/*
 * 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));
}