/*
 * jQuery UI Spinner
 *
 * Copyright (c) 2008 jQuery
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Spinner
 *
 * Depends:
 *  ui.core.js
 */
(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);
		})
		;
		if ($.fn.mousewheel) {
			this.element.mousewheel(function(e, delta) { self._mousewheel(e, delta); });
		}

	},
	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
	},
	_mousewheel: function(e, delta) {
		delta = ($.browser.opera ? -delta / Math.abs(delta) : delta);
		delta > 0 ? this._up(e) : this._down(e);
		e.preventDefault();
	},
	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");
		if ($.fn.mousewheel) {
			this.element.unmousewheel();
		}
	}
});

$.ui.spinner.defaults = {
	stepping: 1,
	start: 0,
	incremental: true
};

})(jQuery);