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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2023 Leszek Koltunski //
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// //
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// This file is part of Magic Cube. //
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// //
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// Magic Cube is proprietary software licensed under an EULA which you should have received //
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// along with the code. If not, check https://distorted.org/magic/License-Magic-Cube.html //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.solvers;
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import android.content.res.Resources;
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import org.distorted.main.R;
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import org.distorted.objectlib.main.ObjectSignatures;
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import org.distorted.objectlib.main.TwistyObject;
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import org.distorted.objectlib.tablebases.ImplementedTablebasesList;
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import org.distorted.objectlib.tablebases.TablebaseHelpers;
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import org.distorted.objectlib.tablebases.TablebasesAbstract;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public class SolverSkewb extends SolverTablebase
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{
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private static final int ERROR_CORNER_135_MISSING = -1;
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private static final int ERROR_CORNER_134_MISSING = -2;
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private static final int ERROR_CORNER_125_MISSING = -3;
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private static final int ERROR_CORNER_124_MISSING = -4;
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private static final int ERROR_CORNER_035_MISSING = -5;
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private static final int ERROR_CORNER_034_MISSING = -6;
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private static final int ERROR_CORNER_025_MISSING = -7;
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private static final int ERROR_CORNER_024_MISSING = -8;
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private static final int ERROR_CENTER_0_MISSING = -9;
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private static final int ERROR_CENTER_1_MISSING = -10;
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private static final int ERROR_CENTER_2_MISSING = -11;
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private static final int ERROR_CENTER_3_MISSING = -12;
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private static final int ERROR_CENTER_4_MISSING = -13;
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private static final int ERROR_CENTER_5_MISSING = -14;
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private static final int ERROR_CORNERS_CANNOT = -15;
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private static final int ERROR_CORNER_TWISTED = -16;
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private static final int ERROR_TWO_CENTERS = -17;
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private static final int ERROR_TWO_CORNERS = -18;
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private static final int ERROR_IMPOSSIBLE = -19;
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private TablebasesAbstract mSolver;
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private final int[] mFaceColors;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public SolverSkewb(Resources res, TwistyObject object)
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{
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super(res,object);
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mFaceColors = new int[6];
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private void getCorners(TwistyObject object, int[][] corners)
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{
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for(int i=0; i<8; i++)
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for(int j=0; j<3; j++)
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corners[i][j] = object.getCubitFaceStickerIndex(i,j);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private void getCenters(TwistyObject object, int[] centers)
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{
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int[] map = {12,13,10,11,8,9};
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for(int i=0; i<6; i++)
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centers[i] = object.getCubitFaceStickerIndex(map[i],0) - 6;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int commonCornerColor(int[] c1, int[] c2)
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{
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int theSame = 0;
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int index = 0;
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for(int i=0; i<3; i++)
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for(int j=0; j<3; j++)
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if( c1[i]==c2[j] )
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{
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index = i;
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theSame++;
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}
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return theSame==1 ? c1[index] : ERROR_CORNERS_CANNOT;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int computeFaceColors(int[][] corners, int[] output)
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{
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final int[][] map = { {0,3},{5,6},{0,5},{6,3},{0,6},{3,5} };
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for(int i=0; i<6; i++)
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{
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int c1 = map[i][0];
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int c2 = map[i][1];
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output[i] = commonCornerColor(corners[c1],corners[c2]);
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if( output[i]<0 ) return ERROR_CORNERS_CANNOT;
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}
