/*
 * jQuery galleryScroll v1.4.8 
 *
 * Copyright (c) 2008 Taranets Aleksey
 * www: markup-javascript.com
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 */

/*
	************* OPTIONS ************************************** default ****************
	btPrev         - link for previos [selector]    	btPrev: 'a.link-prev'
	btNext         - link for next [selector]		btNext: 'a.link-next'
	holderList     - image list holder [Tag name]		holderList: 'div'
	scrollElParent - list [Tag name]			scrollElParent: 'ul'
	scrollEl       - list element [Tag name]		scrollEl: 'li'
	slideNum       - view slide numbers [boolean]		slideNum: false
	duration       - duration slide [1000 - 1sec]		duration : 1000
	step           - slide step [int]			step: false
	circleSlide    - slide circle [boolean]			circleSlide: true
	disableClass   - class for disable link	[string] 	disableClass: 'disable'
	funcOnclick    - callback function			funcOnclick: null
	innerMargin    - inner margin, use width step [px]      innerMargin:0
	autoSlide      - auto slide [1000 - 1sec]               autoSlide:false
	*************************************************************************************
*/
jQuery.fn.galleryScroll = function(_options){
	// defaults options	
	var _options = jQuery.extend({
		btPrev: 'a.link-prev',
		btNext: 'a.link-next',
		holderList: 'div',
		scrollElParent: 'ul',
		scrollEl: 'li',
		slideNum: false,
		duration : 1000,
		step: false,
		circleSlide: true,
		disableClass: 'disable',
		funcOnclick: null,
		autoSlide:false,
		innerMargin:0,
		stepWidth:false
	},_options);

	return this.each(function(){
		var _this = jQuery(this);
		if(_this.find(_options.scrollEl).length>5){
			var _gWidth = jQuery(_options.holderList,_this).width();
			var _liWidth = jQuery(_options.scrollEl,_this).outerWidth(true);
			var _liSum = jQuery(_options.scrollEl,_this).length * _liWidth;
			var _margin = -_options.innerMargin;
			var f = 0;
			var _step = 0;
			var _autoSlide = _options.autoSlide;
			var _timerSlide = null;
			if (!_options.step) _step = _gWidth; else _step = _options.step*_liWidth;
			if (_options.stepWidth) _step = _options.stepWidth;
			
			if (!_options.circleSlide) {
				if (_options.innerMargin == _margin)
					jQuery(_options.btPrev,_this).addClass(_options.disableClass);
			}
			if (_options.slideNum && !_options.step) {
				var _lastSection = 0;
				var _sectionWidth = 0;
				while(_sectionWidth < _liSum)
				{
					_sectionWidth = _sectionWidth + _gWidth;
					if(_sectionWidth > _liSum) {
					       _lastSection = _sectionWidth - _liSum;
					}
				}
			}
			if (_autoSlide) {
					_timerSlide = setTimeout(function(){
						autoSlide(_autoSlide);
					}, _autoSlide);
				jQuery(_options.scrollElParent,_this).hover(function(){
					clearTimeout(_timerSlide);
				}, function(){
					_timerSlide = setTimeout(function(){
						autoSlide(_autoSlide)
					}, _autoSlide);
				});
			}
			// click button 'Next'
			jQuery(_options.btNext,_this).bind('click',function(){
				jQuery(_options.btPrev,_this).removeClass(_options.disableClass);
				if (!_options.circleSlide) {
					if (_margin + _step  > _liSum - _gWidth - _options.innerMargin) {
						if (_margin != _liSum - _gWidth - _options.innerMargin) {
							_margin = _liSum - _gWidth  + _options.innerMargin;
							jQuery(_options.btNext,_this).addClass(_options.disableClass);
							_f2 = 0;
						} 
					} else {
						_margin = _margin + _step;
						if (_margin == _liSum - _gWidth - _options.innerMargin) {
							jQuery(_options.btNext,_this).addClass(_options.disableClass);_f2 = 0;
						} 					
					}
				} else {
					if (_margin + _step  > _liSum - _gWidth + _options.innerMargin) {
						if (_margin != _liSum - _gWidth + _options.innerMargin) {
							_margin = _liSum - _gWidth  + _options.innerMargin;
						} else {
							_f2 = 1;
							_margin = -_options.innerMargin;
						}
					} else {
						_margin = _margin + _step;
						_f2 = 0;
					}
				} 
				
