/*
	Paginator 3000
	- idea by ecto (fhn.ru)
	- coded by karaboz (futurico.ru)
*/
function $(id){
	return document.getElementById(id);	
}
function addClass( objNode, strNewClass ) {
	replaceClass( objNode, strNewClass, '' );
}

function replaceClass( objNode, strNewClass, strCurrClass ) {
	var strOldClass = strNewClass;
	if ( strCurrClass && strCurrClass.length ){
		strCurrClass = strCurrClass.replace( /\s+(\S)/g, '|$1' );
		if ( strOldClass.length ) strOldClass += '|';
		strOldClass += strCurrClass;
	}
	objNode.className = objNode.className.replace( new RegExp('(^|\\s+)(' + strOldClass + ')($|\\s+)', 'g'), '$1' );
	objNode.className += ( (objNode.className.length)? ' ' : '' ) + strNewClass;
}

function matchClass( objNode, strCurrClass ) {
	return ( objNode && objNode.className.length && objNode.className.match( new RegExp('(^|\\s+)(' + strCurrClass + ')($|\\s+)') ) );
}

function getElementsByClassName(objParentNode, strNodeName, strClassName){
	var nodes = objParentNode.getElementsByTagName(strNodeName);
	if(!strClassName){
		return nodes;	
	}
	var nodesWithClassName = [];
	for(var i=0; i<nodes.length; i++){
		if(matchClass( nodes[i], strClassName )){
			//nodesWithClassName.push(nodes[i]);
			nodesWithClassName[nodesWithClassName.length] = nodes[i];
		}	
	}
	return nodesWithClassName;
}

function checkEvent(oEvt){
	oEvt=(oEvt) ? oEvt : ( (window.event) ? window.event : null );
	if(oEvt && oEvt.srcElement && !window.opera)
		oEvt.target=oEvt.srcElement;
	return oEvt;
}

function addEvent(objElement, strEventType, ptrEventFunc) {
	if (objElement.addEventListener)
		objElement.addEventListener(strEventType, ptrEventFunc, false);
	else if (objElement.attachEvent)
		objElement.attachEvent('on' + strEventType, ptrEventFunc);
}

function removeEvent(objElement, strEventType, ptrEventFunc) {
	if (objElement.removeEventListener) objElement.removeEventListener(strEventType, ptrEventFunc, false);
		else if (objElement.detachEvent) objElement.detachEvent('on' + strEventType, ptrEventFunc);
}

function getPageY( oElement ) {
	var iPosY = oElement.offsetTop;
	while ( oElement.offsetParent != null ) {
		oElement = oElement.offsetParent;
		iPosY += oElement.offsetTop;
		if (oElement.tagName == 'BODY') break;
	}
	return iPosY;
}

function getPageX( oElement ) {
	var iPosX = oElement.offsetLeft;
	while ( oElement.offsetParent != null ) {
		oElement = oElement.offsetParent;
		iPosX += oElement.offsetLeft;
		if (oElement.tagName == 'BODY') break;
	}
	return iPosX;
}

function getMousePosition(e) {
	if (e.pageX || e.pageY){
		var posX = e.pageX;
		var posY = e.pageY;
	}else if (e.clientX || e.clientY) 	{
		var posX = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
		var posY = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
	}
	return {x:posX, y:posY}	
}

function getElementsByClassNameFirstLevel(objParentNode, strNodeName, strClassName){
	var nodes = objParentNode.getElementsByTagName(strNodeName);

	if(!strClassName){
		nodesFirstLevel = [];
		for(var i=0; i<nodes.length; i++){
			if(nodes[i].parentNode.parentNode == objParentNode){
				nodesFirstLevel.push(nodes[i]);
			}	
		}
		return nodesFirstLevel;	
	}
	var nodesWithClassNameFirstLevel = [];
	for(var i=0; i<nodes.length; i++){
		if(matchClass(nodes[i], strClassName) && nodes[i].parentNode.parentNode == objParentNode){
			nodesWithClassNameFirstLevel.push(nodes[i]);
		}	
	}
	return nodesWithClassNameFirstLevel;
}

Paginator = function(id, pagesTotal, pagesSpan, currentPage, baseUrl){

	this.htmlBox = $(id);
	if(!this.htmlBox || !pagesTotal || !pagesSpan) return;

	this.pagesTable;
	this.pagesTr; 
	this.sliderTr;
	this.pagesCells;
	this.slider;
	
	this.pagesTotal = pagesTotal;
	if(pagesSpan < pagesTotal){
		this.pagesSpan = pagesSpan;
	} else {
		this.pagesSpan = pagesTotal;
		addClass(this.htmlBox, 'fullsize');
	}
	
	this.currentPage = currentPage;
	this.firstCellValue;

	if(baseUrl){
		this.baseUrl = baseUrl;
	} else {
		this.baseUrl = "/pages/";
	}

	this.initPages();
	this.initSlider();
	this.drawPages();
	this.initEvents();

