/**
 * Button.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class is used to create buttons. You can create them directly or through the Factory.
 *
 * @example
 * // Create and render a button to the body element
 * tinymce.ui.Factory.create({
 *     type: 'button',
 *     text: 'My button'
 * }).renderTo(document.body);
 *
 * @-x-less Button.less
 * @class tinymce.ui.Button
 * @extends tinymce.ui.Widget
 */
define("tinymce/ui/Button", [
	"tinymce/ui/Widget"
], function(Widget) {
	"use strict";

	return Widget.extend({
		Defaults: {
			classes: "widget btn",
			role: "button"
		},

		/**
		 * Constructs a new button instance with the specified settings.
		 *
		 * @constructor
		 * @param {Object} settings Name/value object with settings.
		 * @setting {String} size Size of the button small|medium|large.
		 * @setting {String} image Image to use for icon.
		 * @setting {String} icon Icon to use for button.
		 */
		init: function(settings) {
			var self = this, size;

			self._super(settings);
			settings = self.settings;

			size = self.settings.size;

			self.on('click mousedown', function(e) {
				e.preventDefault();
			});

			self.on('touchstart', function(e) {
				self.fire('click', e);
				e.preventDefault();
			});

			if (settings.subtype) {
				self.classes.add(settings.subtype);
			}

			if (size) {
				self.classes.add('btn-' + size);
			}

			if (settings.icon) {
				self.icon(settings.icon);
			}
		},

		/**
		 * Sets/gets the current button icon.
		 *
		 * @method icon
		 * @param {String} [icon] New icon identifier.
		 * @return {String|tinymce.ui.MenuButton} Current icon or current MenuButton instance.
		 */
		icon: function(icon) {
			if (!arguments.length) {
				return this.state.get('icon');
			}

			this.state.set('icon', icon);

			return this;
		},

		/**
		 * Repaints the button for example after it's been resizes by a layout engine.
		 *
		 * @method repaint
		 */
		repaint: function() {
			var btnElm = this.getEl().firstChild,
				btnStyle;

			if (btnElm) {
				btnStyle = btnElm.style;
				btnStyle.width = btnStyle.height = "100%";
			}

			this._super();
		},

		/**
		 * Renders the control as a HTML string.
		 *
		 * @method renderHtml
		 * @return {String} HTML representing the control.
		 */
		renderHtml: function() {
			var self = this, id = self._id, prefix = self.classPrefix;
			var icon = self.state.get('icon'), image, text = self.state.get('text'), textHtml = '';

			image = self.settings.image;
			if (image) {
				icon = 'none';

				// Support for [high dpi, low dpi] image sources
				if (typeof image != "string") {
					image = window.getSelection ? image[0] : image[1];
				}

				image = ' style="background-image: url(\'' + image + '\')"';
			} else {
				image = '';
			}

			if (text) {
				self.classes.add('btn-has-text');
				textHtml = '<span class="' + prefix + 'txt">' + self.encode(text) + '</span>';
			}

			icon = icon ? prefix + 'ico ' + prefix + 'i-' + icon : '';

			return (
				'<div id="' + id + '" class="' + self.classes + '" tabindex="-1" aria-labelledby="' + id + '">' +
					'<button role="presentation" type="button" tabindex="-1">' +
						(icon ? '<i class="' + icon + '"' + image + '></i>' : '') +
						textHtml +
					'</button>' +
				'</div>'
			);
		},

		bindStates: function() {
			var self = this, $ = self.$, textCls = self.classPrefix + 'txt';

			function setButtonText(text) {
				var $span = $('span.' + textCls, self.getEl());

				if (text) {
					if (!$span[0]) {
						$('button:first', self.getEl()).append('<span class="' + textCls + '"></span>');
						$span = $('span.' + textCls, self.getEl());
					}

					$span.html(self.encode(text));
				} else {
					$span.remove();
				}

				self.classes.toggle('btn-has-text', !!text);
			}

			self.state.on('change:text', function(e) {
				setButtonText(e.value);
			});

			self.state.on('change:icon', function(e) {
				var icon = e.value, prefix = self.classPrefix;

				self.settings.icon = icon;
				icon = icon ? prefix + 'ico ' + prefix + 'i-' + self.settings.icon : '';

				var btnElm = self.getEl().firstChild, iconElm = btnElm.getElementsByTagName('i')[0];

				if (icon) {
					if (!iconElm || iconElm != btnElm.firstChild) {
						iconElm = document.createElement('i');
						btnElm.insertBefore(iconElm, btnElm.firstChild);
					}

					iconElm.className = icon;
				} else if (iconElm) {
					btnElm.removeChild(iconElm);
				}

				setButtonText(self.state.get('text'));
			});

			return self._super();
		}
	});
});
