// Wikipedia JavaScript support functions

// if this is true, the toolbar will no longer overwrite the infobox when you move the mouse over individual items
var noOverwrite=false;
var alertText;
var clientPC = navigator.userAgent.toLowerCase(); // Get client info
var is_gecko = ((clientPC.indexOf('gecko')!=-1) && (clientPC.indexOf('spoofer')==-1)
                && (clientPC.indexOf('khtml') == -1) && (clientPC.indexOf('netscape/7.0')==-1));
var is_safari = ((clientPC.indexOf('AppleWebKit')!=-1) && (clientPC.indexOf('spoofer')==-1));
var is_khtml = (navigator.vendor == 'KDE' || ( document.childNodes && !document.all && !navigator.taintEnabled ));
if (clientPC.indexOf('opera')!=-1) {
    var is_opera = true;
    var is_opera_seven = (window.opera && document.childNodes);
}

// add any onload functions in this hook (please don't hard-code any events in the xhtml source)
function onloadhook () {
    // don't run anything below this for non-dom browsers
    if(!(document.getElementById && document.getElementsByTagName)) return;
    histrowinit();
    unhidetzbutton();
    tabbedprefs();
}
if (window.addEventListener) window.addEventListener("load",onloadhook,false);
else if (window.attachEvent) window.attachEvent("onload",onloadhook);


// document.write special stylesheet links
function addcss ( stylepath ) {
    return;
}

// Un-trap us from framesets
if( window.top != window ) window.top.location = window.location;

// for enhanced RecentChanges
function toggleVisibility( _levelId, _otherId, _linkId) {
	var thisLevel = document.getElementById( _levelId );
	var otherLevel = document.getElementById( _otherId );
	var linkLevel = document.getElementById( _linkId );
	if ( thisLevel.style.display == 'none' ) {
		thisLevel.style.display = 'block';
		otherLevel.style.display = 'none';
		linkLevel.style.display = 'inline';
	} else {
		thisLevel.style.display = 'none';
		otherLevel.style.display = 'inline';
		linkLevel.style.display = 'none';
		}
}

// page history stuff
// attach event handlers to the input elements on history page
function histrowinit () {
    hf = document.getElementById('pagehistory');
    if(!hf) return;
    lis = hf.getElementsByTagName('LI');
    for (i=0;i<lis.length;i++) {
        inputs=lis[i].getElementsByTagName('INPUT');
        if(inputs[0] && inputs[1]) {
                inputs[0].onclick = diffcheck;
                inputs[1].onclick = diffcheck;
        }
    }
    diffcheck();
}
// check selection and tweak visibility/class onclick
function diffcheck() { 
    var dli = false; // the li where the diff radio is checked
    var oli = false; // the li where the oldid radio is checked
    hf = document.getElementById('pagehistory');
    if(!hf) return;
    lis = hf.getElementsByTagName('LI');
    for (i=0;i<lis.length;i++) {
        inputs=lis[i].getElementsByTagName('INPUT');
        if(inputs[1] && inputs[0]) {
            if(inputs[1].checked || inputs[0].checked) { // this row has a checked radio button
                if(inputs[1].checked && inputs[0].checked && inputs[0].value == inputs[1].value) return false;
                if(oli) { // it's the second checked radio
                    if(inputs[1].checked) {
                    oli.className = "selected";
                    return false 
                    }
                } else if (inputs[0].checked) {
                    return false;
                }
                if(inputs[0].checked) dli = lis[i];
                if(!oli) inputs[0].style.visibility = 'hidden';
                if(dli) inputs[1].style.visibility = 'hidden';
                lis[i].className = "selected";
                oli = lis[i];
            }  else { // no radio is checked in this row
                if(!oli) inputs[0].style.visibility = 'hidden';
                else inputs[0].style.visibility = 'visible';
                if(dli) inputs[1].style.visibility = 'hidden';
                else inputs[1].style.visibility = 'visible';
                lis[i].className = "";
            }
        }
    }
}

