mancala/apps/frontend/src/routes/GamePage.tsx

import { MancalaGame, Pit } from 'mancala.js';
import * as React from 'react';
import { FunctionComponent, useState } from 'react';
import { useNavigate, useParams } from 'react-router';
import { v4 } from 'uuid';
import { PitAnimator } from '@mancala/core';
import BoardView from '../components/board/BoardView';
import LoadingComponent from '../components/LoadingComponent';
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 } from '@mancala/core';
import { Context } from '../context/context';
import { GameMove, LoadingState, Game, GameUsersConnectionInfo } from "@mancala/core";
import { Theme, getBotLevel, getPlayerDisplayName } from '@mancala/core';
import { BoardViewModel } from "@mancala/core";
import notyf from '../util/Notyf';
import swal from 'sweetalert';
import Util from '../util/Util';
import { useTranslation } from 'react-i18next';
import MoveList from '../components/history/MoveList';
import ReviewBanner from '../components/history/ReviewBanner';
import useMoveKeys from '../hooks/useMoveKeys';
import { createBoardViewModel } from '../util/BoardViewModels';
import { getResultText } from '../util/GameResultText';
import ReplayView from '../components/history/ReplayView';
import GameClockView from '../components/GameClockView';
import useGameClock from '../hooks/useGameClock';
import PlayerCard from '../components/game/PlayerCard';
import GameOverCard from '../components/game/GameOverCard';
import '../styles/game.css';

const GamePage: FunctionComponent<{
    context: Context,
    userKey?: string,
    theme: Theme,
}> = ({ context, userKey, theme }) => {
    let params = useParams<{ gameId: string }>();

    const [game, setGame] = useState<Game | undefined>(undefined);

    const [userKeyWhoLeave, setUserKeyWhoLeave] = useState<string | undefined>(undefined);

    const [boardViewModel, setBoardViewModel] = useState<BoardViewModel | undefined>(undefined);

    const [boardId, setBoardId] = useState<string>("-1");

    const [pitAnimator, setPitAnimator] = useState<PitAnimator | undefined>(undefined);

    // It is a flag for ongoing action such as send game move.
    // We have to block future actions if there is an ongoing action.
    const [hasOngoingAction, setHasOngoingAction] = useState<boolean>(false);

    const [gameUsersConnectionInfo, setGameUsersConnectionInfo] = useState<GameUsersConnectionInfo | undefined>();

    // Set while an earlier position is shown instead of the live board.
    const [viewedMove, setViewedMove] = useState<number | undefined>(undefined);

    // Set when the game has ended and was loaded from history; the page then shows the replay.
    const [replayRecord, setReplayRecord] = useState<GameRecord | undefined>(undefined);

    // Set when the server says the game ended, for whatever reason.
    const [gameEnd, setGameEnd] = useState<GameEndMessage | undefined>(undefined);

    // Set when the player closes the game over card to look at the board.
    const [gameOverClosed, setGameOverClosed] = useState<boolean>(false);

    const navigate = useNavigate();

    const { t } = useTranslation();

    const [gameLoadingState, setLoadingStateGame] = useState<LoadingState<Game>>(LoadingState.Unset());


    const checkIsSpectator = (game: Game) => userKey !== game.mancalaGame.player1Id && userKey !== game.mancalaGame.player2Id;

    const mancalaGame: MancalaGame | undefined = game?.mancalaGame;
    const isSpectator = game ? checkIsSpectator(game) : undefined;
    const isPlayer2 = !isSpectator && userKey === mancalaGame?.player2Id;

    const onGameUpdate = (pitAnimator: PitAnimator, newGame: Game) => {
        setGame(newGame);
        pitAnimator.setUpdatedGame(newGame);
        setHasOngoingAction(false);
        setGameUsersConnectionInfo(newGame.gameUsersConnectionInfo);
    }

