/**
 *
 */
package org.gcube.portlets.widgets.ckancontentmoderator.client.ui;

import org.gcube.portlets.widgets.ckancontentmoderator.client.events.IFrameInstanciedEvent;
import org.gcube.portlets.widgets.ckancontentmoderator.client.resources.ContentModeratorWidgetResources;

import com.google.gwt.core.shared.GWT;
import com.google.gwt.dom.client.Style.Display;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.LoadEvent;
import com.google.gwt.event.dom.client.LoadHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Frame;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.NamedFrame;

// TODO: Auto-generated Javadoc
/**
 * The Class CkanFramePanel.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * Jun 9, 2016
 */
public class CkanFramePanel extends FlowPanel{

	private NamedFrame frame;
	//private static final String FRAME_NAME = "ckan-content-frame";
	private HandlerManager eventBus;
	private Image loading = new Image(ContentModeratorWidgetResources.ICONS.loading());
	private String messageToSend;
	private String iFrameRandomName;

	/**
	 * Instantiates a new ckan frame panel.
	 *
	 * @param eventBus the event bus
	 */
	public CkanFramePanel(HandlerManager eventBus) {
		this.eventBus = eventBus;
		addLoading();
	}

	/**
	 * Post message.
	 *
	 * @param msg the msg (as json)
	 * @param frameName the frame name
	 */
	protected native void sendMessage(String msg, String frameName) /*-{
		  console.log("Sending message " + msg);
		  // $wnd.parent.postMessage(msg,'*');
    	  //var f = $wnd.frames[frameName];
    	  //console.log(f);
		  //f.contentWindow.postMessage(msg, "*");
		  $wnd.frames[frameName].postMessage(msg,"*")
		  console.log("Message sent");
	}-*/;

	/**
	 * Prints the.
	 *
	 * @param msg the msg
	 */
	private static native void print(String msg)/*-{
	console.log(msg);
	}-*/;


	/**
	 * Instance frame.
	 *
	 * @param datasetURL the dataset URL
	 * @param messageToSend the message to send
	 * @return the frame
	 */
	public Frame instanceFrame(String datasetURL, final String messageToSend) {
		GWT.log("Instancing new IFRAME with uri: "+datasetURL);
		try{
			if(frame != null)
				remove(frame);
		}catch(Exception e){
			print("Error " + e);
		}

		addLoading();
		String urlEncoded = URL.encode(datasetURL);
		GWT.log("Encoded url for instanciating frame is " + urlEncoded);
		iFrameRandomName = Random.nextInt() + "dataset-iframe"+Random.nextInt();
		frame = new NamedFrame(iFrameRandomName);
		frame.setUrl(urlEncoded);

		frame.getElement().setId(iFrameRandomName);
		frame.setWidth("100%");
		frame.setHeight("500px");
		//		frame.setHeight("100%");
		//		frame.getElement().getStyle().setOverflow(Overflow.HIDDEN);
		//		frame.getElement().setAttribute("scrolling", "no");
		frame.getElement().getStyle().setBorderWidth(0, Unit.PX);
		frame.addLoadHandler(new LoadHandler() {

			@Override
			public void onLoad(LoadEvent arg0) {

				CkanFramePanel.this.remove(loading);
				if(messageToSend!=null)
					sendMessage(messageToSend, iFrameRandomName);

			}
		});
		add(frame);
		frame.setVisible(true);
		eventBus.fireEvent(new IFrameInstanciedEvent(frame));
		return frame;
	}

	/**
	 * Gets the frame.
	 *
	 * @return the frame
	 */
	public Frame getFrame() {
		return frame;
	}

	/**
	 * add loading image.
	 */
	private void addLoading(){
		this.add(loading);
		loading.getElement().getStyle().setProperty("margin", "auto");
		loading.getElement().getStyle().setDisplay(Display.BLOCK);
	}
}