/** Serve the game state of any valid game id. */
app.get('/:gameid/game', (req, res) => {
    const userid = getUserId(req, res);
    const game = games[parseInt(req.params['gameid'])]
    if (game == undefined) {
        res.status(404).json("no such game");
    } else {
        if (isWaiting(game, userid)) {
            // Game is still waiting for a second player - join it!
            console.log(`Game ${game.id} directly joined by ${userid}`)
            joinGame(game, userid)
        }
        res.json(toJson(game, userid))
    }
})