// declarations and definitions
var overtureDataArray;
var overtureError;

function buildOvertureURL(overtureID, maxAdCount, isSearch) {
	var url = 'http://cmhtml.overture.com/d/search/p/guardian/js/uk/ctxt/';
	url += '?maxCount=' + maxAdCount + '&keywordCharEnc=latin1&outputCharEnc=latin1';
	
	var mkt;
	switch ('nld') {
		case 'gbr':
			mkt = 'uk';
			break;
		case 'fr':
			mkt = 'fr';
			break;
		case 'de':
			mkt = 'de';
			break;
		case 'usa':
		case 'ca':
			mkt = 'us';
			break;
		default:
			mkt = 'row';	
	}
	
	var sitename
	if (isSearch == 1) {
		sitename = 'search';
	} else {
		sitename = 'Guardian';
	}
	
	url += '&Partner=' + buildPartnerCode(mkt, sitename);
	url += '&mkt=' + mkt;
	url += '&ctxtId=' + overtureID;
	return url;
}

function buildPartnerCode(mkt, site) {
	// For the rest of the world we send a mkt value of 'row', but use 'uk' in the partner code
	if ( mkt == 'row' ) {
		mkt = 'uk';
	}
	
	var partnerCode = 'guardian_';
	partnerCode += mkt;
	partnerCode += '_ctxt_';
	partnerCode += site.toLowerCase();

	return partnerCode
}

// Replace the portion of the string after last space before the trimPoint with ellipses
function trimAndEllipses(string, trimPoint) {
	if (string.length > trimPoint) {
		var spaceBeforeTrimPoint = string.lastIndexOf(" ", trimPoint);
		
		var trimmedString = string.substring(0, spaceBeforeTrimPoint);
		
		return trimmedString.concat("...");
	} else {
		return string;
	}
}

// abstraction for element containing Overture results table
function OvertureDocument() {
	// properties
	this.htmlText = new String();

	if(overtureIsIECompatible) {
		// writing to iframe
		this.document = parent.document;
	} else if(overtureIsDOM) {
		// will be in iframe at this point
		this.document = parent.document;
	} else {
		// will be in main body
		this.document = document;
	}
	
	// methods
	this.inspect = function() {
		alert(this.htmlText);
	};
	this.writeln = function(text) {
		this.htmlText += text + '\n';
	};
	this.write = function(text) {
		this.htmlText += text;
	};
	this.flush = function(isSearch) {
		parent.setOvertureContent(this.htmlText, isSearch);
		this.htmlText = '';
	};
	this.getElementById = function(name) {
		if(overtureIsDOM) {
			return this.document.getElementById(name);
		} else {
			if(overtureIsIECompatible) {	
				return this.document.all[name];
			} else {
				return eval('this.document.'+name);
			}
		}
	};
}

var overtureDocument = new OvertureDocument();

//
// OvertureData
//

// The following function is used for the old drop-down display method, no longer used
// render the text of overture result
function overtureDataRenderFunction(mouseOverId) {

	overtureDocument.write('<font face="Verdana,Geneva,Arial,sans-serif" size="1" color="black">');
	if(overtureCanDoMouseovers) overtureDocument.write('<div style="overflow: hidden; width: 121px;" onmouseover="overtureMouseOver(\'' + mouseOverId + '\')" onmouseout="overtureMouseOut(\'' + mouseOverId + '\')">');

	if(overtureIsNetscape4Compatible) {
		// Netscape et al.
		overtureDocument.write(this.title+'<br><a href="'+this.clickURL+'" target="_blank"><font color="black">'+this.trimmedHost+'</font></a>');
	} else {	
		overtureDocument.write(this.title+'<br /><a style="color: black;" href="'+this.clickURL+'" target="_blank">'+this.trimmedHost+'</a>');
	}
	
	if(overtureCanDoMouseovers) {
		overtureDocument.write('</div>');
		overtureDocument.write('<div id="'+mouseOverId+'" style="z-index: 10000; width: 121px; visibility: hidden; background-color: #efefef; position: absolute; border-top: thin solid #cccccc; border-left: thin solid #cccccc; border-right: 2px solid black; border-bottom: 2px solid black;">'+this.description+'</div>');
	}
	overtureDocument.write('</font>');
	return 0;
}

// OvertureData constructor
function OvertureData(title, description, siteHost, clickURL) {
	this.title = title;
	this.description = description; 
	this.siteHost = siteHost; 
 	this.clickURL = clickURL;

	if (this.siteHost.indexOf('www.') == 0) {
		this.trimmedHost = this.siteHost.substring(4);
	} else {
		this.trimmedHost = this.siteHost;
	}
	
