/*
  JWildfire - an image and animation processor written in Java 
  Copyright (C) 1995-2011 Andreas Maschke

  This is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser 
  General Public License as published by the Free Software Foundation; either version 2.1 of the 
  License, or (at your option) any later version.
 
  This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without 
  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License along with this software; 
  if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jwildfire.create.tina.variation;

import static org.jwildfire.base.mathlib.MathLib.log;
import static org.jwildfire.base.mathlib.MathLib.floor;
import static org.jwildfire.base.mathlib.MathLib.pow;

import org.jwildfire.base.Tools;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;

public class RandCubesFunc extends VariationFunc {
  private static final long serialVersionUID = 1L;

  private static final String PARAM_BLOCKSIZE = "blockSize";
  private static final String PARAM_BLOCKHEIGHT = "blockHeight";
  private static final String PARAM_SPREAD = "spread";
  private static final String PARAM_SEED = "seed";
  private static final String PARAM_DENSITY = "density";
  private static final String[] paramNames = { PARAM_BLOCKSIZE, PARAM_BLOCKHEIGHT, PARAM_SPREAD, PARAM_SEED, PARAM_DENSITY };

  private double blockSize = 1.0;
  private double blockHeight = 1.0;
  private double spread = 3.0;
  private int seed = 1;
  private double density = 1.0;

  private double hash(int a) {  //http://burtleburtle.net/bob/hash/integer.html
	  a = (a ^ 61) ^ (a >> 16);
	  a = a + (a << 3);
	  a = a ^ (a >> 4);
	  a = a * 0x27d4eb2d;
	  a = a ^ (a >> 15);
	  return (double) a / (double) Integer.MAX_VALUE;
  }
  
  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    // Translation of variation by bezo97, https://bezo97.tk/plugins.html
	  double outx = (floor(log(pContext.random()) * (pContext.random() < 0.5 ? spread : -spread)));
	  double outy = (floor(log(pContext.random()) * (pContext.random() < 0.5 ? spread : -spread)));
	  int blockx = (int) outx, blocky = (int) outy;	  
	  double z = hash(blockx * seed) + hash(blockx + blocky * seed); //random height for each block
	  
	  outx = ((double) blockx * density + pContext.random()) * blockSize;
	  outy = ((double) blocky * density + pContext.random()) * blockSize;
	  double outz = blockHeight * z * pow(pContext.random(), 0.125); //fade out down

	  
	  pVarTP.x = outx * pAmount; //not +=
      pVarTP.y = outy * pAmount;
      pVarTP.z = outz * pAmount;
      
      pVarTP.color = z / 2.0; //block height -> palette location

  }

  @Override
  public String[] getParameterNames() {
    return paramNames;
  }

  @Override
  public Object[] getParameterValues() {
    return new Object[] { blockSize, blockHeight, spread, seed, density };
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_BLOCKSIZE.equalsIgnoreCase(pName))
      blockSize = pValue;
    else if (PARAM_BLOCKHEIGHT.equalsIgnoreCase(pName))
      blockHeight = pValue;
    else if (PARAM_SPREAD.equalsIgnoreCase(pName))
        spread = pValue;
    else if (PARAM_SEED.equalsIgnoreCase(pName))
        seed = Tools.FTOI(pValue);
    else if (PARAM_DENSITY.equalsIgnoreCase(pName))
        density = pValue;
    else
      throw new IllegalArgumentException(pName);
  }

  @Override
  public String getName() {
    return "randCubes";
  }

}