var EXPO = EXPO || {}; //isolated namespace
if (EXPO.about) {
	console.warn('WARNING: EXPO.about is already defined!');
} else {
	EXPO.about = (function () {
		/**
		 * private (visible inside this module only) variables
		 */
		/**
 		 * @type {Object} - module API interafce realization
		 */
		var that = {};
		/**
		 * @type {Object} default setting
		 */
		that.opt = {};
		/**
		 * dependencies.Place where you can switch on dependencies for module
		 * @type {EXPO.common|*} - mostly used in project functions and data (block.common.js)
		 */
		var com = EXPO.common;

		/**
		 * tabs object constructor
		 * @param options - options (id's and classes to specifie HTML elements)
		 * @constructor
		 */
		var Tabs = function (options) {
			this.opt = options;
			var self = this,
				opt = this.opt,
				tabClass = opt.tabClass,
				activeClass = opt.activeClass;
			/**
			 * tabs navigation menu
			 * @type {*|jQuery|HTMLElement}
			 * @public
			 */
			this.$tabsList = $('#'+opt.listId);
			/**
			 * tabs body container
			 * @type {*|jQuery|HTMLElement}
			 * @public
			 */
			this.$tabs = $('#'+opt.tabsId);
			/**
			 * short peview for content of each tabs
			 * @type {*|jQuery|HTMLElement}
			 * @public
			 */
			this.$tabsOpenings = $('#'+opt.tabsOpeningId);

			$('a',this.$tabsList).on('click', function () {
				$(this).parent('li').addClass(activeClass).siblings().removeClass(activeClass);
					var tabId = $(this).attr('href');
				tabId = tabId.replace('#','');
				self.setActive(tabId);
				return false;
			});


		};
		Tabs.prototype = {
			/**
			 * make specified tab visible
			 * @param tabId - tab DOM id pararmeter
			 * @public
			 */
			setActive: function (tabId) {
				var activeClass = this.opt.activeClass,
					tabClass = this.opt.tabClass,
					postfix = this.opt.postfix;
				this.$tabs.children('.'+tabClass).hide().removeClass(activeClass);
				this.$tabs.children('#'+tabId).fadeIn(function () {
					$(this).addClass(activeClass)
				});
				this.$tabsOpenings.children('.'+tabClass).removeClass(activeClass);
				this.$tabsOpenings.children('#'+tabId+postfix).addClass(activeClass);

			}
		};
		/**
		 * current module general initialization
		 * @param {Object} options - options recieved from web page view
		 */
		that.init = function (options) {
			// settings extending
			$.extend(this.opt, options);
			// begin of initialization
			var self = this;
			this.tabs = new Tabs(this.opt.tabs);

		};
		return that;
	}());
}