(function() {

var xmlHttp;
var year = '';
var authorId = '';

function getXmlHttpObject() {
	var xmlHttp = null;
	try {
		xmlHttp = new XMLHttpRequest();
	} catch(e) {
		try {
			xmlHttp = new ActiveXObject('Msxml2.XMLHTTP');
		} catch(e) {
			xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
		}
	}
	return xmlHttp;
}

function change() {
	xmlHttp = getXmlHttpObject();
	if (xmlHttp == null) {
		alert ('Oop! Browser does not support HTTP Request.')
		return;
	}

	var url = aeGlobal.serverUrl + '/?action=ea_monthly_ajax'
			+ '&year=' + year
			+ '&author=' + authorId;

	xmlHttp.onreadystatechange = runChange;
	xmlHttp.open('GET', url, true);
	xmlHttp.setRequestHeader('Content-type', 'charset=UTF-8');
	xmlHttp.send(null);
}

function runChange() {
	var archives = document.getElementById('easy-archives');
	var filter = getElementsByClassName('filter', 'div', archives)[0];

	if (xmlHttp.readyState < 4 && !document.getElementById('ea-loader')) {
		document.body.style.cursor = 'wait';
		var loadingText = (aeGlobal.loadingText == undefined) ? 'Loading...' : aeGlobal.loadingText + '...';
		if (filter) {
			filter.innerHTML = '<div id="ea-loader" class="ea-loader">' + loadingText + '</div>';
		}

	} else if (xmlHttp.readyState == 4 || xmlHttp.readyState=='complete') {
		archives.innerHTML = xmlHttp.responseText;
		document.body.style.cursor = 'auto';
		bindActions();
	}
}

function changeYear(select) {
	year = select.value;
	change();
}

function changeAuthor(select) {
	authorId = select.value;
	change();
}

function toggle(button) {
	var parent = button.parentNode;
	var dailyArchives = parent.nextSibling;

	if (button.className == 'ea-open-button') {
		button.className = 'ea-closed-button';
		dailyArchives.className = 'ea-closed';

	} else {
		button.className = 'ea-open-button';
		dailyArchives.className = 'ea-open';
	}
}

function expandAll() {
	var elements = getElementsByClassName('ea-closed-button', 'a', document.getElementById('easy-archives'));
	for (var i = 0; i < elements.length; i++) {
		toggle(elements[i]);
	}
}

function collapseAll(target) {
	var elements = getElementsByClassName('ea-open-button', 'a', document.getElementById('easy-archives'));
	for (var i = 0; i < elements.length; i++) {
		toggle(elements[i]);
	}
}

function getElementsByClassName(className, tag, parent) {
	var allTags = (tag == '*' && parent.all) ? parent.all : parent.getElementsByTagName(tag);
	var matchingElements = new Array();

	className = className.replace(/\-/g, '\\-');
	var regex = new RegExp('(^|\\s)' + className + '(\\s|$)');

	var element;
	for (var i = 0; i < allTags.length; i++) {
		element = allTags[i];
		if (regex.test(element.className)) {
			matchingElements.push(element);
		}
	}

	return matchingElements;
}

function addEvent(node, type, listener) {
	if(node.addEventListener) {
		node.addEventListener(type, listener, false);
		return true;
	} else if(node.attachEvent) {
		node['e' + type + listener] = listener;
		node[type + listener] = function() {
			node['e' + type + listener](window.event);
		};
		node.attachEvent('on' + type, node[type + listener]);
		return true;
	}
	return false;
}

function bindActions() {
	var wrap = document.getElementById('easy-archives');

	var openButtons = getElementsByClassName('ea-open-button', 'a', wrap);
	for(var i=0; i<openButtons.length; i++) {
		var openButton = openButtons[i];
		addEvent(openButton, 'click', function(ev){
			toggle(this);
		});
	}

	var closedButtons = getElementsByClassName('ea-closed-button', 'a', wrap);
	for(var i=0; i<closedButtons.length; i++) {
		var closedButton = closedButtons[i];
		addEvent(closedButton, 'click', function(ev){
			toggle(this);
		});
	}

	var expandButton = getElementsByClassName('ea-expand-all', 'input', wrap);
	if(expandButton.length == 1) {
		expandButton = expandButton[0];
		addEvent(expandButton, 'click', function(ev){
			expandAll();
		});
	}

	var collapseButton = getElementsByClassName('ea-collapse-all', 'input', wrap);
	if(collapseButton.length == 1) {
		collapseButton = collapseButton[0];
		addEvent(collapseButton, 'click', function(ev){
			collapseAll();
		});
	}

	var yearSelector = getElementsByClassName('ea-year-selector', 'select', wrap);
	if(yearSelector.length == 1) {
		yearSelector = yearSelector[0];
		addEvent(yearSelector, 'change', function(ev){
			changeYear(this);
		});
	}

	var authorSelector = getElementsByClassName('ea-author-selector', 'select', wrap);
	if(authorSelector.length == 1) {
		authorSelector = authorSelector[0];
		addEvent(authorSelector, 'change', function(ev){
			changeAuthor(this);
		});
	}
}

function initPage() {
	var wrap = document.getElementById('easy-archives');

	var yearSelector = getElementsByClassName('ea-year-selector', 'select', wrap);
	if(yearSelector.length == 1) {
		yearSelector = yearSelector[0];
		yearSelector.selectedIndex = 0;
	}

	var authorSelector = getElementsByClassName('ea-author-selector', 'select', wrap);
	if(authorSelector.length == 1) {
		authorSelector = authorSelector[0];
		authorSelector.selectedIndex = 0;
	}

	bindActions();
}

if (document.addEventListener) {
	document.addEventListener("DOMContentLoaded", initPage, false);

} else if (/MSIE/i.test(navigator.userAgent)) {
	document.write('<script id="__ie_onload_for_wp_easyarchive" defer src="javascript:void(0)"></script>');
	var script = document.getElementById('__ie_onload_for_inove');
	script.onreadystatechange = function() {
		if (this.readyState == 'complete') {
			initPage();
		}
	}

} else if (/WebKit/i.test(navigator.userAgent)) {
	var _timer = setInterval( function() {
		if (/loaded|complete/.test(document.readyState)) {
			clearInterval(_timer);
			initPage();
		}
	}, 10);

} else {
	window.onload = function(e) {
		initPage();
	}
}

})();