// a constant used to indicate a function that does nothing

var NOOP = function() {}



// ------------------------------------------------------------------------

//   Find the font family, size and face for the provided node in the

//   HTML dom.  The result object contains fontSize, fontFamily and

//   fontFace entries.

//

function findFont( obj )

{

	var result = new Object();

	if ( obj.currentStyle ) {

		result.fontSize = obj.currentStyle[ 'fontSize' ];

		result.fontFamily = obj.currentStyle[ 'fontFamily' ];

		result.fontFace = obj.currentStyle[ 'fontFace' ];

	} else if ( document.defaultView && document.defaultView.getComputedStyle ) {

		var computedStyle = document.defaultView.getComputedStyle( obj, "" );

		result.fontSize = computedStyle.getPropertyValue( 'font-size' );

		result.fontFamily = computedStyle.getPropertyValue( 'font-family' );

		result.fontFace = computedStyle.getPropertyValue( 'font-face' );

	}

	return result;

}



// ---------------------------------------------------------------------------



/*

	Find the bounds of the specified node in the DOM.  This returns

	an objct with x,y, height and width fields

*/

function findBounds( obj )

{

	var bounds = new Object();

	bounds.x = 0;

	bounds.y = 0;

	bounds.width = obj.scrollWidth;

	bounds.height = obj.scrollHeight;

	if( obj.x != null ) {

		bounds.x = obj.x;

		bounds.y = obj.y;

	}

	else {

		while( obj.offsetLeft != null ) {

			bounds.x += obj.offsetLeft;

			bounds.y += obj.offsetTop;

			if( obj.offsetParent ) {

				obj = obj.offsetParent;

			}

			else {

				break;

			}

		}

	}

			

	// subtract the amount the page is scrolled from position

	if (self.pageYOffset) // all except Explorer

	{

		bounds.x -= self.pageXOffset;

		bounds.y -= self.pageYOffset;

	}

	else if (document.documentElement && document.documentElement.scrollTop)

		// Explorer 6 Strict

	{

		bounds.x -= document.documentElement.scrollLeft;

		bounds.y -= document.documentElement.scrollTop;

	}

	else if (document.body) // all other Explorers

	{

		bounds.x -= document.body.scrollLeft;

		bounds.y -= document.body.scrollTop;

	}



	return bounds;

}



// ---------------------------------------------------------------------------



var isFirefoxPat = /Firefox\/([0-9]+)[.]([0-9]+)[.]([0-9]+)/;

var firFoxArr = isFirefoxPat.exec( navigator.userAgent );

var isSafariPat = /AppleWebKit\/([0-9]+)[.]([0-9]+)/;

var safariArr = isSafariPat.exec( navigator.userAgent );



// ---------------------------------------------------------------------------



/*

	Default implementation does nothing when viewing the webpage normally

*/

var clickTarget = NOOP;

var tellLightroomWhatImagesWeAreUsing = NOOP;



// ---------------------------------------------------------------------------



var callCallback = NOOP;



// ---------------------------------------------------------------------------



if( window.myCallback != null ){

	// We're being previewed on Mac.  Create a callback

	// function for communicating from the web page into Lightroom.

	callCallback = function() {

		// On Mac we use a special javascript to talk to Lightroom.

		var javascript = 'myCallback.' + arguments[ 0 ] + "( ";

		var j = arguments.length;

		var c = j - 1;

		for( var i = 1; i < j; i++ ) {

			var arg = arguments[ i ];

			if( typeof( arg ) == 'string' ) {

				javascript = javascript + '"' + arg + '"';

			}

			if( typeof( arg ) == 'number' ) {

				javascript = javascript + arg

			}

			if( typeof( arg ) == 'undefined' ) {

				javascript = javascript + 'undefined'

			}

			if( i < c ) {

				javascript = javascript + ", "

			}

		}

		javascript = javascript + " )"

		eval( javascript )

	}

}



// ---------------------------------------------------------------------------



else if( window.AgMode == 'preview' ) {

	// We're being previewed on Windows.  Create a callback

	// function for communicating from the web page into Lightroom.

	callCallback = function() {

		// On windows we use a special lua: URL to talk to Lightroom.

		var lua = arguments[ 0 ] + "( ";

		var j = arguments.length;

		var c = j - 1;

		for( var i = 1; i < j; i++ ) {

			var arg = arguments[ i ];

			if( typeof( arg ) == 'string' ) {

				lua = lua + '"' + arg + '"';

			}

			if( typeof( arg ) == 'number' ) {

				lua = lua + arg

			}

			if( typeof( arg ) == 'undefined' ) {

				lua = lua + 'undefined'

			}

			if( i < c ) {

				lua = lua + ", "

			}

		}

		lua = lua + ")"

		// alert( lua )

		location.href = "lua:" + lua

	}

}



// ---------------------------------------------------------------------------



/*

	Set up live feedback between Lightroom and the previewed web page.

*/

if( callCallback != NOOP ) {

	tellLightroomWhatImagesWeAreUsing = function() {



		if( window.myCallback != null ) {

			var imgElements = document.getElementsByTagName( "img" );

			var elsLen = imgElements.length;

			var result = new Array()

			for( i = 0; i < elsLen; i++ ) {

				var element = imgElements[ i ];

				var imageID = element.id;

				// for html validation purposes, we've prepended "ID" to the GUID for this

				// image, so now we strip that off.

				imageID = imageID.substring( 2 );

				result[ i ] = imageID;

			}

			myCallback.setUsedFiles( result );

		}

	}



	clickTarget = function( obj, target, imageID ) {

		if( imageID != null ) {

			// for html validation purposes, we've prepended "ID" to the GUID for this

			// image, so now we strip that off.

			imageID = imageID.substring( 2 );

		}

		var bounds = findBounds( obj );

		var font = findFont( obj );

		callCallback( 'inPlaceEdit', target, bounds.x, bounds.y, bounds.width, bounds.height, font.fontFamily, font.fontSize, imageID )

	}

}



// ---------------------------------------------------------------------------



if( firFoxArr && ( firFoxArr[1] > 1 || firFoxArr[2] > 4 ) ||

      safariArr ) {

	window.gridOn = NOOP;

	window.gridOff= NOOP;

}

else {

	window.gridOn = function( t, id ) {

		t.agOriginalClassName = t.className;

		t.className =  "selectedThumbnail " + t.className;

	};

	window.gridOff= function( t ) {

		t.className = t.agOriginalClassName;

	};

}



var needThumbImgLink = !isFirefoxPat;





var oldOnLoad = window.onload;

window.onload = function() {

	if( window.AgOnLoad ) {

		window.AgOnLoad();

	}

	if( oldOnLoad ) {

		oldOnLoad();

	}

}