/*
  SortTable
  version 2
  7th April 2007
  Stuart Langridge, http://www.kryogenix.org/code/browser/sorttable/
  Licenced as X11: http://www.kryogenix.org/code/browser/licence.html

*/

 
var stIsIE = /*@cc_on!@*/false;

var upArrowSymbol = "<img style='position:relative; top:2px; padding-left:2px;'  src='/images/core/sortUp.gif'>";
var downArrowSymbol = "<img  style='position:relative; top:2px; padding-left:2px;'  src='/images/core/sortDown.gif'>";

var columnToReverse = -1; 
var columnToReverseType = "";

sorttable = {
  init: function() {
    // quit if this function has already been called
    if (arguments.callee.done) return;
    // flag this function so we don't do the same thing twice
    arguments.callee.done = true;
    // kill the timer
    if (_timer) clearInterval(_timer);
    
    if (!document.createElement || !document.getElementsByTagName) return;
    
    sorttable.DATE_RE = /^(\d\d?)[\/\.-](\d\d?)[\/\.-]((\d\d)?\d\d)$/;
    
    forEach(document.getElementsByTagName('table'), function(table) {
      if (table.className.search(/\bsortable\b/) != -1) {
        sorttable.makeSortable(table);
      }
    });
    
  },
  
  makeSortable: function(table) {
    if (table.getElementsByTagName('thead').length == 0) {
      // table doesn't have a tHead. Since it should have, create one and
      // put the first table row in it.
      the = document.createElement('thead');
      the.appendChild(table.rows[0]);
      table.insertBefore(the,table.firstChild);
    }
    // Safari doesn't support table.tHead, sigh
    if (table.tHead == null) table.tHead = table.getElementsByTagName('thead')[0];
    
    if (table.tHead.rows.length != 1) return; // can't cope with two header rows
    
    sortbottomrows = [];
    for (var i=0; i<table.rows.length; i++) {
      if (table.rows[i].className.search(/\bsortbottom\b/) != -1) {
        sortbottomrows[sortbottomrows.length] = table.rows[i];
      }
    }
    if (sortbottomrows) {

      for (var i=0; i<sortbottomrows.length; i++) {
        tfo.appendChild(sortbottomrows[i]);
      }
      delete sortbottomrows;
    }
    
    // work through each column and calculate its type
    headrow = table.tHead.rows[0].cells;
    for (var i=0; i<headrow.length; i++) {
      // manually override the type with a sorttable_type attribute
      if (!headrow[i].className.match(/\bsorttable_nosort\b/)) { // skip this col
        mtch = headrow[i].className.match(/\bsorttable_([a-z0-9]+)\b/);
        if (mtch) { override = mtch[1]; }
	      if (mtch && typeof sorttable["sort_"+override] == 'function') {
	        headrow[i].sorttable_sortfunction = sorttable["sort_"+override];
	      } else {


	        //headrow[i].sorttable_sortfunction = sorttable.sort_ddmm;
	         headrow[i].sorttable_sortfunction = sorttable.guessType(table,i);
	      }


	      // make it clickable to sort
	      headrow[i].sorttable_columnindex = i;
	      headrow[i].sorttable_tbody = table.tBodies[0];
	      dean_addEvent(headrow[i],"click", function(e) {

		 ////////////////////////////////////////////////////////////////

          if (this.className.search(/\bsorttable_sorted\b/) != -1) {
            // if we're already sorted by this column, just 
            // reverse the table, which is quicker

			//alert('reversing!');

            sorttable.reverse(this.sorttable_tbody);
            this.className = this.className.replace('sorttable_sorted',
                                                    'sorttable_sorted_reverse');

