg, link);
			return false;
		});
	});

	var errorField = document.querySelector('.input-field.has-error input, .input-field.has-error textarea');
	if (errorField) {
		errorField.focus();
	}
	
	var htmlNode = document.documentElement;
	document.addEventListener('keydown', function(event) {
		if (htmlNode.dataset.input != 'kb' &&
				!["input", "textarea", "select", "option"].includes(event.target.nodeName.toLowerCase()) &&
				!event.target.attributes.contenteditable) {
			console.log()
			htmlNode.setAttribute('data-input', 'kb');
		}
	});
	
	document.addEventListener('mousemove', function(event) {
		if (htmlNode.dataset.input != 'mouse' && (event.movementX || event.movementY)) {
			htmlNode.setAttribute('data-input', 'mouse');
		}
	});
})();