; (function ($) {
    /*******************************************************************************************/
    // jquery.pajinate.js - version 0.4
    // 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.pajinate = 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_id: '#cal_upcoming_events',
            items_per_page: 3,
            nav_panel_id: '.page_navigation',
            num_page_links_to_display: 10,
            start_page: 0,
            wrap_around: false,
            nav_label_first: '',
            nav_label_prev: '« Previous',
            nav_label_next: 'Next »'
          //  nav_label_last: '',
          //  show_first_last: true
        };
        var options = $.extend(defaults, options);
        var $item_container;
        var $page_container;
        var $items;
        var $nav_panels;
        var total_page_no_links;

        return this.each(function () {
            $page_container = $(this);
            $item_container = $(this).find(options.item_container_id);
            $items = $page_container.find(options.item_container_id).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);

            // Construct the nav bar
            var more = '<span class="ellipse more">...</span>';
            var less = '<span class="ellipse less">...</span>';

            var first = !options.show_first_last ? '' : '<a class="first_link" href="">' + options.nav_label_first + '</a>';
            var last = !options.show_first_last ? '' : '<a class="last_link" href="">' + options.nav_label_last + '</a>';

            var navigation_html = first;
            navigation_html += '<a class="previous_link" href="">' + options.nav_label_prev + '</a>' + less;
            var current_link = 0;
            while (number_of_pages > current_link) {
                navigation_html += '<a class="page_link" href="" longdesc="' + current_link + '">' + (current_link + 1) + '</a>';
                current_link++;
            }
            navigation_html += more + '<a class="next_link" href="">' + options.nav_label_next + '</a>';
            navigation_html += last;

            // 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('.page_link:first').addClass('first');
                $(this).find('.page_link:last').addClass('last');

            });

            // Hide the more/less indicators
            $nav_panels.children('.ellipse').hide();

            // Set the active page link styling
            $nav_panels.find('.previous_link').next().next().addClass('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

            total_page_no_links = $page_container.children(options.nav_panel_id + ':first').children('.page_link').size();
            options.num_page_links_to_display = Math.min(options.num_page_links_to_display, total_page_no_links);

            $nav_panels.children('.page_link').hide(); // Hide all the page links

            // And only show the number we should be seeing
            $nav_panels.each(function () {
                $(this).children('.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('.first_link').click(function (e) {
                e.preventDefault();

                movePageNumbersRight($(this), 0);
                goto(0);
            });

            // Event handler for 'Last' link
            $page_container.find('.last_link').click(function (e) {
                e.preventDefault();
                var lastPage = total_page_no_links - 1;
                movePageNumbersLeft($(this), lastPage);
                goto(lastPage);
            });

            // Event handler for 'Prev' link
            $page_container.find('.previous_link').click(function (e) {
                e.preventDefault();
                showPrevPage($(this));
            });


            // Event handler for 'Next' link
            $page_container.find('.next_link').click(function (e) {
                e.preventDefault();
                showNextPage($(this));
            });

            // Event handler for each 'Page' link
            $page_container.find('.page_link').click(function (e) {
                e.preventDefault();
                goto($(this).attr('longdesc'));
            });

            // Goto the required page
            goto(parseInt(options.start_page));
            toggleMoreLess();
            if (!options.wrap_around)
                tagNextPrev();
        });

        function showPrevPage(e) {
            new_page = parseInt(meta.data(current_page)) - 1;

            // Check that we aren't on a boundary link
            if ($(e).siblings('.active_page').prev('.page_link').length == true) {
                movePageNumbersRight(e, new_page);
                goto(new_page);
            } else if (options.wrap_around) {
                goto(total_page_no_links - 1);
            }

        };

        function showNextPage(e) {
            new_page = parseInt(meta.data(current_page)) + 1;

            // Check that we aren't on a boundary link
            if ($(e).siblings('.active_page').next('.page_link').length == true) {
                movePageNumbersLeft(e, new_page);
                goto(new_page);
            } else if (options.wrap_around) {
                goto(0);
            }

        };

        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('.page_link[longdesc=' + page_num + ']').addClass('active_page')
													 .siblings('.active_page')
													 .removeClass('active_page');

            // Set the current page meta data							
            meta.data(current_page, page_num);

            // Hide the more and/or less indicators
            toggleMoreLess();

            // Add a class to the next or prev links if there are no more pages next or previous to the active page
            tagNextPrev();
        };

        // 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('.active_page');

            if ($current_active_link.siblings('.page_link[longdesc=' + new_page + ']').css('display') == 'none') {

                $nav_panels.each(function () {
                    $(this).children('.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('.active_page');

            if ($current_active_link.siblings('.page_link[longdesc=' + new_page + ']').css('display') == 'none') {

                $nav_panels.each(function () {
                    $(this).children('.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('.page_link:visible').hasClass('last')) {
                $nav_panels.children('.more').show();
            } else {
                $nav_panels.children('.more').hide();
            }

            if (!$nav_panels.children('.page_link:visible').hasClass('first')) {
                $nav_panels.children('.less').show();
            } else {
                $nav_panels.children('.less').hide();
            }
        }

        /* Add the style class ".no_more" to the first/prev and last/next links to allow custom styling */
        function tagNextPrev() {
            if ($nav_panels.children('.last').hasClass('active_page')) {
                $nav_panels.children('.next_link').add('.last_link').addClass('no_more');
            } else {
                $nav_panels.children('.next_link').add('.last_link').removeClass('no_more');
            }

            if ($nav_panels.children('.first').hasClass('active_page')) {
                $nav_panels.children('.previous_link').add('.first_link').addClass('no_more');
            } else {
                $nav_panels.children('.previous_link').add('.first_link').removeClass('no_more');
            }
        }

    };

})(jQuery);