apps/frontend/src/MancalaApp.tsx

@@ -6,7 +6,7 @@ import {
     Route,
 } from "react-router-dom";
 import FloatingPanel from './components/FloatingPanel';
-import GamePage from './routes/GamePage';
+import GameRoute from './routes/GamePage';
 import Home from './routes/Home';
 
 import { initContext } from './context/context';
@@ -127,7 +127,7 @@ const MancalaApp: FunctionComponent = () => {
                     <Route index element={<Home context={context} theme={theme} userKey={userKey} authUser={authUser} />} />
                     <Route path="/" >
                         <Route path="game" >
-                            <Route path=":gameId" element={<GamePage context={context} theme={theme} userKey={userKey} />}  ></Route>
+                            <Route path=":gameId" element={<GameRoute context={context} theme={theme} userKey={userKey} />}  ></Route>
                         </Route>
                         <Route path="loby" element={<LobyPage context={context} theme={theme} userKey={userKey} />}>
                         </Route>

apps/frontend/src/components/game/GameOverCard.tsx

@@ -1,32 +1,57 @@
 import * as React from "react";
 import { FunctionComponent } from "react";
 import { useTranslation } from "react-i18next";
-import { useNavigate } from "react-router-dom";
 import { CloseIcon } from "../Icons";
 
-// Over the board when a game ends: the result, why it ended, the score, and where to go next.
+// A player's stones at the end, for the score columns.
+export interface FinalScore {
+    name: string;
+    stones: number;
+    isWinner: boolean;
+    // The bottom player, whose wins are shown in the accent colour.
+    isBottom: boolean;
+}
+
+// Over the board when a game ends: the result, why it ended, the score as two columns (name above stones), the
+// series score, a line about a rematch, and the page's buttons.
 const GameOverCard: FunctionComponent<{
     title: string,
     reason?: string,
-    score: string,
-    // "New Game" unless given, e.g. "Play again" after a game against the bot.
-    newGameLabel?: string,
-    onNewGame: () => void,
+    // The bottom player's first.
+    scores: [FinalScore, FinalScore],
+    seriesScore?: string,
+    status?: string,
+    // The status is something being waited for.
+    waiting?: boolean,
+    children: React.ReactNode,
     onClose: () => void,
-}> = ({ title, reason, score, newGameLabel, onNewGame, onClose }) => {
+}> = ({ title, reason, scores, seriesScore, status, waiting, children, onClose }) => {
     const { t } = useTranslation();
-    const navigate = useNavigate();
+    const scoreColumn = (score: FinalScore) => (
+        <div className={"osc" + (score.isWinner ? " win" : "") + (score.isBottom ? " mine" : "")}>
+            <span className="oname" title={score.name}>{score.name}</span>
+            <span className="onum">{score.stones}</span>
+        </div>
+    );
     return (
         <div className="over">
             <div className="ocard" role="dialog" aria-label={title}>
                 <button className="btn icon ghost close" aria-label={t("Close")} onClick={onClose}><CloseIcon /></button>
                 <div className="otitle">{title}</div>
                 {reason && <div className="oreason">{reason}</div>}
-                <div className="oscore">{score}</div>
-                <div className="row">
-                    <button className="btn pri" onClick={onNewGame}>{newGameLabel ?? t("NewGame")}</button>
-                    <button className="btn ghost" onClick={() => navigate("/")}>{t("Home")}</button>
+                <div className="oscore" aria-label={`${t("Score")}: ${scores.map((s) => `${s.name} ${s.stones}`).join(", ")}`}>
+                    {scoreColumn(scores[0])}
+                    <span className="odash" aria-hidden="true">–</span>
+                    {scoreColumn(scores[1])}
                 </div>
+                {seriesScore && <div className="oseries">{seriesScore}</div>}
+                {status && (
+                    <div className={"ostatus" + (waiting ? " waiting" : "")} role="status">
+                        {waiting && <span className="dot" />}
+                        {status}
+                    </div>
+                )}
+                <div className="row">{children}</div>
             </div>
         </div>
     );