				jQuery(_options.scrollElParent,_this).animate({marginLeft: -_margin+"px"}, {queue:false,duration: _options.duration });
				
				if (_timerSlide) {
					clearTimeout(_timerSlide);
					_timerSlide = setTimeout(function(){
						autoSlide(_options.autoSlide)
					}, _options.autoSlide);
				}
				
				if (_options.slideNum && !_options.step) jQuery.fn.galleryScroll.numListActive(_margin,jQuery(_options.slideNum, _this),_gWidth,_lastSection);		
				if (jQuery.isFunction(_options.funcOnclick)) {
					_options.funcOnclick.apply(_this);
				}
				return false;
			});
			// click button 'Prev'
			var _f2 = 1;
			jQuery(_options.btPrev, _this).bind('click',function(){
				jQuery(_options.btNext,_this).removeClass(_options.disableClass);
				if (_margin - _step >= -_step - _options.innerMargin && _margin - _step <= -_options.innerMargin) {
					if (_f2 != 1) {
						_margin = -_options.innerMargin;
						_f2 = 1;
					} else {
						if (_options.circleSlide) {
							_margin = _liSum - _gWidth  + _options.innerMargin;
							f=1;_f2=0;
						} else {
							_margin = -_options.innerMargin
						}
					}
				} else if (_margin - _step < -_step + _options.innerMargin) {
					_margin = _margin - _step;
					f=0;
				}
				else {_margin = _margin - _step;f=0;};
				
				if (!_options.circleSlide && _margin == _options.innerMargin) {
					jQuery(this).addClass(_options.disableClass);
					_f2=0;
				}
				
				if (!_options.circleSlide && _margin == -_options.innerMargin) jQuery(this).addClass(_options.disableClass);
				jQuery(_options.scrollElParent,_this).animate({marginLeft: -_margin + "px"}, {queue:false, duration: _options.duration});
				
				if (_options.slideNum && !_options.step) jQuery.fn.galleryScroll.numListActive(_margin,jQuery(_options.slideNum, _this),_gWidth,_lastSection);
				
				if (_timerSlide) {
					clearTimeout(_timerSlide);
					_timerSlide = setTimeout(function(){
						autoSlide(_options.autoSlide)
					}, _options.autoSlide);
				}
				
				if (jQuery.isFunction(_options.funcOnclick)) {
					_options.funcOnclick.apply(_this);
				}
				return false;
			});
			
			if (_liSum <= _gWidth) {
				jQuery(_options.btPrev,_this).addClass(_options.disableClass).unbind('click');
				jQuery(_options.btNext,_this).addClass(_options.disableClass).unbind('click');
			}
			// auto slide
			function autoSlide(autoSlideDuration){
				//if (_options.circleSlide) {
					if (_liSum - _step  <= _margin + _step - _options.innerMargin) {
						if (f == 0) {
							_margin = _liSum - _gWidth  + _options.innerMargin;
							f = 1;_f2=0;
							if (!_options.circleSlide) 
								jQuery(_options.btPrev, _this).addClass(_options.disableClass);
						} 
						else {
							if (_options.circleSlide) 
								_margin = _options.innerMargin;
							f=0;_f2=0;
						}
					} else _margin = _margin + _step;
					
					jQuery(_options.scrollElParent,_this).animate({marginLeft: -_margin+"px"}, {queue:false,duration: _options.duration });
					
