/*
 * This file contains functions to generate OBJECT and EMBED tags for QuickTime content. 
 */

/************** LOCALIZABLE GLOBAL VARIABLES ****************/

var gArgCountErr =	'The "%%" function requires an even number of arguments.'
+	'\nArguments should be in the form "atttributeName", "attributeValue", ...';

	/******************** END LOCALIZABLE **********************/

	var gTagAttrs				= null;
	var gQTGeneratorVersion		= 1.0;

	function AC_QuickTimeVersion()	{ return gQTGeneratorVersion; }

	function _QTComplain(callingFcnName, errMsg)
{
		errMsg = errMsg.replace("%%", callingFcnName);
		alert(errMsg);
}

function _QTAddAttribute(prefix, slotName, tagName)
{
	var		value;
	
	value = gTagAttrs[prefix + slotName];
	if ( null == value )
		value = gTagAttrs[slotName];
	
	if ( null != value )
	{
		if ( 0 == slotName.indexOf(prefix) && (null == tagName) )
			tagName = slotName.substring(prefix.length); 
		if ( null == tagName ) 
			tagName = slotName;
		return tagName + '="' + value + '" ';
	}
	else
		return "";
}

function _QTAddObjectAttr(slotName, tagName)
{
	// don't bother if it is only for the embed tag
	if ( 0 == slotName.indexOf("emb#") )
		return "";
	
	if ( 0 == slotName.indexOf("obj#") && (null == tagName) )
		tagName = slotName.substring(4); 
	
	return _QTAddAttribute("obj#", slotName, tagName);
}

function _QTAddEmbedAttr(slotName, tagName)
{
	// don't bother if it is only for the object tag
	if ( 0 == slotName.indexOf("obj#") )
		return "";
	
	if ( 0 == slotName.indexOf("emb#") && (null == tagName) )
		tagName = slotName.substring(4); 
	
	return _QTAddAttribute("emb#", slotName, tagName);
}


function _QTAddObjectParam(slotName, generateXHTML)
{
	var		paramValue;
	var		paramStr = "";
	var		endTagChar = (generateXHTML) ? ' />' : '>';
	
	if ( -1 == slotName.indexOf("emb#") )
	{
		// look for the OBJECT-only param first. if there is none, look for a generic one
		paramValue = gTagAttrs["obj#" + slotName];
		if ( null == paramValue )
			paramValue = gTagAttrs[slotName];
		
		if ( 0 == slotName.indexOf("obj#") )
			slotName = slotName.substring(4); 
		
		if ( null != paramValue )
			paramStr = '  <param name="' + slotName + '" value="' + paramValue + '"' + endTagChar + '\n';
	}

return paramStr;
}

function _QTDeleteTagAttrs()
{
	for ( var ndx = 0; ndx < arguments.length; ndx++ )
	{
		var attrName = arguments[ndx];
		delete gTagAttrs[attrName];
		delete gTagAttrs["emb#" + attrName];
		delete gTagAttrs["obj#" + attrName];
	}
}



// generate an embed and object tag, return as a string
function _QTGenerate(callingFcnName, generateXHTML, args)
{
	// is the number of optional arguments even?
	if ( args.length < 4 || (0 != (args.length % 2)) )
	{
		_QTComplain(callingFcnName, gArgCountErr);
		return "";
	}
	
	// allocate an array, fill in the required attributes with fixed place params and defaults
	gTagAttrs = new Array();
	gTagAttrs["src"] = args[0];
	gTagAttrs["width"] = args[1];
	gTagAttrs["height"] = args[2];
	gTagAttrs["classid"] = "clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B";
	gTagAttrs["pluginspage"] = "http://www.apple.com/quicktime/download/";
	
	// set up codebase attribute with specified or default version before parsing args so
	//  anything passed in will override
	var activexVers = args[3]
		if ( (null == activexVers) || ("" == activexVers) )
			activexVers = "6,0,2,0";
	gTagAttrs["codebase"] = "http://www.apple.com/qtactivex/qtplugin.cab#version=" + activexVers;
	
	var	attrName,
		attrValue;
	
	// add all of the optional attributes to the array
	for ( var ndx = 4; ndx < args.length; ndx += 2)
	{
		attrName = args[ndx].toLowerCase();
		attrValue = args[ndx + 1];
		
		// "name" and "id" should have the same value, the former goes in the embed and the later goes in
		//  the object. use one array slot 
		if ( "name" == attrName || "id" == attrName )
			gTagAttrs["name"] = attrValue;
		
		else 
			gTagAttrs[attrName] = attrValue;
	}
	
	// init both tags with the required and "special" attributes
	var objTag =  '<object '
		+ _QTAddObjectAttr("classid")
		+ _QTAddObjectAttr("width")
		+ _QTAddObjectAttr("height")
		+ _QTAddObjectAttr("codebase")
		+ _QTAddObjectAttr("name", "id")
		+ _QTAddObjectAttr("tabindex")
		+ _QTAddObjectAttr("hspace")
		+ _QTAddObjectAttr("vspace")
		+ _QTAddObjectAttr("border")
		+ _QTAddObjectAttr("align")
		+ _QTAddObjectAttr("class")
		+ _QTAddObjectAttr("title")
		+ _QTAddObjectAttr("accesskey")
		+ _QTAddObjectAttr("noexternaldata")
		+ '>\n'
		+ _QTAddObjectParam("src", generateXHTML);
	var embedTag = '  <embed '
		+ _QTAddEmbedAttr("src")
		+ _QTAddEmbedAttr("width")
		+ _QTAddEmbedAttr("height")
		+ _QTAddEmbedAttr("pluginspage")
		+ _QTAddEmbedAttr("name")
		+ _QTAddEmbedAttr("align")
		+ _QTAddEmbedAttr("tabindex");
	
	// delete the attributes/params we have already added
	_QTDeleteTagAttrs("src","width","height","pluginspage","classid","codebase","name","tabindex",
					  "hspace","vspace","border","align","noexternaldata","class","title","accesskey");
	
	// and finally, add all of the remaining attributes to the embed and object
	for ( var attrName in gTagAttrs )
	{
		attrValue = gTagAttrs[attrName];
		if ( null != attrValue )
		{
			embedTag += _QTAddEmbedAttr(attrName);
			objTag += _QTAddObjectParam(attrName, generateXHTML);
		}
	} 
	
	// end both tags, we're done
	return objTag + embedTag + '> </em' + 'bed>\n</ob' + 'ject' + '>';
}

// return the object/embed as a string
function QT_GenerateOBJECTText()
{
	return _QTGenerate("QT_GenerateOBJECTText", false, arguments);
}

function QT_GenerateOBJECTText_XHTML()
{
	return _QTGenerate("QT_GenerateOBJECTText_XHTML", true, arguments);
}

function QT_WriteOBJECT()
{
	document.writeln(_QTGenerate("QT_WriteOBJECT", false, arguments));
}

function QT_WriteOBJECT_XHTML()
{
	document.writeln(_QTGenerate("QT_WriteOBJECT_XHTML", true, arguments));
}