/* seasonality.js */
var msg = "";
var count = 0;


function initChart(){

	//Assign event handlers to each row of the chart
	var row, mth, mthLabel, i, childCollection;
	
	for(mth=1; mth <= 12; mth++){
		//Mouseovers for month labels
		mthLabel = document.getElementById("mth" + mth);
		if(mthLabel) {
			addEvent(mthLabel, "mouseover", showDetails);
			//addEvent(mthLabel, "mouseout", showExplanation);
			mthLabel.style.cursor = "pointer";
			mthLabel.style.cursor = "hand";
		}
	
		//Mouseovers for bar graphs (only the actual bar chart and not the whole row)
		positiveBar = document.getElementById("posBarForMth" + mth);
		if(positiveBar) {
			addEvent(positiveBar, "mouseover", showDetails);
			//addEvent(positiveBar, "mouseout", showExplanation);
			positiveBar.style.cursor = "pointer";
			positiveBar.style.cursor = "hand";
		}
		
		negativeBar = document.getElementById("negBarForMth" + mth);
		if(negativeBar) {
			addEvent(negativeBar, "mouseover", showDetails);
			//addEvent(negativeBar, "mouseout", showExplanation);
			negativeBar.style.cursor = "pointer";
			negativeBar.style.cursor = "hand";
		}
	}
	
	// default to current month
	var monthToday = 1 + new Date().getMonth();
	turnOnDetails(monthToday);
}

function doNothing() {
	return false;
}


var lastDetailsShown = "";


//Show details for returns for this month
function showDetails(event) {
	
	var e = event || window.event || false;
	var srcElement = false;
	
	if (e) {
		srcElementId = getSrcElement(e).id;
		var month = srcElementId.replace(/mth|posBarForMth|negBarForMth/, "");
		cancelEvent(event);
		turnOnDetails(month);
	}
}
/*
//Restore the general explanation text
function showExplanation(event) {

	var e = event || window.event || false;
	var srcElement = false;
	
	if (e) {
		srcElementId = getSrcElement(e).id;
		cancelEvent(event);
		turnOffDetails();
	}
}
*/

function turnOnDetails(monthNum) {
	
	//document.getElementById("explanation").style.display = "none";
	for(var d, i=1; i <= 12; i++) { //Hide all
		d = document.getElementById("detailsMth" + i);
		if(d){
			d.style.display = "none";
		}
	}
	
	//Turn on the one required
	
	var curr = document.getElementById("detailsMth" + monthNum);
	if (curr){
		curr.style.display = "block";
	}
}

function turnOffDetails() {
	var i;
	for(i=1; i <= 12; i++) { //Hide all
		if(document.getElementById("detailsMth" + i))
			document.getElementById("detailsMth" + i).style.display = "none";
	}
	//document.getElementById("explanation").style.display = "block";
}

//Onload function
addEvent(window, "load", initChart);