//    Licensed Materials - Property of IBM
//
//    IBM Cognos Products: ps
//
//    (C) Copyright IBM Corp. 2005, 2013
//
//    US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
// Copyright (C) 2008 Cognos Incorporated. All rights reserved.
// Cognos and the Cognos logo are trademarks of Cognos Incorporated.

function addEvent(obj, evType, fn) {
	if (obj.addEventListener) {
		obj.addEventListener(evType, fn, false);
		return true;
	} else if (obj.attachEvent) {
		var r = obj.attachEvent("on" + evType, fn);
		return r;
	} else {
		return false;
	}
}

function removeEvent(obj, type, fn) {
	if (obj.removeEventListener) {
		return obj.removeEventListener(type, fn, false);
	} else if (obj.detachEvent) {
		return obj.detachEvent('on' + type, fn);
	} else {
		return false;
	}
}

var aboutBox = null;


function updateAboutBoxTitleAttribute(){
	try{
		if (aboutBox.currentMessageRequest.readyState == 4)
		{
			if (aboutBox.currentMessageRequest.status == 404){
				//in this case we failed to load the real message file....lets load the default
				aboutBox.messageLoadErrorCount++;
				if (aboutBox.messageLoadErrorCount < 2) {
					aboutBox.loadMessageFile(aboutBox.JSMessageFileDefault);	
				}
			}
			if (aboutBox.currentMessageRequest.status >= 200 && aboutBox.currentMessageRequest.status < 300)
				{
					var messageFile = eval("(" + aboutBox.currentMessageRequest.responseText + ")");
					//Set the ALT text for the aboutbox image
					var text = messageFile.ABT.IDS_ABT_PRODUCT + "\n" + messageFile.ABT.IDS_ABT_VERSION + "\n" + messageFile.ABT.IDS_ABT_LEGAL;
					aboutBox.imageEl.alt = text;
					aboutBox.imageEl.title = text;
					text = messageFile.ABT.IDS_ABT_OK;
					if (typeof messageFile.ABT.IDS_ABT_OK === "undefined"){
					   //if it can't find the ok string in the passed in message file then lets go with a hard coded ok....
					   text = "OK";
					}
					aboutBox.okButtonText = text;
				}
				aboutBox.completeShow();
			}
		}
		catch (e){aboutBox.completeShow();}
}


function about_dialog(aboutImage, defaultImage, JSMessageFile, JSMessageFileDefault) {
	this.xmlHttpVersions = [
					"Msxml2.XMLHTTP.6.0", 
					"Msxml2.XMLHTTP.3.0",
					"Msxml2.XMLHTTP",
					"Microsoft.XMLHTTP"
					];
	this.xmlHttpDefault=this.findXMLHttpActiveXVersion();
	this.mainDiv = null;
	this.aboutImage = aboutImage;
	this.imageHeight = 452;
	this.imageWidth = 652;
	this.lockingFrame = null;
	this.defaultImage = defaultImage;
	this.JSMessageFile = JSMessageFile;
	this.JSMessageFileDefault = JSMessageFileDefault;
	aboutBox = this;
	this.currentMessageRequest = null;
	this.messageLoadErrorCount = 0;
	this.idToFocusOnClose = null;
	this.okButtonText = null;
	
}


about_dialog.prototype = {
	create: function() {
		this.errorCount = 0;
		this.mainDiv = document.createElement("div");
		this.mainDiv.tabIndex = "-1";
		this.mainDiv.style.width = this.imageWidth;
		this.mainDiv.style.position = "absolute";
		this.lockingFrame = document.createElement("div");
		this.lockingFrame.style.filter = "alpha(opacity=50)";
		this.lockingFrame.style.opacity = "0.5";
		this.lockingFrame.style.MozOpacity = "0.5";
		this.lockingFrame.style.height = "100%";
		this.lockingFrame.style.width = "100%";
		this.lockingFrame.style.position = "absolute";
		this.lockingFrame.style.left = "0px";
		this.lockingFrame.style.top = "0px";
		this.lockingFrame.style.backgroundColor = "rgb(221, 221, 221)";
		this.lockingFrame.style.zIndex = "100";
		this.mainDiv.style.zIndex = "200";
		this.hide();
		document.body.appendChild(this.mainDiv);
		document.body.appendChild(this.lockingFrame);	
		this.imageEl = document.createElement("img");
		this.imageEl.tabIndex = "0";
		if (typeof this.defaultImage !== 'undefined'){
			this.imageEl.style.visibility = "hidden";
			addEvent(this.imageEl, "error", this.loadDefaultImage);
			addEvent(this.imageEl, "load", this.loadImageLoadComplete);
		}
		this.imageEl.src = this.aboutImage;
		this.mainDiv.appendChild(this.imageEl);
		addEvent(this.mainDiv, "click", this.aboutClicked);
	},
	loadMessageFile: function(messageFile){
		aboutBox.currentMessageRequest = aboutBox.getXMLHttpRequest();
		aboutBox.currentMessageRequest.open("GET",messageFile,true);
		aboutBox.currentMessageRequest.onreadystatechange = updateAboutBoxTitleAttribute;
		aboutBox.currentMessageRequest.send(null);
	},


