(function($){

	var methods = {
		init: function(options) {
			var o = $.extend({
				items: 1,
				itemsonpage: 1,
				pages: 0,
				displayedpages: 3,
				edges: 2,
				currentpage: 1,
				hreftextprefix: '?page=',
				hreftextsuffix: '',
				prevtext: '上一页',
				nexttext: '下一页',
				ellipsetext: '…',
				cssstyle: 'light-theme',
				labelmap: [],
				selectonclick: true,
				onpageclick: function(pagenumber, event) {
					// callback triggered when a page is clicked
					// page number is given as an optional parameter
				},
				oninit: function() {
					// callback triggered immediately after initialization
				}
			}, options || {});

			var self = this;

			o.pages = o.pages ? o.pages : math.ceil(o.items / o.itemsonpage) ? math.ceil(o.items / o.itemsonpage) : 1;
			o.currentpage = o.currentpage - 1;
			o.halfdisplayed = o.displayedpages / 2;

			this.each(function() {
				self.addclass(o.cssstyle + ' simple-pagination').data('pagination', o);
				methods._draw.call(self);
			});

			o.oninit();

			return this;
		},

		selectpage: function(page) {
			methods._selectpage.call(this, page - 1);
			return this;
		},

		prevpage: function() {
			var o = this.data('pagination');
			if (o.currentpage > 0) {
				methods._selectpage.call(this, o.currentpage - 1);
			}
			return this;
		},

		nextpage: function() {
			var o = this.data('pagination');
			if (o.currentpage < o.pages - 1) {
				methods._selectpage.call(this, o.currentpage + 1);
			}
			return this;
		},

		getpagescount: function() {
			return this.data('pagination').pages;
		},

		getcurrentpage: function () {
			return this.data('pagination').currentpage + 1;
		},

		destroy: function(){
			this.empty();
			return this;
		},

		drawpage: function (page) {
			var o = this.data('pagination');
			o.currentpage = page - 1;
			this.data('pagination', o);
			methods._draw.call(this);
			return this;
		},

		redraw: function(){
			methods._draw.call(this);
			return this;
		},

		disable: function(){
			var o = this.data('pagination');
			o.disabled = true;
			this.data('pagination', o);
			methods._draw.call(this);
			return this;
		},

		enable: function(){
			var o = this.data('pagination');
			o.disabled = false;
			this.data('pagination', o);
			methods._draw.call(this);
			return this;
		},

		updateitems: function (newitems) {
			var o = this.data('pagination');
			o.items = newitems;
			o.pages = methods._getpages(o);
			this.data('pagination', o);
			methods._draw.call(this);
		},

		updateitemsonpage: function (itemsonpage) {
			var o = this.data('pagination');
			o.itemsonpage = itemsonpage;
			o.pages = methods._getpages(o);
			this.data('pagination', o);
			methods._selectpage.call(this, 0);
			return this;
		},

		_draw: function() {
			var	o = this.data('pagination'),
				interval = methods._getinterval(o),
				i,
				tagname;

			methods.destroy.call(this);
			
			tagname = (typeof this.prop === 'function') ? this.prop('tagname') : this.attr('tagname');

			var $panel = tagname === 'ul' ? this : $('<ul></ul>').appendto(this);

			$panel.prepend('<li><span>总记录数：'+o.items+'</span></li>');
			// generate prev link
			methods._appenditem.call(this, 0, {text: "首页", classes: 'first'});
			
			if (o.prevtext) {
				methods._appenditem.call(this, o.currentpage - 1, {text: o.prevtext, classes: 'prev'});
			}

			// generate start edges
			if (interval.start > 0 && o.edges > 0) {
				var end = math.min(o.edges, interval.start);
				for (i = 0; i < end; i++) {
					methods._appenditem.call(this, i);
				}
				if (o.edges < interval.start && (interval.start - o.edges != 1)) {
					$panel.append('<li class="disabled"><span class="ellipse">' + o.ellipsetext + '</span></li>');
				} else if (interval.start - o.edges == 1) {
					methods._appenditem.call(this, o.edges);
				}
			}

			// generate interval links
			for (i = interval.start; i < interval.end; i++) {
				methods._appenditem.call(this, i);
			}

