var g_currenttabArray = new Array (1,1);		// Initialize array of active tabs (2 tables)
/*	---- variant for only one tabbed table:
var g_currenttabArray = new Array(1);
g_currenttabArray[0] = 1;
*/

/**
 * Switch the table tabs to the target tab number specified.
 * @param (Integer) number of the tabbed table used
 * @param {Integer} target Number of tab to switch to.
 * @author Hans-Peter Kuessner, SP Integration GmbH, www.sp-integration.de
 */
function spiSwitchTab(tablenumber, target)
{
	var elm_currencontent = $("tabcontent"+tablenumber+"_"+g_currenttabArray[tablenumber-1]);
	var elm_targetcontent = $("tabcontent"+tablenumber+"_"+target);
	var elm_currenttab = $("tab"+tablenumber+"_"+g_currenttabArray[tablenumber-1]);
	var elm_targettab = $("tab"+tablenumber+"_"+target);

	if (elm_currencontent && elm_targetcontent && elm_currenttab && elm_targettab)
	{
		elm_currencontent.style.display = "none";
		elm_targetcontent.style.display = "block";

		elm_currenttab.className = "inactive";
		elm_targettab.className = "active";

		elm_currenttab.blur();
		g_currenttabArray[tablenumber-1] = target;
		
		fetchTabContent (tablenumber, target);
	}
}

function fetchTabContent (tablenumber, tabnumber) {
	var strSetTabParameters = "var tablenumber = " + tablenumber + "; var tabnumber =" + tabnumber;
	var arrayName = "Tab" + tablenumber + "URLs";
	var URLarray = eval (arrayName);
	var dateNow = new Date();
	new Ajax.Request(
		URLarray[tabnumber-1]+"&time=" + dateNow.getTime(),				// add unique element to URL to prevent caching   
		{     method:'get',
			requestHeaders:['cache-control','no-cache', 'Pragma','no-cache'],     
			onSuccess: 
				function(transport){   
					try {    
						eval (strSetTabParameters);			// set tablenumber and tabnumber, to know about the target for this AJAX response
						var response = transport.responseText || "no response text";
						if (response.blank()) {		// no response contents = no feed contents at all
							strHTML = "(nothing found)";
						} else {					
				     		var objView= transport.responseXML.documentElement;
							if (! objView) {
								showfetchTabContentError (tablenumber, tabnumber, "Access to objView failed", response);
								return;
							}
							if (objView.tagName != "viewentries") {
								showfetchTabContentError (tablenumber, tabnumber, "Response from server is no view", response);
								return;
							}
							
							var objViewAttributes = objView.attributes;
							if (! objViewAttributes) {
								$("tabcontent"+tablenumber+"_"+tabnumber).innerHTML = "(nothing found)";
								return;		// no attributes --> empty view
							}
							var objTopLevelEntries = objViewAttributes.getNamedItem("toplevelentries");
							if (! objTopLevelEntries) {
								$("tabcontent"+tablenumber+"_"+tabnumber).innerHTML = "(nothing found)";
								return;		// no attributes --> empty view
							}							
							var totalCount = parseInt(objTopLevelEntries.value);
							if (! totalCount) {
								showfetchTabContentError (tablenumber, tabnumber, "Access to totalCount failed", response);
								return;
							}
							var objViewEntries = objView.getElementsByTagName("viewentry");
							if (! objViewEntries) {
								showfetchTabContentError (tablenumber, tabnumber, "Access to objViewEntries failed", response);
								return;
							}
							var count = objViewEntries.length;
							var strHTML = ""; 
							for (var row=0; row<count;row++) {
								var objEntry = objViewEntries[row];
								if (! objEntry) {
									showfetchTabContentError (tablenumber, tabnumber, "Access to objEntry failed", response);
									return;
								}
								var objColumns = objEntry.getElementsByTagName("entrydata");
								strHTML +="<p>" ;
								strHTML += "<span class=\"homepagefeedfirstline\">" + decodeURIComponent(fetchColumnText(objColumns,1)) + "</span>";
								strHTML+="<br>";
								var strCol2 = truncateToWords(decodeURIComponent(fetchColumnText(objColumns,2)), 160);
								var strCol3URL = fetchColumnText(objColumns,3);
								var strCol4Target = fetchColumnText(objColumns,4);
								var target = "";
								if (strCol3URL != "") {			// there is a URL
									if (getFeedTarget(tablenumber, tabnumber) == "append to URL") {
										if (strCol4Target != "") {			// document requests to be opened in another frame, ignore append to URL
											target = strCol4Target;		// the specified target
											strURL = strCol3URL;		// open just the specified URL
										} else {			// append to URL of page
											target = "_self";
											strURL = getFeedPageURL (tablenumber, tabnumber) + "?open&targeturl=" + strCol3URL;
										}
									} else {
										var target = getFeedTarget(tablenumber, tabnumber);
										strURL = strCol3URL;
									}
									strHTML += " <span class=\"homepagefeedsecondline\"><a target=\"" + target + "\" href=\"" +strURL + "\">" + strCol2 + "</a></span>";
								} else {
									strHTML +="<span class=\"homepagefeedsecondline\">" + strCol2 + "</span>";
								}

