
/**

 * For source:

 * 

 * https://github.com/berlinbrown/physicsforprogrammers/tree/master/projects/MathServices

 * 

 * Also see:

 * 

 * https://github.com/berlinbrown

 * http://berlinbrown.github.com/

 * http://berlinbrown.github.com/applets.html

 */

package org.berlin.chem.gae.web;



/*

 * Pngj PNG writer used with Google App Engine.

 * 

 * From pngj:

 * http://code.google.com/p/pngj/ 

 */



import java.io.IOException;

import java.io.OutputStream;

import java.util.Random;

import java.util.Stack;

import java.util.Vector;



import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.berlin.chem.gae.DBModelSquirmReaction;

import org.berlin.chem.gae.DBSquirm;

import org.berlin.chem.gae.DBSquirmCell;

import org.berlin.chem.gae.DBSquirmChemistry;

import org.berlin.chem.gae.dao.ArtificialChemistryStateDAO;



import com.google.appengine.api.datastore.Entity;

import com.google.appengine.api.datastore.Text;



/**

 * Basic math utilities for google app engine.

 * 

 * @author bbrown (berlin.brown at gmail.com)

 *

 */

public class ArtificialChemistryImageServlet extends HttpServlet {

   

  /**

   * Serial version id. 

   */

  private static final long serialVersionUID = 1L;

  

  public void doGet(final HttpServletRequest request, final HttpServletResponse response) throws IOException {  

    doPost(request, response);

  } // End of the class //

  

  public void doPost(final HttpServletRequest request, final HttpServletResponse response) throws IOException {        

    response.setContentType("image/png");              

    final OutputStream os = response.getOutputStream();

    final ArtificialChemistryStateDAO dao = new ArtificialChemistryStateDAO();    

    long t1 = System.currentTimeMillis();    

    final Stack<String> recordDatabase = new Stack<String>();    

    Text dataForStack = null;

    for (final Entity ee : dao.list()) {

        dataForStack = (Text)ee.getProperty("chemlog");

        break;

    }

    if (dataForStack != null) {

        recordDatabase.push(dataForStack.getValue());

        } // End of the if //        

    final Vector<DBSquirmCell> cellListDatabase = new Vector<DBSquirmCell>();        

    final Vector<DBModelSquirmReaction> reactionDatabase = new Vector<DBModelSquirmReaction>();                                                       

    final DBSquirmChemistry chemistry = new DBSquirmChemistry(reactionDatabase);

    final DBSquirm squirmFrame = new DBSquirm(cellListDatabase, recordDatabase);                             

    squirmFrame.initSquirmChem(chemistry, 5);

    squirmFrame.step(chemistry, 30);

    squirmFrame.render(os);    

    final Random random = new Random();

    if (!recordDatabase.isEmpty()) {

        if (random.nextDouble() < 0.10) {

            dao.log(request.getRemoteAddr(), recordDatabase.peek());

        }

    } // End of the if //    

  } // End of the class //  

} // End of the class //