/* ===========================================================================
 *
 * JQuery Quick Pagination
 * Version 1.0.1
 * Quick and dirty pagination for pretty much any set of elements on the page.
 *
 * Author: Mark Perkins
 * Author email: mark@allmarkedup.com
 * For full documentation and more go to http://projects.allmarkedup.com/jquery_quick_paginate/
 *
 * ---------------------------------------------------------------------------
 *
 * LICENCE:
 *
 * Released under a MIT Licence. See licence.txt that should have been supplied with this file,
 * or visit http://projects.allmarkedup.com/jquery_quick_paginate/licence.txt
 *
 * ---------------------------------------------------------------------------
 * 
 * EXAMPLES OF USE:
 *
 * jQuery('.news_item').quickpaginate(); // would paginate all items on the page with the class of 'news_item'
 * 
 * jQuery('div#quick_slideshow img').quickpaginate(); // would paginate all img elements within the div with an id of 'quick_slideshow'
 *
 * // Paginate everything with the class of "news_item",
 * // 5 per 'page' and without the page counter.
 * jQuery('.news_item').quickpaginate( { perpage: 5, showcounter: false } ); 
 *
 * // Paginate all img elements and the element with the id of "info",
 * // with the prev/next/counter element appended to the element with the id of "pager_here"
 * jQuery('img, #info').quickpaginate({ pager : $("#pager_here") });
 *
 */

jQuery.fn.quickpaginate = function(settings){
	settings = jQuery.extend({   
		perpage: 5,		
		pager: null,		
		showcounter: true,		
		prev: "pagination-next",
		next: "pagination-prev",		
		pagenumber: "pagination-pagenumber",		
		totalnumber: "pagination-totalnumber",		
		counter: "pagination-counter"
	}, settings);
	
	var cm;
	var total;
	var last = false;
	var first = true;
	var items = jQuery(this);
	var nextbut;
	var prevbut;
	var init = function(){
		items.show();
		total = items.size();
		if ( items.size() > settings.perpage ){
			items.filter(":gt("+(settings.perpage-1)+")").hide();
			cm = settings.perpage;
			setNav();
		}
	};
	var goNext = function(){
		if ( !last ){
			var nm = cm + settings.perpage;
			items.hide();
			items.slice( cm, nm ).show();
			cm = nm;
			if ( cm >= total ){
				last = true;
				nextbut.addClass("pagination-disabled");
			}
			if ( settings.showcounter ) settings.pager.find("."+settings.pagenumber).text(cm/settings.perpage);			
			prevbut.removeClass("pagination-disabled");
			first = false;
		}
	};
	var goPrev = function(){
		if ( !first ){
			var nm = cm-settings.perpage;
			items.hide();			
			items.slice( (nm - settings.perpage), nm ).show();
			cm = nm;			
			if ( cm == settings.perpage ){
				first = true;
				prevbut.addClass("pagination-disabled");
			}
			if ( settings.showcounter ) settings.pager.find("."+settings.pagenumber).text(cm/settings.perpage);			
			nextbut.removeClass("pagination-disabled");
			last = false;
		}
	};
	var setNav = function(){
		if ( settings.pager === null ){	
			settings.pager = jQuery('<div class="pagination"></div>');
			items.eq( items.size() -1 ).after(settings.pager);
		}		
		var pagerNav = $('<a href="#" class="'+settings.prev+'">&lsaquo;</a><a href="#" class="'+settings.next+'">&rsaquo;</a>');		
		jQuery(settings.pager).append( pagerNav );
		if ( settings.showcounter ){
			var counter = '<span class="'+settings.counter+'">Page <span class="'+settings.pagenumber+'"></span> of <span class="'+settings.totalnumber+'"></span></span>';			
			settings.pager.find("."+settings.prev).after( counter );	
			settings.pager.find("."+settings.pagenumber).text( 1 );
			settings.pager.find("."+settings.totalnumber).text( Math.ceil(total / settings.perpage) );
		}
		nextbut = settings.pager.find("."+settings.next);
		prevbut = settings.pager.find("."+settings.prev);
		prevbut.addClass("pagination-disabled");
		nextbut.click(function(){
			goNext();
			return false;
		});
		prevbut.click(function(){
			goPrev();
			return false;
		});
	};
	init(); // run the function
};