	// Trim overly long descriptions
	this.description = trimAndEllipses(this.description, 60);

	// Methods 
	this.renderData = overtureDataRenderFunction;
	return 0;
}

//
// OvertureError
//

function overtureErrorRenderFunction() {
	
		overtureDocument.writeln('<!-- Overture Error -- ' + this.errorMessage + ' -->');
	 return 0;
}

// Overture Error constructor
function OvertureError(errorMessage) {
	this.errorMessage = errorMessage;

	// methods
	this.renderData = overtureErrorRenderFunction;
	return 0;
}


//
// functions
//


// this function is called by the code generated by the Overture CGI
function renderOvertureDataArray(overtureDataArray, isSearch, displayMode) {
	switch(displayMode) {
	case 'dropdown' :
		// CSS for other browsers
		
		// unfortunately IE 5 doesn't do the right things with table cellpadding in CSS...
		overtureDocument.writeln('<table id="overtureResultTable" bgcolor="#efefd6" cellpadding="0" cellspacing="0" width="128" border="0">');
	
		overtureDocument.writeln('<tr style="background-color: #666666;"><th style="padding-left: 3px; padding-right: 1px; text-align: left;"><font color="white" face="Verdana,Geneva,Arial,sans-serif" size="2"><b>Advertiser links</b></font></th></tr>');
		var mouseOverId;
	
		for (var i=0;i < overtureDataArray.length;i++)
		{
			var data = overtureDataArray[i];
			overtureDocument.writeln('<tr style="background-color: #efefd6;"><td><img src="http://image.guardian.co.uk/sp.gif" height="2" width="128" /></td></tr>');
			overtureDocument.writeln('<tr style="background-color: #efefd6;">');
			overtureDocument.write('<td style="padding-left: 3px; padding-right: 1px; margin: 0px; width: 121px; text-overflow: clip; vertical-align: top;">');
	
			mouseOverId = 'overtureResult' + i;
			data.renderData(mouseOverId);
			overtureDocument.writeln('</td></tr>');		
	
			overtureDocument.writeln('<tr style="background-color: #efefd6;"><td><img src="http://image.guardian.co.uk/sp.gif" height="5" width="128" /></td></tr>');
			
			if(i < overtureDataArray.length-1) {
				overtureDocument.writeln('<tr style="background-color: #ffffff;"><td><img src="http://image.guardian.co.uk/sp.gif" height="2" width="128" /></td></tr>');
			}
		}
		
		overtureDocument.writeln('</table>');
	break;

	case 'trail':
		if (overtureDataArray.length > 1) {
			overtureDocument.writeln('<h1>Advertiser links </h1>');
			// Start index at 0 instead of 1, as slot 0 always contains an Overture 'house ad', which we don't display
			for (var i=1; i < overtureDataArray.length; i++)
			{
				var data = overtureDataArray[i];
				overtureDocument.writeln('<h2>' + data.title + '</h2>');
				overtureDocument.writeln('<p>' + data.description + '</p>');
				overtureDocument.writeln('<a href="' + data.clickURL + '">' + data.trimmedHost + '</a>');

			}
			overtureDocument.writeln('</font>');
		}
	break;

	}
	
	return 0;
}

function createOvertureDataArray (originalArray) {
	var newArray = new Array();
	var counter = 0;
	var title = '';
	var description = '';
	var siteHost = '';
	var clickURL = '';
	for (i in originalArray) {
		
		switch (counter) {
			case 0:
				description = originalArray[i];
				break;
			case 2:
				clickURL = originalArray[i];
				break;
			case 3:
				title = originalArray[i];
				break;
			case 4:
				siteHost = originalArray[i];
				break;
			case 5:
				var overtureObj = new OvertureData(title, description, siteHost, clickURL);
				newArray[newArray.length] = overtureObj;
				counter = -1;
		}
		
		counter++;
	}
	return newArray;
}

function overtureMouseOver(name) {
	if(overtureCanDoMouseovers) {
		overtureShow(name);
		if(overtureIsBadIEVersion) overtureResize(name,true);
	}
	return 0;
}

function overtureMouseOut(name) {
	if(overtureCanDoMouseovers) {
		overtureHide(name);
		if(overtureIsBadIEVersion) overtureResize(name,false);
	}
	return 0;
}

// called by iframe to set content of overture div
var overtureText;
function setOvertureContent(text, isSearch) {
	// Don't bother doing anything if there's no content to set
	if (text != '') {
		overtureText = text;
		if(overtureIsBadIEVersion) {
			window.setTimeout('setOvertureContent2(' + isSearch + ')',500);
		} else {
			setOvertureContent2(isSearch);
		}
	}
}

function setOvertureContent2(isSearch) {
	var obj = overtureGetElementById('OvertureDiv');
	var hldobj = overtureGetElementById('OvertureDivHolder');

