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import { useState } from 'react';
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interface SquareProps {
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value: string | null,
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onSquareClick: () => void
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}
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function Square({ value, onSquareClick }: SquareProps) {
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return <button className="square" onClick={onSquareClick}>{value}</button>;
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}
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interface BoardProps {
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xIsNext: boolean,
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squares: Array<string | null>,
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onPlay: (array: Array<string | null>) => void,
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}
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function Board({ xIsNext, squares, onPlay }: BoardProps) {
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function handleClick(i: number) {
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if (squares[i] || calculateWinner(squares)) {
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return;
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}
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const nextSquares = squares.slice();
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if (xIsNext) {
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nextSquares[i] = "X";
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} else {
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nextSquares[i] = "O";
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}
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onPlay(nextSquares);
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}
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const winner = calculateWinner(squares);
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let status;
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if (winner) {
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status = "Winner: " + winner;
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} else {
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status = "Next player: " + (xIsNext ? "X" : "O");
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}
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return (
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<>
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<div className="status">{status}</div>
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<div className="board-row">
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<Square value={squares[0]} onSquareClick={() => handleClick(0)} />
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<Square value={squares[1]} onSquareClick={() => handleClick(1)} />
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<Square value={squares[2]} onSquareClick={() => handleClick(2)} />
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</div>
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<div className="board-row">
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<Square value={squares[3]} onSquareClick={() => handleClick(3)} />
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<Square value={squares[4]} onSquareClick={() => handleClick(4)} />
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<Square value={squares[5]} onSquareClick={() => handleClick(5)} />
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</div>
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<div className="board-row">
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<Square value={squares[6]} onSquareClick={() => handleClick(6)} />
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<Square value={squares[7]} onSquareClick={() => handleClick(7)} />
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<Square value={squares[8]} onSquareClick={() => handleClick(8)} />
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</div>
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</>
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);
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}
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export default function Game() {
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const [history, setHistory] = useState([Array(9).fill(null)]);
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const [currentMove, setCurrentMove] = useState(0);
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const xIsNext = currentMove % 2 === 0;
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const currentSquares: Array<string | null> = history[currentMove];
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function handlePlay(nextSquares: Array<string | null>) {
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const nextHistory = [...history.slice(0, currentMove + 1), nextSquares];
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setHistory(nextHistory);
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setCurrentMove(nextHistory.length - 1);
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}
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function jumpTo(nextMove: number) {
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setCurrentMove(nextMove);
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}
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const moves = history.map((squares, move) => {
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let description;
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if (move > 0) {
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description = 'Go to move #' + move;
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} else {
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description = 'Go to game start';
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}
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return (
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<li key={move}>
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<button onClick={() => jumpTo(move)}>{description}</button>
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</li>
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);
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});
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return (
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<div className="game">
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<div className="game-board">
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<Board xIsNext={xIsNext} squares={currentSquares} onPlay={handlePlay} />
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</div>
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<div className="game-info">
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<ol>{moves}</ol>
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</div>
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</div>
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);
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}
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function calculateWinner(squares: Array<string | null>) {
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const lines = [
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[0, 1, 2],
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[3, 4, 5],
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[6, 7, 8],
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[0, 3, 6],
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[1, 4, 7],
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[2, 5, 8],
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[0, 4, 8],
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[2, 4, 6]
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];
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for (let i = 0; i < lines.length; i++) {
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const [a, b, c] = lines[i];
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if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
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return squares[a];
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}
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}
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return null;
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}
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