+const Team = {
+ X: 0,
+ O: 1,
+ properties: {
+ 0: {name: "X"},
+ 1: {name: "O"}
+ }
+};
+
function undisplay(element) {
element.style.display="none";
}
message_area.insertAdjacentHTML('beforeend', message);
}
+/*********************************************************
+ * Handling server-sent event stream *
+ *********************************************************/
+
const events = new EventSource("events");
events.onerror = function(event) {
}
};
+events.addEventListener("game-info", event => {
+ const info = JSON.parse(event.data);
+
+ window.game.set_game_info(info);
+});
+
+events.addEventListener("player-info", event => {
+ const info = JSON.parse(event.data);
+
+ window.game.set_player_info(info);
+});
+
+events.addEventListener("player-enter", event => {
+ const info = JSON.parse(event.data);
+
+ window.game.set_other_player_info(info);
+});
+
+events.addEventListener("player-update", event => {
+ const info = JSON.parse(event.data);
+
+ if (info.id === window.game.state.player_info.id)
+ window.game.set_player_info(info);
+ else
+ window.game.set_other_player_info(info);
+});
+
events.addEventListener("move", event => {
- const square = JSON.parse(event.data);
+ const move = JSON.parse(event.data);
- window.game.receiveMove(square);
+ window.game.receive_move(move);
});
events.addEventListener("game-state", event => {
const state = JSON.parse(event.data);
- window.game.resetState();
+ window.game.reset_board();
for (let square of state.moves) {
- window.game.receiveMove(square);
+ window.game.receive_move(square);
}
});
+/*********************************************************
+ * Game and supporting classes *
+ *********************************************************/
+
+function GameInfo(props) {
+ if (! props.id)
+ return null;
+
+ return (
+ <div className="game-info">
+ <h2>{props.id}</h2>
+ Invite a friend to play by sending this URL: {props.url}
+ </div>
+ );
+}
+
+function TeamButton(props) {
+ return <button className="inline"
+ onClick={() => props.game.join_team(props.team)}>
+ {props.label}
+ </button>;
+}
+
+function TeamChoices(props) {
+ let other_team;
+ if (props.player.team === "X")
+ other_team = "O";
+ else
+ other_team = "X";
+
+ if (props.player.team === "") {
+ if (props.first_move) {
+ return null;
+ } else {
+ return [
+ <TeamButton key="X" game={props.game} team="X" label="Join X" />,
+ " ",
+ <TeamButton key="O" game={props.game} team="O" label="Join O" />
+ ];
+ }
+ } else {
+ return <TeamButton game={props.game} team={other_team} label="Switch" />;
+ }
+}
+
+function PlayerInfo(props) {
+ if (! props.player.id)
+ return null;
+
+ const choices = <TeamChoices
+ game={props.game}
+ first_move={props.first_move}
+ player={props.player}
+ />;
+
+ return (
+ <div className="player-info">
+ <h2>Players</h2>
+ {props.player.name}
+ {props.player.team ? ` (${props.player.team})` : ""}
+ {props.first_move ? "" : " "}
+ {choices}
+ {props.other_players.map(other => (
+ <span key={other.id}>
+ {", "}
+ {other.name}
+ {other.team ? ` (${other.team})` : ""}
+ </span>
+ ))}
+ </div>
+ );
+}
+
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) {
+ render_square(i) {
+ const value = this.props.squares[i];
return (
<Square
- value={this.props.squares[i]}
+ value={value}
+ active={this.props.active && ! value}
onClick={() => this.props.onClick(i)}
/>
);
return (
<div>
<div className="board-row">
- {this.renderSquare(0)}
- {this.renderSquare(1)}
- {this.renderSquare(2)}
+ {this.render_square(0)}
+ {this.render_square(1)}
+ {this.render_square(2)}
</div>
<div className="board-row">
- {this.renderSquare(3)}
- {this.renderSquare(4)}
- {this.renderSquare(5)}
+ {this.render_square(3)}
+ {this.render_square(4)}
+ {this.render_square(5)}
</div>
<div className="board-row">
- {this.renderSquare(6)}
- {this.renderSquare(7)}
- {this.renderSquare(8)}
+ {this.render_square(6)}
+ {this.render_square(7)}
+ {this.render_square(8)}
</div>
</div>
);
}
}
-function fetch_post_json(api = '', data = {}) {
+function fetch_method_json(method, api = '', data = {}) {
const response = fetch(api, {
- method: 'POST',
+ method: method,
headers: {
'Content-Type': 'application/json'
},
return response;
}
+function fetch_post_json(api = '', data = {}) {
+ return fetch_method_json('POST', api, data);
+}
+
+async function fetch_put_json(api = '', data = {}) {
+ return fetch_method_json('PUT', api, data);
+}
+
class Game extends React.Component {
