implement ready up for players in a game lobby

src/routes/api/games/[gameid]/players/[playerid]/+server.ts

@@ -0,0 +1,60 @@
+import type { GameData } from "$lib/GameData";
+import { isGamePlayer, type GamePlayer } from "$lib/GamePlayer";
+import { isListing } from "$lib/Listing";
+import { Game } from "$lib/server/Game";
+import { updateListing } from "$lib/server/modifyListing";
+import {
+	readListingById,
+	ServerCollections,
+	writeUpdatedListing,
+} from "$lib/server/mongo";
+import { getBody, getParam, ResourceId } from "$lib/server/requestTools";
+import {
+	badRequestResponse,
+	conflictResponse,
+	notFoundResponse,
+	singleResponse,
+} from "$lib/server/responseBodies";
+import type { RequestHandler } from "@sveltejs/kit";
+
+export const PUT: RequestHandler = async ({ params, request }): Promise<Response> => {
+	const id = getParam(params, ResourceId.Game);
+
+	if (id === null) {
+		return badRequestResponse("missing playerid parameter");
+	}
+
+	let player: GamePlayer | null;
+	try {
+		player = await getBody(request, isGamePlayer);
+	} catch (err) {
+		return badRequestResponse("missing player body");
+	}
+
+	if (!player) {
+		return badRequestResponse("malformed request");
+	}
+
+	const listing = await readListingById(ServerCollections.Games, id, isListing<GameData>);
+	if (!listing) {
+		return notFoundResponse();
+	}
+
+	if (listing.data.isStarted === true) {
+		return conflictResponse();
+	}
+
+	const game = Game.from(listing.data);
+	if (game.setPlayerReady(player) === null) return notFoundResponse();
+
+	// TODO: there's a potential race condition here where some player is unreadying as this
+	//       function is running. This should do some kind of check in MongoDB to make sure
+	//       all players are ready if it's starting the game. For now: good enough.
+	if (game.players.every(({ isReady }) => isReady)) {
+		game.start();
+	}
+
+	await writeUpdatedListing(ServerCollections.Games, updateListing(listing, game));
+
+	return singleResponse(game);
+};