var WEBAPI_URL = 'http://www.efficiencyvermont.com/stella/custom-content/marketplace2/webapi.cfm';
	
	function AjaxReq () {
		this.req = null;
		this.invoke = invoke;
		this.on_ready_state_change = on_ready_state_change;
		this.oncomplete = null;
		
		function invoke(method, params) {
			var url = WEBAPI_URL + "?invoke=" + method;
			if (params != null) {
				for (var name in params)
					url += '&' + name + '=' + escape(params[name]);
			}
			this.req = (window.XMLHttpRequest)?
				new XMLHttpRequest():
				new ActiveXObject("Microsoft.XMLHTTP");
			//alert(url);
			this.req.open("GET", url, true);
			var objctx = this;
			this.req.onreadystatechange = function () {objctx.on_ready_state_change();};
			this.req.send(null);
		}
		
		function on_ready_state_change() {
			if (this.req.readyState == 4) {
				//alert(this.req.status);
				if (this.req.status == 200) {
					if (this.on_complete)
						this.on_complete(this.req.responseText);
				}
			}
		}
	}
	
	function AjaxCtl (id) {
		this.baseCtor = AjaxReq;
		this.baseCtor();
		this.id = id;
		this.handlers = new Array();

		this.on_complete = on_complete;
		this.check_all = check_all;
		this.check_values = check_values;
		this.get_checked_value = get_checked_value;
		
		function add_event_handler(obj) {
			this.listeners.push(obj);
		}

		function on_complete(text) {
			//alert(text);
			var el = document.getElementById(this.id);
			if (!el) return;
			el.innerHTML = text;
			if (this.on_update_complete) this.on_update_complete();
			for (var i = 0; i < this.handlers.length; i++) {
				if (this.handler[i].on_update_complete)
					this.handler[i].on_update_complete();
			}
		}
		
		function check_all(b) {
			var el = document.getElementById(this.id);
			if (!el) return;
			var inputs = el.getElementsByTagName('INPUT');
			for (var i = 0; i < inputs.length; i++) {
				if (typeof inputs[i].checked == 'undefined') continue;
				inputs[i].checked = b;
			}
		}
		
		function check_values(a) {
			var el = document.getElementById(this.id);
			if (!el) return;
			var h = new Array();
			for (var i = 0; i < a.length; i++) h[a[i]] = true;
			var inputs = el.getElementsByTagName('INPUT');
			for (var i = 0; i < inputs.length; i++) {
				if (typeof inputs[i].checked == 'undefined') continue;
				inputs[i].checked = h[inputs[i].value]?1:0;
			}
		}
		
		function get_checked_value() {
			var el = document.getElementById(this.id);
			if (!el) return;
			var inputs = el.getElementsByTagName('INPUT');
			for (var i = 0; i < inputs.length; i++) {
				if (inputs[i].checked){
					return inputs[i].value;
				}
			}
		}
	}
	
	function CatCtl(id) {
		this.baseCtor = AjaxCtl;
		this.baseCtor(id);
		this.update = update;
		this.on_update_complete = on_update_complete;
		this.on_change = on_change;

		function update(type) {
			var params = new Array();
			if (type) params['type'] = type;
			this.invoke('catctl', params);
		}

		function on_update_complete(text) {
			this.on_change();
		}
		
		function on_change() {
			var cat = this.get_checked_value();
			g_diagCtl.update(cat);
			g_specCtl.update(cat);
		}
	}
	
	function DiagCtl(id) {
		this.baseCtor = AjaxCtl;
		this.baseCtor(id);
		this.update = update;
		
		function update(cat) {
			var params = new Array();
			if (cat) params['cat'] = cat;
			this.invoke('diagctl', params);
		}
	}
	
	function SpecCtl(id) {
		this.baseCtor = AjaxCtl;
		this.baseCtor(id);
		this.update = update;
		
		function update(cat) {
			var params = new Array();
			if (cat) params['cat'] = cat;
			this.invoke('specctl', params);
		}
	}
	
	var g_catCtl = new CatCtl('catctl');
	var g_diagCtl = new DiagCtl('diagctl');
	var g_specCtl = new SpecCtl('specctl');