// generate toc from prefs form, fold sections
// XXX: needs testing on IE/Mac and safari
// more comments to follow
function tabbedprefs() {
    prefform = document.getElementById('preferences');
    if(!prefform || !document.createElement) return;
    prefform.className = prefform.className + 'jsprefs';
    var sections = new Array();
    children = prefform.childNodes;
    var seci = 0;
    for(i=0;i<children.length;i++) {
        if(children[i].nodeName.indexOf('FIELDSET') != -1) {
            children[i].id = 'prefsection-' + seci;
            children[i].className = 'prefsection';
            if(is_opera || is_khtml) children[i].className = 'prefsection operaprefsection';
            legends = children[i].getElementsByTagName('LEGEND');
            sections[seci] = new Object();
            if(legends[0] && legends[0].firstChild.nodeValue)
                sections[seci].text = legends[0].firstChild.nodeValue;
            else
                sections[seci].text = '# ' + seci;
            sections[seci].secid = children[i].id;
            seci++;
            if(sections.length != 1) children[i].style.display = 'none';
            else var selectedid = children[i].id;
        }
    }
    var toc = document.createElement('UL');
    toc.id = 'preftoc';
    toc.selectedid = selectedid;
    for(i=0;i<sections.length;i++) {
        var li = document.createElement('LI');
        if(i == 0) li.className = 'selected';
        var a =  document.createElement('A');
        a.href = '#' + sections[i].secid;
        a.onclick = uncoversection;
        a.innerHTML = sections[i].text;
        a.secid = sections[i].secid;
        li.appendChild(a);
        toc.appendChild(li);
    }
    prefform.insertBefore(toc, children[0]);
    document.getElementById('prefsubmit').id = 'prefcontrol';
}
function uncoversection() {
    oldsecid = this.parentNode.parentNode.selectedid;
    newsec = document.getElementById(this.secid);
    if(oldsecid != this.secid) {
        ul = document.getElementById('preftoc');
        document.getElementById(oldsecid).style.display = 'none';
        newsec.style.display = 'block';
        ul.selectedid = this.secid;
        lis = ul.getElementsByTagName('LI');
        for(i=0;i< lis.length;i++) {
            lis[i].className = '';
        }
        this.parentNode.className = 'selected';
    }
    return false;
}

// Timezone stuff
// tz in format [+-]HHMM
function checkTimezone( tz, msg ) {
	var localclock = new Date();
	// returns negative offset from GMT in minutes
	var tzRaw = localclock.getTimezoneOffset();
	var tzHour = Math.floor( Math.abs(tzRaw) / 60);
	var tzMin = Math.abs(tzRaw) % 60;
	var tzString = ((tzRaw >= 0) ? "-" : "+") + ((tzHour < 10) ? "0" : "") + tzHour + ((tzMin < 10) ? "0" : "") + tzMin;
	if( tz != tzString ) {
		var junk = msg.split( '$1' );
		document.write( junk[0] + "UTC" + tzString + junk[1] );
	}
}
function unhidetzbutton() {
    tzb = document.getElementById('guesstimezonebutton')
    if(tzb) tzb.style.display = 'inline';
}

// in [-]HH:MM format...
// won't yet work with non-even tzs
function fetchTimezone() {
	// FIXME: work around Safari bug
	var localclock = new Date();
	// returns negative offset from GMT in minutes
	var tzRaw = localclock.getTimezoneOffset();
	var tzHour = Math.floor( Math.abs(tzRaw) / 60);
	var tzMin = Math.abs(tzRaw) % 60;
	var tzString = ((tzRaw >= 0) ? "-" : "") + ((tzHour < 10) ? "0" : "") + tzHour +
		":" + ((tzMin < 10) ? "0" : "") + tzMin;
	return tzString;
}

function guessTimezone(box) {
	document.preferences.wpHourDiff.value = fetchTimezone();
}

function showTocToggle(show,hide) {
	if (document.getElementById) {
		document.writeln('<span class=\'toctoggle\'>[<a href="javascript:toggleToc()" class="internal">' +
		'<span id="showlink" style="display:none;">' + show + '</span>' +
		'<span id="hidelink">' + hide + '</span>'
		+ '</a>]</span>');
	}
}


function toggleToc() {
	var toc = document.getElementById('tocinside');
	var showlink=document.getElementById('showlink');
	var hidelink=document.getElementById('hidelink');
	if(toc.style.display == 'none') {
		toc.style.display = tocWas;
		hidelink.style.display='';
		showlink.style.display='none';

	} else {
		tocWas = toc.style.display;
		toc.style.display = 'none';
		hidelink.style.display='none';
		showlink.style.display='';

	}
}

// this function generates the actual toolbar buttons with localized text
// we use it to avoid creating the toolbar where javascript is not enabled
function addButton(imageFile, speedTip, tagOpen, tagClose, sampleText) {

	speedTip=escapeQuotes(speedTip);
	tagOpen=escapeQuotes(tagOpen);
	tagClose=escapeQuotes(tagClose);
	sampleText=escapeQuotes(sampleText);
	var mouseOver="";