apps/frontend/src/routes/GamePage.tsx

@@ -10,6 +10,7 @@ import PageContainer from '../components/PageContainer';
 import AppHeader from '../components/headerbar/AppHeader';
 import { LeaveIcon, PlusIcon } from '../components/Icons';
 import { GameRecord, channel_on_game_update, channel_on_game_crashed, channel_on_game_end, channel_on_game_user_leave, channel_on_user_connection_change, channel_leave_game, channel_game_move, channel_listen_game_events, channel_unlisten_game_events, FinishedGameSummary, GameEndMessage, getBoardAfterMove, getSeat, PlayedMove, getHintsEnabled, setHintsEnabled, getMoveOutcome, explainMove } from '@mancala/core';
+import { channel_on_game_start, channel_rematch, channel_decline_rematch, channel_on_rematch_request, channel_on_rematch_ended, RematchRequest, RematchEnded, RematchEndReason, isSeriesOver } from '@mancala/core';
 import { Context } from '../context/context';
 import { GameMove, LoadingState, Game, GameUsersConnectionInfo } from "@mancala/core";
 import { Theme, getBotLevel, getPlayerDisplayName } from '@mancala/core';
@@ -31,6 +32,28 @@ import GameOverCard from '../components/game/GameOverCard';
 import RulesPanel from '../components/rules/RulesPanel';
 import '../styles/game.css';
 
+// Where a rematch of the ended game stands (docs/specs/rematch): none before the end, available to ask, waiting for
+// the opponent, requested by the opponent, or over (a player left, said no or looked for another game).
+type RematchStatus = "none" | "available" | "waiting" | "requested" | "over";
+
+interface RematchState {
+    status: RematchStatus;
+    // Translation key of what happened to the last request; worded with the opponent's name.
+    note?: string;
+}
+
+// What the player is told when a request ends; nothing when they ended it themselves.
+function getRematchNoteKey(status: RematchStatus, reason: RematchEndReason): string | undefined {
+    switch (reason) {
+        case "declined": return status === "waiting" ? "RematchDeclined" : undefined;
+        case "withdrawn": return status === "requested" ? "RematchWithdrawn" : undefined;
+        case "expired": return status === "waiting" ? "RematchNoAnswer" : status === "requested" ? "RematchRequestExpired" : undefined;
+        case "offline":
+        case "left": return status === "over" ? undefined : "RematchOpponentGone";
+        case "closed": return status === "over" ? undefined : "RematchClosed";
+    }
+}
+
 const GamePage: FunctionComponent<{
     context: Context,
     userKey?: string,
@@ -70,6 +93,8 @@ const GamePage: FunctionComponent<{
     // Set when the player closes the game over card to look at the board.
     const [gameOverClosed, setGameOverClosed] = useState<boolean>(false);
 
+    const [rematch, setRematch] = useState<RematchState>({ status: "none" });
+
     const navigate = useNavigate();
 
     const { t } = useTranslation();
@@ -123,6 +148,7 @@ const GamePage: FunctionComponent<{
     const onGameEnd = (message: GameEndMessage) => {
         setGameEnd(message);
         setHasOngoingAction(false);
+        setRematch({ status: message.rematch === "available" ? "available" : "over" });
     };
     const onUserConnectionChange = (message: any) => {
         const gameUsersConnectionInfo = message as GameUsersConnectionInfo;
@@ -131,12 +157,35 @@ const GamePage: FunctionComponent<{
 
     const listenMessages = (game: Game, pitAnimator: PitAnimator): () => void => {
         const _onGameUpdate = (message: object) => onGameUpdateEvent(pitAnimator, message);
+        // The opponent asked for a rematch; the card comes back if it was closed.
+        const onRematchRequest = (message: RematchRequest) => {
+            if (message.gameId !== game.id) return;
+            setRematch({ status: "requested" });
+            setGameOverClosed(false);
+        };
+        const onRematchEnded = (message: RematchEnded) => {
+            if (message.gameId !== game.id) return;
+            setRematch((rematch) => ({
+                status: isSeriesOver(message.reason) ? "over" : "available",
+                note: getRematchNoteKey(rematch.status, message.reason),
+            }));
+        };
+        // The server sends a player's new game only to them: here, the rematch both have asked for.
+        const onGameStart = (message: Game) => {
+            if (message.id !== game.id) navigate(`/game/${message.id}`);
+        };
         context.rtmt.addMessageListener(channel_on_game_update, _onGameUpdate);
         context.rtmt.addMessageListener(channel_on_game_crashed, onGameCrashed);
         context.rtmt.addMessageListener(channel_on_game_user_leave, onGameUserLeave);
         context.rtmt.addMessageListener(channel_on_user_connection_change, onUserConnectionChange);
         context.rtmt.addMessageListener(channel_on_game_end, onGameEnd);
+        context.rtmt.addMessageListener(channel_on_rematch_request, onRematchRequest);
+        context.rtmt.addMessageListener(channel_on_rematch_ended, onRematchEnded);
+        context.rtmt.addMessageListener(channel_on_game_start, onGameStart);
         return () => {
+            context.rtmt.removeMessageListener(channel_on_rematch_request, onRematchRequest);
+            context.rtmt.removeMessageListener(channel_on_rematch_ended, onRematchEnded);
+            context.rtmt.removeMessageListener(channel_on_game_start, onGameStart);
             context.rtmt.removeMessageListener(channel_on_game_end, onGameEnd);
             context.rtmt.removeMessageListener(channel_on_game_update, _onGameUpdate);
             context.rtmt.removeMessageListener(channel_on_game_crashed, onGameCrashed);
@@ -199,11 +248,26 @@ const GamePage: FunctionComponent<{
     // In a game against the bot, the game over card starts another one at the same level.
     const opponentBotLevel = isSpectator ? undefined : getBotLevel(getOpponentId());
 