    const isUserOnline = (userId: string) => {
        if (!gameUsersConnectionInfo) return false;
        const user1ConnectionInfo = gameUsersConnectionInfo.user1ConnectionInfo;
        const user2ConnectionInfo = gameUsersConnectionInfo.user2ConnectionInfo;
        if (user1ConnectionInfo.userId === userId) return user1ConnectionInfo.isOnline;
        if (user2ConnectionInfo.userId === userId) return user2ConnectionInfo.isOnline;
        return false;
    }

    const getPlayerName = (userId: string) => {
        const connectionInfos = [gameUsersConnectionInfo?.user1ConnectionInfo, gameUsersConnectionInfo?.user2ConnectionInfo];
        return getPlayerDisplayName(connectionInfos.find((info) => info?.userId === userId), t);
    }

    const onGameUpdateEvent = (pitAnimator: PitAnimator, message: Object) => {
        const newGame: Game = message as Game;
        newGame.mancalaGame = MancalaGame.createFromMancalaGame(newGame.mancalaGame);
        onGameUpdate(pitAnimator, newGame);
    }
    const onGameCrashed = (message: any) => {
        const newCrashMessage = message as string;
        notyf.error(t("InternalErrorOccurred"));
        console.error("on_game_crash");
        console.error(newCrashMessage);
    }
    const onGameUserLeave = (message: any) => {
        const userKeyWhoLeave = message;
        setUserKeyWhoLeave(userKeyWhoLeave);
        setHasOngoingAction(false);
    };
    const onGameEnd = (message: GameEndMessage) => {
        setGameEnd(message);
        setHasOngoingAction(false);
    };
    const onUserConnectionChange = (message: any) => {
        const gameUsersConnectionInfo = message as GameUsersConnectionInfo;
        setGameUsersConnectionInfo(gameUsersConnectionInfo);
    };

    const listenMessages = (game: Game, pitAnimator: PitAnimator): () => void => {
        const _onGameUpdate = (message: object) => onGameUpdateEvent(pitAnimator, message);
        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);
        return () => {
            context.rtmt.removeMessageListener(channel_on_game_end, onGameEnd);
            context.rtmt.removeMessageListener(channel_on_game_update, _onGameUpdate);
            context.rtmt.removeMessageListener(channel_on_game_crashed, onGameCrashed);
            context.rtmt.removeMessageListener(channel_on_game_user_leave, onGameUserLeave);
            context.rtmt.removeMessageListener(channel_on_user_connection_change, onUserConnectionChange);
        }
    };

    // Spectators tell the server they are watching once their identity is known and the connection is open,
    // and again after every reconnect, since the server forgets spectators who go offline.
    React.useEffect(() => {
        if (!game || !userKey || !checkIsSpectator(game)) return;
        const listen = () => context.rtmt.sendMessage(channel_listen_game_events, game.id);
        if (context.rtmt.connectionState === "connected") listen();
        context.rtmt.on("open", listen);
        return () => {
            context.rtmt.off("open", listen);
            if (context.rtmt.connectionState === "connected") context.rtmt.sendMessage(channel_unlisten_game_events, game.id);
        };
    }, [game?.id, userKey]);

    const updateBoardViewModel = (boardViewModel: BoardViewModel) => {
        boardViewModel.id = v4();
        setBoardId(boardViewModel.id);
        setBoardViewModel(boardViewModel);
    };

    const getBoardIndex = (index: number) => {
        if (!game || !mancalaGame) return -1;
        const pitsLenght = mancalaGame.board.pits.length;
        if (userKey === mancalaGame.player2Id) return index + pitsLenght / 2;
        return index;
    };

    const getOpponentId = () => mancalaGame?.player1Id === userKey ? mancalaGame?.player2Id : mancalaGame?.player1Id;

    const checkHasAnOngoingAction = () => hasOngoingAction;

    const onLeaveGameClick = () => {
        if (Util.checkConnectionAndMaybeAlert(context, t)) return;
        swal({
            title: t("AreYouSureToLeaveGame"),
            icon: "warning",
            buttons: [t("Cancel"), t("Yes")],
            dangerMode: true,
        })
            .then((confirm) => {
                if (confirm) {
                    context.rtmt.sendMessage(channel_leave_game, {});
                    navigate("/");
                }
            });
    };

    const onNewGameClick = () => {
        if (Util.checkConnectionAndMaybeAlert(context, t)) return;
        navigate("/loby")
    };

