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/*
 * Copyright 2013 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.visualizers.component.rst;

import annis.gui.components.CssRenderInfo;
import annis.gui.widgets.JITWrapper;
import annis.libgui.visualizers.VisualizerInput;
import com.vaadin.ui.Button;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Panel;
import java.util.UUID;

/**
 * RSTPanel manages the scrollbuttons and calles then {@link RSTImpl} the actual
 * implementation of RST. {@link RSTImpl} compute the json out of the Salt
 * document. The whole rendering stuff is done in {@link JITWrapper}.
 *
 * @author Benjamin Weißenfels 
 */
public class RSTPanel extends Panel
{
  private CssRenderInfo renderInfo;

  RSTPanel(VisualizerInput visInput)
  {
    String btWidth = "30px";
    HorizontalLayout grid = new HorizontalLayout();
    final int scrollStep = 200;

    // the calculation of the output json is done here.
    final RSTImpl rstView = new RSTImpl(visInput);
    rstView.setId(UUID.randomUUID().toString());
    
    this.setHeight("-1px");
    this.setWidth("100%");
    grid.setHeight("-1px");
    grid.setWidth("100%");


    final Button buttonLeft = new Button();
    buttonLeft.setWidth(btWidth);
    buttonLeft.setHeight("100%");
    buttonLeft.addStyleName("left-button");
    buttonLeft.setEnabled(false);

    final Button buttonRight = new Button();
    buttonRight.setWidth(btWidth);
    buttonRight.setHeight("100%");
    buttonRight.addStyleName("right-button");

    buttonLeft.addListener(new Button.ClickListener()
    {
      @Override
      public void buttonClick(Button.ClickEvent event)
      {
        if (rstView.getScrollLeft() < scrollStep)
        {
          buttonLeft.setEnabled(false);
          rstView.setScrollLeft(0);
        }
        else
        {
          //if the right button was deactivated set it back
          rstView.setScrollLeft(rstView.getScrollLeft() - scrollStep);
        }

        buttonRight.setEnabled(true);
      }
    });

    buttonRight.addListener(new Button.ClickListener()
    {
      @Override
      public void buttonClick(Button.ClickEvent event)
      {
        renderInfo.calculate("#" + rstView.getId() + " canvas" );
      }
    });
    
    renderInfo = new CssRenderInfo(new CssRenderInfo.Callback() 
    {
      @Override
      public void renderInfoReceived(int width, int height)
      {
        if (width - rstView.getScrollLeft() > scrollStep)
        {
          buttonLeft.setEnabled(true);
          rstView.setScrollLeft(rstView.getScrollLeft() + scrollStep);
        }
        else
        {
          rstView.
            setScrollLeft(
            rstView.getScrollLeft() - (width - rstView.getScrollLeft()));

          buttonLeft.setEnabled(true);
          buttonRight.setEnabled(false);
        }
      }
    });
    rstView.addExtension(renderInfo);

    grid.addComponent(buttonLeft);
    grid.addComponent(rstView);
    grid.addComponent(buttonRight);
    setContent(grid);
    grid.setExpandRatio(rstView, 1.0f);
  }
}