/*
 * Fuel UX Radio
 * https://github.com/ExactTarget/fuelux
 *
 * Copyright (c) 2012 ExactTarget
 * Licensed under the MIT license.
 */

define(['require','jquery'],function (require) {

	var $ = require('jquery');


	// RADIO CONSTRUCTOR AND PROTOTYPE

	var Radio = function (element, options) {
		this.$element = $(element);
		this.options = $.extend({}, $.fn.radio.defaults, options);

		// cache elements
		this.$label = this.$element.parent();
		this.$icon = this.$label.find('i');
		this.$radio = this.$label.find('input[type=radio]');
		this.groupName = this.$radio.attr('name');

		// set default state
		this.setState(this.$radio);

		// handle events
		this.$radio.on('change', $.proxy(this.itemchecked, this));
	};

	Radio.prototype = {

		constructor: Radio,

		setState: function ($radio, resetGroupState) {
			var checked = $radio.is(':checked');
			var disabled = $radio.is(':disabled');

			// set state of radio
			if (checked === true) {
				this.$icon.addClass('checked');
			}
			if (disabled === true) {
				this.$icon.addClass('disabled');
			}
		},

		resetGroup: function () {
			// reset all radio buttons in group
			$('input[name=' + this.groupName + ']').next().removeClass('checked');
		},

		enable: function () {
			this.$radio.attr('disabled', false);
			this.$icon.removeClass('disabled');
		},

		disable: function () {
			this.$radio.attr('disabled', true);
			this.$icon.addClass('disabled');
		},

		itemchecked: function (e) {
			var radio = $(e.target);

			this.resetGroup();
			this.setState(radio);
		}
	};


	// RADIO PLUGIN DEFINITION

	$.fn.radio = function (option, value) {
		var methodReturn;

		var $set = this.each(function () {
			var $this = $(this);
			var data = $this.data('radio');
			var options = typeof option === 'object' && option;

			if (!data) $this.data('radio', (data = new Radio(this, options)));
			if (typeof option === 'string') methodReturn = data[option](value);
		});

		return (methodReturn === undefined) ? $set : methodReturn;
	};

	$.fn.radio.defaults = {};

	$.fn.radio.Constructor = Radio;


	// RADIO DATA-API

	$(function () {
		$(window).on('load', function () {
			//$('i.radio').each(function () {
			$('.radio-custom > input[type=radio]').each(function () {
				var $this = $(this);
				if ($this.data('radio')) return;
				$this.radio($this.data());
			});
		});
	});

});