// Developed by Stuart Langridge, shared under the MIT license
// from http://www.kryogenix.org/code/browser/sorttable/
// Modified for SMW (in fact, we might rewrite the code since we
// usually have very special tables to sort)

addOnloadHook(smw_sortables_init);

var SORT_COLUMN_INDEX;
var SMW_PATH;

function smw_sortables_init() {
	// The following is a hack to find out the path to our skin directory
	// I am happy to change this into anything else if there is another way ...
// 	if (!document.getElementById) return;
// 	st = document.getElementById("SMW_sorttable_script_inclusion");
// 	SMW_PATH = st.src.substring(0, st.src.length-17);
	SMW_PATH = wgScriptPath + "/extensions/SemanticMediaWiki/skins";
	// Preload images
	smw_preload_images();
	// Now find the tables
	//if (!document.getElementsByTagName) return;
	//tbls = document.getElementsByTagName("SMW_headscript_sorttable");
    // Find all tables with class smwtable and make them sortable
    if (!document.getElementsByTagName) return;
    tbls = document.getElementsByTagName("table");
    for (ti=0;ti<tbls.length;ti++) {
        thisTbl = tbls[ti];
        if (((' '+thisTbl.className+' ').indexOf("smwtable") != -1) && (thisTbl.id)) {
            //initTable(thisTbl.id);
            smw_makeSortable(thisTbl);
        }
    }
}

function smw_preload_images() {
    // preload icons needed by SMW
    if (document.images) {
	pic1= new Image(12,14);
	pic1.src = SMW_PATH + "/images/sort_up.gif";
	pic2= new Image(12,14);
	pic2.src = SMW_PATH + "/images/sort_down.gif";
	pic3= new Image(16,16); 
	pic3.src = SMW_PATH + "/images/search_icon.png"; // TODO: move this preload to somewhere else?
    }
}

function smw_makeSortable(table) {
    if (table.rows && table.rows.length > 0) {
        var firstRow = table.rows[0];
    }
    if (!firstRow) return;
    if ( (firstRow.cells.length==0)||(firstRow.cells[0].tagName.toLowerCase() != 'th') ) return;

    // We have a first row that is a header; make its contents clickable links:
    for (var i=0;i<firstRow.cells.length;i++) {
        var cell = firstRow.cells[i];
        //var txt = smw_getInnerText(cell); // unused -- we preserve the inner html
        cell.innerHTML = '<a href="#" class="sortheader" '+
        'onclick="smw_resortTable(this, '+i+');return false;">' +
        '<span class="sortarrow"><img alt="[&lt;&gt;]" src="' + SMW_PATH + '/images/sort_none.gif"/></span></a>&nbsp;<span style="margin-left: 0.3em; margin-right: 1em;">' + cell.innerHTML + '</span>'; // the &nbsp; is for Opera ...
    }

    /*make sortkeys invisible
     *for now done in css
     *this code provides the possibility to do it via js, so that non js clients
     *can see the keys
     */
//    for(var ti=0; ti<table.rows.length; ti++){
// 	for (var tj=0; tj<table.rows[ti].cells.length; tj++){
// 	    var spans=table.rows[ti].cells[tj].getElementsByTagName("span");
// 	    if(spans.length > 0){
// 		for (var tk=0;tk<spans.length;tk++) {
// 		    if(spans[tk].className=="smwsortkey"){
// 			spans[tk].style.display="none";
// 		    }
// 		}
// 	    }
// 	}
//    }
}

function smw_getInnerText(el){
    var spans = el.getElementsByTagName("span");
    if(spans.length > 0){
	for (var i=0;i<spans.length;i++) {
	    if(spans[i].className=="smwsortkey") return spans[i].innerHTML;
	}
    }else{
	return el.innerHTML;	
    }

