/* ===========================================================================
 *
 * 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 : "qp_next",

		next : "qp_prev",
		
		pagenumber : "qp_pagenumber",
		
		totalnumber : "qp_totalnumber",
		
		counter : "qp_counter"

	}, settings);

	var cm;
	
	var total;
	
	var last = false;
	
	var first = true;
	
	var items = jQuery(this);
	
	var nextbut;
	
	var prevbut;
	
	var current = 0;
	
	var init = function()
	{
		items.show();
		
		total = items.size();
				
		if ( items.size() > settings.perpage )
		{
			items.filter(":gt("+(settings.perpage-1)+")").hide();
			
			cm = settings.perpage;
			
			setNav(cm-1);
		}
	};
	
	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("qp_disabled");
			}
			
			if ( settings.showcounter ) settings.pager.find("."+settings.pagenumber).text(cm/settings.perpage);
			
			prevbut.removeClass("qp_disabled");
			first = false;
			
			setNav(cm-1);
		}
	};

	var goCurrent = function(e)
	{
		var current = $(e).attr('rel') - 1;

		cm = parseInt(current); 
		var nm = cm + 1;
		items.hide();
	
		items.slice( cm, nm ).show();
		cm = nm;

		if ( cm >= total  )
		{
			last = true;
			nextbut.addClass("qp_disabled");
		}else{
			last = false;
			nextbut.removeClass("qp_disabled");
		}
			
		if ( cm == settings.perpage  )
		{
			first = true;
			prevbut.addClass("qp_disabled");
		}else{
			first = false;
			prevbut.removeClass("qp_disabled");
		}
		setNav(current);

	};
	
	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("qp_disabled");
			}
			
			if ( settings.showcounter ) settings.pager.find("."+settings.pagenumber).text(cm/settings.perpage);
			
			nextbut.removeClass("qp_disabled");
			last = false;
			
			setNav(cm-1);
		}
	};
	
	var setNav = function(current)
	{
		if ( settings.pager === null )
		{	
			settings.pager = jQuery('<div class="qc_pager"></div>');
			items.eq( items.size() -1 ).after(settings.pager);
		}
		
		var str = '<a class="'+settings.prev+'" href="#page_press_release"><span class="hidden">&laquo;</span></a>';
		
		var allPage = Math.ceil(total / settings.perpage);
		var fromPage = (current - 1 > 1 && current - 1 < allPage - 5 ) ? current - 1  : (current - 1 < allPage - 5) ?  1 : allPage - 4;
		var toPage =  (current + 3 < (allPage-1) && current + 3 >= 5) ? current + 3 : (current + 3 < allPage - 1) ?  5 : allPage;

		for(var i = fromPage; i <= toPage ; i++) {
			var active = (current == i-1) ? 'active' : '';
			str += '<a href="#page_press_release" class="page ' + active + '" rel="'+ i +'">';
			str += i;				
			str += '</a>';
		} 
		str += '<a class="'+settings.next+'" href="#page_press_release"><span class="hidden">&raquo;</span></a>';
		var pagerNav = $(str);
		
		
		jQuery(settings.pager).html( pagerNav );
		
		if ( settings.showcounter )
		{
			var counter = '<span class="'+settings.counter+'"><span class="'+settings.pagenumber+'"></span> / <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);
		currentbut = settings.pager.find(".page");
		prevbut = settings.pager.find("."+settings.prev);
		
		prevbut.addClass("qp_disabled");
		
		nextbut.click(function(){
			goNext();
			return false;
		});
		
		currentbut.click(function(){
			goCurrent(this);
			return false;
		});
		
		prevbut.click(function(){
			goPrev();
			return false;
		});
		
	};
	
	init(); // run the function
};