/*
// Based on Bitflux live search code, adapted to be used for a list returned
// by the search which is the first level of a live tree.
// Live tree code by fps@semanlink.net
// Other modifications (2007/12) to get it working with ie7
//
// Copyright notice of original code:
// +----------------------------------------------------------------------+
// | Copyright (c) 2004 Bitflux GmbH                                      |
// +----------------------------------------------------------------------+
// | Licensed under the Apache License, Version 2.0 (the "License");      |
// | you may not use this file except in compliance with the License.     |
// | You may obtain a copy of the License at                              |
// | http://www.apache.org/licenses/LICENSE-2.0                           |
// | Unless required by applicable law or agreed to in writing, software  |
// | distributed under the License is distributed on an "AS IS" BASIS,    |
// | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or      |
// | implied. See the License for the specific language governing         |
// | permissions and limitations under the License.                       |
// +----------------------------------------------------------------------+
// | Author: Bitflux GmbH <devel@bitflux.ch>                              |
// +----------------------------------------------------------------------+

//  some of modifs are marked with // fps

uses :
- the result list (UL) has id LiveSearchRes
- LSHighlight css id is used to highlight the selected LI tag of list
- each LI supposed to contain a <A> tag as SECOND child
- body onload : liveSearchInit
- livesearchform.jsp with elements id : livesearch, LSRes LSShadow,...
- livesearchxml.jsp (which includes livetreesons.jsp)
- script liveSearchAction defined in template.jsp

Sur les arbres (et highlight) : beaucoup repose sur le frere du frere du fils next fils, etc...
Ne serait-il pas possible et plus simple de se baser uniquement sur l'identifiant ala 1.1.1.2
de la ligne ? we would have more freedom for content

*/
liveSearchReq = false;
var t = null;
var liveSearchLast = "";
var lastRightArrowTime = 0;

var lastValueOnReturn = null;
var nosearch = false;
	
isIE = false;

// on !IE we only have to initialize it once
// but beware, the test (window.XMLHttpRequest) is true with ie7
// and ie7 needs initialisation for each request
/*if (window.XMLHttpRequest) {
	liveSearchReq = new XMLHttpRequest();
}*/
function needsOnlyOneXMLHttpRequestInit() {
	if (window.ActiveXObject) {
		return false;
	} else if (window.XMLHttpRequest) {
		return true;
	}
}
if (needsOnlyOneXMLHttpRequestInit()) {
	liveSearchReq = new XMLHttpRequest();
}


function liveSearchInit() {
	var livesearchElt = document.getElementById('livesearch');
	if (livesearchElt.addEventListener) {
		if (navigator.userAgent.indexOf("Safari") > 0) {
			livesearchElt.addEventListener("keydown",liveSearchKeyPress,false); // for safari
		} else {
			livesearchElt.addEventListener("keypress",liveSearchKeyPress,false); // for gecko
		}
	} else if (livesearchElt.attachEvent) {
		livesearchElt.attachEvent('onkeydown',liveSearchKeyPress);
		isIE = true;
	} else {
		alert("Unable to add event listener");
	}
	livesearchElt.setAttribute("autocomplete","off");
}

function liveSearchHideDelayed() {
	window.setTimeout("liveSearchHide()",400);
}
	
function liveSearchHide() {
	document.getElementById("LSResult").style.display = "none";
	var highlight = document.getElementById("LSHighlight");
	if (highlight) {
		highlight.removeAttribute("id");
	}
}

