( function( $, window, document, undefined ) {

	"use strict";

		// undefined is used here as the undefined global variable in ecmascript 3 is
		// mutable (ie. it can be changed by someone else). undefined isn't really being
		// passed in so we can ensure the value of it is truly undefined. in es5, undefined
		// can no longer be modified.

		// window and document are passed through as local variables rather than global
		// as this (slightly) quickens the resolution process and can be more efficiently
		// minified (especially when both are regularly referenced in your plugin).

		// create the defaults once
		var pluginname = "easyslider",
			defaults = {
				slidespeed: 500,
				paginationspacing: "15px",
				paginationdiameter: "12px",
				paginationpositionfrombottom: "20px",
				controlsclass: ".controls",
				slidesclass: ".slides",
				paginationclass: ".pagination"
			};

		// the actual plugin constructor
		function plugin (element, options) {
			this.element = element;

			// jquery has an extend method which merges the contents of two or
			// more objects, storing the result in the first object. the first object
			// is generally empty as we don't want to alter the default options for
			// future instances of the plugin
			this.settings = $.extend({}, defaults, options);
			this._default = defaults;
			this._name = pluginname;
			this.init();
		}

		// avoid plugin.prototype conflicts
		$.extend( plugin.prototype, {
			init: function() {

				// place initialization logic here
				// you already have access to the dom element and
				// the options via the instance, e.g. this.element
				// and this.settings
				// you can add more functions like the one below and
				// call them like the example below
				this.setproperties();
				this.positionpagination();
				this.positioncontrols();
				this.slideparameters.setcurrentslidenumber.call(this, 1);
				this.events.clickright.call(this);
				this.events.clickleft.call(this);
				this.events.clickpage.call(this);
			},						
			events: {
				clickright: function() {
							var _this = this;
							$(this.settings.controlsclass+" "+"li:last-child").click(
								function() {
									if (_this.slideparameters.getcurrentslidenumber.call(_this) === _this.slideparameters.getnumberofslides.call(_this)) {
										//go to first slide, when slideshow has reached max distance
										$(_this.settings.slidesclass).animate({right: "0%"}, _this.settings.slidespeed);
										_this.slideparameters.setcurrentslidenumber.call(_this, 1);
										_this.paginate(_this.slideparameters.getcurrentslidenumber.call(_this));
									} else {
										//go to next slide
										$(_this.settings.slidesclass).animate({right: "+=100%"}, _this.settings.slidespeed);
										_this.slideparameters.setcurrentslidenumber.call(_this, _this.slideparameters.getcurrentslidenumber.call(_this)+1);
										_this.paginate(_this.slideparameters.getcurrentslidenumber.call(_this));
									}
								});
				},
				clickleft: 	function() {
							var _this = this;
							$(this.settings.controlsclass + " " + "li:first-child").click(	
								function() {
									if (_this.slideparameters.getcurrentslidenumber.call(_this) === 1) {
										//go to first slide, when slideshow has reached max distance
										$(_this.settings.slidesclass).animate({right: (_this.slideparameters.getmaxslidepercentage.call(_this)-100).tostring()+"%"}, _this.settings.slidespeed);
										_this.slideparameters.setcurrentslidenumber.call(_this, _this.slideparameters.getnumberofslides.call(_this));
										_this.paginate(_this.slideparameters.getcurrentslidenumber.call(_this));
									} else {
										//go to next slide
										$(_this.settings.slidesclass).animate({right: "-=100%"}, _this.settings.slidespeed);
										_this.slideparameters.setcurrentslidenumber.call(_this, _this.slideparameters.getcurrentslidenumber.call(_this)-1);
										_this.paginate(_this.slideparameters.getcurrentslidenumber.call(_this));
									}
								});
				},
				clickpage: function() {
							var _this = this;
							$(this.settings.paginationclass + " " + "li").click(
								function() {
									var currentslidenumber = $(this).index()+1;
									$(_this.settings.slidesclass).animate({right: ((currentslidenumber-1)*100).tostring()+"%"}, 500);
									_this.paginate(currentslidenumber);
								});
				}
			},
			paginate: function(currentslidenumber) {
				var i;
				var total = this.slideparameters.getnumberofslides.call(this);
				for (i=1; i<=total; i++) {
					$(this.settings.paginationclass + " " + "li:nth-child"+ "(" + i.tostring() + ")").removeclass("active");
				}
				$(this.settings.paginationclass + " " + "li:nth-child"+ "(" + currentslidenumber.tostring() + ")").addclass("active");
				this.slideparameters.setcurrentslidenumber.call(this, currentslidenumber);
			},
			positionpagination: function() {
				var numberofslides = this.slideparameters.getnumberofslides.call(this);
				var marginleft = -(numberofslides*(this.convertstringtointeger(this.settings.paginationdiameter)) + (numberofslides-1)*(this.convertstringtointeger(this.settings.paginationspacing)))/2;
				
				$(this.settings.paginationclass).css("margin-left", marginleft);
			},
			positioncontrols: function() {
				var heightdiff = (this.slideparameters.getsliderheight.call(this)-this.slideparameters.getslideheight.call(this))/2;
				var halfheightcontrol = $(this.settings.controlsclass + " " + "li").css("margin-top");
				
				$(this.settings.controlsclass + " " + "li").css("margin-top", ((this.convertstringtointeger(halfheightcontrol))-heightdiff)+"px");
			},
			slideparameters: {
				setcurrentslidenumber: function(currentslidenumber) {
					this.currentslidenumber = currentslidenumber;
				},
				getcurrentslidenumber: function() {
					return this.currentslidenumber;
				},
				getnumberofslides: function() {
					return $(this.settings.slidesclass).children().length;
				},
				getslidewidth: function() {
					return $(this.settings.slidesclass + " " + "li").width();
				},
				getslideheight: function() {
					return $(this.settings.slidesclass + " " + "li").height();
				},
				getsliderheight: function() {
					return $(this.element).height();
				},
				getmaxslidepercentage: function() {
					return this.slideparameters.getnumberofslides.call(this)*100;
				},
			},
			convertstringtointeger: function(string) {
				return parseint(string);
			},
			setproperties: function() {
				$("#slider").css({
					"position": "relative",
					"overflow": "hidden"
					});
				$(this.settings.slidesclass).css({
					"position": "relative",
					"width": this.slideparameters.getmaxslidepercentage.call(this).tostring()+"%"
					});
				$(this.settings.controlsclass).css({
					"cursor": "pointer"
					});
				$(this.settings.controlsclass+" "+"li").css({
					"position": "absolute"
					});
				$(this.settings.slidesclass+" "+"li").css({
					"width": 100/this.slideparameters.getnumberofslides.call(this).tostring()+"%",
					"float": "left"
					});
				$(this.settings.paginationclass).css({
					"position": "relative",
					"left": "50%",
					"bottom": this.settings.paginationpositionfrombottom,
					"margin": 0
					});
				$(this.settings.paginationclass+" "+"li").css({
					"margin-right": this.settings.paginationspacing,
					"float": "left",
					"cursor": "pointer",
					"width": this.settings.paginationdiameter,
					"height": this.settings.paginationdiameter,
					"border-radius": "9999px"
					});
			}
		});

		// a really lightweight plugin wrapper around the constructor,
		// preventing against multiple instantiations
		$.fn[ pluginname ] = function( options ) {
			return this.each( function() {
				if ( !$.data( this, "plugin_" + pluginname ) ) {
					$.data( this, "plugin_" +
						pluginname, new plugin( this, options ) );
				}
			} );
		};

} )( jquery, window, document );