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.solvers;

import android.content.res.Resources;

import org.distorted.objectlib.main.ObjectType;

import org.distorted.objectlib.main.TwistyObject;

import org.distorted.main.R;

import org.distorted.screens.ScreenList;

import org.distorted.screens.RubikScreenSolver;

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

public class SolverMain implements Runnable

{

  private final Resources mRes;

  private final TwistyObject mObject;

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

  public SolverMain(Resources res, TwistyObject object)

    {

    mRes   = res;

    mObject= object;

    }

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

// certain objects have certain cubits locked - for example, the Cube3's centers of

// sides always have the same color.

// If a certain cubit is locked, return the color (index into it's FACE_COLORS array) it

// must have. Otherwise return -1.

  public static int cubitIsLocked(ObjectType object, int cubit)

    {

    if( object == ObjectType.CUBE_3 )

      {

      if( cubit==20 ) return 0; // center of the right  face

      if( cubit==21 ) return 1; // center of the left   face

      if( cubit==22 ) return 2; // center of the up     face

      if( cubit==23 ) return 3; // center of the bottom face

      if( cubit==24 ) return 4; // center of the front  face

      if( cubit==25 ) return 5; // center of the back   face

      }

    return -1;

    }

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

  private void solveCube3(RubikScreenSolver solver)

    {

    String result;

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

      result= "Error 9";

    else

      {

      String objectPosition = prepareCube3position();

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

      }

    if (result.contains("Error"))

      {

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

        {

        case '1': result = mRes.getString(R.string.solver_cube3_error1); break;

        case '2': result = mRes.getString(R.string.solver_cube3_error2); break;

        case '3': result = mRes.getString(R.string.solver_cube3_error3); break;

        case '4': result = mRes.getString(R.string.solver_cube3_error4); break;

        case '5': result = mRes.getString(R.string.solver_cube3_error5); break;

        case '6': result = mRes.getString(R.string.solver_cube3_error6); break;

        case '7': result = mRes.getString(R.string.solver_cube3_error7); break;

        case '8': result = mRes.getString(R.string.solver_cube3_error8); break;

        case '9': result = mRes.getString(R.string.solver_cube3_error9); break;

        }

      solver.displayErrorDialog(result);

      }

    else

      {

      solver.setSolved(result);

      }

    }

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

  private int mapCubitToFace(int cubit, int face)

    {

    if( cubit<8 ) return face;

    if( cubit>19) return 4;

    switch(face)

      {

      case 0: return cubit==15 || cubit==18 ? 3 : 5;

      case 1: return cubit==13 || cubit==16 ? 3 : 5;

      case 2: return cubit==10              ? 5 : 3;

      case 3: return cubit== 8              ? 3 : 5;

      case 4: return cubit== 9              ? 3 : 5;

      case 5: return cubit== 8              ? 5 : 3;

      }

    return -1;

    }

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

// order: Up --> Right --> Front --> Down --> Left --> Back

// (because the first implemented Solver - the two-phase Cube3 one - expects such order)

//

// Solved 3x3x3 Cube maps to "UUUUUUUUURRRRRRRRRFFFFFFFFFDDDDDDDDDLLLLLLLLLBBBBBBBBB"

  private String prepareCube3position()

    {

    StringBuilder objectString = new StringBuilder();

    final int R = 0;

    final int L = 1;

    final int U = 2;

    final int D = 3;

    final int F = 4;

    final int B = 5;

    // 'I' - interior, theoretically can happen

    final char[] FACE_NAMES = { 'R', 'L', 'U', 'D', 'F', 'B', 'I'};

    final int[] U_INDEX = { 2,10, 6,17,22,19, 3,11, 7};

    final int[] R_INDEX = { 7,19, 6,15,20,14, 5,18, 4};

    final int[] F_INDEX = { 3,11, 7,13,24,15, 1, 9, 5};

    final int[] D_INDEX = { 1, 9, 5,16,23,18, 0, 8, 4};

    final int[] L_INDEX = { 2,17, 3,12,21,13, 0,16, 1};

    final int[] B_INDEX = { 6,10, 2,14,25,12, 4, 8, 0};

    for(int i=0; i<9; i++)

      {

      int face = mapCubitToFace(U_INDEX[i],U);

      int color = mObject.getCubitFaceColorIndex(U_INDEX[i], face);

      objectString.append(FACE_NAMES[color]);

      }

    for(int i=0; i<9; i++)

      {

      int face = mapCubitToFace(R_INDEX[i],R);

      int color = mObject.getCubitFaceColorIndex(R_INDEX[i], face);

      objectString.append(FACE_NAMES[color]);

      }

    for(int i=0; i<9; i++)

      {

      int face = mapCubitToFace(F_INDEX[i],F);

      int color = mObject.getCubitFaceColorIndex(F_INDEX[i], face);

      objectString.append(FACE_NAMES[color]);

      }

    for(int i=0; i<9; i++)

      {

      int face = mapCubitToFace(D_INDEX[i],D);

      int color = mObject.getCubitFaceColorIndex(D_INDEX[i], face);

      objectString.append(FACE_NAMES[color]);

      }

    for(int i=0; i<9; i++)

      {

      int face = mapCubitToFace(L_INDEX[i],L);

      int color = mObject.getCubitFaceColorIndex(L_INDEX[i], face);

      objectString.append(FACE_NAMES[color]);

      }

    for(int i=0; i<9; i++)

      {

      int face = mapCubitToFace(B_INDEX[i],B);

      int color = mObject.getCubitFaceColorIndex(B_INDEX[i], face);

      objectString.append(FACE_NAMES[color]);

      }

    return objectString.toString();

    }

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

  private void interruptCube3()

    {

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

    }

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

  public void start()

    {

    Thread thr = new Thread(this);

    thr.start();

    }

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

  public void run()

    {

    RubikScreenSolver solver = (RubikScreenSolver) ScreenList.SVER.getScreenClass();

    if( mObject!=null && mObject.getObjectType()==ObjectType.CUBE_3 )

      {

      solveCube3(solver);

      }

    else

      {

      solver.displayErrorDialog(mRes.getString(R.string.solver_generic_error1));

      }

    }

}