function liveSearchKeyPress(event) {
	// alert("liveSearchKeyPress " + event.keyCode);
	/*if (event.keyCode == 13 ) {
		// ENTER
		highlight = document.getElementById("LSHighlight");
		alert(highlight);
		if (!highlight) {
			highlight = firstResLi();
			alert(highlight);
		}
		if (!isIE) { event.preventDefault(); }
	} else */
	if (event.keyCode == 40 ) {
		//KEY DOWN
		highlight = document.getElementById("LSHighlight");
		if (!highlight) {
			highlight = firstResLi();
		} else {
			highlight.removeAttribute("id");
			highlight = tree_nextLi(highlight);
		}
		if (highlight) {
			highlight.setAttribute("id","LSHighlight");
		}
		if (!isIE) { event.preventDefault(); }
	} else if (event.keyCode == 38 ) {
		//KEY UP
		highlight = document.getElementById("LSHighlight");
		if (!highlight) {
			highlight = lastResLi();
		} else {
			highlight.removeAttribute("id");
			highlight = tree_prevLi(highlight);
		}
		if (highlight) {
			highlight.setAttribute("id","LSHighlight");
		}
		if (!isIE) { event.preventDefault(); }
	} else if (event.keyCode == 27) {
		//ESC
		highlight = document.getElementById("LSHighlight");
		if (highlight) {
			highlight.removeAttribute("id");
		}
		document.getElementById("LSResult").style.display = "none";
	} else if (event.keyCode == 39) {
		// Right arrow
		// There's a problrm with Safari (2): code is executed twice (generally at least)
		// hence that trick :
		now = (new Date()).getTime();
		// alert(now + "/" + lastRightArrowTime);
		if (now - lastRightArrowTime > 200) {
			highlight = document.getElementById("LSHighlight");
			if (highlight) {
				// alert ("highlight " + highlight.id + "/" + highlight.name);
				/* OK, juste pour le premier niveau
				highlight.removeAttribute("id");
				highlight.firstChild.onclick();
				*/
				ul = tree_ulInsideLi(highlight);
				son = ul.firstChild;
				var alreadyLoaded = son;
				if (alreadyLoaded) {
					alreadyLoaded = (son.innerHTML != "");
				}
				/*
				alert( highlight.firstChild.nextSibling); // a href
				alert(ul); // UL
				alert( highlight.firstChild.nextSibling.nextSibling.firstChild); //  text
				*/
				if (alreadyLoaded) { // son already loaded
					highlight.removeAttribute("id"); // set the hilite to false
					if ((ul.style.display == "")||(ul.style.display == "block")) {
					} else { // "none", tree is closed. Click to open it
						highlight.firstChild.onclick();
					}
					highlight = son.nextSibling; // LI
					if (!highlight) highlight = son; // ie
					highlight.setAttribute("id","LSHighlight");
				} else { // son not loaded yet.
					// Click on image to open and donwload son
					highlight.firstChild.onclick();
					// To hilite the son, we must wait for the server reply
					// That's why we do not set the hilite to false now:
					// searching for the LSHighlight in the onclick handler
					// will alow us to know whether we have to hilite the first of the downloaded lines.
				}
			}
		}
		lastRightArrowTime = now;
	} else if (event.keyCode == 8) {
		// the onkeypress of input field not fired when clicking back in ie7
		if (isIE) liveSearchStart();
	}
}

/** tcf onkeypress="liveSearchStart()" of input field */
function liveSearchStart() {
	// alert("liveSearchStart nosearch" + nosearch);
	// if (!nosearch) { // ???
		if (t) {
			window.clearTimeout(t);
		}
		t = window.setTimeout("liveSearchDoSearch()",200);
	// }
}

function liveSearchDoSearch() {
	// alert("liveSearchDoSearch");
	/*if (typeof liveSearchRoot == "undefined") {
		liveSearchRoot = "";
	}
	if (typeof liveSearchRootSubDir == "undefined") {
		liveSearchRootSubDir = "";
	}*/
	if (typeof liveSearchParams == "undefined") {
		liveSearchParams = "";
	}
	if (liveSearchLast != document.forms.searchform.q.value) {
		if (!nosearch) {
			if (liveSearchReq && liveSearchReq.readyState < 4) {
				liveSearchReq.abort();
			}
			if ( document.forms.searchform.q.value == "") {
				liveSearchHide();
				return false;
			}
			// fps
			// This is not OK with ie7, which return true on window.XMLHttpRequest
			// but requires however a new init of request every time
			/*
			if (window.XMLHttpRequest) {
			// branch for IE/Windows ActiveX version
			} else if (window.ActiveXObject) {
				liveSearchReq = new ActiveXObject("Microsoft.XMLHTTP");
			}
			*/
			if (!needsOnlyOneXMLHttpRequestInit()) {
				try {
					liveSearchReq = new ActiveXObject("Msxml2.XMLHTTP");
				} catch (e) {
					try {
						liveSearchReq = new ActiveXObject("Microsoft.XMLHTTP");
					} catch(e) {
						alert("Ajax not available");
					}
				}
			}
			liveSearchReq.onreadystatechange= liveSearchProcessReqChange;
			// fps 
			// with following line, problem with non ascii characters.
			// liveSearchReq.open("GET", liveSearchRoot + "/semanlink/livesearch.do?text=" + document.forms.searchform.q.value + liveSearchParams);
			// This way, non ascii characters are decoded OK with URLEncoder.decode(request.getParameter("text"))
			// (same trick in the SL bookmarklet)
			// BEWARE to url rewriting ! This is not good if url rewriting necessary
			// liveSearchReq.open("GET", liveSearchRoot + "/semanlink/livesearch.do?text=" + encodeURIComponent(encodeURIComponent(document.forms.searchform.q.value)) + liveSearchParams);
			url = liveSearchAction(); // defini dans template.jsp
			url = url + "?text=" + encodeURIComponent(encodeURIComponent(document.forms.searchform.q.value)) + liveSearchParams;
			liveSearchReq.open("GET", url);
			liveSearchLast = document.forms.searchform.q.value;
			liveSearchReq.send(null);
		}
	}
	nosearch = false;
}