			//this.removeChild(document.getElementById('sorttable_sortfwdind'));    
          sortfwdind = document.getElementById('sorttable_sortfwdind');
          if (sortfwdind) { sortfwdind.parentNode.removeChild(sortfwdind); }
          sortrevind = document.getElementById('sorttable_sortrevind');
          if (sortrevind) { sortrevind.parentNode.removeChild(sortrevind); }			

            sortrevind = document.createElement('span');
            sortrevind.id = "sorttable_sortrevind";
            //sortrevind.innerHTML = stIsIE ? '&nbsp<font face="webdings">5</font>' : '&nbsp;&#x25B4;';
            sortrevind.innerHTML = upArrowSymbol;
            this.appendChild(sortrevind);
            return;
          }

          if (this.className.search(/\bsorttable_sorted_reverse\b/) != -1) {
            // if we're already sorted by this column in reverse, just 
            // re-reverse the table, which is quicker
			//alert('Re-reversing!');

            sorttable.reverse(this.sorttable_tbody);
            this.className = this.className.replace('sorttable_sorted_reverse',
                                                    'sorttable_sorted');

			//this.removeChild(document.getElementById('sorttable_sortfwdind'));
			  sortfwdind = document.getElementById('sorttable_sortfwdind');
			  if (sortfwdind) { sortfwdind.parentNode.removeChild(sortfwdind); }
			  sortrevind = document.getElementById('sorttable_sortrevind');
			  if (sortrevind) { sortrevind.parentNode.removeChild(sortrevind); }

            sortfwdind = document.createElement('span');
            sortfwdind.id = "sorttable_sortfwdind";
            //sortfwdind.innerHTML = stIsIE ? '&nbsp<font face="webdings">6</font>' : '&nbsp;&#x25BE;';
            sortfwdind.innerHTML = downArrowSymbol;
            this.appendChild(sortfwdind);
            return;
          }

          
          // remove sorttable_sorted classes
          theadrow = this.parentNode;
          forEach(theadrow.childNodes, function(cell) {
            if (cell.nodeType == 1) { // an element
              cell.className = cell.className.replace('sorttable_sorted_reverse','');
              cell.className = cell.className.replace('sorttable_sorted','');
            }
          });

          sortfwdind = document.getElementById('sorttable_sortfwdind');
          if (sortfwdind) { sortfwdind.parentNode.removeChild(sortfwdind); }
          sortrevind = document.getElementById('sorttable_sortrevind');
          if (sortrevind) { sortrevind.parentNode.removeChild(sortrevind); }

          //alert('sorting for the first time!');

          this.className += ' sorttable_sorted';
          sortfwdind = document.createElement('span');
          sortfwdind.id = "sorttable_sortfwdind";
		  //sortfwdind.innerHTML = stIsIE ? '&nbsp<font face="webdings">6</font>' : '&nbsp;&#x25BE;';
		  sortfwdind.innerHTML = downArrowSymbol;
          this.appendChild(sortfwdind);

	        row_array = [];
	        col = this.sorttable_columnindex;
			//place column index into a global variable to use later
			columnToReverse = col;
			//////////////////////
	        rows = this.sorttable_tbody.rows;			

	        for (var j=0; j<rows.length; j++) 
			{
			  var sortText = sorttable.getInnerText(rows[j].cells[col]);
	          row_array[row_array.length] = [sortText, rows[j]];
	        }

	        /* If you want a stable sort, uncomment the following line */
	        //sorttable.shaker_sort(row_array, this.sorttable_sortfunction);

	        /* and comment out this one */
			//alert(this.sorttable_sortfunction.name);
			
	        row_array.sort(this.sorttable_sortfunction);
	        
	        tb = this.sorttable_tbody;
	        for (var j=0; j<row_array.length; j++) {
	          tb.appendChild(row_array[j][1]);
	        }
	        
	        delete row_array;
	      });
	    }
    }
  },
  
  guessType: function(table, column) {

	//if the heading contains the word "date" sort by date
    var columnHeading = table.tHead.rows[0].cells[column].innerHTML.toLowerCase();
	if(columnHeading.indexOf("date") > -1) 
	  {  return sorttable.sort_ddmm; }

    //otherwise guess the type of a column based on its first non-blank row
    sortfn = sorttable.sort_alpha;
    for (var i=0; i<table.tBodies[0].rows.length; i++) 
	{

	  text = sorttable.getInnerText(table.tBodies[0].rows[i].cells[column]);

