Add an enum (or an enum-like object) for Team values

[lmno.games] / tictactoe / tictactoe.jsx

diff --git a/tictactoe/tictactoe.jsx b/tictactoe/tictactoe.jsx
index eff7eff32f6df572437130d0ec2c0e8ecf8c2a7b..42c32ef29041345a03d2ca2ddb7ae5cbea5fd2c2 100644 (file)
--- a/tictactoe/tictactoe.jsx
+++ b/tictactoe/tictactoe.jsx
@@ -1,16 +1,75 @@
+const Team = {
+  X: 0,
+  O: 1,
+  properties: {
+    0: {name: "X"},
+    1: {name: "O"}
+  }
+};
+
+function undisplay(element) {
+  element.style.display="none";
+}
+
+function add_message(severity, message) {
+  message = `<div class="message ${severity}" onclick="undisplay(this)">
+<span class="hide-button" onclick="undisplay(this.parentElement)">&times;</span>
+${message}
+</div>`;
+  const message_area = document.getElementById('message-area');
+  message_area.insertAdjacentHTML('beforeend', message);
+}
+
+const events = new EventSource("events");
+
+events.onerror = function(event) {
+  if (event.target.readyState === EventSource.CLOSED) {
+      add_message("danger", "Connection to server lost.");
+  }
+};
+
+events.addEventListener("move", event => {
+  const move = JSON.parse(event.data);
+
+  window.game.receiveMove(move);
+});
+
+events.addEventListener("game-state", event => {
+  const state = JSON.parse(event.data);
+
+  window.game.resetState();
+
+  for (let square of state.moves) {
+    window.game.receiveMove(square);
+  }
+});
+
 function Square(props) {
+  let className = "square";
+
+  if (props.value) {
+    className += " occupied";
+  } else if (props.active) {
+    className += " open";
+  }
+
+  const onClick = props.active ? props.onClick : null;
+
   return (
-    <button className="square" onClick={props.onClick}>
+    <div className={className}
+         onClick={onClick}>
       {props.value}
-    </button>
+    </div>
   );
 }
 
 class Board extends React.Component {
   renderSquare(i) {
+    const value = this.props.squares[i];
     return (
       <Square
-        value={this.props.squares[i]}
+        value={value}
+        active={! this.props.gameOver && ! value}
         onClick={() => this.props.onClick(i)}
       />
     );
@@ -39,6 +98,17 @@ class Board extends React.Component {
   }
 }
 
+function fetch_post_json(api = '', data = {}) {
+  const response = fetch(api, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify(data)
+  });
+  return response;
+}
+
 class Game extends React.Component {
   constructor(props) {
     super(props);
@@ -49,18 +119,39 @@ class Game extends React.Component {
         }
       ],
       stepNumber: 0,
-      xIsNext: true
+      next_to_play: Team.X
     };
   }
 
-  handleClick(i) {
+  sendMove(i) {
+    return fetch_post_json("move", { move: i });
+  }
+
+  resetState() {
+    this.setState({
+      history: [
+        {
+          squares: Array(9).fill(null)
+        }
+      ],
+      stepNumber: 0,
+      next_to_play: Team.X
+    });
+  }
+
+  receiveMove(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";
+    squares[i] = Team.properties[this.state.next_to_play].name;
+    let next_to_play;
+    if (this.state.next_to_play === Team.X)
+      next_to_play = Team.O;
+    else
+      next_to_play = Team.X;
     this.setState({
       history: history.concat([
         {
@@ -68,14 +159,25 @@ class Game extends React.Component {
         }
       ]),
       stepNumber: history.length,
-      xIsNext: !this.state.xIsNext
+      next_to_play: next_to_play
     });
   }
 
+  async handleClick(i) {
+    const response = await this.sendMove(i);
+    if (response.status == 200) {
+      const result = await response.json();
+      if (! result.legal)
+        add_message("danger", result.message);
+    } else {
+      add_message("danger", `Error occurred sending move`);
+    }
+  }
+
   jumpTo(step) {
     this.setState({
       stepNumber: step,
-      xIsNext: (step % 2) === 0
+      next_to_play: (step % 2) === 0
     });
   }
 
@@ -84,36 +186,25 @@ class Game extends React.Component {
     const current = history[this.state.stepNumber];
     const winner = calculateWinner(current.squares);
 
-    const moves = history.map((step, move) => {
-      const desc = move ?
-        'Go to move #' + move :
-        'Go to game start';
-      return (
-        <li key={move}>
-          <button onClick={() => this.jumpTo(move)}>{desc}</button>
-        </li>
-      );
-    });
-
     let status;
     if (winner) {
       status = "Winner: " + winner;
     } else {
-      status = "Next player: " + (this.state.xIsNext ? "X" : "O");
+      status = "Next player: " + (Team.properties[this.state.next_to_play].name);
     }
 
     return (
       <div className="game">
+        <div className="game-info">
+          <div>{status}</div>
+        </div>
         <div className="game-board">
           <Board
+            gameOver={winner}
             squares={current.squares}
             onClick={i => this.handleClick(i)}
           />
         </div>
-        <div className="game-info">
-          <div>{status}</div>
-          <ol>{moves}</ol>
-        </div>
       </div>
     );
   }
@@ -121,7 +212,9 @@ class Game extends React.Component {
 
 // ========================================
 
-ReactDOM.render(<Game />, document.getElementById("tictactoe"));
+ReactDOM.render(<Game
+                  ref={(me) => window.game = me}
+                />, document.getElementById("tictactoe"));
 
 function calculateWinner(squares) {
   const lines = [