/*
* jQuery pager plugin
* Version 1.0 (12/22/2008)
* @requires jQuery v1.2.6 or later
*
* Example at: http://jonpauldavies.github.com/JQuery/Pager/PagerDemo.html
*
* Copyright (c) 2008-2009 Jon Paul Davies
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
* 
*/

(function($) {

    $.fn.pager = function(options) {

        var opts = $.extend({}, $.fn.pager.defaults, options);
        
        return this.each(function() {
            $(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback));
            
            $('.pages li').mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });
        });
    };

    function renderpager(pagenumber, pagecount, buttonClickCallback) {
    	
        var $pager = $('<ul class="pages"></ul>');

        $pager.append(renderButton('prev', pagenumber, pagecount, buttonClickCallback));

        var startPoint = 1;
        var endPoint = 3;

        if (pagenumber > 3) {
            startPoint = pagenumber - 1;
            endPoint = pagenumber + 1;
        }

        if (endPoint > pagecount) {
            startPoint = pagecount - 2;
            endPoint = pagecount;
        }

        if (startPoint < 1) {
            startPoint = 1;
        }

        for (var page = startPoint; page <= endPoint; page++) {

            var currentButton = $('<li value="'+ (page) +'" class="page-number">' + (page) + '</li>');

            page == pagenumber ? currentButton.addClass('pgCurrent') : currentButton.click(function() { buttonClickCallback(this.firstChild.data); });
            currentButton.appendTo($pager);
        }

        $pager.append(renderButton('next', pagenumber, pagecount, buttonClickCallback))
        
        return $pager;
    }

    function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {

        

        var destPage = 1;

        switch (buttonLabel) {
            case "first":
                destPage = 1;
                break;
            case "prev":
                destPage = pagenumber - 1; 
                break;
            case "next":
                destPage = pagenumber + 1;
                break;
            case "last":
                destPage = pagecount;
                break;
        }
        
        var $Button = $('<li value="'+(destPage)+'" class="pg'+(buttonLabel)+'">' + buttonLabel + '</li>');

        if (buttonLabel == "first" || buttonLabel == "prev") {
            pagenumber <= 1 ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });
        }
        else {
            pagenumber >= pagecount ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });
        }

        return $Button;
    }

    $.fn.pager.defaults = {
        pagenumber: 1,
        pagecount: 1
    };

})(jQuery);