Implement a primitive join lobby method

server/src/events/lobby/players/join.ts

@@ -0,0 +1,81 @@
+import { colours, IJoinLobby, spaceships, Status } from "common";
+import { WebsocketEvent } from "@/types/WebsocketEvent";
+import { Player } from "@/objects/Player";
+import { games, log } from "@/main";
+
+const data: WebsocketEvent = {
+	name: "req:lobby.players.join",
+	handler(_, socket, data: IJoinLobby) {
+		try {
+			log.debug(`Attempting to join a game`);
+
+			let gID = data.game_code;
+			let name = data.name;
+
+			let game = games.get(gID);
+
+
+			// Ensure the user provided a game code that could be found
+			if (!game) {
+				socket.emit(`res:lobby.players.join`, {
+					status: Status.NotFound,
+					message: `Game could not be found with that game code`,
+				});
+				return;
+			};
+
+			let sameName = game.players.find(p => p.name == name);
+			if (sameName) {
+				socket.emit(`res:lobby.players.join`, {
+					status: Status.Forbidden,
+					message: `That name is already taken in the lobby, choose another name!`,
+				});
+				return;
+			};
+
+			// Ensure the game is currently in the lobby state
+			if (game.status !== `lobby`) {
+				socket.emit(`res:lobby.players.join`, {
+					status: Status.Forbidden,
+					message: `Can't join a game that is in-progress.`,
+				});
+				return;
+			};
+
+			let usedColours = game.players.map(p => p.colour);
+			let newPlayerColour = null;
+			do {
+				newPlayerColour = colours[Math.floor(Math.random() * colours.length)];
+			} while (usedColours.includes(newPlayerColour));
+
+			let player = new Player(socket, {
+				name,
+				colour: newPlayerColour,
+				ship: spaceships[0],
+				host: false,
+			});
+
+			game.players.push(player);
+			game.log.info(`${name} joined the game`);
+			socket.join(game.id);
+
+			let playerData = game.players.map(p => p.json());
+			socket.emit(`res:lobby.players.join`, {
+				status: Status.Success,
+				game_code: game.id,
+				players: playerData,
+			});
+			socket.to(game.id).emit(`res:lobby.info`, {
+				status: Status.Success,
+				players: playerData,
+			});
+
+		} catch (err) {
+			socket.emit(`res:error`, {
+				status: Status.UnknownError,
+				message: err.message,
+			});
+		};
+	},
+};
+export default data;