Magic Cube

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

// Copyright 2020 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.states;

import android.content.SharedPreferences;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.PorterDuff;

import android.graphics.drawable.Drawable;

import android.support.v4.content.ContextCompat;

import android.util.DisplayMetrics;

import android.view.View;

import android.widget.Button;

import android.widget.ImageButton;

import android.widget.LinearLayout;

import org.distorted.main.R;

import org.distorted.main.RubikActivity;

import org.distorted.main.RubikPostRender;

import org.distorted.objects.RubikObjectList;

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

public class RubikStateSolver extends RubikStateAbstract

  {

  private static final int NUM_FACES   =  6;

  private static final int BITMAP_SIZE = 35;

  private static final int[] FACE_COLORS = new int[]

         {

           0xffffff00, 0xffffffff,

           0xff0000ff, 0xff00ff00,

           0xffff0000, 0xffb5651d

         };

  private static Bitmap[] mBitmap;

  private ImageButton[] mColorButton;

  private Button mBackButton, mSolveButton;

  private boolean mSolving;

  private int mCurrentColor;

  private class Solver implements Runnable

    {

    private String mCubeString;

    private RubikActivity mAct;

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

    Solver(String str, RubikActivity act)

   	  {

	    mCubeString = str;

	    mAct        = act;

   	  }

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

    public void start()

      {

	    Thread thr = new Thread(this);

	    thr.start();

      }

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

    public void interrupt()

      {

	    org.distorted.solvers.cube3.Search.interrupt();

      }

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

    public void run()

	    {

	    Resources res = mAct.getResources();

	    String result;

	    if( !org.distorted.solvers.cube3.Search.prepare(res) )

	      result= "Error 9";

	    else

	      result = org.distorted.solvers.cube3.Search.solution(mCubeString, 24, 20);

	    if (result.contains("Error"))

	      {

	      switch (result.charAt(result.length() - 1))

	        {

		      case '1': result = res.getString(R.string.error1); break;

		      case '2': result = res.getString(R.string.error2); break;

		      case '3': result = res.getString(R.string.error3); break;

		      case '4': result = res.getString(R.string.error4); break;

		      case '5': result = res.getString(R.string.error5); break;

		      case '6': result = res.getString(R.string.error6); break;

		      case '7': result = res.getString(R.string.error7); break;

		      case '8': result = res.getString(R.string.error8); break;

		      case '9': result = res.getString(R.string.error9); break;

		      }

	      // TODO: pop up an error dialog.

	      }

	    else

        {

        setSolved( mAct, org.distorted.solvers.cube3.Search.numMoves(), result);

        }

	    }

    }

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

  void leaveState(RubikActivity act)

    {

    RubikPostRender post = act.getPostRender();

    post.resetAllTextureMaps();

    }

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

  void enterState(final RubikActivity act)

    {

    mSolving = false;

    act.changeObject(RubikObjectList.CUBE,3,null);

    RubikStatePlay play = (RubikStatePlay)RubikState.PLAY.getStateClass();

    play.setObjectAndSize(RubikObjectList.CUBE,3);

    DisplayMetrics metrics = act.getResources().getDisplayMetrics();

    final float scale = metrics.density;

    // TOP ////////////////////////////

    LinearLayout layoutTop = act.findViewById(R.id.upperBar);

    layoutTop.removeAllViews();

    if( mBitmap     ==null ) setupBitmaps(scale);

    if( mColorButton==null ) setupColorButtons(act,scale);

    markButton(act);

    for(ImageButton button: mColorButton) layoutTop.addView(button);

    // BOT ////////////////////////////

    if( mSolveButton==null ) setupSolveButton(act,scale);

    LinearLayout layoutLeft = act.findViewById(R.id.mainBarLeft);

    layoutLeft.removeAllViews();

    layoutLeft.addView(mSolveButton);

    if( mBackButton==null ) setupBackButton(act,scale);

    LinearLayout layoutRight = act.findViewById(R.id.mainBarRight);

    layoutRight.removeAllViews();

    layoutRight.addView(mBackButton);

