/*Paginator 3000
- idea by ecto (ecto.ru)
- coded by karaboz (karaboz.ru)
*/
var Paginator = function(paginatorHolderId, pagesTotal, pagesSpan, pageCurrent, baseUrl){
    if(!document.getElementById(paginatorHolderId) || !pagesTotal || !pagesSpan) return false;

    this.inputData = {
        paginatorHolderId: paginatorHolderId,
        pagesTotal: pagesTotal,
        pagesSpan: pagesSpan < pagesTotal ? pagesSpan : pagesTotal,
        pageCurrent: pageCurrent,
        baseUrl: baseUrl ? baseUrl : '/pages/'
    };

    this.html = {
        holder: null,

        table: null,
        trPages: null,
        trScrollBar: null,
        tdsPages: null,

        scrollBar: null,
        scrollThumb: null,
			
        pageCurrentMark: null
    };


    this.prepareHtml();

    this.initScrollThumb();
    this.initPageCurrentMark();
    this.initEvents();

    this.scrollToPageCurrent();
} 

/*
	Set all .html properties (links to dom objects)
*/
Paginator.prototype.prepareHtml = function(){

    this.html.holder = document.getElementById(this.inputData.paginatorHolderId);
    this.html.holder.innerHTML = this.makePagesTableHtml();

    this.html.table = this.html.holder.getElementsByTagName('table')[0];

    var trPages = this.html.table.getElementsByTagName('tr')[0];
    this.html.tdsPages = trPages.getElementsByTagName('td');

    this.html.scrollBar = getElementsByClassName(this.html.table, 'div', 'scroll_bar')[0];
    this.html.scrollThumb = getElementsByClassName(this.html.table, 'div', 'scroll_thumb')[0];
    this.html.pageCurrentMark = getElementsByClassName(this.html.table, 'div', 'current_page_mark')[0];

    // hide scrollThumb if there is no scroll (we see all pages at once)
    if(this.inputData.pagesSpan == this.inputData.pagesTotal){
        addClass(this.html.holder, 'fullsize');
    }
}

/*
	Make html for pages (table) 
*/
Paginator.prototype.makePagesTableHtml = function(){
    var tdWidth = (100 / this.inputData.pagesSpan) + '%';

    var html = '' +
    '<table width="100%">' +
    '<tr>'
    for (var i=1; i<=this.inputData.pagesSpan; i++){
        html += '<td width="' + tdWidth + '"></td>';
    }
    html += '' +
    '</tr>' +
    '<tr>' +
    '<td colspan="' + this.inputData.pagesSpan + '">' +
    '<div class="scroll_bar">' +
    '<div class="scroll_trough"></div>' +
    '<div class="scroll_thumb">' +
    '<div class="scroll_knob"></div>' +
    '</div>' +
    '<div class="current_page_mark"></div>' +
    '</div>' +
    '</td>' +
    '</tr>' +
    '</table>';

    return html;
}

/*
	Set all needed properties for scrollThumb and it's width
*/
Paginator.prototype.initScrollThumb = function(){
    this.html.scrollThumb.widthMin = '8'; // minimum width of the scrollThumb (px)
    this.html.scrollThumb.widthPercent = this.inputData.pagesSpan/this.inputData.pagesTotal * 100;

    this.html.scrollThumb.xPosPageCurrent = (this.inputData.pageCurrent - Math.round(this.inputData.pagesSpan/2))/this.inputData.pagesTotal * this.html.table.offsetWidth;
    this.html.scrollThumb.xPos = this.html.scrollThumb.xPosPageCurrent;

    this.html.scrollThumb.xPosMin = 0;
    this.html.scrollThumb.xPosMax;

    this.html.scrollThumb.widthActual;

    this.setScrollThumbWidth();
	
}

Paginator.prototype.setScrollThumbWidth = function(){
    // Try to set width in percents
    this.html.scrollThumb.style.width = this.html.scrollThumb.widthPercent + "%";

    // Fix the actual width in px
    this.html.scrollThumb.widthActual = this.html.scrollThumb.offsetWidth;

    // If actual width less then minimum which we set
    if(this.html.scrollThumb.widthActual < this.html.scrollThumb.widthMin){
        this.html.scrollThumb.style.width = this.html.scrollThumb.widthMin + 'px';
    }

    this.html.scrollThumb.xPosMax = this.html.table.offsetWidth - this.html.scrollThumb.widthActual;
}

Paginator.prototype.moveScrollThumb = function(){
    this.html.scrollThumb.style.left = this.html.scrollThumb.xPos + "px";
}


/*
	Set all needed properties for pageCurrentMark, it's width and move it
*/
Paginator.prototype.initPageCurrentMark = function(){
    this.html.pageCurrentMark.widthMin = '3';
    this.html.pageCurrentMark.widthPercent = 100 / this.inputData.pagesTotal;
    this.html.pageCurrentMark.widthActual;

    this.setPageCurrentPointWidth();
    this.movePageCurrentPoint();
}

Paginator.prototype.setPageCurrentPointWidth = function(){
    // Try to set width in percents
    this.html.pageCurrentMark.style.width = this.html.pageCurrentMark.widthPercent + '%';