	// Rendering after the event in Mac IE causes problems, so don't!
	if (!overtureIsMacIEVersion) {
		obj.innerHTML = overtureText;
		
		hldobj.style.display = 'block';
		hldobj.style.visibility = 'visible';
	}
}

function overtureFindPosY(obj)
{
	var curtop = 0;
	if (document.getElementById || document.all)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (document.layers)
		curtop += obj.y;
	return curtop;
}

// fix-up for IE 5.x's inability to have elements overlap frames
var overtureOriginalHeight = 0;
function overtureResize(name,expand) {
	var x = document.getElementById('overture');
	var y = document.getElementById(name);
	if(expand) {
		overtureOriginalHeight = x.offsetHeight;
		var xoff = overtureFindPosY(x);
		var yoff = overtureFindPosY(y);
		var diff = (yoff+y.offsetHeight) - (xoff+x.offsetHeight);
		if(diff > 0) {
			x.style.height = (x.offsetHeight + diff) + 'px';
		}
	} else {
		x.style.height = overtureOriginalHeight + 'px';
	}
}

// render iframe and script tags for creation of Overture box

function renderOvertureBox(overtureID, isSearch, displayMode, maxAdCount) {
	if(	!overtureIsFatalOperaVersion && 
		!overtureIsFatalMacIEVersion &&
		!overtureIsNetscape4Compatible) {

		document.writeln('<br />');
		// Use explicit host in CURL as we're calling this from other domains (e.g. search) than where this file lives
		var iframeSrc = "http://www.guardian.co.uk/external/overture/iframe/0,14478,,00.html?overtureID=" + overtureID + "&displayMode=" + displayMode + '&maxAdCount=' + maxAdCount + '&isSearch=' + isSearch;

		document.writeln('<iframe id="overtureIFrame" src="' + iframeSrc + '" height="0" width="128" frameborder="0" scrolling="no" marginwidth="0" marginheight="0" hspace="0" vspace="0">');
		document.writeln('</iframe>');
	}
	
	return 0;
}

var overtureIsNetscape4Compatible = (document.layers ? 1 : 0) == 1;
var overtureIsNetscape4 = overtureIsNetscape4Compatible && (navigator.userAgent.indexOf('Mozilla/4.') != -1) && (navigator.userAgent.indexOf('OmniWeb/4.') == -1);
var overtureIsIECompatible = (document.all ? 1 : 0) == 1;
var overtureIsBadIEVersion = overtureIsIECompatible && (navigator.userAgent.indexOf('MSIE 5') != -1);
var overtureIsMacIEVersion = overtureIsIECompatible && (navigator.platform.indexOf('Mac') != -1) && (navigator.userAgent.indexOf('MSIE 5') != -1) ;
var overtureIsFatalMacIEVersion = overtureIsIECompatible && (navigator.platform.indexOf('Mac') != -1) && ((navigator.userAgent.indexOf('MSIE 4.5') != -1));
var overtureIsFatalOperaVersion = (navigator.userAgent.indexOf('Opera') != -1);
var overtureIsDOM = !overtureIsIECompatible && (document.getElementById ? 1 : 0) == 1;
var overtureCanDoMouseovers = 0;
var overtureIsBadMacIEVersion = false;

if(overtureIsBadMacIEVersion) {
	// render simple version without rollovers
	overtureIsIECompatible = false;
	overtureIsNetscape4Compatible = true;
}

if (overtureIsDOM) {
	// use W3C DOM standards (or at least as much as is needed)
	overtureGetElementById = function(name) {
		return document.getElementById(name);
	}
} else {
	if(overtureIsIECompatible) {
		// use Microsoft IE 5 'standards'
		overtureGetElementById = function(name) {
			return document.all[name];
		}
	} else {
		if(overtureIsNetscape4Compatible) {
			overtureGetElementById = function(name) {
				return eval('document.'+name);
			}
		}
	}
}

if (overtureIsDOM || overtureIsIECompatible) {
	overtureHide = function(name) {
		overtureGetElementById(name).style.visibility = 'hidden';
	}
	overtureShow = function(name) {
		overtureGetElementById(name).style.visibility = 'visible';
	}
	
	overtureCanDoMouseovers = 1;
}

if(!overtureIsDOM && !overtureIsIECompatible) {
	// dummy functions for dummy browsers
	overtureHide = function(name) {return 0;}
	overtureShow = function(name) {return 0;}
	overtureGetElementById = function(name) {return 0;}
	overtureCanDoMouseovers = 0;
}