+    // Once a rematch of a bot game is no longer possible, "Play again" starts a new game at the same level.
     const onPlayAgainClick = () => {
         if (Util.checkConnectionAndMaybeAlert(context, t)) return;
         navigate(`/loby?bot=${opponentBotLevel}`)
     };
 
+    // Asks for a rematch, or accepts the opponent's request; the bot accepts at once.
+    const onRematchClick = () => {
+        if (!game || Util.checkConnectionAndMaybeAlert(context, t)) return;
+        context.rtmt.sendMessage(channel_rematch, { gameId: game.id });
+        setRematch({ status: "waiting" });
+    };
+
+    // Withdraws the player's request, or says no to the opponent's, which ends the series.
+    const onDeclineRematchClick = () => {
+        if (!game || Util.checkConnectionAndMaybeAlert(context, t)) return;
+        context.rtmt.sendMessage(channel_decline_rematch, { gameId: game.id });
+        setRematch({ status: rematch.status === "waiting" ? "available" : "over" });
+    };
+
     const onPitSelect = (index: number, pit: Pit) => {
         if (!game || isSpectator || !userKey) {
             return;
@@ -373,6 +437,45 @@ const GamePage: FunctionComponent<{
         return <ReplayView context={context} theme={theme} record={replayRecord} userKey={userKey} />;
     }
 
+    const winnerSeat = endSummary?.result === "player1" || endSummary?.result === "player2" ? endSummary.result : undefined;
+
+    const getRematchStatusText = (): string | undefined => {
+        if (isSpectator) return undefined;
+        const name = topLocatedUser.name;
+        if (rematch.status === "waiting" && !opponentBotLevel) return t("RematchWaiting", { name });
+        if (rematch.status === "requested") return t("RematchRequested", { name });
+        return rematch.note && t(rematch.note, { name });
+    };
+
+    const renderGameOverButtons = () => {
+        const newGame = (primary: boolean) => (
+            <button key="new" className={"btn " + (primary ? "pri" : "ghost")} onClick={onNewGameClick}>{t("NewGame")}</button>
+        );
+        const home = <button key="home" className="btn ghost" onClick={() => navigate("/")}>{t("Home")}</button>;
+        if (isSpectator) return [newGame(true), home];
+        if (opponentBotLevel) {
+            const canRematch = rematch.status === "available" || rematch.status === "waiting";
+            return [
+                <button key="again" className="btn pri" disabled={rematch.status === "waiting"}
+                    onClick={canRematch ? onRematchClick : onPlayAgainClick}>{t("PlayAgain")}</button>,
+                home,
+            ];
+        }
+        switch (rematch.status) {
+            case "available":
+                return [<button key="rematch" className="btn pri" onClick={onRematchClick}>{t("Rematch")}</button>, newGame(false), home];
+            case "waiting":
+                return [<button key="cancel" className="btn ghost" onClick={onDeclineRematchClick}>{t("Cancel")}</button>, home];
+            case "requested":
+                return [
+                    <button key="rematch" className="btn pri" onClick={onRematchClick}>{t("Rematch")}</button>,
+                    <button key="no" className="btn ghost" onClick={onDeclineRematchClick}>{t("No")}</button>,
+                ];
+            default:
+                return [newGame(true), home];
+        }
+    };
+
     const getTurnText = () => {
         if (isGameOver) return resultTitle ? `${t("GameEnded")} · ${resultTitle}` : t("GameEnded");
         if (isSpectator) return `${getPlayerName(mancalaGame!.turnPlayerId) ?? t("Anonymous")} ${t("Playing")}`;
@@ -434,10 +537,15 @@ const GamePage: FunctionComponent<{
                         <GameOverCard
                             title={resultTitle ?? t("GameEnded")}
                             reason={resultReason}
-                            score={`${bottomLocatedUser.name} ${board.pits[bottomStore].stoneCount} – ${board.pits[topStore].stoneCount} ${topLocatedUser.name}`}
-                            newGameLabel={opponentBotLevel ? t("PlayAgain") : undefined}
-                            onNewGame={opponentBotLevel ? onPlayAgainClick : onNewGameClick}
-                            onClose={() => setGameOverClosed(true)} />
+                            scores={[
+                                { name: bottomLocatedUser.name, stones: board.pits[bottomStore].stoneCount, isWinner: winnerSeat === getSeat(mancalaGame!, bottomLocatedUserId), isBottom: true },
+                                { name: topLocatedUser.name, stones: board.pits[topStore].stoneCount, isWinner: winnerSeat === getSeat(mancalaGame!, topLocatedUserId), isBottom: false },
+                            ]}
+                            status={getRematchStatusText()}
+                            waiting={rematch.status === "waiting"}
+                            onClose={() => setGameOverClosed(true)}>
+                            {renderGameOverButtons()}
+                        </GameOverCard>
                     )}
                 </div>
                 <div className="a-moves">
@@ -477,4 +585,10 @@ const GamePage: FunctionComponent<{
     }
 }
 
