/*
 * 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.VersionInfo;
import annis.libgui.IDGenerator;
import com.vaadin.server.ExternalResource;
import com.vaadin.server.ThemeResource;
import com.vaadin.server.VaadinService;
import com.vaadin.shared.Version;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Embedded;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Link;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.WildcardFileFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Thomas Krause <krauseto@hu-berlin.de>
 */
public class AboutWindow extends Window
{
  
  private static final Logger log = LoggerFactory.getLogger(AboutWindow.class);
    
  private VerticalLayout layout;
  
  private Button btClose;
  
  public AboutWindow()
  {
    setSizeFull();
    
    layout = new VerticalLayout();
    setContent(layout);
    layout.setSizeFull();
    layout.setMargin(true);
 
    HorizontalLayout hLayout = new HorizontalLayout();
    
    Embedded logoAnnis = new Embedded();
    logoAnnis.setSource(new ThemeResource("images/annis-logo-128.png"));
    logoAnnis.setType(Embedded.TYPE_IMAGE);    
    hLayout.addComponent(logoAnnis);
    
    Embedded logoSfb = new Embedded();
    logoSfb.setSource(new ThemeResource("images/sfb-logo.jpg"));
    logoSfb.setType(Embedded.TYPE_IMAGE);    
    hLayout.addComponent(logoSfb);
    
    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(lnkFork);
    
    hLayout.setComponentAlignment(logoAnnis, Alignment.MIDDLE_LEFT);
    hLayout.setComponentAlignment(logoSfb, Alignment.MIDDLE_RIGHT);
    hLayout.setComponentAlignment(lnkFork, Alignment.TOP_RIGHT);
    
    layout.addComponent(hLayout);
    
    layout.addComponent(new Label("ANNIS is a project of the "
      + "<a href=\"http://www.sfb632.uni-potsdam.de/\">SFB632</a>.", Label.CONTENT_XHTML));
    layout.addComponent(new Label("Homepage: "
      + "<a href=\"http://corpus-tools.org/annis/\">"
      + "http://corpus-tools.org/annis/</a>.", Label.CONTENT_XHTML));
    layout.addComponent(new Label("Version: " + VersionInfo.getVersion()));
    layout.addComponent(new Label("Vaadin-Version: " + Version.getFullVersion()));
    
    TextArea txtThirdParty = new TextArea();
    txtThirdParty.setSizeFull();
    
    
    StringBuilder sb = new StringBuilder();
    
    sb.append("The ANNIS team wants to thank these third party software that "
      + "made the ANNIS GUI possible:\n");
    
    File thirdPartyFolder = 
      new File(VaadinService.getCurrent().getBaseDirectory(), "THIRD-PARTY");
    if(thirdPartyFolder.isDirectory())
    {
      for(File c : thirdPartyFolder.listFiles((FileFilter) new WildcardFileFilter("*.txt")))
      {
        if(c.isFile())
        {
          try
          {
            sb.append(FileUtils.readFileToString(c)).append("\n");
          }
          catch (IOException ex)
          {
            log.error("Could not read file", ex);
          }
        }
      }
    }
    
    txtThirdParty.setValue(sb.toString());
    txtThirdParty.setReadOnly(true);
    txtThirdParty.addStyleName("shared-text");
    txtThirdParty.setWordwrap(false);
    
    layout.addComponent(txtThirdParty);
    
    btClose = new Button("Close");
    final AboutWindow finalThis = this;
    btClose.addClickListener(new OkClickListener(finalThis));
    layout.addComponent(btClose);
    
    layout.setComponentAlignment(hLayout, Alignment.MIDDLE_CENTER);
    layout.setComponentAlignment(btClose, Alignment.MIDDLE_CENTER);
    layout.setExpandRatio(txtThirdParty, 1.0f);
    
  }

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

  private static class OkClickListener implements Button.ClickListener
  {

    private final AboutWindow finalThis;

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

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