/*
 * Copyright 2011 Corpuslinguistic working group Humboldt University Berlin.
 *
 * 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 annis.gui;

import annis.libgui.IDGenerator;
import com.vaadin.server.ExternalResource;
import com.vaadin.shared.ui.MarginInfo;
import com.vaadin.shared.ui.label.ContentMode;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Link;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A window displaying an invitation to participate in the development of ANNIS.
 *
 * @author Thomas Krause <krauseto@hu-berlin.de>
 */
public class HelpUsWindow extends Window
{

  private static final Logger log = LoggerFactory.getLogger(HelpUsWindow.class);

  private VerticalLayout layout;

  private final Button btClose;
  
  public HelpUsWindow()
  {
    setSizeFull();
    layout = new VerticalLayout();
    setContent(layout);

    layout.setSizeFull();
    layout.setMargin(new MarginInfo(false, false, true, false));

    HorizontalLayout hLayout = new HorizontalLayout();
    hLayout.setSizeFull();
    hLayout.setMargin(false);

    VerticalLayout labelLayout = new VerticalLayout();
    labelLayout.setMargin(true);
    labelLayout.setSizeFull();

    Label lblOpenSource = new Label();

    lblOpenSource.setValue(
      "<h1>ANNIS is <a href=\"http://opensource.org/osd\">Open Source</a> "
      + "software.</h1>"
      + "<p>This means you are free to download the source code and add new "
      + "features or make other adjustments to ANNIS on your own.<p/>"
      + "Here are some examples how you can help ANNIS:"
      + "<ul>"
      + "<li>Fix or report problems (bugs) you encounter when using the ANNIS software.</li>"
      + "<li>Add new features.</li>"
      + "<li>Enhance the documentation</li>"
      + "</ul>"
      + "<p>Feel free to visit our GitHub page for more information: <a href=\"https://github.com/korpling/ANNIS\" target=\"_blank\">https://github.com/korpling/ANNIS</a></p>");
    lblOpenSource.setContentMode(ContentMode.HTML);
    lblOpenSource.setStyleName("opensource");
    lblOpenSource.setWidth("100%");
    lblOpenSource.setHeight("-1px");
    labelLayout.addComponent(lblOpenSource);

    Link lnkFork = new Link();
    lnkFork.setResource(
      new ExternalResource("https://github.com/korpling/ANNIS"));
    lnkFork.setIcon(new ExternalResource(
      "https://s3.amazonaws.com/github/ribbons/forkme_right_red_aa0000.png"));
    lnkFork.setTargetName("_blank");

    hLayout.addComponent(labelLayout);
    hLayout.addComponent(lnkFork);
    hLayout.setComponentAlignment(labelLayout, Alignment.TOP_LEFT);
    hLayout.setComponentAlignment(lnkFork, Alignment.TOP_RIGHT);
    hLayout.setExpandRatio(labelLayout, 1.0f);

    layout.addComponent(hLayout);

    final HelpUsWindow finalThis = this;

    btClose = new Button("Close");
    btClose.addClickListener(new OkClickListener(finalThis));
    layout.addComponent(btClose);

    layout.setComponentAlignment(hLayout, Alignment.MIDDLE_CENTER);
    layout.setComponentAlignment(btClose, Alignment.MIDDLE_CENTER);
    layout.setExpandRatio(hLayout, 1.0f);
  }

  @Override
  public void attach()
  {
    super.attach();
    IDGenerator.assignIDForFields(HelpUsWindow.this, btClose);
  }
  
  

  private static class OkClickListener implements Button.ClickListener
  {

    private final HelpUsWindow finalThis;

    public OkClickListener(HelpUsWindow finalThis)
    {
      this.finalThis = finalThis;
    }

    @Override
    public void buttonClick(ClickEvent event)
    {
      UI.getCurrent().removeWindow(finalThis);
    }
  }
}