/*
* 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
* 
* Read the related blog post and contact the author at http://www.j-dee.com/2008/12/22/jquery-pager-plugin/
*
* This version is far from perfect and doesn't manage it's own state, therefore contributions are more than welcome!
*
* Usage: .pager({ pagenumber: 1, pagecount: 15, buttonClickCallback: PagerClickTest });
*
* Where pagenumber is the visible page number
*       pagecount is the total number of pages to display
*       buttonClickCallback is the method to fire when a pager button is clicked.
*
* buttonClickCallback signiture is PagerClickTest = function(pageclickednumber) 
* Where pageclickednumber is the number of the page clicked in the control.
*
* The included Pager.CSS file is a dependancy but can obviously tweaked to your wishes
* Tested in IE6 IE7 Firefox & Safari. Any browser strangeness, please report.
*
* 5/19/2009 - Praveen - Tweaked to show just 3 pages at a time.
* 4/30/2010 - Jim - Tweaked to make pageCount number take you to the last page.
*/
(function($) {

    $.fn.pager = function(options) {

        var opts = $.extend({}, $.fn.pager.defaults, options);

        return this.each(function() {

            // empty out the destination element and then render out the pager with the supplied options
            $(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback));

            //            // specify correct cursor activity
            //            $('.pages a').mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });
        });
    };

    // render and return the pager with the supplied options
    function renderpager(pagenumber, pagecount, buttonClickCallback) {
        // setup $pager to hold render
        var $pager = $('<div class="paging"></div>');

        $pager.append("Page&nbsp;");

        // add in the first and previous buttons
        $pager.append(renderButton('first', pagenumber, pagecount, buttonClickCallback)).append(renderButton('prev', pagenumber, pagecount, buttonClickCallback));

        //add an extra 'previous' page at the start if on last page
        if (pagenumber == pagecount && pagecount > 2) {
            var prevPrevPage = $('<a href="#' + (pagenumber - 2) + '" >' + (pagenumber - 2) + '</a>');
            prevPrevPage.click(function() { buttonClickCallback(this.firstChild.data); });
            prevPrevPage.appendTo($pager);
        }

        //prev page
        if (pagenumber != 1 && pagecount != 1) {
            var prevPage = $('<a href="#' + (pagenumber - 1) + '" >' + (pagenumber - 1) + '</a>');
            prevPage.click(function() { buttonClickCallback(this.firstChild.data); });
            prevPage.appendTo($pager);
        }

        //current page
        var currentButton = $('<a href="#' + pagenumber + '" >' + (pagenumber) + '</a>');
        currentButton.addClass('current');
        currentButton.appendTo($pager);

        //next page
        if (pagenumber != pagecount && pagecount != 1) {
            var nextPage = $('<a href="#' + (pagenumber + 1) + '" >' + (pagenumber + 1) + '</a>');
            nextPage.click(function() { buttonClickCallback(this.firstChild.data); });
            nextPage.appendTo($pager);
        }

        //add an extra 'next' page at the end if on first page
        if (pagenumber == 1 && pagecount > 2) {
            var nextNextPage = $('<a href="#' + (pagenumber + 2) + '" >' + (pagenumber + 2) + '</a>');
            nextNextPage.click(function() { buttonClickCallback(this.firstChild.data); });
            nextNextPage.appendTo($pager);
        }
        //add an clickable last page at the end
        var lastPage = $('<a href="#' + pagecount + '" >' + pagecount + '</a>');
        lastPage.click(function() { buttonClickCallback(this.firstChild.data); });
        $pager.append("&nbsp;of&nbsp;&nbsp;");
        lastPage.appendTo($pager);
        $pager.append("&nbsp;");


        // render in the next and last buttons before returning the whole rendered control back.
        $pager.append(renderButton('next', pagenumber, pagecount, buttonClickCallback)).append(renderButton('last', pagenumber, pagecount, buttonClickCallback));

        //        $pager.append("&nbsp;|");
        //        
        //        var viewAll = $('&nbsp;&nbsp;<a href="" onclick="return false;">View All</a>');
        //        viewAll.click(function() { buttonClickCallback(null); });
        //        viewAll.appendTo($pager);

        return $pager;
    }

    // renders and returns a 'specialized' button, ie 'next', 'previous' etc. rather than a page number button
    function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {

        var $Button;

        var destPage = 1;

        // work out destination page for required button type
        switch (buttonLabel) {
            case "first":
                destPage = 1;
                $Button = $('<a href="#' + destPage + '" ><img src="/Images/Com/Buttons/dbl_arrows_lt.gif" border="0" /></a>');
                break;
            case "prev":
                destPage = pagenumber - 1;
                $Button = $('<a href="#' + destPage + '" ><img src="/Images/Com/Buttons/arrow_lt.gif" border="0" /></a>');
                break;
            case "next":
                destPage = pagenumber + 1;
                $Button = $('<a href="#' + destPage + '" ><img src="/Images/Com/Buttons/arrow_rt.gif" border="0" /></a>');
                break;
            case "last":
                destPage = pagecount;
                $Button = $('<a href="#' + destPage + '" ><img src="/Images/Com/Buttons/dbl_arrows_rt.gif" border="0" /></a>');
                break;
        }

        // disable and 'grey' out buttons if not needed.
        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;
    }

    // pager defaults. hardly worth bothering with in this case but used as placeholder for expansion in the next version
    $.fn.pager.defaults = {
        pagenumber: 1,
        pagecount: 1
    };

})(jQuery);