}

function smw_resortTable(lnk,clid) {
    // get the span
    var span;
    for (var ci=0;ci<lnk.childNodes.length;ci++) {
        if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'span') span = lnk.childNodes[ci];
    }
    var spantext = smw_getInnerText(span);//is this variable unused
    var td = lnk.parentNode;
    var column = clid || td.cellIndex;
    var table = smw_getParent(td,'TABLE');


    if (table.rows.length <= 1) return;

    sortfn = smw_sort_caseinsensitive; //sorting w/o keys
    //check for sorting keys and change sorting function
    var itm = table.rows[1].cells[column];
    var spans = itm.getElementsByTagName("span");
    if(spans.length > 0){
	for (var i=0;i<spans.length;i++) {
	    if(spans[i].className=="smwsortkey") sortfn=smw_sort_numeric; //sorting with keys
	}
    }


    SORT_COLUMN_INDEX = column;
    var firstRow = new Array();
    var newRows = new Array();
    var footers = new Array();
    for (i=0;i<table.rows[0].length;i++) { firstRow[i] = table.rows[0][i]; }
    // class "sortbottom" makes rows sort below all others, but they are still sorted
    // class "smwfooter" excludes rows from sorting and appends them below in unchanged order
    for (j=1;j<table.rows.length;j++) {
       if ((!table.rows[j].className || table.rows[j].className.indexOf('smwfooter') == -1)) { newRows.push(table.rows[j]); } else { footers.push(table.rows[j]); }
    }

    newRows.sort(sortfn);

    var ARROW;
    if (span.getAttribute("sortdir") == 'down') {
        ARROW = '<img alt="[&gt;]" src="' + SMW_PATH + '/images/sort_up.gif"/>';
        newRows.reverse();
        span.setAttribute('sortdir','up');
    } else {
        ARROW = '<img alt="[&lt;]" src="' + SMW_PATH + '/images/sort_down.gif"/>';
        span.setAttribute('sortdir','down');
    }

    // We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
    // don't do sortbottom rows
    for (i=0;i<newRows.length;i++) { if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf('sortbottom') == -1))) table.tBodies[0].appendChild(newRows[i]);}
    // do sortbottom rows only
    for (i=0;i<newRows.length;i++) { if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1)) table.tBodies[0].appendChild(newRows[i]);}
    for (i=0;i<footers.length;i++) { table.tBodies[0].appendChild(footers[i]);}

    // Delete any other arrows there may be showing
    var allspans = document.getElementsByTagName("span");
    for (var ci=0;ci<allspans.length;ci++) {
        if (allspans[ci].className == 'sortarrow') {
            if (smw_getParent(allspans[ci],"table") == smw_getParent(lnk,"table")) { // in the same table as us?
                allspans[ci].innerHTML = '<img alt="[&lt;&gt;]" src="' + SMW_PATH + '/images/sort_none.gif"/>';
            }
        }
    }

    span.innerHTML = ARROW;
}

function smw_getParent(el, pTagName) {
    if (el == null) return null;
    else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())	// Gecko bug, supposed to be uppercase
	return el;
    else
	return smw_getParent(el.parentNode, pTagName);
}

function smw_sort_caseinsensitive(a,b) {
    aa = smw_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
    bb = smw_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();
    if (aa==bb) return 0;
    if (aa<bb) return -1;
    return 1;
}


function smw_sort_numeric(a,b) {
    aa = parseFloat(smw_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    if (isNaN(aa)) aa = 0;
    bb = parseFloat(smw_getInnerText(b.cells[SORT_COLUMN_INDEX]));
    if (isNaN(bb)) bb = 0;
    return aa-bb;
}


function smw_sort_default(a,b) {
    aa = smw_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = smw_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa==bb) return 0;
    if (aa<bb) return -1;
    return 1;
}


function addEvent(elm, evType, fn, useCapture){
// addEvent and removeEvent
// cross-browser event handling for IE5+,  NS6 and Mozilla
// By Scott Andrew

    if (elm.addEventListener){
	elm.addEventListener(evType, fn, useCapture);
	return true;
    } else if (elm.attachEvent){
	var r = elm.attachEvent("on"+evType, fn);
	return r;
    } else {
	alert("Handler could not be removed");
    }
}