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private boolean cornerIs(int[] corner, int c0, int c1, int c2)
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{
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return ( (corner[0]==c0 && corner[1]==c1 && corner[2]==c2 ) ||
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(corner[1]==c0 && corner[2]==c1 && corner[0]==c2 ) ||
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(corner[2]==c0 && corner[0]==c1 && corner[1]==c2 ) );
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int checkAllCornersPresent(int[][] corners)
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{
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boolean[] present = new boolean[8];
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for(int i=0; i<8; i++)
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{
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if( cornerIs(corners[i],4,2,0) ) present[0]=true;
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if( cornerIs(corners[i],2,5,0) ) present[1]=true;
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if( cornerIs(corners[i],3,4,0) ) present[2]=true;
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if( cornerIs(corners[i],5,3,0) ) present[3]=true;
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if( cornerIs(corners[i],1,2,4) ) present[4]=true;
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if( cornerIs(corners[i],5,2,1) ) present[5]=true;
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if( cornerIs(corners[i],4,3,1) ) present[6]=true;
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if( cornerIs(corners[i],1,3,5) ) present[7]=true;
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}
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if( !present[0] ) return ERROR_CORNER_024_MISSING;
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if( !present[1] ) return ERROR_CORNER_025_MISSING;
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if( !present[2] ) return ERROR_CORNER_034_MISSING;
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if( !present[3] ) return ERROR_CORNER_035_MISSING;
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if( !present[4] ) return ERROR_CORNER_124_MISSING;
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if( !present[5] ) return ERROR_CORNER_125_MISSING;
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if( !present[6] ) return ERROR_CORNER_134_MISSING;
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if( !present[7] ) return ERROR_CORNER_135_MISSING;
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int checkAllCentersPresent(int[] centers)
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{
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boolean[] present = new boolean[6];
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for(int i=0; i<6; i++) present[centers[i]]= true;
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if( !present[0] ) return ERROR_CENTER_4_MISSING;
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if( !present[1] ) return ERROR_CENTER_5_MISSING;
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if( !present[2] ) return ERROR_CENTER_2_MISSING;
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if( !present[3] ) return ERROR_CENTER_3_MISSING;
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if( !present[4] ) return ERROR_CENTER_0_MISSING;
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if( !present[5] ) return ERROR_CENTER_1_MISSING;
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// free corners: 1,2,4,7
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private int retCornerPermutation(int[] perm, int[][] corners)
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{
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int[] map = {1,2,4,7};
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perm[0] = 0;
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perm[1] = -1;
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perm[2] = -1;
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perm[3] = 3;
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perm[4] = -1;
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perm[5] = 5;
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perm[6] = 6;
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perm[7] = -1;
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for(int i=0; i<4; i++)
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{
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int index = map[i];
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int[] cor = corners[index];
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if( cornerIs(cor,2,5,0) ) perm[1] = index;
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if( cornerIs(cor,3,4,0) ) perm[2] = index;
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if( cornerIs(cor,1,2,4) ) perm[4] = index;
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if( cornerIs(cor,1,3,5) ) perm[7] = index;
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}
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if( perm[1]==-1 ) return ERROR_CORNER_025_MISSING;
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if( perm[2]==-1 ) return ERROR_CORNER_034_MISSING;
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if( perm[4]==-1 ) return ERROR_CORNER_124_MISSING;
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if( perm[7]==-1 ) return ERROR_CORNER_135_MISSING;
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private void fillCornerTwists(int[] output, int[][] corners, int[] perm)
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{
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final int[] map = { 4,2,3,5,1,5,4,1 };
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for(int i=0; i<8; i++)
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{
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int color = mFaceColors[map[i]];
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int[] c = corners[perm[i]];
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if( c[0]==color ) output[i] = 0;
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else if( c[1]==color ) output[i] = 1;
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else output[i] = 2;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int computeCenterTwist(int p1, int p2)
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{
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if( p1==1 )
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{
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switch(p2)