    }

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

  private void setSolved( RubikActivity act, int numMoves, String moves)

    {

    mSolving = false;

    RubikState.switchState(act,RubikState.SOLU);

    }

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

  private void setupBitmaps(float scale)

    {

    final int SIZE = (int)(scale*BITMAP_SIZE);

    final float R = SIZE*0.10f;

    final float M = SIZE*0.05f;

    mBitmap = new Bitmap[NUM_FACES];

    Paint paint = new Paint();

    paint.setColor(0xff008800);

    paint.setStyle(Paint.Style.FILL);

    paint.setAntiAlias(true);

    paint.setTextAlign(Paint.Align.CENTER);

    paint.setStyle(Paint.Style.FILL);

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

      {

      mBitmap[i] = Bitmap.createBitmap(SIZE, SIZE, Bitmap.Config.ARGB_8888);

      Canvas canvas = new Canvas(mBitmap[i]);

      paint.setColor(0xff000000);

      canvas.drawRect(0, 0, SIZE, SIZE, paint);

      paint.setColor(FACE_COLORS[i]);

      canvas.drawRoundRect( M, M, SIZE-M, SIZE-M, R, R, paint);

      }

    }

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

  private void setupColorButtons(final RubikActivity act, final float scale)

    {

    mColorButton = new ImageButton[NUM_FACES];

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

      {

      final int ii = i;

      int padding = (int)(3*scale + 0.5f);

      LinearLayout.LayoutParams objectParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.MATCH_PARENT, 1.0f);

      mColorButton[i] = new ImageButton(act);

      mColorButton[i].setLayoutParams(objectParams);

      mColorButton[i].setPadding(padding,0,padding,0);

      mColorButton[i].setImageBitmap(mBitmap[i]);

      mColorButton[i].setOnClickListener( new View.OnClickListener()

        {

        @Override

        public void onClick(View view)

          {

          mCurrentColor = ii;

          markButton(act);

          }

        });

      }

    }

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

  private void setupSolveButton(final RubikActivity act, final float scale)

    {

    int padding = (int)(3*scale + 0.5f);

    LinearLayout.LayoutParams backParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);

    mSolveButton = new Button(act);

    mSolveButton.setLayoutParams(backParams);

    mSolveButton.setPadding(padding,0,padding,0);

    mSolveButton.setText(R.string.solve);

    mSolveButton.setOnClickListener( new View.OnClickListener()

      {

      @Override

      public void onClick(View v)

        {

        if( !mSolving )

          {

          String cubeString = "INVALID"; // TODO: obtain a valid cube string

          Solver solver = new Solver(cubeString, act );

          solver.start();

          mSolving = true;

          }

        }

      });

    }

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

  private void setupBackButton(final RubikActivity act, final float scale)

    {

    int padding = (int)(3*scale + 0.5f);

    LinearLayout.LayoutParams backParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);

    mBackButton = new Button(act);

    mBackButton.setLayoutParams(backParams);

    mBackButton.setPadding(padding,0,padding,0);

    mBackButton.setText(R.string.back);

    mBackButton.setOnClickListener( new View.OnClickListener()

      {

      @Override

      public void onClick(View v)

        {

        RubikState.goBack(act);

        }

      });

    }

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

  private void markButton(RubikActivity act)

    {

    for(int b=0; b<NUM_FACES; b++)

      {

      Drawable d = mColorButton[b].getBackground();

      if( b==mCurrentColor )

        {

        d.setColorFilter(ContextCompat.getColor(act,R.color.red), PorterDuff.Mode.MULTIPLY);

        }

      else

        {

        d.clearColorFilter();

        }

      }

    }

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

  public void savePreferences(SharedPreferences.Editor editor)

    {

    mColorButton = null;

    mBackButton  = null;

    mSolveButton = null;

    editor.putInt("stateSolver_color", mCurrentColor);

    }

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

  public void restorePreferences(SharedPreferences preferences)

    {

    mCurrentColor = preferences.getInt("stateSolver_color", 0);

    }

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

  public int getCurrentColor()

    {

    return mCurrentColor;

    }

  }