	  
	  //if(valueIsDate(getFirstWord(text)) || isYear(getFirstWord(text)))
	  //{ return sorttable.sort_ddmm; }

      if (text != '') {
        if (text.match(/^-?[£$¤]?[\d,.]+%?$/)) {
          return sorttable.sort_numeric;
        }
      }
    }
    return sortfn;
  },
  
  getInnerText: function(node) {
    // gets the text we want to use for sorting for a cell.    
    hasInputs = (typeof node.getElementsByTagName == 'function') &&
                 node.getElementsByTagName('input').length;
    
    if (node.getAttribute("sorttable_customkey") != null) {
      return node.getAttribute("sorttable_customkey");
    }
	else if (typeof node.innerHTML != 'undefined' && !hasInputs)
	{
		 return innerTextReplace(node.innerHTML);
	}
    else if (typeof node.textContent != 'undefined' && !hasInputs) {
      //return node.textContent.replace(/^\s+|\s+$/g, '');
      return innerTextReplace(node.textContent);
    }
    else if (typeof node.innerText != 'undefined' && !hasInputs) {
      //return node.innerText.replace(/^\s+|\s+$/g, '');
      return innerTextReplace(node.innerText);
    }
    else if (typeof node.text != 'undefined' && !hasInputs) {
      //return node.text.replace(/^\s+|\s+$/g, '');
      return innerTextReplace(node.text);
    }
    else {
      switch (node.nodeType) {
        case 3:
          if (node.nodeName.toLowerCase() == 'input') {
            //return node.value.replace(/^\s+|\s+$/g, '');
            return innerTextReplace(node.value);
          }
        case 4:
          //return node.nodeValue.replace(/^\s+|\s+$/g, '');
          return innerTextReplace(node.nodeValue);
          break;
        case 1:
        case 11:
          var innerText = '';
          for (var i = 0; i < node.childNodes.length; i++) {
            innerText += sorttable.getInnerText(node.childNodes[i]);
          }
          //return innerText.replace(/^\s+|\s+$/g, '');
          return innerTextReplace(innerText);
          break;
        default:
          return '';
      }
    }
  },
  
  reverse: function(tbody) {
	//alert(columnToReverse + " - " + columnToReverseType);


	//travel down the current column to get to the first blank row
	var firstBlankRow = -1;
    for (var i=0; i<tbody.rows.length; i++) 
	{
		var cellContent = tbody.rows[i].cells[columnToReverse].innerHTML;

		var isBlank = (cellContent=="");
		//for date columns, free text is considered a "blank" and will go after the dates
		if(columnToReverseType == "date") 
	    { isBlank = !startsWithDateOrYear(cellContent); 
		  //alert(cellContent + " - " + isBlank);
		}

		if(firstBlankRow == -1 && isBlank) firstBlankRow = i;
	}

	//alert("firstBlankRow=" + firstBlankRow);

	

	// build array of the non-blank rows
	var LastNonBlankRow = tbody.rows.length - 1;
	if(firstBlankRow > -1) LastNonBlankRow = firstBlankRow - 1;
    newrows = [];
    for (var i=0; i <= LastNonBlankRow; i++) {
      newrows[newrows.length] = tbody.rows[i];
    }

	//build array of the blank rows
	blankrows = [];
	if(firstBlankRow > -1)
	  {
		for (var i=firstBlankRow; i < tbody.rows.length; i++)
		{
		  blankrows[blankrows.length] = tbody.rows[i];
		}
	  }

	//append the non-blank rows in reverse order
    for (var i=newrows.length-1; i>=0; i--) {
       tbody.appendChild(newrows[i]);
    }

	//alert(blankrows.length);
	//append the blank rows in the same order, below the reversed ones
    for (var i=0; i < blankrows.length; i++) {
       tbody.appendChild(blankrows[i]);
    }
	
	//remove the original rows
    delete newrows;
    delete blankrows;

	

  },
  
  /* sort functions
     each sort function takes two parameters, a and b
     you are comparing a[0] and b[0] */
  sort_numeric: function(a,b) {

	columnToReverseType = "number";

    aa = parseFloat(a[0].replace(/[^0-9.-]/g,''));
    bb = parseFloat(b[0].replace(/[^0-9.-]/g,'')); 
	
