Facebook Tic-Tac-Toe tutorial

react-fb-tictactoe/src/TicTacToe/TicTacToe.css

@@ -48,3 +48,17 @@
 .game-info {
   margin-left: 20px;
 }
+
+
+.current-move {
+  font-weight: bold;
+}
+
+
+ul {
+  list-style: none;
+}
+
+.win {
+  background-color: PaleGreen;
+}

react-fb-tictactoe/src/TicTacToe/index.js

@@ -9,61 +9,165 @@ import './TicTacToe.css'
  *    with
  *    class Square extends Component
  */
-class Square extends Component {
-  render() {
-    return (
-      <button className="square">
-        {/* TODO */}
-      </button>
-    );
+function Square(props) {
+  let btnClass = 'square';
+  if(props.highlight) {
+    btnClass += ' win';
   }
+  return (
+    <button className={btnClass} onClick={props.onClick}>
+      {props.value}
+    </button>
+  );
 }
 
-class Board extends Component {
-  renderSquare(i) {
-    return <Square />;
-  }
 
-  render() {
-    const status = 'Next player: X';
+class Board extends React.Component {
 
+  renderSquare(i) {
+    const highlight = this.props.winner && this.props.winner.includes(i);
     return (
-      <div>
-        <div className="status">{status}</div>
-        <div className="board-row">
-          {this.renderSquare(0)}
-          {this.renderSquare(1)}
-          {this.renderSquare(2)}
-        </div>
-        <div className="board-row">
-          {this.renderSquare(3)}
-          {this.renderSquare(4)}
-          {this.renderSquare(5)}
-        </div>
-        <div className="board-row">
-          {this.renderSquare(6)}
-          {this.renderSquare(7)}
-          {this.renderSquare(8)}
-        </div>
-      </div>
+      <Square
+        value={this.props.squares[i]}
+        onClick={() => this.props.onClick(i)}
+        highlight={highlight}
+      />
     );
   }
+
+  render() {
+    let rows = [];
+    for(let i = 0; i < 3; i++) {
+      let columns = [];
+      for(let j = 0; j < 3; j++) {
+        columns.push(this.renderSquare(i * 3 + j))
+      }
+      rows.push(<div className="board-row">{columns}</div>)
+    }
+    return (<div>{rows}</div>);
+  }
 }
 
+
 class Game extends Component {
+  constructor() {
+    super();
+    this.state = {
+      history: [{
+        squares: Array(9).fill(null),
+        index: null,
+      }],
+      stepNumber: 0,
+      xIsNext: true,
+      reversedOrder: false,
+    };
+  }
+
+  handleClick(i) {
+    const history = this.state.history.slice(0, this.state.stepNumber + 1);
+    const current = history[history.length - 1];
+    const squares = current.squares.slice();
+    if (calculateWinner(squares) || squares[i]) {
+      return;
+    }
+    squares[i] = this.state.xIsNext ? 'X' : 'O';
+    this.setState({
+      history: history.concat([{
+        squares: squares,
+        index: i,
+      }]),
+      stepNumber: history.length,
+      xIsNext: !this.state.xIsNext,
+    });
+  }
+
+  handleSort() {
+    this.setState({
+      reversedOrder: !this.state.reversedOrder,
+    })
+  }
+
+
+  jumpTo(step) {
+    this.setState({
+      stepNumber: step,
+      xIsNext: (step % 2) === 0,
+    });
+  }
+
   render() {
+    const history = this.state.history;
+    const current = history[this.state.stepNumber];
+    const winner = calculateWinner(current.squares);
+
+
+    const moves = history.map((step, move) => {
+      const desc = move ?
+        move + '. Move ' + getCoordinates(step.index) :
+        'Game start';
+      const currentMoveClass = step == current ? 'current-move' : null;
+      return (
+        <li key={move} className={currentMoveClass}>
+          <a href="#" onClick={() => this.jumpTo(move)}>{desc}</a>
+        </li>
+      );
+    });
+
+
+    let status;
+    if (winner) {
+      status = 'Winner: ' + current.squares[winner[0]];
+    } else {
+      status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
+    }
+
     return (
       <div className="game">
         <div className="game-board">
-          <Board />
+          <Board
+            squares={current.squares}
+            onClick={(i) => this.handleClick(i)}
+            winner={winner}
+          />
         </div>
         <div className="game-info">
-          <div>{/* status */}</div>
-          <ol>{/* todo */}</ol>
+          <div>{status}</div>
+          <ul>
+            {this.state.reversedOrder ? moves.reverse() : moves}
+          </ul>
+          <button onClick={() => this.handleSort()}>Sort moves</button>
         </div>
       </div>
     );
   }
 }
 
 export default Game;
+
+
+function getCoordinates(index) {
+  let x = index % 3;
+  let y = Math.floor(index / 3);
+  return `(${x}, ${y})`;
+}
+
+
+function calculateWinner(squares) {
+  const lines = [
+    [0, 1, 2],
+    [3, 4, 5],
+    [6, 7, 8],
+    [0, 3, 6],
+    [1, 4, 7],
+    [2, 5, 8],
+    [0, 4, 8],
+    [2, 4, 6],
+  ];
+  for (let i = 0; i < lines.length; i++) {
+    const [a, b, c] = lines[i];
+    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
+      return lines[i];
+    }
+  }
+  return null;
+}