Fix Shogi
[vchess.git] / client / src / variants / Atomic.js
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1import { ChessRules, PiPo } from "@/base_rules";
2
32f6285e 3export class AtomicRules extends ChessRules {
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4 getPotentialMovesFrom([x, y]) {
5 let moves = super.getPotentialMovesFrom([x, y]);
0c3fe8a6 6
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7 // Handle explosions
8 moves.forEach(m => {
8b405c81 9 // NOTE: if vanish.length==2 and appear.length==2, this is castle
6808d7a1 10 if (m.vanish.length > 1 && m.appear.length <= 1) {
8b405c81 11 // Explosion! (TODO?: drop moves which explode our king here)
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12 let steps = [
13 [-1, -1],
14 [-1, 0],
15 [-1, 1],
16 [0, -1],
17 [0, 1],
18 [1, -1],
19 [1, 0],
20 [1, 1]
21 ];
22 for (let step of steps) {
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23 let x = m.end.x + step[0];
24 let y = m.end.y + step[1];
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25 if (
26 V.OnBoard(x, y) &&
27 this.board[x][y] != V.EMPTY &&
28 this.getPiece(x, y) != V.PAWN
29 ) {
dac39588 30 m.vanish.push(
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31 new PiPo({
32 p: this.getPiece(x, y),
33 c: this.getColor(x, y),
34 x: x,
35 y: y
36 })
37 );
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38 }
39 }
6808d7a1 40 m.end = { x: m.appear[0].x, y: m.appear[0].y };
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41 m.appear.pop(); //Nothin appears in this case
42 }
43 });
0c3fe8a6 44
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45 return moves;
46 }
0c3fe8a6 47
6808d7a1 48 getPotentialKingMoves([x, y]) {
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49 // King cannot capture:
50 let moves = [];
51 const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
6808d7a1 52 for (let step of steps) {
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53 const i = x + step[0];
54 const j = y + step[1];
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55 if (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY)
56 moves.push(this.getBasicMove([x, y], [i, j]));
dac39588 57 }
6808d7a1 58 return moves.concat(this.getCastleMoves([x, y]));
dac39588 59 }
0c3fe8a6 60
68e19a44 61 isAttacked(sq, color) {
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62 if (
63 this.getPiece(sq[0], sq[1]) == V.KING &&
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64 this.isAttackedByKing(sq, color)
65 ) {
66 // A king next to the enemy king is immune to attacks
67 return false;
68 }
6808d7a1 69 return (
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70 this.isAttackedByPawn(sq, color) ||
71 this.isAttackedByRook(sq, color) ||
72 this.isAttackedByKnight(sq, color) ||
73 this.isAttackedByBishop(sq, color) ||
74 this.isAttackedByQueen(sq, color)
75 // No "attackedByKing": it cannot take
6808d7a1 76 );
dac39588 77 }
0c3fe8a6 78
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79 postPlay(move) {
80 super.postPlay(move);
6808d7a1 81 if (move.appear.length == 0) {
e9b736ee 82 // Capture
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83 const firstRank = { w: 7, b: 0 };
84 for (let c of ["w", "b"]) {
dac39588 85 // Did we explode king of color c ? (TODO: remove move earlier)
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86 if (
87 Math.abs(this.kingPos[c][0] - move.end.x) <= 1 &&
88 Math.abs(this.kingPos[c][1] - move.end.y) <= 1
89 ) {
90 this.kingPos[c] = [-1, -1];
3a2a7b5f 91 this.castleFlags[c] = [8, 8];
6808d7a1 92 } else {
dac39588 93 // Now check if init rook(s) exploded
6808d7a1 94 if (Math.abs(move.end.x - firstRank[c]) <= 1) {
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95 if (Math.abs(move.end.y - this.castleFlags[c][0]) <= 1)
96 this.castleFlags[c][0] = 8;
97 if (Math.abs(move.end.y - this.castleFlags[c][1]) <= 1)
98 this.castleFlags[c][1] = 8;
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99 }
100 }
101 }
102 }
103 }
0c3fe8a6 104
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105 postUndo(move) {
106 super.postUndo(move);
107 const c = this.turn;
dac39588 108 const oppCol = V.GetOppCol(c);
3a2a7b5f 109 if ([this.kingPos[c][0], this.kingPos[oppCol][0]].some(e => e < 0)) {
dac39588 110 // There is a chance that last move blowed some king away..
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111 for (let psq of move.vanish) {
112 if (psq.p == "k")
113 this.kingPos[psq.c == c ? c : oppCol] = [psq.x, psq.y];
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114 }
115 }
116 }
0c3fe8a6 117
6808d7a1 118 underCheck(color) {
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119 const oppCol = V.GetOppCol(color);
120 let res = undefined;
121 // If our king disappeared, move is not valid
6808d7a1 122 if (this.kingPos[color][0] < 0) res = true;
dac39588 123 // If opponent king disappeared, move is valid
6808d7a1 124 else if (this.kingPos[oppCol][0] < 0) res = false;
dac39588 125 // Otherwise, if we remain under check, move is not valid
68e19a44 126 else res = this.isAttacked(this.kingPos[color], oppCol);
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127 return res;
128 }
0c3fe8a6 129
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130 getCheckSquares() {
131 const color = this.turn;
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132 let res = [];
133 if (
134 this.kingPos[color][0] >= 0 && //king might have exploded
68e19a44 135 this.isAttacked(this.kingPos[color], V.GetOppCol(color))
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136 ) {
137 res = [JSON.parse(JSON.stringify(this.kingPos[color]))];
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138 }
139 return res;
140 }
0c3fe8a6 141
6808d7a1 142 getCurrentScore() {
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143 const color = this.turn;
144 const kp = this.kingPos[color];
6808d7a1 145 if (kp[0] < 0)
e9b736ee 146 // King disappeared
dac39588 147 return color == "w" ? "0-1" : "1-0";
bb688df5 148 if (this.atLeastOneMove()) return "*";
68e19a44 149 if (!this.isAttacked(kp, V.GetOppCol(color))) return "1/2";
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150 return color == "w" ? "0-1" : "1-0"; //checkmate
151 }
6808d7a1 152};