(function($) {

	$.widget("ui.spinner", {
		init: function() {

			//Initialize needed constants
			var self = this;
			this.element.addClass("ui-spinner");
			this.element[0].value = this.options.start;
			
			var pickerHeight = this.element.innerHeight() / 2 - parseInt(this.element.css("borderTopWidth"),10) - 2;
			this.element
			.wrap("<div>")
			.parent()
				.css({
					position: this.element.css("position") == "static" ? "relative" : this.element.css("position"),
					left: this.element.css("left"),
					top: this.element.css("top"),
					width: this.element.outerWidth(),
					height: this.element.outerHeight()
				})
				.css("float", this.element.css("float"))
				.prepend('<div class="ui-spinner-up"></div>')
				.find("div.ui-spinner-up")
					.bind("mousedown", function() { if(!self.counter) self.counter = 1; self.mousedown(100, "up"); })
					.bind("mouseup", function(e) { self.counter = 0; if(self.timer) window.clearInterval(self.timer); self.element[0].focus(); self.propagate("change", e); })
					.css({ height: pickerHeight, top: parseInt(this.element.css("borderTopWidth"),10)+1, right: parseInt(this.element.css("borderRightWidth"),10)+1 })
				.end()
				.append('<div class="ui-spinner-down"></div>')
				.find("div.ui-spinner-down")
					.bind("mousedown", function() { if(!self.counter) self.counter = 1; self.mousedown(100, "down"); })
					.bind("mouseup", function(e) { self.counter = 0; if(self.timer) window.clearInterval(self.timer); self.element[0].focus(); self.propagate("change", e); })
					.css({ height: pickerHeight, bottom: parseInt(this.element.css("borderBottomWidth"),10)+1, right: parseInt(this.element.css("borderRightWidth"),10)+1 })
				.end()
			;
			
			this.element
			.bind("keydown.spinner", function(e) {
				if(!self.counter) self.counter = 1;
				self.keydown.call(self, e);
			})
			.bind("keyup.spinner", function(e) {
				self.counter = 0;
				self.cleanUp();
				self.propagate("change", e);
			})
			;

		},
		plugins: {},
		constrain: function() {
			if(this.options.min != undefined && this.element[0].value < this.options.min) this.element[0].value = this.options.min;
			if(this.options.max != undefined && this.element[0].value > this.options.max) this.element[0].value = this.options.max;
		},
		cleanUp: function() {
			this.element[0].value = this.element[0].value.replace(/[^0-9\-]/g, '');
			this.constrain();
		},
		down: function(e) {
			if(isNaN(parseInt(this.element[0].value,10))) this.element[0].value = this.options.start;
			this.element[0].value -= (this.options.incremental && this.counter > 100 ? (this.counter > 200 ? 100 : 10) : 1) * this.options.stepping;
			this.constrain();
			if(this.counter) this.counter++;
			this.propagate("spin", e);
		},
		up: function(e) {
			if(isNaN(parseInt(this.element[0].value,10))) this.element[0].value = this.options.start;
			this.element[0].value = parseFloat(this.element[0].value) + (this.options.incremental && this.counter > 100 ? (this.counter > 200 ? 100 : 10) : 1) * this.options.stepping;
			this.constrain();
			if(this.counter) this.counter++;
			this.propagate("spin", e);
		},
		mousedown: function(i, d) {
			var self = this;
			i = i || 100;
			if(this.timer) window.clearInterval(this.timer);
			this.timer = window.setInterval(function() {
				self[d]();
				if(self.counter > 20) self.mousedown(20, d);
			}, i);
		},
		keydown: function(e) {
			if(e.keyCode == 38 || e.keyCode == 39) this.up(e);
			if(e.keyCode == 40 || e.keyCode == 37) this.down(e);
			if(e.keyCode == 36) this.element[0].value = this.options.min || this.options.start; //Home key goes to min, if defined, else to start
			if(e.keyCode == 35 && this.options.max != undefined) this.element[0].value = this.options.max; //End key goes to maximum
		},
		ui: function(e) {
			return {
				instance: this,
				options: this.options,
				element: this.element				
			};
		},
		propagate: function(n,e) {
			$.ui.plugin.call(this, n, [e, this.ui()]);
			return this.element.triggerHandler(n == "spin" ? n : "spin"+n, [e, this.ui()], this.options[n]);
		},
		destroy: function() {
			if(!$.data(this.element[0], 'spinner')) return;
			this.element
				.removeClass("ui-spinner ui-spinner-disabled")
				.removeData("spinner")
				.unbind(".spinner");
		}
	});
	
	$.ui.spinner.defaults = {
		stepping: 1,
		start: 0,
		incremental: true
	};
	
})(jQuery);