								strHTML += "</p>";
							} // next row
							if (totalCount > count) {			// more news avaliable, show link
								var strMoreLinkText = eval ("Tab" + tablenumber + "MoreLinkText");
								strHTML += "<a href=\"" + getFeedPageURL (tablenumber, tabnumber) + "\" target=\"_self\">" + strMoreLinkText + "</a>"
							}
						}
						$("tabcontent"+tablenumber+"_"+tabnumber).innerHTML = strHTML;
					} catch (e) {
						window.status=e;
						// alert (e);
					}
				},     
			onFailure: 
				function(){ 
					eval (strSetTabParameters);			// set tablenumber and tabnumber, to know about the target for this AJAX response
					var arrayName = "Tab" + tablenumber + "URLs";
					var URLarray = eval (arrayName);
					showfetchTabContentError (tablenumber, tabnumber, "Error processing URL " +URLarray[tabnumber-1], "" );
				} 
		}
	); 
}

function fetchColumnText (objColumns, colNumber) {
	try {
		if (objColumns.length < colNumber+1) {
			return ("");				// no column with this number
		} else {
			var objColumn = objColumns[colNumber];
			var objTextList = objColumn.getElementsByTagName("textlist")
			if (objTextList.length > 0) {
				var objText = objTextList[0].getElementsByTagName("text");
				return (objText[0].nodeValue || "")		// return "" if no value set (null in firefox)
			} else {
				var objText = objColumn.getElementsByTagName("text");
				return (objText[0].firstChild.nodeValue);				// only first entry if a list
			}

		}
	} catch (e) {
		window.status = e.description;
		// alert (e);
		return ("");
	}
}
function showfetchTabContentError (tablenumber, tabnumber, strErrorMessage, response) {
	var strHTML = strErrorMessage;
	if (response) {
		strHTML += "<br><br>Response:<br>" + response;
	}
	$("tabcontent"+tablenumber+"_"+tabnumber).innerHTML = strHTML;
}

function getFeedPageURL (tablenumber, tabnumber) {
	var array = eval ("Tab" + tablenumber + "PageURLs");
	return array [tabnumber-1];
}

function getFeedTarget (tablenumber, tabnumber) {
	var array = eval ("Tab" + tablenumber + "Targets");
	return array [tabnumber-1];
}

/*--- truncateToWords --- */
function truncateToWords (strInput, intMax) {
	if (strInput.length <= intMax) {
		return (strInput);
	}
	var intPos = intMax-4;
	while ((intPos >= 0) && (strInput.charAt(intPos) != " ")) {	// find first blank starting from end
		intPos--;
	} 
	if (intPos <= 5) {		// if the second word is toooooo long
		return (strInput.substr(0,intMax-3) + "...");
	} else {
		return (strInput.substr(0, intPos) + "...");
	}
}