;(function($){
/*******************************************************************************************/	
// jquery.paginate.js - version 0.2
// A jQuery plugin for paginating through any number of DOM elements
// 
// Copyright (c) 2010, Wes Nolte (http://wesnolte.com)
// Liscensed under the MIT License (MIT-LICENSE.txt)
// http://www.opensource.org/licenses/mit-license.php
// Created: 2010-04-16 | Updated: 2010-04-26
/*******************************************************************************************/

	$.fn.paginate = function(options){
		// Set some state information
		var current_page = 'current_page';
		var items_per_page = 'items_per_page';
		
		var meta;
	
		// Setup default option values
		var defaults = {
			item_container 				: '.content',
			items_per_page 				: 10,
			nav_panel_id 				: '.page_navigation',
			num_page_links_to_display 	: 20,
			start_page 					: 0,
			show_if_single_page			: false,
			nav_label_first 			: 'First',
			nav_label_prev 				: 'Prev',
			nav_label_next 				: 'Next',
			nav_label_last 				: 'Last',
			link_href					: '',
			class_active_page			: "current",
			class_page_link				: 'page_link',
			class_nav_label				: '',
			class_first_link			: 'first_link',
			class_previous_link			: 'previous_link',
			class_next_link				: 'next_link',
			class_last_link				: 'last_link',
			
			
		};
		var options = $.extend(defaults,options);
		var $item_container;
		var $page_container;
		var $items;
		var $nav_panels;
	
		return this.each(function(){
			$page_container = $(this);
			if(jQuery.type(options.item_container) === "string"){
				$item_container = $(this).find(options.item_container);
				$items = $page_container.find(options.item_container).children();
			} else {
				$item_container = options.item_container;
				$items = options.item_container.children();
			}
			meta = $page_container;
			
			// Initialise meta data
			meta.data(current_page,0);
			meta.data(items_per_page, options.items_per_page);
					
			// Get the total number of items
			var total_items = $item_container.children().size();
			
			// Calculate the number of pages needed
			var number_of_pages = Math.ceil(total_items/options.items_per_page);
			
			// If there's only one page, don't bother unless the settings say so.
			if(number_of_pages > 1 || options.show_if_single_page)
			{
				// Construct the nav bar
				var more = '<a class="ellipse more">...</a>';
				var less = '<a class="ellipse less">...</a>';
				
				var navigation_html = '<a class="'+ options.class_first_link +'" href="">'+ options.nav_label_first +'</a>';
				navigation_html += '<a class="'+ options.class_previous_link +'" href="">'+ options.nav_label_prev +'</a>'+ less;
				var current_link = 0;
				while(number_of_pages > current_link){
					navigation_html += '<a class="'+ options.class_page_link +'" href="" longdesc="' + current_link +'">'+ (current_link + 1) +'</a>';
					current_link++;
				}
				navigation_html += more + '<a class="'+ options.class_next_link +'" href="">'+ options.nav_label_next +'</a>';
				navigation_html += '<a class="'+ options.class_last_link +'" href="">'+ options.nav_label_last +'</a>';
				
				// And add it to the appropriate area of the DOM	
				$nav_panels = $page_container.find(options.nav_panel_id);			
				$nav_panels.html(navigation_html).each(function(){
				
					$(this).find('.'+options.class_page_link+':first').addClass('first');
					$(this).find('.'+options.class_page_link+':last').addClass('last');
					
				});
				
				// Hide the more/less indicators
				$nav_panels.children('.ellipse').hide();
				
				// Set the active page link styling
				$nav_panels.find('.'+options.class_previous_link).next().next().addClass(options.class_active_page);
				
				/* Setup Page Display */
				// And hide all pages
				$items.hide();
				// Show the first page			
				$items.slice(0, meta.data(items_per_page)).show();
	
				/* Setup Nav Menu Display */
				// Page number slices
				
				var total_page_no_links = $page_container.children(options.nav_panel_id+':first').children('.'+options.class_page_link).size();
				options.num_page_links_to_display = Math.min(options.num_page_links_to_display,total_page_no_links);
	
				$nav_panels.children('.'+options.class_page_link).hide(); // Hide all the page links
				
				// And only show the number we should be seeing
				$nav_panels.each(function(){
					$(this).children('.'+options.class_page_link).slice(0, options.num_page_links_to_display).show();			
				});
				