	// we can't change the selection, so we show example texts
	// when moving the mouse instead, until the first button is clicked
	if(!document.selection && !is_gecko) {
		// filter backslashes so it can be shown in the infobox
		var re=new RegExp("\\\\n","g");
		tagOpen=tagOpen.replace(re,"");
		tagClose=tagClose.replace(re,"");
		mouseOver = "onMouseover=\"if(!noOverwrite){document.infoform.infobox.value='"+tagOpen+sampleText+tagClose+"'};\"";
	}

	document.write("<a href=\"javascript:insertTags");
	document.write("('"+tagOpen+"','"+tagClose+"','"+sampleText+"');\">");

        document.write("<img width=\"23\" height=\"22\" src=\""+imageFile+"\" border=\"0\" ALT=\""+speedTip+"\" TITLE=\""+speedTip+"\""+mouseOver+">");
	document.write("</a>");
	return;
}

function addInfobox(infoText,text_alert) {
	alertText=text_alert;
	var clientPC = navigator.userAgent.toLowerCase(); // Get client info

	var re=new RegExp("\\\\n","g");
	alertText=alertText.replace(re,"\n");

	// if no support for changing selection, add a small copy & paste field
	// document.selection is an IE-only property. The full toolbar works in IE and
	// Gecko-based browsers.
	if(!document.selection && !is_gecko) {
 		infoText=escapeQuotesHTML(infoText);
	 	document.write("<form name='infoform' id='infoform'>"+
			"<input size=80 id='infobox' name='infobox' value=\""+
			infoText+"\" READONLY></form>");
 	}

}

function escapeQuotes(text) {
	var re=new RegExp("'","g");
	text=text.replace(re,"\\'");
	re=new RegExp('"',"g");
	text=text.replace(re,'&quot;');
	re=new RegExp("\\n","g");
	text=text.replace(re,"\\n");
	return text;
}

function escapeQuotesHTML(text) {
	var re=new RegExp('"',"g");
	text=text.replace(re,"&quot;");
	return text;
}

// apply tagOpen/tagClose to selection in textarea,
// use sampleText instead of selection if there is none
// copied and adapted from phpBB
function insertTags(tagOpen, tagClose, sampleText) {

	var txtarea = document.editform.wpTextbox1;
	// IE
	if(document.selection  && !is_gecko) {
		var theSelection = document.selection.createRange().text;
		if(!theSelection) { theSelection=sampleText;}
		txtarea.focus();
		if(theSelection.charAt(theSelection.length - 1) == " "){// exclude ending space char, if any
			theSelection = theSelection.substring(0, theSelection.length - 1);
			document.selection.createRange().text = tagOpen + theSelection + tagClose + " ";
		} else {
			document.selection.createRange().text = tagOpen + theSelection + tagClose;
		}

	// Mozilla
	} else if(txtarea.selectionStart || txtarea.selectionStart == '0') {
 		var startPos = txtarea.selectionStart;
		var endPos = txtarea.selectionEnd;
		var scrollTop=txtarea.scrollTop;
		var myText = (txtarea.value).substring(startPos, endPos);
		if(!myText) { myText=sampleText;}
		if(myText.charAt(myText.length - 1) == " "){ // exclude ending space char, if any
			subst = tagOpen + myText.substring(0, (myText.length - 1)) + tagClose + " ";
		} else {
			subst = tagOpen + myText + tagClose;
		}
		txtarea.value = txtarea.value.substring(0, startPos) + subst +
		  txtarea.value.substring(endPos, txtarea.value.length);
		txtarea.focus();

		var cPos=startPos+(tagOpen.length+myText.length+tagClose.length);
		txtarea.selectionStart=cPos;
		txtarea.selectionEnd=cPos;
		txtarea.scrollTop=scrollTop;

	// All others
	} else {
		var copy_alertText=alertText;
		var re1=new RegExp("\\$1","g");
		var re2=new RegExp("\\$2","g");
		copy_alertText=copy_alertText.replace(re1,sampleText);
		copy_alertText=copy_alertText.replace(re2,tagOpen+sampleText+tagClose);
		var text;
		if (sampleText) {
			text=prompt(copy_alertText);
		} else {
			text="";
		}
		if(!text) { text=sampleText;}
		text=tagOpen+text+tagClose;
		document.infoform.infobox.value=text;
		// in Safari this causes scrolling
		if(!is_safari) {
			txtarea.focus();
		}
		noOverwrite=true;
	}
	// reposition cursor if possible
	if (txtarea.createTextRange) txtarea.caretPos = document.selection.createRange().duplicate();
}