/* ===========================================================================
*
* 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: 6,

        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 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("qp_disabled");
            }

            if (settings.showcounter) settings.pager.find("." + settings.pagenumber).text(cm / settings.perpage);

            prevbut.removeClass("qp_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("qp_disabled");
            }

            if (settings.showcounter) settings.pager.find("." + settings.pagenumber).text(cm / settings.perpage);

            nextbut.removeClass("qp_disabled");
            last = false;
        }
    };

    var setNav = function() {
        if (settings.pager === null) {
            settings.pager = jQuery('<div class="qc_pager"></div>');
            items.eq(items.size() - 1).after(settings.pager);
        }

        var pagerNav = $('<a class="' + settings.prev + '" href="#">&laquo;</a><a class="' + settings.next + '" href="#">&raquo;</a>');

        jQuery(settings.pager).append(pagerNav);

        if (settings.showcounter) {
            var counter = '<span class="' + settings.counter + '"><strong><span class="' + settings.pagenumber + '"></span></strong> de <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("qp_disabled");

        nextbut.click(function() {
            goNext();
            return false;
        });

        prevbut.click(function() {
            goPrev();
            return false;
        });

    };

    init(); // run the function
};