+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 ${severity}" onclick="undisplay(this)">
+<span class="hide-button" onclick="undisplay(this.parentElement)">×</span>
+${message}
+</div>`;
+ const message_area = document.getElementById('message-area');
+ message_area.insertAdjacentHTML('beforeend', message);
+}
+
+/*********************************************************
+ * Handling server-sent event stream *
+ *********************************************************/
+
+const events = new EventSource("events");
+
+events.onerror = function(event) {
+ if (event.target.readyState === EventSource.CLOSED) {
+ add_message("danger", "Connection to server lost.");
+ }
+};
+
+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_opponent_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_opponent_info(info);
+});
+
+events.addEventListener("move", event => {
+ const move = JSON.parse(event.data);
+
+ window.game.receive_move(move);
+});
+
+events.addEventListener("game-state", event => {
+ const state = JSON.parse(event.data);
+
+ window.game.reset_board();
+
+ for (let square of state.moves) {
+ 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 PlayerInfo(props) {
+ if (! props.player.id)
+ return null;
+
+ return (
+ <div className="player-info">
+ <h2>Players</h2>
+ {props.player.name}
+ {props.player.team ? ` (${props.player.team})` : ""}
+ {", "}
+ {props.opponent.name}
+ {props.opponent.team ? ` (${props.opponent.team})` : ""}
+ </div>
+ );
+}
+