Magic Cube

///////////////////////////////////////////////////////////////////////////////////////////////////

// Copyright 2019 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Magic Cube.                                                              //

//                                                                                               //

// Magic Cube is free software: you can redistribute it and/or modify                            //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Magic Cube 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 General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Magic Cube.  If not, see <http://www.gnu.org/licenses/>.                           //

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.effect.scramble;

import org.distorted.effect.BaseEffect;

import org.distorted.library.effect.Effect;

import org.distorted.library.main.DistortedEffects;

import org.distorted.library.message.EffectListener;

import org.distorted.magic.RubikRenderer;

import org.distorted.object.RubikObject;

import java.lang.reflect.Method;

import java.util.Random;

///////////////////////////////////////////////////////////////////////////////////////////////////

public abstract class ScrambleEffect extends BaseEffect implements EffectListener

{

  public enum Type

    {

    NONE         (ScrambleEffectNone.class        ),

    ROTATIONS    (ScrambleEffectRotations.class   ),

    ;

    final Class<? extends ScrambleEffect> effect;

    Type(Class<? extends ScrambleEffect> effect)

      {

      this.effect= effect;

      }

    }

  private static int NUM_EFFECTS = Type.values().length;

  private static final int FAKE_EFFECT_ID  = -3;

  private static final Type[] types;

  static

    {

    int i=0;

    types = new Type[NUM_EFFECTS];

    for(Type type: Type.values())

      {

      types[i++] = type;

      }

    }

  private EffectListener mListener;

  private int mEffectReturned;

  private long mCurrentBaseEffectID;

  private int mNumDoubleScramblesLeft, mNumScramblesLeft;

  private int mLastVector;

  private long mDurationSingleTurn;

  private Random mRnd;

  private RubikObject mObject;

  private int mNumAxis;

  private int mBasicAngle;

  Effect[] mNodeEffects;

  int[] mNodeEffectPosition;

  Effect[] mCubeEffects;

  int[] mCubeEffectPosition;

  int mCubeEffectNumber, mNodeEffectNumber;

///////////////////////////////////////////////////////////////////////////////////////////////////

  ScrambleEffect()

    {

    mRnd = new Random( System.currentTimeMillis() );

    mLastVector = -2;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  abstract void createEffects(int duration, int numScrambles);

  abstract void effectFinishedPlugin(final long effectID);

///////////////////////////////////////////////////////////////////////////////////////////////////

// first compute how many out of 'numScrambles' are double turns (this will matter when we compute

// the time a single quarter-turn takes!

//

// Only works for

// basicAngle==4, i.e. something whose rotations are by  90 degrees (RubikCube) or

// basicAngle==3, i.e. something whose rotations are by 120 degrees (a Pyramix) or

// basicAngle==2, i.e. something whose rotations are by 180 degrees (e.g. a 3x2x1 'Bunny')

  private void createBaseEffects(int duration, int numScrambles)

    {

    mNumScramblesLeft = numScrambles;

    mNumDoubleScramblesLeft=0;

    if( mBasicAngle>=4 )

      {

      for(int i=0; i<numScrambles; i++)

        {

        if( (mRnd.nextInt() % 3) == 0 )

          {

          mNumDoubleScramblesLeft++;

          }

        }

      }

    mDurationSingleTurn = duration/(mNumScramblesLeft+mNumDoubleScramblesLeft);

    addNewScramble();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

// only works if basicAngle<=4, i.e. won't work for something whose basic rotations are by less

// than 90 degrees.

  private void addNewScramble()

    {

    if( mNumScramblesLeft>0 )

      {

      if( mLastVector == -2 )

        {

        mLastVector = mRnd.nextInt(mNumAxis);

        }

      else

        {

        int newVector = mRnd.nextInt(mNumAxis-1);

        mLastVector = (newVector>=mLastVector ? newVector+1 : newVector);

        }

      int rowBitmap  = (1<<mRnd.nextInt(mObject.getSize()));

      int angle= randomizeAngle();

      int absAngle = (angle<0 ? -angle : angle);

      long durationMillis =  absAngle*mDurationSingleTurn;

      mNumScramblesLeft--;

      if( absAngle==2 ) mNumDoubleScramblesLeft--;

      if( mNumScramblesLeft==0 && mNumDoubleScramblesLeft!=0 )

        {

        android.util.Log.e("effect", "ERROR: "+mNumDoubleScramblesLeft);

        }

      mCurrentBaseEffectID = mObject.addNewRotation(mLastVector, rowBitmap, angle*(360/mBasicAngle), durationMillis, this );