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{
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case 2: return 2;
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case 4: return 1;
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case 7: return 0;
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}
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}
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if( p1==2 )
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{
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switch(p2)
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{
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case 1: return 2;
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case 4: return 0;
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case 7: return 1;
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}
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}
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if( p1==4 )
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{
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switch(p2)
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{
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case 1: return 1;
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case 2: return 0;
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case 7: return 2;
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}
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}
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if( p1==7 )
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{
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switch(p2)
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{
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case 1: return 0;
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case 2: return 1;
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case 4: return 2;
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}
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}
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return ERROR_IMPOSSIBLE;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int positionOfFirstCorner(int[] perm, int[] twist)
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{
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int total_fixed_twist = twist[0]+twist[3]+twist[5]+twist[6];
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int twist_42 = computeCenterTwist(perm[4],perm[2]);
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int twist_21 = computeCenterTwist(perm[2],perm[1]);
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if( twist_42<0 || twist_21<0 ) return ERROR_IMPOSSIBLE;
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android.util.Log.e("D", "twist42 "+twist_42+" twist21 "+twist_21+" total: "+total_fixed_twist);
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if( (twist_21-twist_42+1)%3 != 0 ) return ERROR_TWO_CORNERS;
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if( (total_fixed_twist-twist_42)%3 !=0 ) return ERROR_CORNER_TWISTED;
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switch(perm[1])
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{
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case 1: return 0;
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case 2: return 1;
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case 4: return 2;
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case 7: return 3;
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}
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return ERROR_IMPOSSIBLE;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public int tablebaseIndex(TwistyObject object)
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{
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int[][] corners= new int[8][3];
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int[] centers = new int[6];
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int[] twist = new int[8];
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int[] perm = new int[8];
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getCorners(object,corners);
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int result1 = computeFaceColors(corners,mFaceColors);
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if( result1<0 ) return result1;
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int result2 = checkAllCornersPresent(corners);
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if( result2<0 ) return result2;
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getCenters(object,centers);
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int result3 = checkAllCentersPresent(centers);
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if( result3<0 ) return result3;
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/*
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for(int i=0; i<8; i++)
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for(int j=0; j<3; j++) android.util.Log.e("D", "corner "+i+" face "+j+" : "+corners[i][j]);
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for(int i=0; i<6; i++) android.util.Log.e("D", "center "+i+" : "+centers[i]);
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for(int i=0; i<6; i++) android.util.Log.e("D", "face "+i+" : "+mFaceColors[i]);
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*/
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if( !TablebaseHelpers.permutationIsEven(centers) ) return ERROR_TWO_CENTERS;
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int center_perm_num = TablebaseHelpers.computeEvenPermutationNum(centers);
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322
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int result4 = retCornerPermutation(perm,corners);
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if( result4<0 ) return result4;
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325
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fillCornerTwists(twist,corners,perm);
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for(int i=0; i<8; i++) android.util.Log.e("D", "perm "+i+" : "+perm[i]);
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for(int i=0; i<8; i++) android.util.Log.e("D", "twist "+i+" : "+twist[i]);
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330
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int totalTwist = 0;
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for(int i=0; i<8; i++) totalTwist += twist[i];
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android.util.Log.e("D", "total twist "+totalTwist);
