/*
* * * * * * * * * * * * * * * * * * * * * *
*	  s l a s h j q u e r  y . c  o m
* tablePager v 1.1 - jQuery table widget
* Copyright (c) 2008 Rasmus Styrk
*
* 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.tablePager = function(options) {
        /*	Default values
        */
        var defaults = {
            offset: 0, //where to start
            limit: 10, // how many rows each page
            placeTop: false // place pager links over the table?
        };

        var options = $.extend(defaults, options);

        /*	Plugin variables
        */
        var parent = this;
        var rows = $("tbody > tr", parent);
        var totalItems = rows.length;
        var totalPages = Math.ceil((totalItems / options.limit));
        var currentPage = 1;

        /*	If the total amount of rows is bigger than the defined limit for each page, we do anything;
        */
        if (totalItems > options.limit) {
            /*	Did we have more than 1 page?, if yes, create some page links ;-)
            */
            var pages = "";
            if (totalPages > 1) {
                for (var i = 1; i <= totalPages; i++) {
                    pages += "<li><a href='javascript://' class='page' id='" + i + "'>" + i + "</a></li>";
                }
            }

            /*	HTML Layout for the links
            */
            var tb = $("<div id='pagerLinks'>\
					   		<ul>\
					   		<li><a href='javascript://' class='previousPage'><</a></li>\
							" + pages + "\
							<li><a href='javascript://' class='nextPage'>></a></li>\
							</ul>\
						</div>");

            /*	Appending it to the DOM
            */
            if (options.placeTop) {
                parent.before(tb);
            }
            else {
                parent.after(tb);
            }

            /*	And then we create functions for the links
            */
            $(".previousPage").click(
				function() {
				    options.offset = (options.offset == 0) ? (totalItems - options.limit) : (options.offset - options.limit);
				    currentPage = (currentPage == 1) ? totalPages : currentPage - 1;
				    parent.renderTable();
				}
			);

            $(".nextPage").click(
				function() {
				    options.offset = ((options.offset + options.limit) == totalItems) ? 0 : (options.offset + options.limit);
				    currentPage = (currentPage == totalPages) ? 1 : currentPage + 1;
				    parent.renderTable();
				}
			);

            $(".page").each
			(
			 	function() {
			 	    obj = $(this);
			 	    obj.click(
						function() {
						    options.offset = (this.id - 1) * options.limit;
						    currentPage = currentPage - (currentPage - this.id);
						    parent.renderTable();
						}
					);
			 	}
			);
        }

        /*	And finally we try to sort out witch rows should be visible ;-)
        */
        $.fn.renderTable = function() {
            var currentItem = 0;

            $("#pagerLinks *").removeClass("active");
            $("#" + currentPage).addClass("active");

            /*	So, if we are at last page we hide the next link ;-)
            */
            if (currentPage == totalPages) {
                $(".nextPage").css("visibility", "hidden");
            }
            else {
                $(".nextPage").css("visibility", "visible");
            }

            /*	If we are at first page we hide the prev link
            */
            if (currentPage == 1) {
                $(".previousPage").css("visibility", "hidden");
            }
            else {
                $(".previousPage").css("visibility", "visible");
            }

            /*	Run through all rows and check what we want to show
            */
            return rows.each
			(
				function() {
				    obj = $(this);

				    if (currentItem >= options.offset && currentItem < (options.offset + options.limit)) {
				        obj.show();
				    }
				    else {
				        obj.hide();
				    }

				    currentItem++;
				}
			);
        }

        /*	Initialize on page load
        */
        this.renderTable();
    };
})(jQuery);