"use strict";

//
//A dropdown menu.  Pass it a container and an array of data, and it will build the button, caret, and list of selectable elements inside the container.
//
(function($) {
	var Dropdown = function($element, data, options) {
		var _this = this;
		var textSpan = $("<span>" + options.defaultText + "</span>");

		this.$element = $element;
		this.options = $.extend({}, Dropdown.DEFAULTS, options);
		this.$selected = null;
		this.$textSpan = null;

		this.selectionHandler = function(event) {
			_this.$selected = $(this);
			_this.$selected.addClass(_this.options.selectionClass).siblings().removeClass(_this.options.selectionClass);
			textSpan.text(_this.$selected.text());
		};

		var button = $("<button class='" + this.options.buttonClasses + "' style='" + this.options.buttonStyling + "' type='button' data-toggle='dropdown'></button>");
		var caretSpan = $("<span class='" + this.options.caretClasses + "' style='margin-left: 8px;'></span>");

		button.appendTo($element);
		textSpan.appendTo(button);
		caretSpan.appendTo(button);
		//Save this for later use when setting the selection manually.
		this.$textSpan = textSpan;

		var ul = $("<ul class='dropdown-menu' role='menu'></ul>");
		ul.appendTo($element);

		for(var dataIndex = 0; dataIndex < data.length; dataIndex++) {
			var nextData = data[dataIndex];
			var text = $.isFunction(options.textAttr) ? options.textAttr(nextData) : nextData[options.textAttr];
			var li = $("<li role='presentation' class='" + this.options.listItemClasses + "'><a role='menuitem' href='javascript:;'>" + text + "</a></li>")

			li.appendTo(ul);
			li.data('object', nextData);
			li.bind("click", this.selectionHandler);
		}
	};
	
	Dropdown.DEFAULTS = {
		textAttr: 'name',  //The attribute of the data elements to use for the name.  This can also be a function that takes the data object and returns the text.
		defaultText: '',  //The initial text if no selection is made.  This will be taken from the
		selectionClass: '',  //The class to use for the selected element in the dropdown list.
		buttonStyling: '',
		buttonClasses: 'btn btn-default dropdown-toggle',
		caretClasses: 'caret',
		listItemClasses: ''
	};

	Dropdown.prototype.getSelection = Dropdown.prototype.getSelected = function() {
		return this.$selected.data('object');
	};

	Dropdown.prototype.setSelection = Dropdown.prototype.setSelected = function(object) {
		var listElements = this.$element.find("li");

		for(var index = 0; index < listElements.length; index++) {
			if($(listElements[index]).data('object').id == object.id) {
				this.$selected = $(listElements[index]);
				this.$selected.addClass(this.options.selectionClass).siblings().removeClass(this.options.selectionClass);
				this.$textSpan.text(this.$selected.text());
				break;
			}
		}
	};

	$.fn.buildDropdown = function(data, options) {
		for(var index = 0; index < this.length; index++) {
			var $next = $(this[index]);
			var nextDropdown = new Dropdown($next, data, options);

			$next.data("de.dropdown", nextDropdown);
		}
	}
	$.fn.getDropdown = function() {
		if(this.length > 0) {
			return $(this[0]).data('de.dropdown');
		}
	}
})(jQuery);