    // In a game against the bot, the game over card starts another one at the same level.
    const opponentBotLevel = isSpectator ? undefined : getBotLevel(getOpponentId());

    const onPlayAgainClick = () => {
        if (Util.checkConnectionAndMaybeAlert(context, t)) return;
        navigate(`/loby?bot=${opponentBotLevel}`)
    };

    const onPitSelect = (index: number, pit: Pit) => {
        if (!game || isSpectator || !userKey) {
            return;
        }
        if(userKeyWhoLeave || gameEnd) {
            notyf.error(t("GameEnded"));
            return;
        }
        if (viewedMove !== undefined) {
            notyf.error(t("ViewingMove", { number: viewedMove }));
            return;
        }
        if(game.mancalaGame.state === "ended") {
            notyf.error(t("GameEnded"));
            return;
        }
        if (Util.checkConnectionAndMaybeAlert(context, t)) return;
        if (game.mancalaGame.getPlayerIdByIndex(index) !== userKey) {
            notyf.error(t("UCanOnlyPlayYourOwnPits"));
            return;
        }
        const pitIndexForUser = index % (game.mancalaGame.board.totalPitCount() / 2);
        if (!game.mancalaGame.canPlayerMove(userKey, pitIndexForUser)) {
            notyf.error(t("OpponentTurn"));
            return;
        }
        if (checkHasAnOngoingAction()) {
            notyf.error(t("UMustWaitUntilCurrentMoveComplete"));
            return;
        }
        if (!boardViewModel) return;
        //TODO: this check should be in mancala.js
        if (pit.stoneCount === 0) {
            notyf.error(t("UCanNotPlayEmptyPit"));
            return;
        }
        setHasOngoingAction(true);
        const selectedPit = boardViewModel.pits[getBoardIndex(pitIndexForUser)];
        selectedPit.pitColor = context.themeManager.theme.pitSelectedColor;
        selectedPit.highlight = "selected";
        updateBoardViewModel(boardViewModel);
        const gameMove: GameMove = { index: pitIndexForUser };
        context.rtmt.sendMessage(channel_game_move, gameMove);
    };

    React.useEffect(() => {
        let pitAnimator: PitAnimator | undefined;
        let unlistenMessages: () => void;
        setLoadingStateGame(LoadingState.Loading())
        context.gameStore.get(params.gameId!!).then((loaded) => {
            if (loaded?.kind === "live") {
                const game = loaded.game;
                pitAnimator = new PitAnimator(context.themeManager, updateBoardViewModel);
                setPitAnimator(pitAnimator);
                onGameUpdate(pitAnimator, game);
                unlistenMessages = listenMessages(game, pitAnimator);
                setLoadingStateGame(LoadingState.Loaded({ value: game }))
            } else if (loaded?.kind === "finished") {
                setReplayRecord(loaded.record);
            } else {
                setLoadingStateGame(LoadingState.Error({ errorMessage: t("GameNotFound") }))
            }
        }).catch((error) => {
            console.error(error);
            setLoadingStateGame(LoadingState.Error({ errorMessage: t("ErrorWhenRetrievingInformation") }))
        })
        return () => {
            unlistenMessages?.();
            pitAnimator?.dispose();
        };
    }, []);

    const renderNewGameBtn = isSpectator || (userKeyWhoLeave || gameEnd || !game || (game && game.mancalaGame.state == "ended"));