-export default GamePage;
+// A page of its own for every game, so following a rematch to the new game's id starts the page afresh.
+const GameRoute: FunctionComponent<React.ComponentProps<typeof GamePage>> = (props) => {
+    const { gameId } = useParams<{ gameId: string }>();
+    return <GamePage key={gameId} {...props} />;
+};
+
+export default GameRoute;

apps/frontend/src/styles/game.css

@@ -156,8 +156,19 @@
 .ocard .close { position: absolute; top: 8px; right: 8px; }
 .otitle { font-size: 30px; font-weight: 800; letter-spacing: -.02em; }
 .oreason { font-size: 15px; font-weight: 700; color: var(--muted); }
-.oscore { font-size: 18px; color: var(--muted); font-variant-numeric: tabular-nums; margin-bottom: 8px; }
-.ocard .row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
+/* The score: each player's name above their stones, the bottom player's on the left. */
+.oscore { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: end; gap: 0 14px; width: 100%; min-width: 220px; margin: 2px 0 4px; }
+.osc { display: flex; flex-direction: column; align-items: center; gap: 2px; min-width: 0; }
+.oname { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; font-weight: 700; color: var(--muted); }
+.onum { font-size: 38px; font-weight: 800; line-height: 1; letter-spacing: -.02em; color: var(--muted); font-variant-numeric: tabular-nums; }
+.osc:not(.win) .onum { opacity: .55; }
+.osc.win .onum { color: var(--ink); }
+.osc.win.mine .onum { color: var(--accent); }
+.odash { padding-bottom: 6px; font-size: 22px; font-weight: 700; color: var(--muted); }
+.oseries { font-size: 14px; font-weight: 700; color: var(--muted); font-variant-numeric: tabular-nums; }
+.ostatus { display: flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 700; }
+.ostatus.waiting { color: var(--muted); }
+.ocard .row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 6px; }
 
 /* Tags of a move: extra turn, capture, stones to the store */
 

docs/specs/rematch/tasks.md

@@ -10,7 +10,7 @@ Work through the tasks in order; each ends with its tests passing and a commit.
       `new_game`, `new_bot_game` and going offline, the bot accepting at once; unit tests.
 - [x] 4. **Saving**: `seriesId` in `GameRecord`, migration `004_series`, the repository; integration tests.
 - [x] 5. **Core**: channel names, types, `getSeriesScore`, texts in English and Turkish; unit tests.
-- [ ] 6. **Web app, rematch**: the game page following `on_game_start` (`key={gameId}`), the game over card's rematch
+- [x] 6. **Web app, rematch**: the game page following `on_game_start` (`key={gameId}`), the game over card's rematch
       states, "Play again" as a rematch, the score in two columns.
 - [ ] 7. **Web app, series strip**: `SeriesStrip`, the series score on the game over card, spectators.
 - [ ] 8. **End to end and docs**: the Chrome tests from `design.md`; `AGENTS.md` (the specs list, rematch notes),