/**
 *	Javascript functions for Search-Suggest-Feature
 */

function ajaxac_createXMLHttp()
{
    var ret = null;
    try {
        ret = new ActiveXObject('Msxml2.XMLHTTP');
    }
    catch (e) {
        try {
            ret = new ActiveXObject('Microsoft.XMLHTTP');
        }
        catch (ee) {
            ret = null;
        }
    }
    if (!ret && typeof XMLHttpRequest != 'undefined')
        ret = new XMLHttpRequest();

    return ret;
}

function ajaxac_attachWidget(hook, id)
{
    if (hook.length > 0 && id.length > 0) {
        evalStr = hook + " = document.getElementById('" + id + "');";
        eval(evalStr);
    }
}

function ajaxac_receivejsarray(code)
{
	var ret = null;
	if (trim(code) == '') { 
		ret = [] ;
	} else {
		eval('var ret = ' + code);
	}
    return ret;
}

function ajaxac_countdowntimer(cmd, ms)
{
    this.cmd = cmd;
    this.ms = ms;
    this.tp = 0;
}

ajaxac_countdowntimer.prototype.start = function()
{
    if (this.tp > 0)
        this.reset();
    this.tp = window.setTimeout(this.cmd, this.ms);
}

ajaxac_countdowntimer.prototype.reset = function()
{
    if (this.tp > 0)
        window.clearTimeout(this.tp);
    this.tp = 0;
}

function trim(str)
{
    return str.replace(/^(\s+)?(\S*)(\s+)?$/, '$2');
}

function ltrim(str)
{
    return str.replace(/^\s*/, '');
}

function rtrim(str)
{
    return str.replace(/\s*$/, '');
}

function delay(milliseconds)
{
    var then, now;
    then = new Date().getTime();
    now = then;
    while ((now - then) < milliseconds) {
        now = new Date().getTime();
    }
}

function ajaxac_getkeycode(e)
{
    if (document.layers)
        return e.which;
    else if (document.all)
        return event.keyCode;
    else if (document.getElementById)
        return e.keyCode;
    return 0;
}

// ------------------------------------------------------------------------------

var gsc_basicmatch = /[a-z0-9]/i;

function gsc_getquery(elt, q)
{
    q = ltrim(q);
    q = q.replace('\s+', ' ');
    if (q.length == 0 || !gsc_basicmatch.test(q)) {
        gsc_emptyresults(elt);
        return '';
    }

    if (elt.currentQuery && (elt.currentQuery == q || elt.tempQuery == q))
        return '';

    elt.currentQuery = q;
    return q;
}

function gsc_hide(elt)
{
    if (elt) elt.style.display = 'none';
    
    var st = document.getElementById("searchText");
    if (st) st.style.display = '';

}

function gsc_ishidden(elt)
{
    return elt.style.display == 'none';
}

function gsc_show(elt)
{
    if (elt) elt.style.display = 'block';
    
    var st = document.getElementById("searchText");
     if (st) st.style.display = 'none';
}

function gsc_emptyresults(elt)
{
    if (!elt) return;

    elt.innerHTML = '';
    elt.numResults = 0;
    elt.selectedIndex = 0;
    elt.results = [];
    gsc_hide(elt);
}

//gsc_addresult(__results, __query, _data[i][0], _data[i][1], i == 0); 
// __results, __query, "KEYWORD", "100-COUNT", selected)
function gsc_addresult(elt, qElt, q, c, sel)
{
    if (!elt) return;

    if (sel) elt.selectedIndex = elt.numResults;
	
    idx = elt.numResults;
    elt.results[elt.numResults++] = q;

    var _res = '';
    _res += '<div class="' + (sel ? 'srs' : 'sr') + '"'
         +  ' onmouseover="gsc_mouseover(\'' + elt.id + '\', \'' + qElt.id + '\', ' + idx + ')"'
         +  ' onmouseout="gsc_mouseout(\'' + elt.id + '\', ' + idx + ')"'
         +  ' onclick="gsc_mouseclick(\'' + elt.id + '\', \'' + qElt.id + '\', ' + idx + ')">';
    _res += '<span class="srt">' + q + '</span>';
    if (c.length > 0)
        _res += '<span class="src">' + c + '</span>';
    _res += '</div>';

    elt.innerHTML += _res;
}

function gsc_mouseover(id, qId, idx)
{
    elt = document.getElementById(id);
    elt.selectedIndex = idx;
    qElt = document.getElementById(qId);
    qElt.focus();

    gsc_highlightsel(elt);
}

function gsc_mouseout(id, idx)
{
    elt = document.getElementById(id);
    elt.selectedIndex = -1;

    gsc_highlightsel(elt);
}

function gsc_mouseclick(id, qId, idx)
{
    elt = document.getElementById(id);
    qElt = document.getElementById(qId);