	loadImageLoadComplete: function(){
		aboutBox.loadMessageFile(aboutBox.JSMessageFile);
		aboutBox.imageEl.style.visibility = "visible";
	},

	loadDefaultImage: function(){
		aboutBox.errorCount++;
		if (aboutBox.errorCount < 2){
			aboutBox.imageEl.src = aboutBox.defaultImage;
		} 
	},
    createOKButton: function() {
		var aboutDivEl = document.createElement("div");
		aboutDivEl.style.border = "1px solid #999999";
		aboutDivEl.style.fontSize = "90%";
        aboutDivEl.style.fontWeight = "normal";
		aboutDivEl.style.padding = "2px 10px 3px";
		aboutDivEl.style.position = "absolute";
		this.mainDiv.appendChild(aboutDivEl);
		aboutDivEl.width = "55";

		var anc = document.createElement("a");
        anc.href = "javascript:if (aboutBox != null){aboutBox.aboutClicked();}";
        anc.onclick = function() {return false;};
		aboutDivEl.appendChild(anc);
		var ancText = this.okButtonText;
		if (ancText == null){
		    ancText = "OK";
		}
		var textEl = document.createTextNode(ancText);
		
		anc.appendChild(textEl);
		anc.style.color = "#000000";
		anc.style.textDecoration = "none";
		anc.setAttribute("role", "button");
		this.okButton = anc;
		addEvent(anc, "keydown", this.aboutKeyDown);
		aboutDivEl.style.left = 20 + "px";
		aboutDivEl.style.bottom = "20px";
	},
	
	show: function() {
		if (this.mainDiv == null) {
			this.create();
			createOK = true;
		} else {
		   this.completeShow();
		}
	},
	completeShow: function(){
		this.center();
		this.mainDiv.style.display = 'block';
		this.mainDiv.style.visibility = 'visible';
		this.lockingFrame.style.display = 'block';
		this.lockingFrame.style.visibility = 'visible';
		addEvent(document.body, "keydown", this.aboutKeyDown);
		this.createOKButton();
		this.mainDiv.focus();
	
	}
	,
		
	center: function() {
		this.mainDiv.style.left = ((document.body.clientWidth - this.imageWidth) / 2) + document.body.scrollLeft + "px";
		this.mainDiv.style.top = ((this.getWindowHeight() - this.imageHeight) / 2) + document.body.scrollTop + "px";	
	}, 
	
	getWindowHeight: function() {
		if( document.documentElement && document.documentElement.clientHeight ) {
			return  document.documentElement.clientHeight;
		} else if( document.body &&  document.body.clientHeight ) {
			return  document.body.clientHeight;
		} else if( typeof( window.innerHeight ) == 'number' ) {
			return window.innerHeight;
		}
	},

	aboutClicked: function(event) {
		if (event.stopPropagation) {
			event.stopPropagation();
		} else {
			event.cancelBubble = 'true';
		}
		if (aboutBox != null) {
			aboutBox.hide();
			aboutBox.destroyDialog();
		}
	},

	aboutKeyDown: function(event) {
		if (aboutBox == null) {
			return;
		}
		if (event.keyCode == 27 || event.keyCode == 32) {		
			aboutBox.hide();
			aboutBox.destroyDialog();
		}
	},

	hide: function() {
		removeEvent(document.body, 'keydown', this.aboutKeyDown);
		aboutBox.mainDiv.style.display = 'none';
		this.mainDiv.style.visibility = 'hidden';
		this.lockingFrame.style.display = 'none';
		this.lockingFrame.style.visibility = 'hidden';
		if (this.idToFocusOnClose != null){
		    var focEl = document.getElementById(this.idToFocusOnClose);
		    if (focEl != null) {
				focEl.focus();
			}	
		}
	},

	destroyDialog: function() {
		document.body.removeChild(this.mainDiv);
		document.body.removeChild(this.lockingFrame);
		this.mainDiv = null;
		this.lockingFrame = null;
		aboutBox = null;
	},
	findXMLHttpActiveXVersion: function(){
		if (window.ActiveXObject) {
			var i, l = this.xmlHttpVersions.length;
			for (i = 0; i < l; i++) {
				try {
					// Try and create the ActiveXObject for Internet Explorer, if it doesn't work, try again.
					var xmlhttp = new ActiveXObject(this.xmlHttpVersions[i]);
					if (xmlhttp) 
						return this.xmlHttpVersions[i];
				} catch (e) {
					// this ActiveX is not there, continue with next one in list
				} 
			}
		}
	
		return null;
	
	},
	getXMLHttpRequest:function(){
		if (this.xmlHttpDefault != null) {
			return new ActiveXObject(this.xmlHttpDefault);
		}
		// Well if there is no ActiveXObject available it must be firefox, opera, or something else
		if (typeof XMLHttpRequest != 'undefined') {
			try {
				return new XMLHttpRequest();
			} catch (e) {
				alert(e);
			}
		}
	
		throw "No XMLHttpRequest object is available";	
	}

};