	this.scrollToCurrentPage();
	this.setCurrentPagePoint();
} 

Paginator.prototype.initPages = function(){
	var html = "<table><tr>" 
	for (var i=1; i<=this.pagesSpan; i++){
		html += "<td></td>"
	}
	html += "</tr>" +
	"<tr><td colspan='" + this.pagesSpan + "'>" +
	"<div class='scrollbar'>" + 
		"<div class='line'></div>" + 
		"<div class='current_page_point'></div>" + 
		"<div class='slider'>" + 
			"<div class='slider_point'></div>" + 
		"</div>" + 
	"</div>" +
	"</td></tr></table>"
	this.htmlBox.innerHTML = html;

	this.pagesTable = this.htmlBox.getElementsByTagName('table')[0];
	this.pagesTr = this.pagesTable.getElementsByTagName('tr')[0]; 
	this.sliderTr = this.pagesTable.getElementsByTagName('tr')[1];
	this.pagesCells = this.pagesTr.getElementsByTagName('td');
	this.scrollbar = getElementsByClassName(this.pagesTable, 'div', 'scrollbar')[0];
	this.slider = getElementsByClassName(this.pagesTable, 'div', 'slider')[0];
	this.currentPagePoint = getElementsByClassName(this.pagesTable, 'div', 'current_page_point')[0];
}

Paginator.prototype.initSlider = function(){
	this.slider.xPos = 0;
	this.slider.style.width = this.pagesSpan/this.pagesTotal * 100 + "%";	
}

Paginator.prototype.initEvents = function(){
	var _this = this;

	this.slider.onmousedown = function(e){
		if (!e) var e = window.event;
		e.cancelBubble = true;
		if (e.stopPropagation) e.stopPropagation();

		this.dx = getMousePosition(e).x - this.xPos;
		document.onmousemove = function(e){
			if (!e) var e = window.event;
			_this.slider.xPos = getMousePosition(e).x - _this.slider.dx;
			_this.setSlider();
			_this.drawPages();
		}
		document.onmouseup = function(){
			document.onmousemove = null;
			_this.enableSelection();
		}
		_this.disableSelection();
	}

	this.scrollbar.onmousedown = function(e){
		if(matchClass(_this.paginatorBox, 'fullsize')) return;

		if (!e) var e = window.event;
		_this.slider.xPos = getMousePosition(e).x - getPageX(_this.scrollbar) - _this.slider.offsetWidth/2;
		_this.setSlider();
		_this.drawPages();
	}

	addEvent(window, 'resize', resizePaginator);
}

Paginator.prototype.setSlider = function(){
	this.slider.style.left = this.slider.xPos + "px";

}

Paginator.prototype.drawPages = function(){

	var percentFromLeft = this.slider.xPos/(this.pagesTable.offsetWidth);
	this.firstCellValue = Math.round(percentFromLeft * this.pagesTotal);
	var html = "";
	if(this.firstCellValue < 1){
		this.firstCellValue = 1;
		this.slider.xPos = 0;
		this.setSlider();
	} else if(this.firstCellValue >= this.pagesTotal - this.pagesSpan) {
		this.firstCellValue = this.pagesTotal - this.pagesSpan + 1;
		this.slider.xPos = this.pagesTable.offsetWidth - this.slider.offsetWidth;
		this.setSlider();
	}
	for(var i=0; i<this.pagesCells.length; i++){
		var currentCellValue = this.firstCellValue + i;
		var prefixLength = String(this.pagesTotal).length - String(currentCellValue).length;
		var prefix = this.makePrefix(prefixLength);
		if(currentCellValue == this.currentPage){
			html = "<span>" + "<em>" + String(currentCellValue) + "</em>" + String(prefix) + "</span>";
		} else {
			html = "<span>" + "<a style='cursor:pointer;color:black;' onclick='javascript:" + this.baseUrl + "("+ currentCellValue + ") ' >" + String(currentCellValue) + "</a>" + String(prefix) + "</span>";
		}
		this.pagesCells[i].innerHTML = html;
	}
}

Paginator.prototype.scrollToCurrentPage = function(){
	this.slider.xPos = (this.currentPage - Math.round(this.pagesSpan/2))/this.pagesTotal * this.pagesTable.offsetWidth;
	this.setSlider();
	this.drawPages();
}

Paginator.prototype.setCurrentPagePoint = function(){
	if(this.currentPage == 1){
		this.currentPagePoint.style.left = 0;
	} else {
		this.currentPagePoint.style.left = this.currentPage/this.pagesTotal * this.pagesTable.offsetWidth + "px";	
	}
}

Paginator.prototype.makePrefix = function(prefixLength){
	var prefix = "";
	for (var i=0; i<prefixLength; i++){
//		prefix += "_"; ###################### CODIGO ORIGINAL
		prefix += "";
	}
	return prefix;
}

Paginator.prototype.disableSelection = function(){
	document.onselectstart = function(){
		return false;
	}
	this.slider.focus();	
}

Paginator.prototype.enableSelection = function(){
	document.onselectstart = function(){
		return true;
	}
	this.slider.blur();		
}

resizePaginator = function (){
	if(typeof pag == 'undefined') return;

	pag.setCurrentPagePoint();
	pag.scrollToCurrentPage();
}