    // Fix the actual width in px
    this.html.pageCurrentMark.widthActual = this.html.pageCurrentMark.offsetWidth;

    // If actual width less then minimum which we set
    if(this.html.pageCurrentMark.widthActual < this.html.pageCurrentMark.widthMin){
        this.html.pageCurrentMark.style.width = this.html.pageCurrentMark.widthMin + 'px';
    }
}

Paginator.prototype.movePageCurrentPoint = function(){
    if(this.html.pageCurrentMark.widthActual < this.html.pageCurrentMark.offsetWidth){
        this.html.pageCurrentMark.style.left = (this.inputData.pageCurrent - 1)/this.inputData.pagesTotal * this.html.table.offsetWidth - this.html.pageCurrentMark.offsetWidth/2 + "px";
    } else {
        this.html.pageCurrentMark.style.left = (this.inputData.pageCurrent - 1)/this.inputData.pagesTotal * this.html.table.offsetWidth + "px";
    }
}



/*
	Drag, click and resize events
*/
Paginator.prototype.initEvents = function(){
    var _this = this;

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

        var dx = getMousePosition(e).x - this.xPos;
        document.onmousemove = function(e){
            if (!e) var e = window.event;
            _this.html.scrollThumb.xPos = getMousePosition(e).x - dx;

            // the first: draw pages, the second: move scrollThumb (it was logically but ie sucks!)
            _this.moveScrollThumb();
            _this.drawPages();
			
			
        }
        document.onmouseup = function(){
            document.onmousemove = null;
            _this.enableSelection();
        }
        _this.disableSelection();
    }

    this.html.scrollBar.onmousedown = function(e){
        if (!e) var e = window.event;
        if(matchClass(_this.paginatorBox, 'fullsize')) return;
		
        _this.html.scrollThumb.xPos = getMousePosition(e).x - getPageX(_this.html.scrollBar) - _this.html.scrollThumb.offsetWidth/2;
		
        _this.moveScrollThumb();
        _this.drawPages();
		
		
    }

    // Comment the row beneath if you set paginator width fixed
    addEvent(window, 'resize', function(){
        Paginator.resizePaginator(_this)
        });
}

/*
	Redraw current span of pages
*/
Paginator.prototype.drawPages = function(){
    var percentFromLeft = this.html.scrollThumb.xPos/(this.html.table.offsetWidth);
    var cellFirstValue = Math.round(percentFromLeft * this.inputData.pagesTotal);
	
    var html = "";
    // drawing pages control the position of the scrollThumb on the edges!
    if(cellFirstValue < 1){
        cellFirstValue = 1;
        this.html.scrollThumb.xPos = 0;
        this.moveScrollThumb();
    } else if(cellFirstValue >= this.inputData.pagesTotal - this.inputData.pagesSpan) {
        cellFirstValue = this.inputData.pagesTotal - this.inputData.pagesSpan + 1;
        this.html.scrollThumb.xPos = this.html.table.offsetWidth - this.html.scrollThumb.offsetWidth;
        this.moveScrollThumb();
    }

	

    for(var i=0; i<this.html.tdsPages.length; i++){
        var cellCurrentValue = cellFirstValue + i;
        if(cellCurrentValue == this.inputData.pageCurrent){
            html = "<span>" + "<strong>" + cellCurrentValue + "</strong>" + "</span>";
        } else {
            html = "<span>" + "<a href='" + this.inputData.baseUrl + cellCurrentValue + "'>" + cellCurrentValue + "</a>" + "</span>";
        }
        this.html.tdsPages[i].innerHTML = html;
    }
}

/*
	Scroll to current page
*/
Paginator.prototype.scrollToPageCurrent = function(){
    this.html.scrollThumb.xPosPageCurrent = (this.inputData.pageCurrent - Math.round(this.inputData.pagesSpan/2))/this.inputData.pagesTotal * this.html.table.offsetWidth;
    this.html.scrollThumb.xPos = this.html.scrollThumb.xPosPageCurrent;
	
    this.moveScrollThumb();
    this.drawPages();
	
}



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

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

/*
	Function is used when paginator was resized (window.onresize fires it automatically)
	Use it when you change paginator with DHTML
	Do not use it if you set fixed width of paginator
*/
Paginator.resizePaginator = function (paginatorObj){

    paginatorObj.setPageCurrentPointWidth();
    paginatorObj.movePageCurrentPoint();

    paginatorObj.setScrollThumbWidth();
    paginatorObj.scrollToPageCurrent();
}




/*
	Global functions which are used
*/
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[nodesWithClassName.length] = nodes[i];
        }
    }
    return nodesWithClassName;
}


function addClass( objNode, strNewClass ) {
    replaceClass( objNode, strNewClass, '' );
}

function removeClass( objNode, strCurrClass ) {
    replaceClass( objNode, '', strCurrClass );
}

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 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
    }
}