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[vchess.git] / public / javascripts / variants / Antiking.js

class AntikingRules extends ChessRules
{
	static getPpath(b)
	{
		return b[1]=='a' ? "Antiking/"+b : b;
	}

	static get ANTIKING() { return 'a'; }

	static get PIECES()
	{
		return ChessRules.PIECES.concat([V.ANTIKING]);
	}

	setOtherVariables(fen)
	{
		super.setOtherVariables(fen);
		this.antikingPos = {'w':[-1,-1], 'b':[-1,-1]};
		const rows = V.ParseFen(fen).position.split("/");
		for (let i=0; i<rows.length; i++)
		{
			let k = 0;
			for (let j=0; j<rows[i].length; j++)
			{
				switch (rows[i].charAt(j))
				{
					case 'a':
						this.antikingPos['b'] = [i,k];
						break;
					case 'A':
						this.antikingPos['w'] = [i,k];
						break;
					default:
						const num = parseInt(rows[i].charAt(j));
						if (!isNaN(num))
							k += (num-1);
				}
				k++;
			}
		}
	}

	canTake([x1,y1], [x2,y2])
	{
		const piece1 = this.getPiece(x1,y1);
		const piece2 = this.getPiece(x2,y2);
		const color1 = this.getColor(x1,y1);
		const color2 = this.getColor(x2,y2);
		return piece2 != "a" &&
			((piece1 != "a" && color1 != color2) || (piece1 == "a" && color1 == color2));
	}

	getPotentialMovesFrom([x,y])
	{
		switch (this.getPiece(x,y))
		{
			case V.ANTIKING:
				return this.getPotentialAntikingMoves([x,y]);
			default:
				return super.getPotentialMovesFrom([x,y]);
		}
	}

	getPotentialAntikingMoves(sq)
	{
		return this.getSlideNJumpMoves(sq,
			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
	}

	isAttacked(sq, colors)
	{
		return (super.isAttacked(sq, colors) || this.isAttackedByAntiking(sq, colors));
	}

	isAttackedByKing([x,y], colors)
	{
		if (this.getPiece(x,y) == V.ANTIKING)
			return false; //antiking is not attacked by king
		return this.isAttackedBySlideNJump([x,y], colors, V.KING,
			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
	}

	isAttackedByAntiking([x,y], colors)
	{
		if ([V.KING,V.ANTIKING].includes(this.getPiece(x,y)))
			return false; //(anti)king is not attacked by antiking
		return this.isAttackedBySlideNJump([x,y], colors, V.ANTIKING,
			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
	}

	underCheck(move)
	{
		const c = this.turn;
		const oppCol = this.getOppCol(c);
		this.play(move)
		let res = this.isAttacked(this.kingPos[c], [oppCol])
			|| !this.isAttacked(this.antikingPos[c], [oppCol]);
		this.undo(move);
		return res;
	}

	getCheckSquares(move)
	{
		let res = super.getCheckSquares(move);
		this.play(move);
		const c = this.turn;
		if (!this.isAttacked(this.antikingPos[c], [this.getOppCol(c)]))
			res.push(JSON.parse(JSON.stringify(this.antikingPos[c])));
		this.undo(move);
		return res;
	}

	updateVariables(move)
	{
		super.updateVariables(move);
		const piece = this.getPiece(move.start.x,move.start.y);
		const c = this.getColor(move.start.x,move.start.y);
		// Update antiking position
		if (piece == V.ANTIKING)
		{
			this.antikingPos[c][0] = move.appear[0].x;
			this.antikingPos[c][1] = move.appear[0].y;
		}
	}

	unupdateVariables(move)
	{
		super.unupdateVariables(move);
		const c = this.getColor(move.start.x,move.start.y);
		if (this.getPiece(move.start.x,move.start.y) == V.ANTIKING)
			this.antikingPos[c] = [move.start.x, move.start.y];
	}

	checkGameEnd()
	{
		const color = this.turn;
		const oppCol = this.getOppCol(color);
		if (!this.isAttacked(this.kingPos[color], [oppCol])
			&& this.isAttacked(this.antikingPos[color], [oppCol]))
		{
			return "1/2";
		}
		return color == "w" ? "0-1" : "1-0";
	}

	static get VALUES() {
		return Object.assign(
			ChessRules.VALUES,
			{ 'a': 1000 }
		);
	}

	static GenRandInitFen()
	{
		let pieces = { "w": new Array(8), "b": new Array(8) };
		let antikingPos = { "w": -1, "b": -1 };
		for (let c of ["w","b"])
		{
			let positions = _.range(8);

			// Get random squares for bishops, but avoid corners; because,
			// if an antiking blocks a cornered bishop, it can never be checkmated
			let randIndex = 2 * _.random(1,3);
			const bishop1Pos = positions[randIndex];
			let randIndex_tmp = 2 * _.random(2) + 1;
			const bishop2Pos = positions[randIndex_tmp];
			positions.splice(Math.max(randIndex,randIndex_tmp), 1);
			positions.splice(Math.min(randIndex,randIndex_tmp), 1);

			randIndex = _.random(5);
			const knight1Pos = positions[randIndex];
			positions.splice(randIndex, 1);
			randIndex = _.random(4);
			const knight2Pos = positions[randIndex];
			positions.splice(randIndex, 1);

			randIndex = _.random(3);
			const queenPos = positions[randIndex];
			positions.splice(randIndex, 1);

			const rook1Pos = positions[0];
			const kingPos = positions[1];
			const rook2Pos = positions[2];

			// Random squares for antikings
			antikingPos[c] = _.random(7);

			pieces[c][rook1Pos] = 'r';
			pieces[c][knight1Pos] = 'n';
			pieces[c][bishop1Pos] = 'b';
			pieces[c][queenPos] = 'q';
			pieces[c][kingPos] = 'k';
			pieces[c][bishop2Pos] = 'b';
			pieces[c][knight2Pos] = 'n';
			pieces[c][rook2Pos] = 'r';
		}
		const ranks23_black = "pppppppp/" + (antikingPos["w"]>0?antikingPos["w"]:"")
			+ "A" + (antikingPos["w"]<7?7-antikingPos["w"]:"");
		const ranks23_white = (antikingPos["b"]>0?antikingPos["b"]:"") + "a"
			+ (antikingPos["b"]<7?7-antikingPos["b"]:"") + "/PPPPPPPP";
		return pieces["b"].join("") + "/" + ranks23_black +
			"/8/8/" +
			ranks23_white + "/" + pieces["w"].join("").toUpperCase() +
			" w 1111";
	}
}

const VariantRules = AntikingRules;