/**
 *
 */
package org.gcube.portlets.gcubeckan.gcubeckandatacatalog.client.view;

import org.gcube.portlets.gcubeckan.gcubeckandatacatalog.client.GCubeCkanDataCatalog;
import org.gcube.portlets.gcubeckan.gcubeckandatacatalog.client.event.IFrameInstanciedEvent;
import org.gcube.portlets.gcubeckan.gcubeckandatacatalog.client.resource.CkanPortletResources;

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.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;

/**
 * The Class CkanFramePanel.
 *
 * @author Francesco Mangiacrapa at ISTI-CNR francesco.mangiacrapa@isti.cnr.it
 * 
 *         Feb 25, 2022
 */
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(CkanPortletResources.ICONS.loading());
	private String messageToSend;

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

		addLoading();
		String urlEncoded = URL.encode(ckanUrlConnector);
		GWT.log("Encoded url for instanciating frame is " + urlEncoded);

		frame = new NamedFrame(GCubeCkanDataCatalog.GCUBE_CKAN_IFRAME);
		frame.setUrl(urlEncoded);

		frame.getElement().setId(GCubeCkanDataCatalog.GCUBE_CKAN_IFRAME);
		frame.setWidth("100%");
		// 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);
				sendMessage(messageToSend, GCubeCkanDataCatalog.GCUBE_CKAN_IFRAME);

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