function liveSearchProcessReqChange() {
	
	if (liveSearchReq.readyState == 4) {
		var  res = document.getElementById("LSResult");
		res.style.display = "block";
		var  sh = document.getElementById("LSShadow");
		
		sh.innerHTML = liveSearchReq.responseText;
		///////
		// highlight = firstResLi();
		// @see livetreesons.jsp : from highlighted <LI> to link (LI includes an image before the <a> tag )
		// if ((highlight) && (highlight.firstChild) && (highlight.firstChild.nextSibling)) {
			// highlight.setAttribute("id","LSHighlight");
		//}
		///////		 
	}
}

// 2 methodes differentes peuvent etre invoquees par livesearchform au moment du clic selon qu'on est
// en get (go kw) ou en post (add kw)
function liveSearchSubmit4Get() {
	// var highlight = getResult();
	highlight = document.getElementById("LSHighlight");
	if (highlight) {
		// SIMPLE SOLUTION : same as clicking the link of the highlighted line (or first line if none is selected).
		// THIS WORKS FINE to follow the link (but do not allow to do any kind of other action)
		// (this directly sets the window.location. Searchform is not invoked.
		window.location = highlight.firstChild.nextSibling.getAttribute("href");
		return false; // Searchform is not invoked.
		
		// CECI MARCHE AUSSI : on set l'action de la form et on l'invoque
		// document.searchform.action = highlight.firstChild.nextSibling.getAttribute("href"); // attention pour le moment href est showkw?... (maintenant, ça doit être /semanlink/tag/... -- avec l'éventuelle session de l'url rewriting
		// return true; // let the searchform do the get
	} else {
		//  nothing highlighted (nor a line in list) -> action defined in searchform
		//  Has to handle case of a search without result
		// return true;
		highlight = safeFirstResLi();
		if (highlight) {
			highlight.setAttribute("id","LSHighlight");
		}
		return false; // Searchform is not invoked.
	}
}
function liveSearchSubmit4Post() {
	// var highlight = getResult();
	highlight = document.getElementById("LSHighlight");
	if (highlight) {
		// si il s'agit d'ajouter un tag (mode edit), on demande confirmation
		// En mode edit, il y a un pulldown menu permettant de choisir add 2 parents, ...
		// Donc, si ce pulldown n'est pas present, ne pas afficher de dialogue de confirmation
		if (document.searchform.actionprop) {
			// maintenant, on ne voudrait pas afficher de dialogue de confirmation si c'est go qui est choisi
			if (!(askConfirmation())) return false;
		}

		// SIMPLE SOLUTION : same as clicking the link of the highlighted line (or first line if none is selected).
		// THIS WORKS FINE to follow the link (but do not allow to do any kind of other action)
		// (this directly sets the window.location. Searchform is not invoked.
		// window.location = highlight.firstChild.nextSibling.getAttribute("href");
		// return false; // Searchform is not invoked.
		
		// THIS sets an hidden value of searchform with the "href" and let the searchform do the post
		// note href looks like: /semanlink/tag/... -- with sessionId of url rewriting, if any
		// alert(highlight.firstChild.nextSibling.getAttribute("href"));
		document.searchform.kwhref.value = highlight.firstChild.nextSibling.getAttribute("href"); // href: /semanlink/tag/... -- avec l'éventuelle session de l'url rewriting
		return true; // let the searchform do the post
	} else {
		//  nothing highlighted (nor a line in list) -> action defined in searchform
		//  Has to handle case of a search without result
		// return true;

		highlight = safeFirstResLi();
		if (highlight) { // if there is a line in the list
			//  With usual (not live) search,the user type some chars, and hit return to do the search
			// we do not want in this case to add a new tag, or add the first line
			// document.forms.searchform.q.value = highlight.firstChild.nextSibling.text;
			if (document.forms.searchform.q.value != lastValueOnReturn) {
				// keep record of value of input field when return has been hit
				lastValueOnReturn = document.forms.searchform.q.value;
				// set the input field to text of first tag in returned list
				nosearch = true; // trick to prevent doing search now (this search is useless, and it would prevent highlighting of line that would be reseted immediately)
				document.forms.searchform.q.value = highlight.firstChild.nextSibling.text;
				highlight.setAttribute("id","LSHighlight"); // would't work (reseted immediatly by search) without "nosearch" trick
			} else {
				// the user hit return again with the same content in input field:
				// he really wants it
				if (!(askConfirmation())) return false;
				return true; // let the searchform do the post
			}
			