	//put blanks before anything else
	/* 
	if( isNaN(aa) && isNaN(bb)) return 0;
	if( isNaN(aa) && !isNaN(bb)) return -1;
	if( !isNaN(aa) && isNaN(bb)) return 1;
	*/

	//put blanks AFTER anything else
	if( isNaN(aa) && isNaN(bb)) return 0;
	if( isNaN(aa) && !isNaN(bb)) return 1;
	if( !isNaN(aa) && isNaN(bb)) return -1;

    return aa-bb;
  },


  sort_alpha: function(a,b) {

	columnToReverseType = "alpha";

	//put blanks AFTER anything else
	if(a[0]=="" && b[0]=="") return 0;
	if(a[0]=="" && b[0]!="") return 1;
	if(a[0]!="" && b[0]=="") return -1;

    if (a[0]==b[0]) return 0;
    if (a[0]<b[0]) return -1;
    return 1;
  },

  sort_ddmm: function(a,b) {

	columnToReverseType = "date";

	dt1 = dateSortValue(a[0]);
	dt2 = dateSortValue(b[0]);

	//alert(dt1 + " - " + dt2);

    if (dt1==dt2) return 0;
    if (dt1<dt2) return -1;
    return 1;
  },

  sort_mmdd: function(a,b) {
  }
}  

/****************************/
function dateSortValue(inputString)
{
   //place blank text at the very end
  if(trim(inputString)=="") return "99999999";

  var fw = getFirstWord(inputString);

  //return date in yyyymmdd format,
  //treating text that starts with a date as if it was a date
  if(valueIsDate(fw))
  { 
	  return dateToYYYMMDD(fw); 
   } 
  
  //if the value is just a year (or starts with just a year)
  //sort as if it was BEFORE the 1st of January for that year
  if(isYear(fw))
  {  return fw + "0000"; }

  //place free text after dates, but before blank text
  if(inputString != "") return "88888888" + inputString


}


function dateToYYYMMDD(inputDate)
{
		mtch = inputDate.match(sorttable.DATE_RE);
		y = mtch[3]; m = mtch[2]; d = mtch[1];
		if (m.length == 1) m = '0'+m;
		if (d.length == 1) d = '0'+d;
		return y+m+d;
}

function valueIsDate(inputString)
{
	return (inputString.match(sorttable.DATE_RE) != null);
}

function startsWithDateOrYear(inputString)
{
  return valueIsDate(getFirstWord(inputString)) || isYear(getFirstWord(inputString));
}

function isYear(inputString)
{
  if(inputString.length != 4) return false;
  for(xx=0; xx<4; xx++)
	{ 
	   cc = inputString.substring(xx,xx+1)
	   if(!(cc >= "0" && cc <= "9")) return false;
	}
  return true;
}



function getFirstWord(inputString)
{

	//position of first linefeed
	var firstLineFeedPos = inputString.toLowerCase().indexOf("<br>");

	//position of first space
	var firstSpacePos = inputString.indexOf(" ");
	//neither present - return the whole string
	if(firstLineFeedPos == -1 && firstSpacePos == -1) return inputString;
	//only a space present
	if(firstLineFeedPos == -1) return inputString.substring(0, firstSpacePos);
	//only a linefeed present
	if(firstSpacePos == -1) return inputString.substring(0, firstLineFeedPos);
	//linefeed comes first
	if(firstLineFeedPos < firstSpacePos) return inputString.substring(0, firstLineFeedPos);
	//space comes first
	 return inputString.substring(0, firstSpacePos);
}

function innerTextReplace(innerText)
{
	//return innerText.replace(/^\s+|\s+$/g, '');
	return trim(innerText.toLowerCase());
}



 function trim(x) {
 // skip leading and trailing whitespace
 // and return everything in between
  while(x.substring(0,1)==" ")
  {    x = x.substring(1,x.length);   }
  while(x.substring(x.length - 1, x.length)==" ")
  {	 x = x.substring(0, x.length - 1);  }
  return x;
  }


/* ******************************************************************
   Supporting functions: bundled here to avoid depending on a library
   ****************************************************************** */

// Dean Edwards/Matthias Miller/John Resig

/* for Mozilla/Opera9 */
if (document.addEventListener) {
    document.addEventListener("DOMContentLoaded", sorttable.init, false);
}

