/**
 * @file 
 * This javascript enables Medem popup images.  These are diagrams which
 * appear on several medem.com pages.  When the mouse hovers over various
 * parts of the images, popups appear showing additional detail.
 * 
 * This code is based on javascript from the previous medem.com site.
 * Modified to work with medem_filter.module, and initialized only after the
 * document is ready.  The older way of including javascript within the page
 * was causing problems, in particular rendering problems on IE 6.  This
 * approach is vastly easier for the content authors, as a side benefit.
 * 
 * This code allows only one popup image per page.  The main image and each
 * popup must be named very carefully, following the nameing convention used
 * on the previous medem.com website.  The images must also follow the uniform
 * size and popup positions.
 */

var dom = (document.getElementById) ? true : false;
var ns5 = (!document.all && dom || window.opera) ? true: false;
var ie5 = ((navigator.userAgent.indexOf("MSIE")>-1) && dom) ? true : false;
var ie4 = (document.all && !dom) ? true : false;
var nodyn = (!ns5 && !ie4 && !ie5 && !dom) ? true : false;

var origWidth, origHeight;

// avoid error of passing event object in older browsers
if (nodyn) { event = "nope" }

///////////////////////  CUSTOMIZE HERE   ////////////////////
// settings for tooltip 
// Do you want tip to move when mouse moves over link?
var tipFollowMouse= true;	
// Be sure to set tipWidth wide enough for widest image
var tipWidth= 406;
var offX= 20;	// how far from mouse to show tip
var offY= 12; 
var tipFontFamily= "Verdana, arial, helvetica, sans-serif";
var tipFontSize= "8pt";
// set default text color and background color for tooltip here
// individual tooltips can have their own (set in messages arrays)
// but don't have to
var tipFontColor= "#000000";
var tipBgColor= "#ffffff"; 
var tipBorderColor= "#000066";
var tipBorderWidth= 0;
var tipBorderStyle= "solid";
var tipPadding= 3;

// tooltip content goes here (image, description, optional bgColor, optional textcolor)
var messages = new Array();


/**
 * Initialize a page with a medem popup image.
 * 
 * Here we search the page for an img with id "tipImg".  This would have been
 * written to the page by medem_filter.module, along with a usemap and other
 * page elements necessary for the tooltip to work.
 * 
 * When we find the element, we parse it to learn the 'label'.  We rely on a
 * naming convention for all popup images, based on the label.  These popups
 * will only work if everything is properly named.
 */
function medem_image_prepare() {
  // Find the image and parse the usemap attribute to learn the label.
  // The usemap is set in medem_filter.module, and it looks like "#LABEL_dia1_Map"
  var useMap = $('#tipImg').attr('usemap');
  var labelEnd = useMap.indexOf('_dia1_Map');
  var label = useMap.slice(1, labelEnd);

  if (!label)
    return; // Nothing to do.

  var theImgs = new Array();
  for (var i=0; i<6; i++) {
  	theImgs[i] = new Image();
    theImgs[i].src = Drupal.settings.medem.imagePath + label + 'Z' + (i+1) + ".gif";
    messages[i] = new Array(theImgs[i].src, '', "transparent");
  }
  initTip();
}

var startStr = '<table width="' + tipWidth + '"><tr><td align="center" width="100%"><img src="';
var midStr = '" border="0"></td></tr><tr><td valign="top">';
var endStr = '</td></tr></table>';

var tooltip, tipcss;
function initTip() {
    if (nodyn) return;
    //alert('initTip called');
	tooltip = (ie4)? document.all['tipDiv']: (ie5||ns5)? document.getElementById('tipDiv'): null;
    //alert("in initTip, tooltip is now " + tooltip);
	tipcss = tooltip.style;
	if (ie4||ie5||ns5) {	// ns4 would lose all this on rewrites
		tipcss.width = tipWidth+"px";
		tipcss.fontFamily = tipFontFamily;
		tipcss.fontSize = tipFontSize;
		tipcss.color = tipFontColor;
		tipcss.backgroundColor = tipBgColor;
		tipcss.borderColor = tipBorderColor;
		tipcss.borderWidth = tipBorderWidth+"px";
		tipcss.padding = tipPadding+"px";
		tipcss.borderStyle = tipBorderStyle;
	}
	if (tooltip&&tipFollowMouse) {
		document.onmousemove = trackMouse;
	}
}

var t1,t2;	// for setTimeouts
var tipOn = false;	// check if over tooltip link
function doTooltip(evt,num) {
	if (!tooltip) return;
	if (t1) clearTimeout(t1);	if (t2) clearTimeout(t2);
	tipOn = true;
	// set colors if included in messages array
	if (messages[num][2])	var curBgColor = messages[num][2];
	else curBgColor = tipBgColor;
	if (messages[num][3])	var curFontColor = messages[num][3];
	else curFontColor = tipFontColor;
	if (ie4||ie5||ns5) {
		var tip = startStr + messages[num][0] + midStr + '<span style="font-family:' + tipFontFamily + '; font-size:' + tipFontSize + '; color:' + curFontColor + ';">' + messages[num][1] + '</span>' + endStr;
		tipcss.backgroundColor = curBgColor;
	 	tooltip.innerHTML = tip;
	}
	if (!tipFollowMouse) positionTip(evt);
	else t1=setTimeout("tipcss.visibility='visible'",100);
}

var mouseX, mouseY;
function trackMouse(evt) {
	standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes
	mouseX = (ns5)? evt.pageX: window.event.clientX + standardbody.scrollLeft;
	mouseY = (ns5)? evt.pageY: window.event.clientY + standardbody.scrollTop;
	if (tipOn) positionTip(evt);
}
function positionTip(evt) {
	if (!tipFollowMouse) {
		mouseX = (ns5)? evt.pageX: window.event.clientX + standardbody.scrollLeft;
		mouseY = (ns5)? evt.pageY: window.event.clientY + standardbody.scrollTop;
	}
	// tooltip width and height
	var tpWd = (ie4||ie5)? tooltip.clientWidth: tooltip.offsetWidth;
	var tpHt = (ie4||ie5)? tooltip.clientHeight: tooltip.offsetHeight;
	// document area in view (subtract scrollbar width for ns)
	var winWd = (ns5)? window.innerWidth-20+window.pageXOffset: standardbody.clientWidth+standardbody.scrollLeft;
	var winHt = (ns5)? window.innerHeight-20+window.pageYOffset: standardbody.clientHeight+standardbody.scrollTop;
	// check mouse position against tip and window dimensions
	// and position the tooltip 
	if ((mouseX+offX+tpWd)>winWd) 
		tipcss.left = mouseX-(tpWd+offX)+"px";
	else tipcss.left = mouseX+offX+"px";
	if ((mouseY+offY+tpHt)>winHt) 
		tipcss.top = winHt-(tpHt+offY)+"px";
	else tipcss.top = mouseY+offY+"px";
	if (!tipFollowMouse) t1=setTimeout("tipcss.visibility='visible'",100);
}

function hideTip() {
	if (!tooltip) return;
	t2=setTimeout("tipcss.visibility='hidden'",100);
	tipOn = false;
}