123 lines
3.4 KiB
JavaScript
123 lines
3.4 KiB
JavaScript
import { Chessground } from "chessground";
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import { Chess } from "chess.js";
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export const ChessBoard = {
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mounted() {
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this.chess = new Chess();
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this.ground = Chessground(this.el, {
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fen: this.chess.fen(),
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movable: {
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color: "white",
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free: false,
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dests: this.getValidDests(),
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},
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events: {
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move: (orig, dest, _capturedPiece) => {
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this.handleMove(orig, dest);
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},
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},
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});
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this.handleEvent("set_fen", ({ fen }) => {
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try {
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this.chess.load(fen);
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const currentTurnColor = this.chess.turn() === "w" ? "white" : "black";
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this.ground.set({
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fen: fen,
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turnColor: currentTurnColor,
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movable: {
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color: currentTurnColor,
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dests: this.getValidDests(),
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},
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});
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} catch (error) {
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console.error("Invalid FEN string submitted:", error);
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alert("Invalid FEN configuration!");
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}
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});
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},
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getValidDests() {
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const dests = new Map();
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this.chess.moves({ verbose: true }).forEach((m) => {
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if (!dests.has(m.from)) dests.set(m.from, []);
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dests.get(m.from).push(m.to);
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});
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return dests;
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},
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handleMove(orig, dest) {
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const piece = this.ground.state.pieces.get(dest);
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const destRank = dest[1];
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if (piece?.role === "pawn" && (destRank === "1" || destRank === "8")) {
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this.showPromotionDialog(orig, dest);
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return; // don't execute yet — wait for user choice
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}
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this.executeMove(orig, dest);
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},
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showPromotionDialog(orig, dest) {
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this.pendingPromotion = { orig, dest };
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const color = this.chess.turn() === "w" ? "white" : "black";
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const overlay = document.createElement("div");
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overlay.className = "promotion-overlay";
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const picker = document.createElement("div");
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picker.className = "promotion-picker";
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const pieces = [
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{ type: "queen", code: "q" },
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{ type: "rook", code: "r" },
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{ type: "bishop", code: "b" },
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{ type: "knight", code: "n" },
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];
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pieces.forEach(({ type, code }) => {
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const btn = document.createElement("button");
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btn.className = `promotion-piece ${type} ${color}`;
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btn.addEventListener("click", () => this.completePromotion(code));
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picker.appendChild(btn);
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});
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overlay.appendChild(picker);
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const boardContainer = this.el.closest(".shadow-inner");
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boardContainer.style.position = "relative";
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boardContainer.appendChild(overlay);
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},
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completePromotion(pieceType) {
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const { orig, dest } = this.pendingPromotion;
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this.pendingPromotion = null;
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const picker = this.el.closest(".shadow-inner")?.querySelector(".promotion-overlay");
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if (picker) picker.remove();
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this.executeMove(orig, dest, pieceType);
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},
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executeMove(orig, dest, promotion) {
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const move = this.chess.move({ from: orig, to: dest, promotion });
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if (move) {
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this.pushEvent("move_played", {
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from: orig,
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to: dest,
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fen: this.chess.fen(),
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san: move.san,
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});
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const nextTurnColor = this.chess.turn() === "w" ? "white" : "black";
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this.ground.set({
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turnColor: nextTurnColor,
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fen: this.chess.fen(),
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movable: {
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color: nextTurnColor,
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dests: this.getValidDests(),
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},
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});
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} else {
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this.ground.set({ fen: this.chess.fen() });
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}
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},
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};
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