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335
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if( (totalTwist%3)!=0 ) return ERROR_CORNER_TWISTED;
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int total = twist[0]+ 3*(twist[1]+ 3*(twist[2]+ 3*(twist[3]+ 3*(twist[4]+ 3*(twist[5]+ 3*twist[6])))));
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339
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int corner1 = positionOfFirstCorner(perm,twist);
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if( corner1<0 ) return ERROR_TWO_CORNERS;
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342
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android.util.Log.e("D", "corner1: "+corner1+" center perm: "+center_perm_num+" twist: "+total);
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344
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return corner1 + 4*(center_perm_num + 360*total);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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349
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private int getColorIndex2(int face)
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{
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switch(mFaceColors[face])
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{
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case 0: return R.string.color_yellow2;
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case 1: return R.string.color_white2;
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case 2: return R.string.color_blue2;
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case 3: return R.string.color_green2;
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case 4: return R.string.color_red2;
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case 5: return R.string.color_orange2;
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360
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}
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361
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return -1;
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}
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364
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365
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///////////////////////////////////////////////////////////////////////////////////////////////////
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366
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367
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private int getColorIndex3(int face)
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|
368
|
{
|
|
369
|
switch(mFaceColors[face])
|
|
370
|
{
|
|
371
|
case 0: return R.string.color_yellow3;
|
|
372
|
case 1: return R.string.color_white3;
|
|
373
|
case 2: return R.string.color_blue3;
|
|
374
|
case 3: return R.string.color_green3;
|
|
375
|
case 4: return R.string.color_red3;
|
|
376
|
case 5: return R.string.color_orange3;
|
|
377
|
}
|
|
378
|
|
|
379
|
return -1;
|
|
380
|
}
|
|
381
|
|
|
382
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
383
|
|
|
384
|
private int getColorIndex4(int face)
|
|
385
|
{
|
|
386
|
switch(mFaceColors[face])
|
|
387
|
{
|
|
388
|
case 0: return R.string.color_yellow4;
|
|
389
|
case 1: return R.string.color_white4;
|
|
390
|
case 2: return R.string.color_blue4;
|
|
391
|
case 3: return R.string.color_green4;
|
|
392
|
case 4: return R.string.color_red4;
|
|
393
|
case 5: return R.string.color_orange4;
|
|
394
|
}
|
|
395
|
|
|
396
|
return -1;
|
|
397
|
}
|
|
398
|
|
|
399
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
400
|
|
|
401
|
private String cornerError(Resources res, int face0, int face1, int face2)
|
|
402
|
{
|
|
403
|
int j0 = getColorIndex3(face0);
|
|
404
|
int j1 = getColorIndex3(face1);
|
|
405
|
int j2 = getColorIndex4(face2);
|
|
406
|
|
|
407
|
String c0 = res.getString(j0);
|
|
408
|
String c1 = res.getString(j1);
|
|
409
|
String c2 = res.getString(j2);
|
|
410
|
|
|
411
|
return res.getString(R.string.solver_generic_missing_corner,c0,c1,c2);
|
|
412
|
}
|
|
413
|
|
|
414
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
415
|
|
|
416
|
private String centerError(Resources res, int face)
|
|
417
|
{
|
|
418
|
int color = getColorIndex2(face);
|
|
419
|
String clr= res.getString(color);
|
|
420
|
return res.getString(R.string.solver_generic_missing_center,clr);
|
|
421
|
}
|
|
422
|
|
|
423
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
424
|
|
|
425
|
public String error(int index, Resources res)
|
|
426
|
{
|
|
427
|
switch(index)
|
|
428
|
{
|
|
429
|
case ERROR_CORNER_135_MISSING: return cornerError(res,1,3,5);
|
|
430
|
case ERROR_CORNER_134_MISSING: return cornerError(res,1,3,4);
|
|
431
|
case ERROR_CORNER_125_MISSING: return cornerError(res,1,2,5);
|
|
432
|
case ERROR_CORNER_124_MISSING: return cornerError(res,1,2,4);
|
|
433
|
case ERROR_CORNER_035_MISSING: return cornerError(res,0,3,5);
|
|
434
|
case ERROR_CORNER_034_MISSING: return cornerError(res,0,3,4);
|
|
435
|
case ERROR_CORNER_025_MISSING: return cornerError(res,0,2,5);
|
|
436
|
case ERROR_CORNER_024_MISSING: return cornerError(res,0,2,4);
|
|
437
|
|
|
438
|
case ERROR_CENTER_0_MISSING : return centerError(res,0);
|
|
439
|
case ERROR_CENTER_1_MISSING : return centerError(res,1);
|
|
440
|
case ERROR_CENTER_2_MISSING : return centerError(res,2);
|
|
441
|
case ERROR_CENTER_3_MISSING : return centerError(res,3);
|
|
442
|
case ERROR_CENTER_4_MISSING : return centerError(res,4);
|
|
443
|
case ERROR_CENTER_5_MISSING : return centerError(res,5);
|
|
444
|
|
|
445
|
case ERROR_CORNERS_CANNOT : return res.getString(R.string.solver_generic_corners_cannot);
|
|
446
|
case ERROR_CORNER_TWISTED : return res.getString(R.string.solver_generic_corner_twist);
|
|
447
|
case ERROR_TWO_CENTERS : return res.getString(R.string.solver_generic_two_centers);
|
|
448
|
case ERROR_TWO_CORNERS : return res.getString(R.string.solver_generic_two_corners);
|
|
449
|
}
|
|
450
|
|
|
451
|
return null;
|
|
452
|
}
|
|
453
|
|
|
454
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
455
|
|
|
456
|
public int[][] solution(int index, Resources res)
|
|
457
|
{
|
|
458
|
if( mSolver==null )
|
|
459
|
{
|
|
460
|
mSolver = ImplementedTablebasesList.createUnpacked(ObjectSignatures.SKEW_2);
|
|
461
|
|
|
462
|
if( mSolver!=null )
|
|
463
|
{
|
|
464
|
mSolver.createTablebase(-1);
|
|
465
|
mSolver.pack();
|
|
466
|
}
|
|
467
|
}
|
|
468
|
|
|
469
|
return mSolver!=null ? mSolver.solution(index,null) : null;
|
|
470
|
}
|
|
471
|
}
|
|
472
|
|