// JavaScript 
/**
 * Custom inital load handler. Called when the carousel loads the initial
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadInitHandler
 */
var fxArray = new Array();
var loadInitialItems = function(type, args) {

	var start = args[0];
	var last = args[1]; 

	showButtons();
	this.setProperty("size", 8,true);
};

/**
 * Custom load next handler. Called when the carousel loads the next
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadNextHandler
 */
var loadNextItems = function(type, args) {	



};

/**
 * Custom load previous handler. Called when the carousel loads the previous
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadPrevHandler
 */
var loadPrevItems = function(type, args) {
	var start = args[0];
	var last = args[1]; 
	var alreadyCached = args[2];

};

/**
 * Custom button state handler for enabling/disabling button state. 
 * Called when the carousel has determined that the previous button
 * state should be changed.
 * Specified to the carousel as the configuration
 * parameter: prevButtonStateHandler
 */
var handlePrevButtonState = function(type, args) {

	var enabling = args[0];
	var leftImage = args[1];
	if(enabling) {
		leftImage.src = "fileadmin/FutureOcean/img/left-enabled.gif";	
	} else {
		leftImage.src = "fileadmin/FutureOcean/img/left-disabled.gif";	
	}
};

var handleNextButtonState = function(type, args) {
	var enabling = args[0];
	var rightImage = args[1];

	if(enabling) {
		rightImage.src = "fileadmin/FutureOcean/img/right-enabled.gif";
	} else {
		rightImage.src = "fileadmin/FutureOcean/img/right-disabled.gif";
	}
};

var showButtons = function(type, args) {
	YAHOO.util.Dom.setStyle("next-arrow", "visibility", "visible");
	YAHOO.util.Dom.setStyle("prev-arrow", "visibility", "visible");
};


/**
 * You must create the carousel after the page is loaded since it is
 * dependent on an HTML element (in this case 'dhtml-carousel'.) See the
 * HTML code below.
 */
var carousel; // for ease of debugging; globals generally not a good idea

var pageLoad = function() 
{
	carousel = new YAHOO.extension.Carousel("dhtml-carousel", 
		{
			numVisible:        4,
			animationSpeed:    0.4,
			scrollInc:         1,
			loadInitHandler:   loadInitialItems,
			prevElement:       "prev-arrow",
			nextElement:       "next-arrow",
			loadNextHandler:   loadNextItems,
			loadPrevHandler:   loadPrevItems,
			prevButtonStateHandler:   handlePrevButtonState,
			nextButtonStateHandler:   handleNextButtonState
		}
	);
};

YAHOO.util.Event.addListener(window, 'load', pageLoad);

/**
 * Called via the YUI Connection manager (see makeRequest).
 */
var handleSuccess = function(callbackResponse)
{
	var start = callbackResponse.argument[0];
	var numResults = callbackResponse.argument[1];
	var carousel = callbackResponse.argument[2];
	if(callbackResponse.responseText !== undefined) {
		var theTeaser = eval( '(' + callbackResponse.responseText + ')' );
		var len = theTeaser.ResultSet.Result.length; 

		showButtons();
	 }
};

/**
 * Since carousel.addItem uses an HTML string to create the interface
 * for each carousel item, this method takes an individual trip plan
 * result and cobbles together HTML for the innerHTML argument.
 */
var teaserHandleMouseOver = function(tid){
	fxArray[tid].start();
	return false;
}
var fmtTripInnerHTML = function(result,i) {
	var tripInnerHTML =
		'<a href="' + 
		result.Teaser.Url + 
		'" id="glo'+i+'" class="teaser_txt" onmouseover="teaserHandleMouseOver('+i+')"><div><img src="' + 
		result.Teaser.Src +
		'"   title="'+result.Teaser.Title+'"  class="teaser" border="0"  id="teaserimg'+i+'"/><h1  class="teaser">' + trunc(result.Teaser.Title, 40, 20) + 
		'</h1><span class="teasercopy">' + 	result.Teaser.Summary + '<b class="teaser"> | mehr...</b></span></div<\/a>';
	return tripInnerHTML;
};

var handleFailure = function(o)
{
	 var result = o.status + " " + o.statusText;
	 alert("Transaction failed.  The error is: " + result);
};

/**
 * A utility function for invoking the YUI connection manager (Ajax)
 * with a URL that matches the Yahoo! developer network Trip Planner
 * APIs (see: http://developer.yahoo.com/travel/tripservice/V1/tripSearch.html)
 *
 * The callback object is the configuration object for the YUI Connection
 * manager. If this is successful, the 'handleSuccess' function is called.
 */
var makeRequest = function(carousel, url, query, start, numResults)
{
	var params = '?query=' + query + 
							'&start=' + start + 
							'&results=' + numResults; 

	var callback =
	{
		success: handleSuccess,
		failure: handleFailure,
		argument: [start, numResults, carousel]
	};

	var sUrl = url + params; 
	YAHOO.util.Connect.asyncRequest("GET", sUrl, callback, null);
};

/**
 * Just a utility function for cleaning up the returned HTML response
 * and truncating it.
 */
var trunc = function(str, maxLen, maxWordLen) 
{
	// Strip markup
	str = str.replace("<b>", "");
	str = str.replace("<\/b>", "");
	str = str.replace("<B>", "");
	str = str.replace("<\/B>", "");

	// Simple truncation
	if(str.length > maxLen) {
		str = str.substring(0,maxLen) + "...";
	}

	// Truncate for long words
	var start = 0;
	var loopCnt = 0;
	var strSlice = str;

	do  {
		var spaceBreak = strSlice.indexOf(' ');
		var lenOfWord = spaceBreak;
		if(lenOfWord == -1)
		{
			lenOfWord = strSlice.length;
		}

		if (lenOfWord > maxWordLen) {
			//debugMsg("Long word found in: " + strSlice);
			str = str.substring(0, maxWordLen);  // TRUNCATE
		}
		start = spaceBreak+1;
		strSlice = strSlice.substring(start);
		spaceBreak = strSlice.indexOf(' ');
	} while(spaceBreak != -1)
	return str;
};