/**
 * Copyright 2008-2016 Qualogy Solutions B.V.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.qualogy.qafe.gwt.client.ui.renderer;

import org.gwt.mosaic.core.client.DOM;

import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.PushButton;
import com.google.gwt.user.client.ui.UIObject;
import com.qualogy.qafe.gwt.client.vo.ui.ButtonGVO;
import com.qualogy.qafe.gwt.client.vo.ui.ComponentGVO;
import com.qualogy.qafe.gwt.client.vo.ui.MenuItemGVO;

public class ButtonRenderer extends AbstractComponentRenderer {

	public UIObject render(ComponentGVO component, String uuid, String parent, String context) {
		UIObject uiObject = null;
		if (component != null && component instanceof ButtonGVO) {
			ButtonGVO buttonGVO = (ButtonGVO) component;
			if(buttonGVO.getImageLocation() != null){
				uiObject = createPushButton(buttonGVO.getMenu(), buttonGVO, uuid, parent, context);
			} else {
				uiObject = createButton(buttonGVO.getMenu(), buttonGVO, uuid, parent, context);
			}
		}
		return uiObject;
	}
	

	/**
	 * Creates PushButton component with image.
	 * Also associated context menu is specified.
	 * @param menu
	 * @param buttonGVO
	 * @param uuid
	 * @param parent
	 * @param context
	 * @return
	 */
	private PushButton createPushButton(MenuItemGVO menu, final ButtonGVO buttonGVO, final String uuid, final String parent, String context) {
		PushButton pushButton = null;
		if (menu != null) {
			pushButton =  new PushButton() {
				@Override
				public void onBrowserEvent(Event event) {
					if (event.getTypeInt() == Event.ONCONTEXTMENU) {
						DOM.eventPreventDefault(event);
						applyContextMenu(event, buttonGVO, uuid, parent);
					}
					super.onBrowserEvent(event);
				}

				@Override
				protected void setElement(Element elem) {
					super.setElement(elem);
					sinkEvents(Event.ONCONTEXTMENU);
				}
			};
		} else {
			pushButton =  new PushButton();
		}
		RendererHelper.fillIn(buttonGVO, pushButton, uuid, parent, context);
		/**
		 * Following code manages width and height of pushbutton holding image.
		 * Style attribute from the uiObject rendered as div is taken off.
		 * In case of PushButton the uiObject is rendered as a div which holds html element of type text and image.
		 * All styles are made in effect on the image. The text input remains empty.
		 * Width & Height mentioned in style attribute of push button tag has higher priority followed value of width & height attributes available in button tag 
		 * and the least priority goes to the properties mentioned in css style class.
		 * If width and height is not mentioned at all by any means then size of the image is made effective as size of the push button.
		 * */
		pushButton.getElement().removeAttribute("style");
		Image image = new Image(buttonGVO.getImageLocation());
		String imageHeight = buttonGVO.getHeight() == null ? image.getHeight()+"" : buttonGVO.getHeight();
		String imageWidth = buttonGVO.getWidth() == null ? image.getWidth()+"" : buttonGVO.getWidth();
		image.setSize(imageWidth,imageHeight);
		pushButton.setSize(imageWidth,imageHeight);
		if(buttonGVO.getStyleClass() != null){
			image.setStylePrimaryName(buttonGVO.getStyleClass());
		} 
		if(buttonGVO.getStyleProperties().length > 0) {
			RendererHelper.setStyleForElement(image.getElement(), buttonGVO.getStyleProperties());
		}
		pushButton.getUpFace().setImage(image);
		pushButton.getDownFace().setImage(image);
		return pushButton;
	}
	

	/**
	 * Creates Button component with a label.
	 * Also associated context menu is specified.
	 * @param menu
	 * @param buttonGVO
	 * @param uuid
	 * @param parent
	 * @param context
	 * @return
	 */
	private Button createButton(MenuItemGVO menu, final ButtonGVO buttonGVO, final String uuid, final String parent, String context) {
		Button button = null;
		if (menu != null) {
			button =  new Button() {
				@Override
				public void onBrowserEvent(Event event) {
					if (event.getTypeInt() == Event.ONCONTEXTMENU) {
						DOM.eventPreventDefault(event);
						applyContextMenu(event, buttonGVO, uuid, parent);
					}
					super.onBrowserEvent(event);
				}

				@Override
				protected void setElement(Element elem) {
					super.setElement(elem);
					sinkEvents(Event.ONCONTEXTMENU);
				}
			};
		} else {
			button = new Button();
		}
		RendererHelper.fillIn(buttonGVO, button, uuid, parent, context);
		
		button.setText(buttonGVO.getLabel());
		return button;
	}
}