				/* Bind the actions to their respective links */
				 
				// Event handler for 'First' link
				$page_container.find('.'+options.class_first_link).click(function(e){
					e.preventDefault();
					
					movePageNumbersRight($(this),0);
					goto(0);				
				});			
				
				// Event handler for 'Last' link
				$page_container.find('.'+options.class_last_link).click(function(e){
					e.preventDefault();
					var lastPage = total_page_no_links - 1;
					movePageNumbersLeft($(this),lastPage);
					goto(lastPage);				
				});			
				
				// Event handler for 'Prev' link
				$page_container.find('.'+options.class_previous_link).click(function(e){
					e.preventDefault();
					showPrevPage($(this));
				});
				
				
				// Event handler for 'Next' link
				$page_container.find('.'+options.class_next_link).click(function(e){
					e.preventDefault();				
					showNextPage($(this));
				});
				
				// Event handler for each 'Page' link
				$page_container.find('.'+options.class_page_link).click(function(e){
					e.preventDefault();
					goto($(this).attr('longdesc'));
				});			
				
				// Goto the required page
				goto(parseInt(options.start_page));
				toggleMoreLess();
			}
		});
		
		function showPrevPage(e){
			new_page = parseInt(meta.data(current_page)) - 1;						
			
			// Check that we aren't on a boundary link
			if($(e).siblings('.'+options.class_active_page).prev('.'+options.class_page_link).length==true){
				movePageNumbersRight(e,new_page);
				goto(new_page);
			}
				
		};
			
		function showNextPage(e){
			new_page = parseInt(meta.data(current_page)) + 1;
			
			// Check that we aren't on a boundary link
			if($(e).siblings('.'+options.class_active_page).next('.'+options.class_page_link).length==true){		
				movePageNumbersLeft(e,new_page);
				goto(new_page);
			}
				
		};
			
		function goto(page_num){
			
			var ipp = meta.data(items_per_page);
			
			var isLastPage = false;
			
			// Find the start of the next slice
			start_from = page_num * ipp;
			
			// Find the end of the next slice
			end_on = start_from + ipp;
			// Hide the current page	
			$items.hide()
					.slice(start_from, end_on)
					.show();
			
			// Reassign the active class
			$page_container.find(options.nav_panel_id).children('.'+options.class_page_link+'[longdesc=' + page_num +']').addClass(options.class_active_page)
													 .siblings('.'+options.class_active_page)
													 .removeClass(options.class_active_page);										 
			
			// Set the current page meta data							
			meta.data(current_page,page_num);
			
			// Hide the more and/or less indicators
			toggleMoreLess();
		};	
		
		// Methods to shift the diplayed index of page numbers to the left or right
		function movePageNumbersLeft(e, new_p){
			var new_page = new_p;
			
			var $current_active_link = $(e).siblings('.'+options.class_active_page);
		
			if($current_active_link.siblings('.'+options.class_page_link+'[longdesc=' + new_page +']').css('display') == 'none'){
				
				$nav_panels.each(function(){
							$(this).children('.'+options.class_page_link)
								.hide() // Hide all the page links
								.slice(parseInt(new_page - options.num_page_links_to_display + 1) , new_page + 1)
								.show();		
							});
			}
			
		} 
		
		function movePageNumbersRight(e, new_p){
			var new_page = new_p;
			
			var $current_active_link = $(e).siblings('.'+options.class_active_page);
			
			if($current_active_link.siblings('.'+options.class_page_link+'[longdesc=' + new_page +']').css('display') == 'none'){
												
				$nav_panels.each(function(){
							$(this).children('.'+options.class_page_link)
								.hide() // Hide all the page links
								.slice( new_page , new_page + parseInt(options.num_page_links_to_display))
								.show();
							});
			}
		}
		
		// Show or remove the ellipses that indicate that more page numbers exist in the page index than are currently shown
		function toggleMoreLess(){
													 
			if(!$nav_panels.children('.'+options.class_page_link+':visible').hasClass('last')){					
				$nav_panels.children('.more').show();
			}else {
				$nav_panels.children('.more').hide();
			}
			
			if(!$nav_panels.children('.'+options.class_page_link+':visible').hasClass('first')){
				$nav_panels.children('.less').show();
			}else {
				$nav_panels.children('.less').hide();
			}			
		}
		
	};
	
})(jQuery);