feat(admin): allow admin users to view and submit code before game starts

Admin users can now access the gaming UI (problem description, code
editor, submit button) even when a game has not started yet. Regular
users still see the waiting screen as before.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

4 files changed, 25 insertions, 7 deletions

diff --git a/backend/api/handler.go b/backend/api/handler.go
index 4d729f1..ad7d55a 100644
--- a/backend/api/handler.go
+++ b/backend/api/handler.go
@@ -236,7 +236,7 @@ func (h *Handler) GetGamePlaySubmissions(ctx context.Context, request GetGamePla
 }
 
 func (h *Handler) PostGamePlayCode(ctx context.Context, request PostGamePlayCodeRequestObject, user *db.User) (PostGamePlayCodeResponseObject, error) {
-	err := h.gameSvc.SaveCode(ctx, request.GameID, user.UserID, request.Body.Code)
+	err := h.gameSvc.SaveCode(ctx, request.GameID, user.UserID, request.Body.Code, user.IsAdmin)
 	if err != nil {
 		if errors.Is(err, game.ErrNotFound) {
 			return PostGamePlayCode404JSONResponse{Message: "Game not found"}, nil
@@ -250,7 +250,7 @@ func (h *Handler) PostGamePlayCode(ctx context.Context, request PostGamePlayCode
 }
 
 func (h *Handler) PostGamePlaySubmit(ctx context.Context, request PostGamePlaySubmitRequestObject, user *db.User) (PostGamePlaySubmitResponseObject, error) {
-	err := h.gameSvc.SubmitCode(ctx, request.GameID, user.UserID, request.Body.Code)
+	err := h.gameSvc.SubmitCode(ctx, request.GameID, user.UserID, request.Body.Code, user.IsAdmin)
 	if err != nil {
 		if errors.Is(err, game.ErrNotFound) {
 			return PostGamePlaySubmit404JSONResponse{}, nil
diff --git a/backend/game/service.go b/backend/game/service.go
index 13900e1..a054388 100644
--- a/backend/game/service.go
+++ b/backend/game/service.go
@@ -202,7 +202,7 @@ func (s *Service) GetGameByID(ctx context.Context, gameID int, isAdmin bool) (De
 	return game, nil
 }
 
-func (s *Service) SaveCode(ctx context.Context, gameID int, userID int32, code string) error {
+func (s *Service) SaveCode(ctx context.Context, gameID int, userID int32, code string, isAdmin bool) error {
 	gameRow, err := s.q.GetGameByID(ctx, int32(gameID))
 	if err != nil {
 		if errors.Is(err, pgx.ErrNoRows) {
@@ -210,7 +210,7 @@ func (s *Service) SaveCode(ctx context.Context, gameID int, userID int32, code s
 		}
 		return err
 	}
-	if !IsGameRunning(gameRow.StartedAt, gameRow.DurationSeconds) {
+	if !IsGameRunning(gameRow.StartedAt, gameRow.DurationSeconds) && !isAdmin {
 		return ErrGameNotRunning
 	}
 	return s.q.UpdateCode(ctx, db.UpdateCodeParams{
@@ -221,7 +221,7 @@ func (s *Service) SaveCode(ctx context.Context, gameID int, userID int32, code s
 	})
 }
 
-func (s *Service) SubmitCode(ctx context.Context, gameID int, userID int32, code string) error {
+func (s *Service) SubmitCode(ctx context.Context, gameID int, userID int32, code string, isAdmin bool) error {
 	gameRow, err := s.q.GetGameByID(ctx, int32(gameID))
 	if err != nil {
 		if errors.Is(err, pgx.ErrNoRows) {
@@ -233,7 +233,7 @@ func (s *Service) SubmitCode(ctx context.Context, gameID int, userID int32, code
 	language := gameRow.Language
 	codeSize := s.hub.CalcCodeSize(code, language)
 
-	if !IsGameRunning(gameRow.StartedAt, gameRow.DurationSeconds) {
+	if !IsGameRunning(gameRow.StartedAt, gameRow.DurationSeconds) && !isAdmin {
 		return ErrGameNotRunning
 	}
 
diff --git a/frontend/app/components/GolfPlayApp.tsx b/frontend/app/components/GolfPlayApp.tsx
index 6c77f8c..1c1e7ae 100644
--- a/frontend/app/components/GolfPlayApp.tsx
+++ b/frontend/app/components/GolfPlayApp.tsx
@@ -121,6 +121,22 @@ export default function GolfPlayApp({ game, player, initialGameState }: Props) {
 	if (gameStateKind === "loading") {
 		return <GolfPlayAppLoading />;
 	} else if (gameStateKind === "waiting") {
+		if (player.is_admin) {
+			return (
+				<GolfPlayAppGaming
+					gameDisplayName={game.display_name}
+					playerProfile={playerProfile}
+					problemTitle={game.problem.title}
+					problemDescription={game.problem.description}
+					problemLanguage={game.problem.language}
+					sampleCode={game.problem.sample_code}
+					initialCode={initialGameState.code}
+					onCodeChange={onCodeChange}
+					onCodeSubmit={onCodeSubmit}
+					isFinished={false}
+				/>
+			);
+		}
 		return (
 			<GolfPlayAppWaiting
 				gameDisplayName={game.display_name}
diff --git a/frontend/app/components/GolfPlayApps/GolfPlayAppGaming.tsx b/frontend/app/components/GolfPlayApps/GolfPlayAppGaming.tsx
index 7d81c82..fa9a2b4 100644
--- a/frontend/app/components/GolfPlayApps/GolfPlayAppGaming.tsx
+++ b/frontend/app/components/GolfPlayApps/GolfPlayAppGaming.tsx
@@ -43,7 +43,7 @@ export default function GolfPlayAppGaming({
 	onCodeSubmit,
 	isFinished,
 }: Props) {
-	const leftTimeSeconds = useAtomValue(gamingLeftTimeSecondsAtom)!;
+	const leftTimeSeconds = useAtomValue(gamingLeftTimeSecondsAtom);
 	const score = useAtomValue(scoreAtom);
 	const status = useAtomValue(statusAtom);
 
@@ -72,6 +72,8 @@ export default function GolfPlayAppGaming({
 					<div className="text-gray-100">{gameDisplayName}</div>
 					{isFinished ? (
 						<div className="text-2xl md:text-3xl">終了</div>
+					) : leftTimeSeconds === null ? (
+						<div className="text-2xl md:text-3xl">未開始</div>
 					) : (
 						<LeftTime sec={leftTimeSeconds} />
 					)}