/**
 * $URL: https://source.sakaiproject.org/svn/sitestats/trunk/sitestats-tool/src/java/org/sakaiproject/sitestats/tool/wicket/pages/MaximizedImagePage.java $
 * $Id: MaximizedImagePage.java 105078 2012-02-24 23:00:38Z ottenhoff@longsight.com $
 *
 * Copyright (c) 2006-2009 The Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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 org.sakaiproject.sitestats.tool.wicket.pages;

import org.apache.wicket.Page;
import org.apache.wicket.Resource;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.markup.html.form.Button;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.image.NonCachingImage;
import org.apache.wicket.markup.html.image.resource.DynamicImageResource;
import org.apache.wicket.protocol.http.WebResponse;
import org.sakaiproject.sitestats.tool.facade.Locator;

/**
 * @author Nuno Fernandes
 */
public abstract class MaximizedImagePage extends BasePage {
	private static final long		serialVersionUID	= 1L;
	
	private Page					returnPage;
	private Class					returnClass;
	
	
	public MaximizedImagePage() {
		init(null, null);
	}
	
	public MaximizedImagePage(final Page returnPage, final Class returnClass) {
		init(returnPage, returnClass);
	}
	
	private void init(final Page returnPage, final Class returnClass) {
		String siteId = Locator.getFacade().getToolManager().getCurrentPlacement().getContext();
		boolean allowed = Locator.getFacade().getStatsAuthz().isUserAbleToViewSiteStats(siteId);
		if(allowed) {
			this.returnPage = returnPage;
			this.returnClass = returnClass;
			renderBody();
		}else{
			redirectToInterceptPage(new NotAuthorizedPage());
		}
	}

	@Override
	public void renderHead(IHeaderResponse response) {
		super.renderHead(response);
		response.renderJavascriptReference(JQUERYSCRIPT);
		response.renderOnDomReadyJavascript("setMainFrameHeightNoScroll(window.name, 750);");
	}
	
	public abstract byte[] getMaximizedImageData();
	
	@SuppressWarnings("serial")
	private void renderBody() {
		NonCachingImage image = new NonCachingImage("image") {
			@SuppressWarnings("serial")
			@Override
			protected Resource getImageResource() {
				return new DynamicImageResource() {

					@Override
					protected byte[] getImageData() {
						return getMaximizedImageData();
					}

					@Override
					protected void setHeaders(WebResponse response) {
						response.setHeader("Pragma", "no-cache");
						response.setHeader("Cache-Control", "no-cache");
						response.setDateHeader("Expires", 0);
						response.setContentType("image/png");
						response.setContentLength(getImageData().length);
						response.setAjax(true);
					}
				}.setCacheable(false);
			}
		};
		add(image);
		
		Form form = new Form("form");
		add(form);
		
		Button back = new Button("back") {
			@Override
			public void onSubmit() {
				if(returnPage != null) {
					setResponsePage(returnPage);
				}else if(returnClass != null) {
					setResponsePage(returnClass);
				}
				super.onSubmit();
			}
		};
		back.setDefaultFormProcessing(true);
		form.add(back);
	}
}