/**
 * this jquery plugin displays pagination links inside the selected elements.
 *
 * @author gabriel birke (birke *at* d-scribe *dot* de)
 * @version 1.2
 * @param {int} maxentries number of entries to paginate
 * @param {object} opts several options (see readme for documentation)
 * @return {object} jquery object
 */
jquery.fn.pagination1 = function(maxentries, opts){
	opts = jquery.extend({
		items_per_page:10,
		num_display_entries:10,
		current_page:0,
		num_edge_entries:0,
		link_to:"#",
		prev_text:"prev",
		next_text:"next",
		ellipse_text:"...",
		prev_show_always:true,
		next_show_always:true,
		callback:function(){return false;}
	},opts||{});
	
	return this.each(function() {
		/**
		 * 鐠侊紕鐣婚張鈧径褍鍨庢い鍨▔缁€鐑樻殶閻╋拷
		 */
		function numpages() {
			return math.ceil(maxentries/opts.items_per_page);
		}	
		/**
		 * 閺嬩胶顏崚鍡涖€夐惃鍕崳婵鎷扮紒鎾存将閻愮櫢绱濇潻娆忓絿閸愬厖绨琧urrent_page 閸滐拷 num_display_entries.
		 * @鏉╂柨娲� {閺佹壆绮�(array)}
		 */
		function getinterval()  {
			var ne_half = math.ceil(opts.num_display_entries/2);
			var np = numpages();
			var upper_limit = np-opts.num_display_entries;
			var start = current_page>ne_half?math.max(math.min(current_page-ne_half, upper_limit), 0):0;
			var end = current_page>ne_half?math.min(current_page+ne_half, np):math.min(opts.num_display_entries, np);
			return [start,end];
		}
		
		/**
		 * 閸掑棝銆夐柧鐐复娴滃娆㈡径鍕倞閸戣姤鏆�
		 * @閸欏倹鏆� {int} page_id 娑撶儤鏌婃い鐢电垳
		 */
		function pageselected(page_id, evt){
			current_page = page_id;
			drawlinks();
			var continuepropagation = opts.callback(page_id, panel);
			if (!continuepropagation) {
				if (evt.stoppropagation) {
					evt.stoppropagation();
				}
				else {
					evt.cancelbubble = true;
				}
			}
			return continuepropagation;
		}
		
		/**
		 * 濮濄倕鍤遍弫鏉跨殺閸掑棝銆夐柧鐐复閹绘帒鍙嗛崚鏉款啇閸ｃ劌鍘撶槐鐘辫厬
		 */
		function drawlinks() {
			panel.empty();
			var interval = getinterval();
			var np = numpages();
			// 鏉╂瑤閲滄潏鍛и閸戣姤鏆熸潻鏂挎礀娑撯偓娑擃亜顦╅悶鍡楀毐閺佹媽鐨熼悽銊︽箒閻偓濮濓絿鈥榩age_id閻ㄥ埦ageselected閵嗭拷
			var getclickhandler = function(page_id) {
				return function(evt){ return pageselected(page_id,evt); }
			}
			//鏉堝懎濮崙鑺ユ殶閻劍娼垫禍褏鏁撴稉鈧稉顏勫礋闁剧偓甯�(婵″倹鐏夋稉宥嗘ц瑜版挸澧犳い闈涘灟娴溠呮晸span閺嶅洨顒�)
			var appenditem = function(page_id, appendopts){
				page_id = page_id<0?0:(page_id<np?page_id:np-1); // 鐟欏嫯瀵杙age id閸婏拷
				appendopts = jquery.extend({text:page_id+1, classes:""}, appendopts||{});
				if(page_id == current_page){
					var lnk = jquery("<span class='current'>"+(appendopts.text)+"</span>");
				}else{
					var lnk = jquery("<a>"+(appendopts.text)+"</a>")
						.bind("click", getclickhandler(page_id))
						.attr('href', opts.link_to.replace(/__id__/,page_id));		
				}
				if(appendopts.classes){lnk.addclass(appendopts.classes);}
				panel.append(lnk);
			}
			// 娴溠呮晸"previous"-闁剧偓甯�
			if(opts.prev_text && (current_page > 0 || opts.prev_show_always)){
				appenditem(current_page-1,{text:opts.prev_text, classes:"prev"});
			}
			// 娴溠呮晸鐠у嘲顫愰悙锟�
			if (interval[0] > 0 && opts.num_edge_entries > 0)
			{
				var end = math.min(opts.num_edge_entries, interval[0]);
				for(var i=0; i<end; i++) {
					appenditem(i);
				}
				if(opts.num_edge_entries < interval[0] && opts.ellipse_text)
				{
					jquery("<span>"+opts.ellipse_text+"</span>").appendto(panel);
				}
			}
			// 娴溠呮晸閸愬懘鍎撮惃鍕昂闁剧偓甯�
			for(var i=interval[0]; i<interval[1]; i++) {
				appenditem(i);
			}
			// 娴溠呮晸缂佹挻娼悙锟�
			if (interval[1] < np && opts.num_edge_entries > 0)
			{
				if(np-opts.num_edge_entries > interval[1]&& opts.ellipse_text)
				{
					jquery("<span>"+opts.ellipse_text+"</span>").appendto(panel);
				}
				var begin = math.max(np-opts.num_edge_entries, interval[1]);
				for(var i=begin; i<np; i++) {
					appenditem(i);
				}
				
			}
			// 娴溠呮晸 "next"-闁剧偓甯�
			if(opts.next_text && (current_page < np-1 || opts.next_show_always)){
				appenditem(current_page+1,{text:opts.next_text, classes:"next"});
			}
		}
		
		//娴犲酣鈧銆嶆稉顓熷絹閸欐溈urrent_page
		var current_page = opts.current_page;
		//閸掓稑缂撴稉鈧稉顏呮▔缁€鐑樻蒋閺佹澘鎷板в蹇涖€夐弰鍓с仛閺夆剝鏆熼崐锟�
		maxentries = (!maxentries || maxentries < 0)?1:maxentries;
		opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page;
		//鐎涙ê鍋岲om閸忓啰绀岄敍灞间簰閺傞€涚┒娴犲孩澧嶉張澶屾畱閸愬懘鍎寸紒鎾寸€稉顓″箯閸欙拷
		var panel = jquery(this);
		// 閼惧嘲绶遍梽鍕閸旂喕鍏橀惃鍕帗缁憋拷
		this.selectpage = function(page_id){ pageselected(page_id);}
		this.prevpage = function(){ 
			if (current_page > 0) {
				pageselected(current_page - 1);
				return true;
			}
			else {
				return false;
			}
		}
		this.nextpage = function(){ 
			if(current_page < numpages()-1) {
				pageselected(current_page+1);
				return true;
			}
			else {
				return false;
			}
		}
		// 閹碘偓閺堝鍨垫慨瀣鐎瑰本鍨氶敍宀€绮崚鍫曟懠閹猴拷
		drawlinks();
        // 閸ョ偠鐨熼崙鑺ユ殶
        opts.callback(current_page, this);
	});
}