constructor(props) {
super(props);
this.state = {
+ game_info: {},
+ player_info: {},
+ other_players: [],
history: [
{
squares: Array(9).fill(null)
}
],
- stepNumber: 0,
- xIsNext: true
+ step_number: 0,
+ next_to_play: Team.X
};
}
- sendMove(i) {
- return fetch_post_json("move", { move: i });
+ set_game_info(info) {
+ this.setState({
+ game_info: info
+ });
}
- resetState() {
+ set_player_info(info) {
+ this.setState({
+ player_info: info
+ });
+ }
+
+ set_other_player_info(info) {
+ const other_players_copy = [...this.state.other_players];
+ const idx = other_players_copy.findIndex(o => o.id === info.id);
+ if (idx >= 0) {
+ other_players_copy[idx] = info;
+ } else {
+ other_players_copy.push(info);
+ }
+ this.setState({
+ other_players: other_players_copy
+ });
+ }
+
+ reset_board() {
this.setState({
history: [
{
squares: Array(9).fill(null)
}
],
- stepNumber: 0,
- xIsNext: true
+ step_number: 0,
+ next_to_play: Team.X
});
}
- receiveMove(i) {
- const history = this.state.history.slice(0, this.state.stepNumber + 1);
+ receive_move(i) {
+ const history = this.state.history.slice(0, this.state.step_number + 1);
const current = history[history.length - 1];
const squares = current.squares.slice();
- if (calculateWinner(squares) || squares[i]) {
+ if (calculate_winner(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([
{
squares: squares
}
]),
- stepNumber: history.length,
- xIsNext: !this.state.xIsNext
+ step_number: history.length,
+ next_to_play: next_to_play
});
}
- async handleClick(i) {
- const response = await this.sendMove(i);
+ async handle_click(i, first_move) {
+ let move = { move: i };
+ if (first_move) {
+ move.assert_first_move = true;
+ }
+ const response = await fetch_post_json("move", move);
if (response.status == 200) {
- const legal = await response.json();
- if (! legal)
- add_message("danger", `Illegal move.`);
+ 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
- });
+ join_team(team) {
+ fetch_put_json("player", {team: team});
}
render() {
- const history = this.state.history;
- const current = history[this.state.stepNumber];
- const winner = calculateWinner(current.squares);
+ const state = this.state;
+ const history = state.history;
+ const current = history[state.step_number];
+ const winner = calculate_winner(current.squares);
+ const first_move = state.step_number === 0;
+ const my_team = state.player_info.team;
+ var board_active;
let status;
- if (winner) {
- status = "Winner: " + winner;
- } else {
- status = "Next player: " + (this.state.xIsNext ? "X" : "O");
+ if (winner)
+ {
+ status = winner + " wins!";
+ if (state.player_info.team != "")
+ {
+ if (my_team === winner)
+ status += " Congratulations!";
+ else
+ status += " Better luck next time.";
+ }
+ board_active = false;
+ }
+ else if (first_move)
+ {
+ if (state.other_players.length == 0) {
+ status = "You can move or wait for another player to join.";
+ } else {
+ let qualifier;
+ if (state.other_players.length == 1) {
+ qualifier = "Either";
+ } else {
+ qualifier = "Any";
+ }
+ status = `${qualifier} player can make the first move.`;
+ }
+ board_active = true;
+ }
+ else if (my_team === "")
+ {
+ status = "You're just watching the game.";
+ board_active = false;
+ }
+ else if (my_team === Team.properties[state.next_to_play].name)
+ {
+ status = "Your turn. Make a move.";
+ board_active = true;
+ }
+ else
+ {
+ status = "Waiting for another player to ";
+ if (state.other_players.length == 0) {
+ status += "join.";
+ } else {
+ status += "move.";
+ }
+ board_active = false;
}
- return (
- <div className="game">
- <div className="game-info">
- <div>{status}</div>
- </div>
+ return [
+ <GameInfo
+ key="game-info"
+ id={state.game_info.id}
+ url={state.game_info.url}
+ />,
+ <PlayerInfo
+ key="player-info"
+ game={this}
+ first_move={first_move}
+ player={state.player_info}
+ other_players={state.other_players}
+ />,
+ <div key="game" className="game">
+ <div>{status}</div>
<div className="game-board">
<Board
+ active={board_active}
squares={current.squares}
- onClick={i => this.handleClick(i)}
+ onClick={i => this.handle_click(i, first_move)}
/>
</div>
</div>
- );
+ ];
}
}
-// ========================================
-
ReactDOM.render(<Game
ref={(me) => window.game = me}
/>, document.getElementById("tictactoe"));
-function calculateWinner(squares) {
+function calculate_winner(squares) {
const lines = [
[0, 1, 2],
[3, 4, 5],