first commit

components/draughts/game/computer/worker.js

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+import { ComputerDifficulty } from '../../settings/constants/computer-difficulty';
+import { alphaBetaMove } from '@draughts/computer';
+import { Board } from '@draughts/core';
+
+const getRandomMove = (board) => {
+  return board.moves.at(Math.floor(Math.random() * board.moves.length));
+};
+
+const getComputerMove = (board, difficulty) => {
+  if (difficulty === ComputerDifficulty.MEDIUM) {
+    return alphaBetaMove(board, 3);
+  }
+  if (difficulty === ComputerDifficulty.HARD) {
+    return alphaBetaMove(board, 6);
+  }
+  return getRandomMove(board);
+};
+
+const getComputerTimeout = (board) => {
+  return 200 + board.moves.length * Math.floor(Math.random() * 200);
+};
+
+addEventListener('message', (event) => {
+  const startTime = Date.now();
+
+  const board = new Board(
+    event.data.board.position,
+    event.data.board.playerToMove,
+    event.data.board.firstMove
+  );
+  const move = getComputerMove(board, event.data.computerDifficulty);
+
+  const endTime = Date.now();
+  const elapsedTime = startTime - endTime;
+  const waitTime = Math.max(0, getComputerTimeout(board) - elapsedTime);
+
+  setTimeout(() => {
+    postMessage(move);
+  }, waitTime);
+});