/*
	jQuery Paging plugin
	2008, Paul van Dam
*/

(function($){
$.fn.paging = function (options) {
	
	var opt = {
		itemsPerPage: 5,
		elementType: 'li',
		prevText: 'prev',
		nextText: 'next',
		selectedClass: 'selected',
		navClass: 'pagenav',
		prevClass: 'prev',
		nextClass: 'next',
		disabledClass: 'disabled',
		addNav: 'after',
		showPageNumbers: true,
		trimPageNumbers: false
	};

	if (options) $.extend(opt, options);

	if (opt.elementType == 'tr') opt.elementType = 'tbody>tr';

	return this.each (function () {

		var self = this;
		var pages = Math.ceil($('>'+opt.elementType,$(this)).length/opt.itemsPerPage);
		var currentPage = 1;
		
		if (pages > 1) {
			var html = '<a href="" class="'+opt.prevClass+'" rel="prev">'+opt.prevText+'</a>';
			if (opt.showPageNumbers) {
				for (var i=1; i<=pages; i++)
					html += '<a href="" rel="'+i+'">'+i+'</a>';
			}
			html += '<a href="" class="'+opt.nextClass+'" rel="next">'+opt.nextText+'</a>';
			var pagenav = $('<div class="'+opt.navClass+'">'+html+'</div>');
			
			if (opt.addNav == 'before')
				pagenav.insertBefore($(this));
			else
				pagenav.insertAfter($(this));

			$('a',pagenav).click(function(){
				showPage($(this).attr('rel'));
				$(this).blur();
				return false;
			});

			showPage(currentPage);
		}

		function showPage(nr) {
			$(self).triggerHandler('pagingBeforePageChange');

			if (nr == 'next') {
				if (currentPage == pages) return;
				currentPage ++;
			} else if (nr == 'prev') {
				if (currentPage == 1) return;
				currentPage --;
			} else
				currentPage = parseInt(nr);
			
			if (currentPage == 1)
				$('a[rel=prev]',pagenav).addClass(opt.disabledClass);
			else
				$('a[rel=prev]',pagenav).removeClass(opt.disabledClass);

			if (currentPage == pages)
				$('a[rel=next]',pagenav).addClass(opt.disabledClass);
			else
				$('a[rel=next]',pagenav).removeClass(opt.disabledClass);

			$('>'+opt.elementType+':visible',self).hide();

			// Fix for jQuery 1.3
			var selector = '>'+opt.elementType;
			if (currentPage != 1)
				selector += ':gt('+(((currentPage-1)*opt.itemsPerPage)-1)+')';
			selector += ':lt('+opt.itemsPerPage+')';
			$(selector,self).show();

			$('a',pagenav).removeClass(opt.selectedClass);
			$('a[rel='+currentPage+']',pagenav).addClass(opt.selectedClass);


			// Trim page numbers if more than 5 (TODO: make option)
			if (opt.trimPageNumbers && pages > 5) {
				var p = [1,pages];
				if (currentPage!=1 && currentPage!=pages) p.push(currentPage);
				if (currentPage-1>1) p.push(currentPage-1);
				if (currentPage+1<pages) p.push(currentPage+1);

				// Edge cases
				if (currentPage == 1) { p.push(3); p.push(4); }
				if (currentPage == 2) { p.push(4); }
				if (currentPage == pages) { p.push(pages-3); p.push(pages-2); }
				if (currentPage == pages-1) { p.push(pages-3); }

				// Show only selected page numbers
				var s = [];
				$(p).each(function(i,e){
					s.push('a[rel='+e+']');
				});

				pagenav.find('a:not(.prev):not(.next)').hide();
				pagenav.find(s.join(',')).show();
			}

			$(self).triggerHandler('pagingAfterPageChange');
		};

	});
};
})(jQuery);