      }

    else

      {

      mLastVector = -1;

      if( mEffectReturned == mCubeEffectNumber+mNodeEffectNumber )

        {

        mListener.effectFinished(FAKE_EFFECT_ID);

        }

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

// only works for basicAngle<=4.

  private int randomizeAngle()

    {

    int random = mRnd.nextInt(mNumScramblesLeft);

    int result = random<mNumDoubleScramblesLeft ? 2:1;

    int sign   = mRnd.nextInt(2);

    return sign==0 ? result : -result;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  private void assignEffects()

    {

    for(int i=0; i<mCubeEffectNumber; i++)

      {

      mObject.apply(mCubeEffects[i],mCubeEffectPosition[i]);

      mCubeEffects[i].notifyWhenFinished(this);

      }

    DistortedEffects nodeEffects = mObject.getEffects();

    for(int i=0; i<mNodeEffectNumber; i++)

      {

      nodeEffects.apply(mNodeEffects[i],mNodeEffectPosition[i]);

      mNodeEffects[i].notifyWhenFinished(this);

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  private void disassignEffects()

    {

    for(int i=0; i<mCubeEffectNumber; i++)

      {

      mObject.remove(mCubeEffects[i].getID());

      }

    DistortedEffects nodeEffects = mObject.getEffects();

    for(int i=0; i<mNodeEffectNumber; i++)

      {

      nodeEffects.abortById(mNodeEffects[i].getID());

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

// PUBLIC API

///////////////////////////////////////////////////////////////////////////////////////////////////

  @SuppressWarnings("unused")

  public static String[] getNames()

    {

    String[] names = new String[NUM_EFFECTS];

    for( int i=0; i<NUM_EFFECTS; i++)

      {

      names[i] = types[i].name();

      }

    return names;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  @SuppressWarnings("unused")

  public static ScrambleEffect create(int ordinal) throws InstantiationException, IllegalAccessException

    {

    return types[ordinal].effect.newInstance();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  public void effectFinished(final long effectID)

    {

    if( effectID == mCurrentBaseEffectID )

      {

      mObject.removeRotationNow();

      addNewScramble();

      return;

      }

    for(int i=0; i<mCubeEffectNumber; i++)

      {

      long id = mCubeEffects[i].getID();

      if( effectID == id )

        {

        mEffectReturned++;

        effectFinishedPlugin(effectID);

        if( mEffectReturned == mCubeEffectNumber+mNodeEffectNumber )

          {

          disassignEffects();

          if( mNumScramblesLeft==0 )

            {

            mListener.effectFinished(FAKE_EFFECT_ID);

            }

          }

        return;

        }

      }

    for(int i=0; i<mNodeEffectNumber; i++)

      {

      long id = mNodeEffects[i].getID();

      if( effectID == id )

        {

        mEffectReturned++;

        effectFinishedPlugin(effectID);

        if( mEffectReturned == mCubeEffectNumber+mNodeEffectNumber )

          {

          disassignEffects();

          if( mNumScramblesLeft==0 )

            {

            mListener.effectFinished(FAKE_EFFECT_ID);

            }

          }

        return;

        }

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  @SuppressWarnings("unused")

  public long start(int duration, RubikRenderer renderer)

    {

    mObject   = renderer.getObject();

    mListener = renderer;

    mObject.solve();

    mNumAxis    = mObject.getRotationAxis().length;

    mBasicAngle = mObject.getBasicAngle();

    int numScrambles = renderer.getNumScrambles();

    int dura = (int)(duration*Math.pow(numScrambles,0.6f));

    createBaseEffects(dura,numScrambles);

    createEffects    (dura,numScrambles);

    if( mCubeEffectNumber==0 && mNodeEffectNumber==0 )

      {

      throw new RuntimeException("Cube and Node Plugin Effects not created!");

      }

    assignEffects();

    return FAKE_EFFECT_ID;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  @SuppressWarnings("unused")

  public static void enableEffects()

    {

    Method method;

    for(Type type: Type.values())

      {

      try

        {

        method = type.effect.getDeclaredMethod("enable"); // enable not public, thus getDeclaredMethod

        }

      catch(NoSuchMethodException ex)

        {

        android.util.Log.e("ScrambleEffect", type.effect.getSimpleName()+": exception getting method: "+ex.getMessage());

        method = null;

        }

      try

        {

        if( method!=null ) method.invoke(null);

        }

      catch(Exception ex)

        {

        android.util.Log.e("ScrambleEffect", type.effect.getSimpleName()+": exception invoking method: "+ex.getMessage());

        }

      }

    }

}