					_timerSlide = setTimeout(function(){
						autoSlide(_options.autoSlide)
					}, _options.autoSlide);
					jQuery.fn.galleryScroll.numListActive(_margin, jQuery(_options.slideNum, _this),_gWidth,_lastSection);
				//}
			};
			// Number list
			jQuery.fn.galleryScroll.numListCreate = function(_elNumList, _liSumWidth, _width, _section){
				var _numListElC = '';
				var _num = 1;
				var _difference = _liSumWidth + _section;
				while(_difference > 0)
				{
					_numListElC += '<li><a href="">'+_num+'</a></li>';
					_num++;
					_difference = _difference - _width;
				}
				jQuery(_elNumList).html('<ul>'+_numListElC+'</ul>');
			};
			jQuery.fn.galleryScroll.numListActive = function(_marginEl, _slideNum, _width, _section){
				if (_slideNum) {
					jQuery('a',_slideNum).removeClass('active');
					var _activeRange = _width - _section-1;
					var _n = 0;
					if (_marginEl != 0) {
						while (_marginEl > _activeRange) {
							_activeRange = (_n * _width) -_section-1 + _options.innerMargin;
							_n++;
						}
					}
					var _a  = (_activeRange+_section+1 + _options.innerMargin)/_width - 1;
					jQuery('a',_slideNum).eq(_a).addClass('active');
				}
			};
			if (_options.slideNum && !_options.step) {
				jQuery.fn.galleryScroll.numListCreate(jQuery(_options.slideNum, _this), _liSum, _gWidth,_lastSection);
				jQuery.fn.galleryScroll.numListActive(_margin, jQuery(_options.slideNum, _this),_gWidth,_lastSection);
				numClick();
			};
			function numClick() {
				jQuery(_options.slideNum, _this).find('a').click(function(){
					jQuery(_options.btPrev,_this).removeClass(_options.disableClass);
					jQuery(_options.btNext,_this).removeClass(_options.disableClass);
					
					var _indexNum = jQuery(_options.slideNum, _this).find('a').index(jQuery(this));
					_margin = (_step*_indexNum) - _options.innerMargin;
					f=0; _f2=0;
					if (_indexNum == 0) _f2=1;
					if (_margin + _step > _liSum) {
						_margin = _margin - (_margin - _liSum) - _step + _options.innerMargin;
						if (!_options.circleSlide) jQuery(_options.btNext, _this).addClass(_options.disableClass);
					}
					jQuery(_options.scrollElParent,_this).animate({marginLeft: -_margin + "px"}, {queue:false, duration: _options.duration});
					
					if (!_options.circleSlide && _margin==0) jQuery(_options.btPrev,_this).addClass(_options.disableClass);
					jQuery.fn.galleryScroll.numListActive(_margin, jQuery(_options.slideNum, _this),_gWidth,_lastSection);
					
					if (_timerSlide) {
						clearTimeout(_timerSlide);
						_timerSlide = setTimeout(function(){
							autoSlide(_options.autoSlide)
						}, _options.autoSlide);
					}
					return false;
				});
			};
			jQuery(window).resize(function(){
				_gWidth = jQuery(_options.holderList,_this).width();
				_liWidth = jQuery(_options.scrollEl,_this).outerWidth(true);
				_liSum = jQuery(_options.scrollEl,_this).length * _liWidth;
				if (!_options.step) _step = _gWidth; else _step = _options.step*_liWidth;
				if (_options.slideNum && !_options.step) {
					var _lastSection = 0;
					var _sectionWidth = 0;
					while(_sectionWidth < _liSum)
					{
						_sectionWidth = _sectionWidth + _gWidth;
						if(_sectionWidth > _liSum) {
						       _lastSection = _sectionWidth - _liSum;
						}
					};
					jQuery.fn.galleryScroll.numListCreate(jQuery(_options.slideNum, _this), _liSum, _gWidth,_lastSection);
					jQuery.fn.galleryScroll.numListActive(_margin, jQuery(_options.slideNum, _this),_gWidth,_lastSection);
					numClick();
				};
				if (_margin == _options.innerMargin) jQuery(this).addClass(_options.disableClass);
				if (_liSum - _gWidth  < _margin - _options.innerMargin) {
					if (!_options.circleSlide) jQuery(_options.btNext, _this).addClass(_options.disableClass);
					jQuery(_options.scrollElParent,_this).animate({marginLeft: -(_liSum - _gWidth + _options.innerMargin) + "px"}, {queue:false, duration: _options.duration});
				};
			});
		}else{
			jQuery(_options.btPrev).hide();
			jQuery(_options.btNext).hide();
		}
	});
}