    qElt.value = elt.results[idx];
    qElt.form.submit();
}

function gsc_handleup(elt, qElt)
{
    if (elt.numResults > 0 && gsc_ishidden(elt)) {
        gsc_show(elt);
        return;
    }

    if (elt.selectedIndex == 0)
        return;
    else if (elt.selectedIndex < 0)
        elt.selectedIndex = elt.numResults - 1;
    else
        elt.selectedIndex--;
    gsc_highlightsel(elt, qElt);
}

function gsc_handledown(elt, qElt)
{
    if (elt.numResults > 0 && gsc_ishidden(elt)) {
        gsc_show(elt);
        return;
    }

    if (elt.selectedIndex == elt.numResults - 1)
        return;
    else if (elt.selectedIndex < 0)
        elt.selectedIndex = 0;
    else
        elt.selectedIndex++;
    gsc_highlightsel(elt, qElt);
}

function gsc_highlightsel(elt, qElt)
{
    divs = elt.getElementsByTagName('div');

    for (i = 0; i < divs.length; i++) {
        if (i == elt.selectedIndex) {
            divs[i].className = 'srs';
            elt.tempQuery = elt.results[i];

            if (qElt) {
                qElt.value = elt.results[i];
				// IE
                if (qElt.createTextRange) {
                    r = qElt.createTextRange();
                    r.moveStart('character', elt.currentQuery.length);
                    r.moveEnd('character', qElt.value.length);
                    r.select();
                }
				//Mozilla
				if (qElt.setSelectionRange) {
					qElt.setSelectionRange(elt.currentQuery.length,qElt.value.length);
				}
            }
        }
        else
            divs[i].className = 'sr';
    }
}

// -------------------------------------
//  INIT OBJECTS 
// -------------------------------------
ajaxac_attachWidget('__query', 'searchfield');
ajaxac_attachWidget('__results', 'search-results');

document.onclick = function(e) {
	gsc_hide(__results); //hide search-results on every click
} 

__query.onkeydown = function(e)
                            {
                                key = ajaxac_getkeycode(e);
                                switch (key) {
                                    case 27: // escape
                                        gsc_hide(__results);
                                        return false;
                                        break;
									case 13: // return
                                        gsc_hide(__results);
						    			__gsctimer.reset();
										if (trim(__query.value) == '') return false; //catch empty string
                                        return true;
                                        break;
                                    case 38: // up arrow
                                        gsc_handleup(__results, __query);
                                        return false;
                                        break;
                                    case 40: // down arrow
                                        gsc_handledown(__results, __query);
                                        return false;
                                        break;
                                    default:
										//window.status = __query.value.length + "=" + __query.value + "|" + key;
                                        __gsctimer.start();
                                }
                                return true;
                            }
__results.onload = function() { gsc_emptyresults(this); }

__results.onload();
__gsctimer = new ajaxac_countdowntimer('__gsctimer.ontimerexpire()', 350);
__gsctimer.ontimerexpire = function()
                            {
                                //check if the search string's length is >=2
								if (trim(__query.value).length <= 1) {
									gsc_hide(__results);
									__gsctimer.reset();
									return false;
								}
								
								_q = gsc_getquery(__results, __query.value);
                                if (trim(_q).length == 0) return false;
                                try {
                                    __gscfetch = ajaxac_createXMLHttp();
                                    __gscfetch.open('GET', '/system/suggest.jsp' + '?' + 'query=' + encodeURIComponent(encodeURIComponent(_q)));

									__gscfetch_xmlhttpsuccess = function()
		                            {
		                                _data = ajaxac_receivejsarray(__gscfetch.responseText);
		                                gsc_emptyresults(__results);
										var tmp = "";
		                                if (_data.length > 0) {
		                                    for (i = 0; i < _data.length; i++) {
		                                        gsc_addresult(__results, __query, _data[i][0], _data[i][1], i == 0);
												tmp += _data[i][0] + ","; 
		                                    }
		                                    gsc_show(__results);
											
											//check if first result begins with search keyword
											if (_data[0][0].indexOf(__query.value) == 0) {
												gsc_highlightsel(__results, __query);
											}
		                                }
		                            }

									__gscfetch_onreadystatechange = function()
		                            {
		                                //window.status = __gscfetch.status + " | " + __gscfetch.readyState;
		                                if (__gscfetch.readyState == 4 && (__gscfetch.status == 200 || __gscfetch.status == 0) && __gscfetch_xmlhttpsuccess) {
		                                    __gscfetch_xmlhttpsuccess();
		                                }
		                            }

									__gscfetch.onreadystatechange = __gscfetch_onreadystatechange;

									__gscfetch.send(null);
	                                }
	                                catch (e) { }
	
	
	                                return false;
	                            }