var currentSection = "main-pane";
var moveanim = {time:0, beginX:0, changeX:0.0, beginY:0, changeY:0, duration:0.0, element:null, timer:null};
// var tabTag = "-tab";
var paneTag = "-pane";
var iWafflesPanes = new Array("main", "about", "settings", "search", "map", "details", "disclosure");

function ScrollSection(link, scrollArea, offset)
{
	if (currentSection == link) {
		return;
	}
	lastSection = currentSection;
	currentSection = link;
	
    theScroll = document.getElementById(scrollArea);
	
	var elem = document.getElementById(link)
	
	position = findElementPos(document.getElementById(link));
	
	if (offset != "") {
		offsetPos = findElementPos(document.getElementById(offset));
		position[0] = position[0] - offsetPos[0];
	}

	scrollStart(theScroll, theScroll.scrollLeft, position[0], "horiz");
}

// Scroll the page using the arrows

function ScrollArrow(direction, toolbar, scrollArea, offset) {

	for (var i = 0; i < iWafflesPanes.length; i++) {
		if (iWafflesPanes[i] == currentSection.split("-")[0]) {
			if (direction == "left") {
				if (i - 1 < 0) {
					gotoPane = iWafflesPanes[iWafflesPanes.length - 1];
				} else {
					gotoPane = iWafflesPanes[i - 1];
				}
			} else {
				if ((i + 1) > (iWafflesPanes.length - 1)) {
					gotoPane = iWafflesPanes[0];
				} else {
					gotoPane = iWafflesPanes[i + 1];
				}
			}
		}
	}
	
    ScrollSection(gotoPane+paneTag, scrollArea, offset);
}

//
// Animated Scroll Functions
// Scrolls are synchronous -- only one at a time.
//

var scrollanim = {time:0, begin:0, change:0.0, duration:0.0, element:null, timer:null};

function scrollStart(elem, start, end, direction)
{
	//console.log("scrollStart from "+start+" to "+end+" in direction "+direction);

	if (scrollanim.timer != null) {
		clearInterval(scrollanim.timer);
		scrollanim.timer = null;
	}
	scrollanim.time = 0;
	scrollanim.begin = start;
	scrollanim.change = end - start;
	scrollanim.duration = 25;
	scrollanim.element = elem;
	
	if (direction == "horiz") {
		scrollanim.timer = setInterval("scrollHorizAnim();", 15);
	}
	else {
		scrollanim.timer = setInterval("scrollVertAnim();", 15);
	}
}

function scrollHorizAnim()
{
	if (scrollanim.time > scrollanim.duration) {
		clearInterval(scrollanim.timer);
		scrollanim.timer = null;
	}
	else {
		move = sineInOut(scrollanim.time, scrollanim.begin, scrollanim.change, scrollanim.duration);
		scrollanim.element.scrollLeft = move;
		scrollanim.time++;
	}
}

function moveStart(elem, startX, endX, startY, endY, duration)
{
	if (moveanim.timer != null) {
		clearInterval(moveanim.timer);
		moveanim.timer = null;
	}
	moveanim.time = 0;
	moveanim.beginX = startX;
	moveanim.changeX = endX - startX;
	moveanim.beginY = startY;
	moveanim.changeY = endY - startY;
	moveanim.duration = duration;
	moveanim.element = elem;

	moveanim.timer = setInterval("moveAnimDo();", 15);
}

function moveAnimDo()
{
	if (moveanim.time > moveanim.duration) {
		clearInterval(moveanim.timer);
		moveanim.timer = null;
	}
	else {
		moveX = cubicOut(moveanim.time, moveanim.beginX, moveanim.changeX, moveanim.duration);
		moveY = cubicOut(moveanim.time, moveanim.beginY, moveanim.changeY, moveanim.duration);
		moveanim.element.style.left = moveX + "px";
		moveanim.element.style.top = moveY + "px";
		moveanim.time++;
	}
}

function findElementPos(elemFind)
{
	var elemX = 0;
	var elemY = 0;
	do {
		elemX += elemFind.offsetLeft;
		elemY += elemFind.offsetTop;
	} while ( elemFind = elemFind.offsetParent )

	return Array(elemX, elemY);
}

function sineInOut(t, b, c, d)
{
	return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
}