//////////////////////////////////////////////////////////////////////////////
// Code adapted from http://kryogenix.org/code/browser/sorttable/
//////////////////////////////////////////////////////////////////////////////

addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;

function sortables_init() {
    // Find all tables with class sortable 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("sortable") != -1) && (thisTbl.id)) {
            //initTable(thisTbl.id);
            ts_makeSortable(thisTbl);
        }
    }
}

function ts_makeSortable(table) {
    if (table.rows && table.rows.length > 0) {
        var firstRow = table.rows[0];
    }
    if (!firstRow) return;

    // We have a first row: assume it's the header, and make its contents clickable links
    for (var i = 0; i < firstRow.cells.length; i++) {
        var cell = firstRow.cells[i];
        var txt = ts_getInnerText(cell);
        cell.innerHTML = '<a href="#" class="sortheader" onclick="ts_resortTable(this);return false;">'
                + txt + '<span class="sortarrow"></span></a>';
    }
}

function ts_getInnerText(el) {
    if (typeof el == "string") return el;
    if (typeof el == "undefined") {
        return el
    }
    ;

    if (el.innerText) return el.innerText;    //Not needed but it is faster
    var str = "";

    var cs = el.childNodes;
    var l = cs.length;
    for (var i = 0; i < l; i++) {
        switch (cs[i].nodeType) {
            case 1: //ELEMENT_NODE
                str += ts_getInnerText(cs[i]);
                break;
            case 3:    //TEXT_NODE
                str += cs[i].nodeValue;
                break;
        }
    }
    return str;
}

function ts_resortTable(lnk) {
    // 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 = ts_getInnerText(span);
    var td = lnk.parentNode;
    var column = td.cellIndex;
    var table = getParent(td, 'TABLE');

    // Work out a type for the column
    if (table.rows.length <= 1) return;
    var itm = ts_getInnerText(table.rows[1].cells[column]);
    sortfn = guessSortFunction(itm);
    SORT_COLUMN_INDEX = column;
    var firstRow = new Array();
    var newRows = new Array();
    for (i = 0; i < table.rows[0].length; i++) {
        firstRow[i] = table.rows[0][i];
    }
    for (j = 1; j < table.rows.length; j++) {
        newRows[j - 1] = table.rows[j];
    }

    newRows.sort(sortfn);

    if (span.getAttribute("sortdir") == 'down') {
        ARROW = '&uarr;';
        newRows.reverse();
        span.setAttribute('sortdir', 'up');
    } else {
        ARROW = '&darr;';
        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]);
    }

    // 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 (getParent(allspans[ci], "table") == getParent(lnk, "table")) { // in the same table as us?
                allspans[ci].style.display = 'none';
                allspans[ci].innerHTML = '';
            }
        }
    }

    span.style.display = 'inline';
    span.innerHTML = ARROW;
}

function guessSortFunction(itm) {

    if (itm.match(/.*\d*\s(bytes|KB|GB).*/))       return ts_sort_filesize;
    if (itm.match(/.*\d+.*/) && (-1 == itm.indexOf("/"))) return ts_sort_numeric;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d\d\d$/)) return ts_sort_date;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d$/))     return  ts_sort_date;
    if (itm.match(/^[£$]/))                        return  ts_sort_currency;
    return ts_sort_caseinsensitive;
}


function 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 getParent(el.parentNode, pTagName);
}

function Trim(str)
{
    return str.replace(/^\s*|\s*$/g, "");
}

function ts_sort_date(a, b) {
    // y2k notes: two digit years less than 50 are treated as 20XX, greater than 50 are treated as 19XX
    aa = Trim(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    bb = Trim(ts_getInnerText(b.cells[SORT_COLUMN_INDEX]));
    if (aa.length == 10) {
        dt1 = aa.substr(6, 4) + aa.substr(3, 2) + aa.substr(0, 2);
    } else {
        yr = aa.substr(6, 2);
        if (parseInt(yr) < 50) {
            yr = '20' + yr;
        } else {
            yr = '19' + yr;
        }
        dt1 = yr + aa.substr(3, 2) + aa.substr(0, 2);
    }
    if (bb.length == 10) {
        dt2 = bb.substr(6, 4) + bb.substr(3, 2) + bb.substr(0, 2);
    } else {
        yr = bb.substr(6, 2);
        if (parseInt(yr) < 50) {
            yr = '20' + yr;
        } else {
            yr = '19' + yr;
        }
        dt2 = yr + bb.substr(3, 2) + bb.substr(0, 2);
    }
    if (dt1 == dt2) return 0;
    if (dt1 < dt2) return -1;
    return 1;
}

function ts_sort_currency(a, b) {
    aa = Trim(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g, ''));
    bb = Trim(ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g, ''));
    return parseFloat(aa) - parseFloat(bb);
}

function ts_sort_numeric(a, b) {
    aa = parseInt(Trim(ts_getInnerText(a.cells[SORT_COLUMN_INDEX])));
    if (isNaN(aa)) aa = 0;
    bb = parseInt(Trim(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])));
    if (isNaN(bb)) bb = 0;
    return aa - bb;
}

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


SIZEUNITS = new Object();
SIZEUNITS['GB'] = 80;
SIZEUNITS['KB'] = 60;
SIZEUNITS['bytes'] = 40;

function ts_sort_filesize(a, b) {

    aaSplit = Trim(ts_getInnerText(a.cells[SORT_COLUMN_INDEX])).split(" ");
    bbSplit = Trim(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])).split(" ");

    unit_a = aaSplit[1];
    unit_b = bbSplit[1];
    number_a = parseInt(aaSplit[0]);
    number_b = parseInt(bbSplit[0]);

    if (unit_a == unit_b) {
        if (isNaN(number_a)) number_a = 0;
        if (isNaN(number_b)) number_b = 0;
        return number_a - number_b;
    }

    aa = SIZEUNITS[unit_a];
    if (!aa) aa = 0;

    bb = SIZEUNITS[unit_b];
    if (!bb) bb = 0;

    return aa - bb;

}

function ts_sort_priority(a, b) {

    aa = Trim(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    bb = Trim(ts_getInnerText(b.cells[SORT_COLUMN_INDEX]));

    aa = PRIORITY_CODES[aa];
    if (!aa) aa = 0;

    bb = PRIORITY_CODES[bb];
    if (!bb) bb = 0;

    return aa - bb;

}


function ts_sort_status(a, b) {

    aa = Trim(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    bb = Trim(ts_getInnerText(b.cells[SORT_COLUMN_INDEX]));

    a_status = STATUS_CODES[aa];
    if (!a_status) a_status = 0;

    b_status = STATUS_CODES[bb];
    if (!b_status) b_status = 0;

    return a_status - b_status;

}


function ts_sort_default(a, b) {
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_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");
    }
}