/**
*
*  Sortable HTML table
*  http://www.webtoolkit.info/
*
**/

function SortableTable (tableEl) {

    this.tbody = tableEl.getElementsByTagName('tbody');
    this.thead = tableEl.getElementsByTagName('thead');
    this.tfoot = tableEl.getElementsByTagName('tfoot');

    this.getInnerText = function (el) {
        if (typeof(el.textContent) != 'undefined') return el.textContent;
        if (typeof(el.innerText) != 'undefined') return el.innerText;
        if (typeof(el.innerHTML) == 'string') return el.innerHTML.replace(/<[^<>]+>/g,'');
    }

    this.getParent = function (el, pTagName) {
        if (el == null) return null;
        else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())
            return el;
        else
            return this.getParent(el.parentNode, pTagName);
    }

    this.sort = function (cell) {

        var column = cell.cellIndex;
        var itm = this.getInnerText(this.tbody[0].rows[1].cells[column]);
        var sortfn = this.sortCaseInsensitive;

        if (itm.match(/\d\d[-]+\d\d[-]+\d\d\d\d/)) sortfn = this.sortDate; // date format mm-dd-yyyy
        if (itm.replace(/^\s+|\s+$/g,"").match(/^[\d\.]+$/)) sortfn = this.sortNumeric;

        this.sortColumnIndex = column;

        var newRows = new Array();
        for (j = 0; j < this.tbody[0].rows.length; j++) {
            newRows[j] = this.tbody[0].rows[j];
        }

        newRows.sort(sortfn);

        if (cell.getAttribute("sortdir") == 'down') {
            newRows.reverse();
            cell.setAttribute('sortdir','up');
        } else {
            cell.setAttribute('sortdir','down');
        }

        for (i=0;i<newRows.length;i++) {
            this.tbody[0].appendChild(newRows[i]);
        }

    }

    this.sortCaseInsensitive = function(a,b) {
        aa = thisObject.getInnerText(a.cells[thisObject.sortColumnIndex]).toLowerCase();
        bb = thisObject.getInnerText(b.cells[thisObject.sortColumnIndex]).toLowerCase();
        if (aa==bb) return 0;
        if (aa<bb) return -1;
        return 1;
    }

    this.sortDate = function(a,b) {
        aa = thisObject.getInnerText(a.cells[thisObject.sortColumnIndex]);
        bb = thisObject.getInnerText(b.cells[thisObject.sortColumnIndex]);
        date1 = aa.substr(6,4)+aa.substr(3,2)+aa.substr(0,2);
        date2 = bb.substr(6,4)+bb.substr(3,2)+bb.substr(0,2);
        if (date1==date2) return 0;
        if (date1<date2) return -1;
        return 1;
    }

    this.sortNumeric = function(a,b) {
        aa = parseFloat(thisObject.getInnerText(a.cells[thisObject.sortColumnIndex]));
        if (isNaN(aa)) aa = 0;
        bb = parseFloat(thisObject.getInnerText(b.cells[thisObject.sortColumnIndex]));
        if (isNaN(bb)) bb = 0;
        return aa-bb;
    }

    // define variables
    var thisObject = this;
    var sortSection = this.thead;

    // constructor actions
    if (!(this.tbody && this.tbody[0].rows && this.tbody[0].rows.length > 0)) return;

    if (sortSection && sortSection[0].rows && sortSection[0].rows.length > 0) {
        var sortRow = sortSection[0].rows[0];
    } else {
        return;
    }

    for (var i=0; i<sortRow.cells.length; i++) {
        sortRow.cells[i].sTable = this;
        sortRow.cells[i].onclick = function () {
            this.sTable.sort(this);
            return false;
        }
    }

}