    const moves = (mancalaGame?.history ?? []) as unknown as PlayedMove[];
    const isReviewing = viewedMove !== undefined && viewedMove < moves.length;
    const shownBoardViewModel = isReviewing && mancalaGame
        ? createBoardViewModel(getBoardAfterMove(moves, viewedMove!), context.themeManager.theme)
        : boardViewModel;
    const isGameOver = !!(userKeyWhoLeave || gameEnd || mancalaGame?.state === "ended");
    const isYourTurn = !isSpectator && !isGameOver && !!userKey && mancalaGame?.turnPlayerId === userKey;
    const selectMove = (moveNumber: number) => setViewedMove(moveNumber >= moves.length ? undefined : Math.max(0, moveNumber));
    useMoveKeys({
        previous: () => !replayRecord && selectMove((isReviewing ? viewedMove! : moves.length) - 1),
        next: () => !replayRecord && isReviewing && selectMove(viewedMove! + 1),
    });

    const playerInfo = (userId: string) => {
        const info = [gameUsersConnectionInfo?.user1ConnectionInfo, gameUsersConnectionInfo?.user2ConnectionInfo]
            .find((connectionInfo) => connectionInfo?.userId === userId);
        return { userId, name: info?.name, isGuest: info?.isGuest ?? true };
    };

    // How the game ended, as a saved game would say it; from the server's message when it sent one.
    const getEndSummary = (): FinishedGameSummary | undefined => {
        if (!mancalaGame || !isGameOver) return undefined;
        const player1 = playerInfo(mancalaGame.player1Id), player2 = playerInfo(mancalaGame.player2Id);
        const seatOf = (playerId: string) => playerId === mancalaGame.player1Id ? "player1" : "player2";
        if (gameEnd) return { result: gameEnd.result, endReason: gameEnd.endReason, player1, player2 } as FinishedGameSummary;
        if (userKeyWhoLeave) {
            const winner = userKeyWhoLeave === mancalaGame.player1Id ? "player2" : "player1";
            return { result: winner, endReason: "left", leftUserId: userKeyWhoLeave, player1, player2 } as FinishedGameSummary;
        }
        const winnerId = mancalaGame.getWonPlayerId();
        return { result: winnerId ? seatOf(winnerId) : "draw", endReason: "completed", player1, player2 } as FinishedGameSummary;
    };
    const endSummary = getEndSummary();
    // "You won · Opponent left" becomes the title "You won" and the reason "Opponent left".
    const [resultTitle, ...resultReasons] = endSummary
        ? getResultText(endSummary, isSpectator ? undefined : userKey, t).split(" · ")
        : [];
    const leftUserId = userKeyWhoLeave ?? gameEnd?.leftUserId;
    const resultReason = resultReasons.join(" · ")
        || (isSpectator && leftUserId ? `${getPlayerName(leftUserId) ?? t("Anonymous")} ${t("UserLeftTheGame")}` : undefined);

    const clockTimes = useGameClock(game, gameEnd);
    const renderClock = (playerId: string) => {
        const seat = mancalaGame && getSeat(mancalaGame, playerId);
        if (!clockTimes || !seat) return undefined;
        const timeMs = seat === "player1" ? clockTimes.player1Ms : clockTimes.player2Ms;
        return <GameClockView timeMs={timeMs} running={clockTimes.runningSeat === seat} />;
    };
    const showBoardView = game && boardViewModel && userKey && true;
    const topLocatedUserId = (isSpectator ? mancalaGame?.player2Id : getOpponentId()) || "0";
    const bottomLocatedUserId = (isSpectator ? mancalaGame?.player1Id : userKey) || "1";
    const topLocatedUser = {
        id: topLocatedUserId,
        name: getPlayerName(topLocatedUserId) ?? t("Anonymous"),
        isGuest: playerInfo(topLocatedUserId).isGuest,
        isOnline: isUserOnline(topLocatedUserId),
    };
    const bottomLocatedUser = {
        id: bottomLocatedUserId,
        name: getPlayerName(bottomLocatedUserId) ?? t("Anonymous"),
        isGuest: playerInfo(bottomLocatedUserId).isGuest,
        isOnline: isSpectator ? isUserOnline(bottomLocatedUserId) : context.rtmt.connectionState === "connected",
    };
    if (replayRecord) {
        return <ReplayView context={context} theme={theme} record={replayRecord} userKey={userKey} />;
    }