			// generate end edges
			if (interval.end < o.pages && o.edges > 0) {
				if (o.pages - o.edges > interval.end && (o.pages - o.edges - interval.end != 1)) {
					$panel.append('<li class="disabled"><span class="ellipse">' + o.ellipsetext + '</span></li>');
				} else if (o.pages - o.edges - interval.end == 1) {
					methods._appenditem.call(this, interval.end++);
				}
				var begin = math.max(o.pages - o.edges, interval.end);
				for (i = begin; i < o.pages; i++) {
					methods._appenditem.call(this, i);
				}
			}

			// generate next link
			if (o.nexttext) {
				methods._appenditem.call(this, o.currentpage + 1, {text: o.nexttext, classes: 'next'});
			}
			
			//增加  末页
			
			methods._appenditem.call(this, o.pages + 1, {text: "末页", classes: 'last'});
			
			//增加跳转页面
			/*var str_select="<select onchange='loaddata(pagenumber, perpage);' style='height:26px;'>";
			for(var p=1;p<=o.pages;p++)
			{
				str_select += "<option value='"+p+"' "+((o.currentpage+1)==p ?"selected":"")+">"+p+"</option>";
			}
			str_select+= "</select>";			
			
			$panel.append('<li><span>跳转：'+str_select+'页</span></li>');*/
			
			var o_select = $panel.find("select");
			var self = this;
			o_select.change(function(event){
					return methods._selectpage.call(self, $(this).val()-1, event);
			});
			/////////////增加跳转页面/////////////////////
		},

		_getpages: function(o) {
			var pages = math.ceil(o.items / o.itemsonpage);
			return pages || 1;
		},

		_getinterval: function(o) {
			return {
				start: math.ceil(o.currentpage > o.halfdisplayed ? math.max(math.min(o.currentpage - o.halfdisplayed, (o.pages - o.displayedpages)), 0) : 0),
				end: math.ceil(o.currentpage > o.halfdisplayed ? math.min(o.currentpage + o.halfdisplayed, o.pages) : math.min(o.displayedpages, o.pages))
			};
		},

		_appenditem: function(pageindex, opts) {
			var self = this, options, $link, o = self.data('pagination'), $linkwrapper = $('<li></li>'), $ul = self.find('ul');

			pageindex = pageindex < 0 ? 0 : (pageindex < o.pages ? pageindex : o.pages - 1);

			options = {
				text: pageindex + 1,
				classes: ''
			};

			if (o.labelmap.length && o.labelmap[pageindex]) {
				options.text = o.labelmap[pageindex];
			}

			options = $.extend(options, opts || {});

			if (pageindex == o.currentpage || o.disabled) {
				if (o.disabled) {
					$linkwrapper.addclass('disabled');
				} else {
					//$linkwrapper.addclass('active');
				}
				$link = $('<a class="currentpage"><span>' + (options.text) + '</span></a>');
			} else {
				$link = $('<a href="' + o.hreftextprefix + (pageindex + 1) + o.hreftextsuffix + '" class="page-link"><span>' + (options.text) + '</span></a>');
				$link.click(function(event){
					return methods._selectpage.call(self, pageindex, event);
				});
			}

			if (options.classes) {
				$link.addclass(options.classes);
				if(options.classes=="prev" || options.classes =="next" || options.classes=="first" || options.classes =="last")
				{
					$link.removeclass("currentpage");
				}
			}

			$linkwrapper.append($link);

			if ($ul.length) {
				$ul.append($linkwrapper);
			} else {
				self.append($linkwrapper);
			}
		},

		_selectpage: function(pageindex, event) {
			var o = this.data('pagination');
			o.currentpage = pageindex;
			if (o.selectonclick) {
				methods._draw.call(this);
			}
			return o.onpageclick(pageindex + 1, event);
		}

	};

	$.fn.pagination = function(method) {

		// method calling logic
		if (methods[method] && method.charat(0) != '_') {
			return methods[method].apply(this, array.prototype.slice.call(arguments, 1));
		} else if (typeof method === 'object' || !method) {
			return methods.init.apply(this, arguments);
		} else {
			$.error('method ' +  method + ' does not exist on jquery.pagination');
		}

	};

})(jquery);