			return false; // Searchform is not invoked.
		} else {
			// no value corresponding to the input
			// invoke searcfform on the content of the input field
			if (!(askConfirmation())) return false;
			return true; // let the searchform do the post
		}

	}
}

function askConfirmation() {
	// no confirmation dialog when "go" is selected
	if (document.forms.searchform.actionprop.value == "go") return true;
	return window.confirm('Add this tag?');
}

function getResult() {
	var highlight = document.getElementById("LSHighlight");
	if (!highlight) {
			highlight = firstResLi();
	}
	// @see livetreesons.jsp : from highlighted <LI> to link (LI includes an image before the <a> tag )
	if ((highlight) && (highlight.firstChild) && (highlight.firstChild.nextSibling)) {
		return highlight;
	} else {
		return false;
	}
}

/** this function gets called when clicking on a tag of the livesearch form results when editing is on
 * @param tagHRef: /semanlink/tag/... */
function postTag(tagHRef) {
	if (!(askConfirmation())) return false;
	document.searchform.kwhref.value = tagHRef;
	document.searchform.submit();
}

/** returns the first <LI> of result
 *  Doesn't check that the result is not null @see safeFirstResLi
 */
function firstResLi() {
	if (isIE) {
		return document.getElementById("LiveSearchRes").firstChild;
	} else {
		return document.getElementById("LiveSearchRes").firstChild.nextSibling;
	}
}

/** returns the first <LI> of result or null if result is "" */
function safeFirstResLi() {
	ul = document.getElementById("LiveSearchRes");
	if (!ul) return null;
	if (isIE) {
		return ul.firstChild;
	} else {
		return ul.firstChild.nextSibling;
	}
}


function lastResLi() {
	if (isIE) {
		return document.getElementById("LiveSearchRes").lastChild;
	} else {
		return document.getElementById("LiveSearchRes").lastChild.previousSibling; // li
	}
}

function tree_ulInsideLi(li) {
	/*if (isIE) {
		return li.firstChild.nextSibling;
	} else {*/
		return li.firstChild.nextSibling.nextSibling;
	//}
}

function lineId(li) {
	x = li.firstChild.id; // "trigger:1_1"
	x = x.substring(x.indexOf(":") + 1);
	// alert("lineId :" + x);
	return x;
}

function upInTree(li) {
	liid = lineId(li);
	if (!liid) {
		x = null;
	} else if (liid.indexOf("_") < 0) {
		x = null;
		// alert("upInTree : null");
	} else {
		items = liid.split("_");
		parentId = items[0];
		k = 1;
		while(k < items.length - 1) {
			parentId = parentId + "_" + items[k];
			k = k+1;
		}
		parentUL = document.getElementById("block:" + parentId);
		parentLI = parentUL.parentNode; // la ligne parente
		x = parentLI;
		// alert("upInTree2 : " + x + " : " + parentId);
	}
	return x;
}

function tree_nextLi(li) {
	nextLi = li.nextSibling;
	// normaly, the test : (!nextLi) should say whether we are on the first line or not,
	// but this doesn't work, because there is a Text object between the last LI and the /UL
	// hence this test :
	if ((!nextLi) || (!nextLi.firstChild)) { // last line
		parentLi = upInTree(li);
		if (parentLi) {
			uncleLi = parentLi.nextSibling;
			if (!uncleLi) {
				x = tree_nextLi(parentLi);
			} else {
				x = uncleLi;
			}
		} else {
			x = firstResLi();
		}
	} else {
		x = nextLi;
	}
	// alert("tree_nextLi : " + x);
	return x;
}


function tree_prevLi(li) {
	prevli = li.previousSibling;
	// normaly, the test : (!prevli) should say whether we are on the first line or not,
	// but this doesn't work, because there is a Text object between the UL and the first LI.
	// hence this test :
	if ((!prevli) || (!prevli.firstChild)) { // 1ere ligne
		parentLi = upInTree(li);
		if (parentLi) {
			x = parentLi;
		} else {
			x = lastResLi();
		}
	} else {
		x = prevli;
	}
	return x;
}