/* for Internet Explorer */
/*@cc_on @*/
/*@if (@_win32)
    document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
    var script = document.getElementById("__ie_onload");
    script.onreadystatechange = function() {
        if (this.readyState == "complete") {
            sorttable.init(); // call the onload handler
        }
    };
/*@end @*/

/* for Safari */
if (/WebKit/i.test(navigator.userAgent)) { // sniff
    var _timer = setInterval(function() {
        if (/loaded|complete/.test(document.readyState)) {
            sorttable.init(); // call the onload handler
        }
    }, 10);
}

/* for other browsers */
window.onload = sorttable.init;

// written by Dean Edwards, 2005
// with input from Tino Zijdel, Matthias Miller, Diego Perini

// http://dean.edwards.name/weblog/2005/10/add-event/

function dean_addEvent(element, type, handler) {
	if (element.addEventListener) {
		element.addEventListener(type, handler, false);
	} else {
		// assign each event handler a unique ID
		if (!handler.$$guid) handler.$$guid = dean_addEvent.guid++;
		// create a hash table of event types for the element
		if (!element.events) element.events = {};
		// create a hash table of event handlers for each element/event pair
		var handlers = element.events[type];
		if (!handlers) {
			handlers = element.events[type] = {};
			// store the existing event handler (if there is one)
			if (element["on" + type]) {
				handlers[0] = element["on" + type];
			}
		}
		// store the event handler in the hash table
		handlers[handler.$$guid] = handler;
		// assign a global event handler to do all the work
		element["on" + type] = handleEvent;
	}
};
// a counter used to create unique IDs
dean_addEvent.guid = 1;

function removeEvent(element, type, handler) {
	if (element.removeEventListener) {
		element.removeEventListener(type, handler, false);
	} else {
		// delete the event handler from the hash table
		if (element.events && element.events[type]) {
			delete element.events[type][handler.$$guid];
		}
	}
};

function handleEvent(event) {
	var returnValue = true;
	// grab the event object (IE uses a global event object)
	event = event || fixEvent(((this.ownerDocument || this.document || this).parentWindow || window).event);
	// get a reference to the hash table of event handlers
	var handlers = this.events[event.type];
	// execute each event handler
	for (var i in handlers) {
		this.$$handleEvent = handlers[i];
		if (this.$$handleEvent(event) === false) {
			returnValue = false;
		}
	}
	return returnValue;
};

function fixEvent(event) {
	// add W3C standard event methods
	event.preventDefault = fixEvent.preventDefault;
	event.stopPropagation = fixEvent.stopPropagation;
	return event;
};
fixEvent.preventDefault = function() {
	this.returnValue = false;
};
fixEvent.stopPropagation = function() {
  this.cancelBubble = true;
}

// Dean's forEach: http://dean.edwards.name/base/forEach.js
/*
	forEach, version 1.0
	Copyright 2006, Dean Edwards
	License: http://www.opensource.org/licenses/mit-license.php
*/

// array-like enumeration
if (!Array.forEach) { // mozilla already supports this
	Array.forEach = function(array, block, context) {
		for (var i = 0; i < array.length; i++) {
			block.call(context, array[i], i, array);
		}
	};
}

// generic enumeration
Function.prototype.forEach = function(object, block, context) {
	for (var key in object) {
		if (typeof this.prototype[key] == "undefined") {
			block.call(context, object[key], key, object);
		}
	}
};

// character enumeration
String.forEach = function(string, block, context) {
	Array.forEach(string.split(""), function(chr, index) {
		block.call(context, chr, index, string);
	});
};

// globally resolve forEach enumeration
var forEach = function(object, block, context) {
	if (object) {
		var resolve = Object; // default
		if (object instanceof Function) {
			// functions have a "length" property
			resolve = Function;
		} else if (object.forEach instanceof Function) {
			// the object implements a custom forEach method so use that
			object.forEach(block, context);
			return;
		} else if (typeof object == "string") {
			// the object is a string
			resolve = String;
		} else if (typeof object.length == "number") {
			// the object is array-like
			resolve = Array;
		}
		resolve.forEach(object, block, context);
	}
};