/* Copyright 2010 ESRI
* 
* All rights reserved under the copyright laws of the United States
* and applicable international laws, treaties, and conventions.
* 
* You may freely redistribute and use this sample code, with or
* without modification, provided you include the original copyright
* notice and use restrictions.
* 
* See the use restrictions.
* 
*/
package com.esri.adf.sample.resource;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Serializable;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.esri.adf.sample.resource.util.MyCustomUtil;
import com.esri.adf.web.data.GISResource;
import com.esri.adf.web.data.OverviewFunctionality;
import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.WebElementConverter;
import com.esri.adf.web.data.WebOverview;
import com.esri.adf.web.data.geometry.WebExtent;
import com.esri.adf.web.data.geometry.WebSpatialReference;
import com.esri.adf.web.util.ImageUtil;
import com.esri.adf.web.util.WebUtil;

/**
 * <b>GraphicsOverviewFunctionality</b> provides overview capability for <b>GraphicsResource</b>.
 */
public class MyCustomOverviewFunctionality implements OverviewFunctionality, Serializable {
  private static final long serialVersionUID = 1L;

  private static Logger logger = Logger.getLogger(MyCustomOverviewFunctionality.class.getName());

  private MyCustomResource resource = null;

  private boolean disabled = false;

  public void initFunctionality(GISResource resource) {
    logger.log(Level.FINE, "GraphicsOverviewFunctionality.initFunctionality(" + resource + ")");
    if (resource == null) {
      throw new ADFMyCustomException("Resource is null");
    }
    if (!(resource instanceof MyCustomResource)) {
      throw new ADFMyCustomException("Resource is not a instance of GraphicsResource");
    }
    this.resource = (MyCustomResource) resource;
  }

  public void destroyFunctionality() {
  }

  public InputStream exportImage() {
    WebContext mwContext = this.resource.getWebContext();
    WebOverview mwOverview = mwContext.getWebOverview();
    WebExtent overviewExtent = mwOverview.getDrawExtent();
    WebSpatialReference mapsr = this.resource.getDefaultSpatialReference();
    int width = mwOverview.getWidth();
    int height = mwOverview.getHeight();

    WebExtent currentExtent = null;

    if (mapsr != null && !(mwContext.getSpatialReference().equals(mapsr))) {
      logger.fine("Projecting the current extent");
      currentExtent = mwContext.projectExtent(currentExtent);
      logger.fine("Projected Extent : " + currentExtent);
    }

    logger.fine("Reaspecting the current extent");
    currentExtent = WebUtil.reaspect(overviewExtent, width, height);
    logger.fine("Reaspected Extent : " + currentExtent);

    mwOverview.setDrawExtent(new WebExtent(currentExtent.getMinX(), currentExtent.getMinY(), currentExtent.getMaxX(),
        currentExtent.getMaxY(), mwContext.getSpatialReference()));
    try {
      WebElementConverter converter = new WebElementConverter(width, height);
      converter.draw(MyCustomUtil.drawGrid(width, height, 50));

      if (mwOverview.isLastEnabledOverviewFunctionality(this) && mwContext.getResources().size() > 1) {
        InputStream opaqueImage = new ByteArrayInputStream(ImageUtil.createBlankImage(width, height, 1D, "PNG"));
        InputStream transparentImage = new ByteArrayInputStream(converter.getPNGImage());
        return new ByteArrayInputStream(ImageUtil.mergeImages(new InputStream[] { transparentImage, opaqueImage },
            "PNG"));
      }
      return new ByteArrayInputStream(converter.getPNGImage());
    } catch (Exception e) {
      throw new ADFMyCustomException("Unable to export overview image.", e);
    }
  }

  public MyCustomResource getResource() {
    return this.resource;
  }

  public boolean isDisabled() {
    return this.disabled;
  }

  public void setDisabled(boolean disabled) {
    this.disabled = disabled;
  }
}