/*--------------------------------------------------------------------------
    *  Copyright 2007 utgenome.org
    *
    *  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.
   *--------------------------------------------------------------------------*/
  //--------------------------------------
  // UTGBMedaka Project
  //
  // ViewLoaderTrack.java
  // Since: Aug 13, 2007
  //
  // $URL$ 
  // $Author$
  //--------------------------------------
  package org.utgenome.gwt.utgb.client.track.lib;
  
  import org.utgenome.gwt.utgb.client.UTGBClientException;
  import org.utgenome.gwt.utgb.client.UTGBEntryPointBase;
  import org.utgenome.gwt.utgb.client.track.Track;
  import org.utgenome.gwt.utgb.client.track.TrackBase;
  import org.utgenome.gwt.utgb.client.track.TrackGroup;
  import org.utgenome.gwt.utgb.client.ui.FormLabel;
  import org.utgenome.gwt.utgb.client.view.TrackView;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.event.dom.client.ClickEvent;
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.event.dom.client.KeyCodes;
  import com.google.gwt.event.dom.client.KeyPressEvent;
  import com.google.gwt.event.dom.client.KeyPressHandler;
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.rpc.AsyncCallback;
  import com.google.gwt.user.client.ui.Button;
  import com.google.gwt.user.client.ui.DialogBox;
  import com.google.gwt.user.client.ui.FileUpload;
  import com.google.gwt.user.client.ui.FormPanel;
  import com.google.gwt.user.client.ui.HorizontalPanel;
  import com.google.gwt.user.client.ui.TextBox;
  import com.google.gwt.user.client.ui.VerticalPanel;
  import com.google.gwt.user.client.ui.Widget;
  import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
  import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;
  
  /**
   * Track for loading view files in Silk format.
   * 
   * @author leo
   * 
   */
  public class ViewLoaderTrack extends TrackBase {
  	public static TrackFactory factory() {
  		return new TrackFactory() {
  			public Track newInstance() {
  				return new ViewLoaderTrack();
  			}
  		};
  	}
  
  	VerticalPanel panel = new VerticalPanel();
  	TextBox urlBox = new TextBox();
  
  	public ViewLoaderTrack() {
  		super("View Loader");
  		// load view via HTTP
  		HorizontalPanel hp = new HorizontalPanel();
  		hp.setVerticalAlignment(HorizontalPanel.ALIGN_MIDDLE);
  		hp.add(new FormLabel("View Silk URL: "));
  		urlBox.setWidth("400px");
  		urlBox.addKeyPressHandler(new KeyPressHandler() {
  			public void onKeyPress(KeyPressEvent e) {
  				if (e.getCharCode() == KeyCodes.KEY_ENTER) {
  					downloadView(urlBox.getText());
  				}
  			}
  		});
  		Button loadButton = new Button("load");
  		loadButton.addClickHandler(new ClickHandler() {
  			public void onClick(ClickEvent e) {
  				downloadView(urlBox.getText());
  			}
  		});
  		hp.add(urlBox);
  		hp.add(loadButton);
  		// load view from a file
  		final FormPanel fileUploadForm = new FormPanel();
  		fileUploadForm.setAction(GWT.getModuleBaseURL() + "utgb-core/loadview");
  		fileUploadForm.setEncoding(FormPanel.ENCODING_MULTIPART);
  		fileUploadForm.setMethod(FormPanel.METHOD_POST);
  		HorizontalPanel formButtonPanel = new HorizontalPanel();
 		FileUpload fileBox = new FileUpload();
 		fileBox.setName("file");
 		fileBox.setWidth("300px");
 		Button uploadButton = new Button("submit");
 		uploadButton.addClickHandler(new ClickHandler() {
 
 			public void onClick(ClickEvent e) {
 				fileUploadForm.submit();
 			}
 		});
 		formButtonPanel.add(new FormLabel("View Silk File:"));
 		formButtonPanel.add(fileBox);
 		formButtonPanel.add(uploadButton);
 		fileUploadForm.add(formButtonPanel);
 		DOM.setStyleAttribute(fileUploadForm.getElement(), "margin", "0");
 		fileUploadForm.addSubmitCompleteHandler(new SubmitCompleteHandler() {
 			public void onSubmitComplete(SubmitCompleteEvent e) {
 
 				getFrame().setNowLoading();
 				String viewXML = extractEmbeddedSilkInComment(e.getResults());
 				setViewSilk(viewXML);
 			}
 		});
 		// set panes
 		panel.setStyleName("toolbox");
 		panel.add(hp);
 		panel.add(fileUploadForm);
 	}
 
 	private static String extractEmbeddedSilkInComment(String html) {
 		html = html.replaceFirst("<!--", "");
 		html = html.replaceFirst("-->", "");
 		return html;
 	}
 
 	private void downloadView(final String url) {
 		getFrame().setNowLoading();
 		getBrowserService().getHTTPContent(url, new AsyncCallback<String>() {
 			public void onFailure(Throwable caught) {
 				GWT.log("failed to load " + url, caught);
 				getFrame().loadingDone();
 			}
 
 			public void onSuccess(String viewXML) {
 
 				setViewSilk(viewXML);
 				getFrame().loadingDone();
 			}
 		});
 	}
 
 	private void setViewSilk(String viewSilk) {
 		if (viewSilk == null)
 			return;
 
 		UTGBEntryPointBase.showLoadingMessage();
 		getBrowserService().createTrackView(viewSilk, new AsyncCallback<TrackView>() {
 			public void onFailure(Throwable e) {
 				GWT.log(e.getMessage(), e);
 				DialogBox dialog = new DialogBox();
 				dialog.setText(e.getMessage());
 				dialog.show();
 				UTGBEntryPointBase.hideLoadingMessage();
 			}
 
 			public void onSuccess(TrackView v) {
 				TrackGroup newGroup;
 				try {
 					newGroup = TrackGroup.createTrackGroup(v);
 					TrackGroup rootTrackGroup = getTrackGroup().getRootTrackGroup();
 					rootTrackGroup.clear();
 					rootTrackGroup.addTrackGroup(newGroup);
 				}
 				catch (UTGBClientException e) {
 					GWT.log(e.getMessage(), e);
 					DialogBox dialog = new DialogBox();
 					dialog.setText(e.getMessage());
 					dialog.show();
 				}
 
 				UTGBEntryPointBase.hideLoadingMessage();
 			}
 		});
 
 	}
 
 	public Widget getWidget() {
 		return panel;
 	}
 }