/*
 * 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.
 */
(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,options.firstButton,options.lastButton,options.prevButton,options.nextButton));

					// specify correct cursor activity
					$('.pages li').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,firstButton,lastButton,prevButton,nextButton) {

		// setup $pager to hold render
		var $pager = $('<ul class="pages"></ul>');

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

		// pager currently only handles 10 viewable pages ( could be easily
		// parameterized, maybe in next version ) so handle edge cases
		var startPoint = 1;
		var endPoint = 9;

		if (pagenumber > 4) {
			startPoint = pagenumber - 4;
			endPoint = pagenumber + 4;
		}

		if (endPoint > pagecount) {
			startPoint = pagecount - 8;
			endPoint = pagecount;
		}

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

		// loop thru visible pages and render buttons
		for (var page = startPoint; page <= endPoint; page++) {

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

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

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

		return $pager;
	}

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

		var $Button = $('<li class="pgNext">' + buttonLabel + '</li>');

		var destPage = 1;

		// work out destination page for required button type
		switch (button) {
			case "first" :
				destPage = 1;
				break;
			case "prev" :
				destPage = pagenumber - 1;
				break;
			case "next" :
				destPage = pagenumber + 1;
				break;
			case "last" :
				destPage = pagecount;
				break;
		}

		// disable and 'grey' out buttons if not needed.
		if (button == "first" || button == "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,
		firstButton : 'Prem',
		lastButton : 'Dern',
		prevButton : 'Prec',
		nextButton : 'Suiv'
	};

})(jQuery);