    const getTurnText = () => {
        if (isGameOver) return resultTitle ? `${t("GameEnded")} · ${resultTitle}` : t("GameEnded");
        if (isSpectator) return `${getPlayerName(mancalaGame!.turnPlayerId) ?? t("Anonymous")} ${t("Playing")}`;
        return isYourTurn ? t("YourTurn") : t("OpponentTurn");
    };

    const renderGame = () => {
        const board = mancalaGame!.board;
        const [topStore, bottomStore] = isPlayer2
            ? [board.player1BankIndex(), board.player2BankIndex()]
            : [board.player2BankIndex(), board.player1BankIndex()];
        const shownStones = (index: number) => shownBoardViewModel!.pits[index].stoneCount;
        const playerCard = (user: typeof topLocatedUser, storeIndex: number, role: string, alignRight: boolean) => (
            <PlayerCard
                name={user.name}
                isGuest={user.isGuest}
                details={[role, t("StoreCount", { count: shownStones(storeIndex) })].filter(Boolean).join(" · ")}
                active={!isGameOver && mancalaGame!.turnPlayerId === user.id}
                online={user.isOnline}
                clock={renderClock(user.id)}
                alignRight={alignRight} />
        );
        return (
            <div className="gl">
                <div className="a-opp">{playerCard(topLocatedUser, topStore, isSpectator ? "" : t("Opponent"), false)}</div>
                <div className="a-turn">
                    <div className={"turn" + (isYourTurn ? " mine" : "")} role="status">
                        {!isGameOver && <span className="dot" />}
                        {getTurnText()}
                    </div>
                </div>
                <div className="a-me">{playerCard(bottomLocatedUser, bottomStore, isSpectator ? "" : t("You"), true)}</div>
                <div className="a-board">
                    {isReviewing && (
                        <ReviewBanner
                            moveNumber={viewedMove!}
                            isYourTurn={isYourTurn}
                            onBackToLive={() => setViewedMove(undefined)} />
                    )}
                    <BoardView
                        game={game!}
                        boardViewModel={shownBoardViewModel!}
                        context={context}
                        onPitSelect={isSpectator ? undefined : onPitSelect}
                        canPlay={isYourTurn && !hasOngoingAction && !isReviewing}
                        lastMoveIndex={moves[(isReviewing ? viewedMove! : moves.length) - 1]?.moveIndex}
                        topName={topLocatedUser.name}
                        bottomName={bottomLocatedUser.name}
                        revert={isPlayer2} />
                    {isGameOver && !gameOverClosed && (
                        <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)} />
                    )}
                </div>
                <div className="a-moves">
                    <MoveList
                        moves={moves}
                        selectedMove={isReviewing ? viewedMove! : moves.length}
                        onSelect={selectMove}
                        playerName={(playerId) => getPlayerName(playerId) ?? t("Anonymous")}
                        accentPlayerId={bottomLocatedUserId}
                        newestFirst />
                </div>
            </div>
        );
    };

    return (
        <PageContainer>
            {renderHeaderBar()}
            <main className="wrap">
                {showBoardView && renderGame()}
                <LoadingComponent loadingState={gameLoadingState}></LoadingComponent>
            </main>
        </PageContainer>
    );

    function renderHeaderBar() {
        return <AppHeader context={context}>
            {renderNewGameBtn
                ? <button className="btn pri ic-m" aria-label={t("NewGame")} onClick={onNewGameClick}>
                    <PlusIcon /><span className="hide-m">{t("NewGame")}</span>
                </button>
                : <button className="btn ghost ic-m" aria-label={t("Leave")} onClick={onLeaveGameClick}>
                    <LeaveIcon /><span className="hide-m">{t("Leave")}</span>
                </button>}
        </AppHeader>;
    }
}

export default GamePage;