Add proper game code generation

server/src/objects/Game.ts

@@ -1,10 +1,9 @@
 import { determineDirection, FuelCard } from "common";
+import { config, games, log } from "@/main";
 import { promises as fs } from "fs";
-import { v4 as uuid } from "uuid";
 import { Player } from "./Player";
 import { Logger } from "tslog";
 import { Deck } from "./Deck";
-import { log } from "../main";
 import path from "path";
 
 export class Game {
@@ -32,7 +31,7 @@ export class Game {
 		// Instantiate the deck
 		this.loadDeck();
 
-		this.id = uuid();
+		this.id = Game.generateID(config.game.code_length);
 
 		this.log = log.getChildLogger({
 			name: this.id,
@@ -73,13 +72,38 @@ export class Game {
 	 * ---
 	 *
 	 * Possible Return Values:
-	 * - `-1` = Away from the Warp Gate
+	 * - `-1` = Away from the Warp Gate (towards the black hole)
 	 * - `0` = Not moving
-	 * - `1` = Towards the Warp Gate
+	 * - `1` = Towards the Warp Gate (away from the black hole)
 	 */
 	public movementDirection(player: Player): number {
 		let location = this.board.indexOf(player);
 		this.log.debug(`Calculating movement direction for ${player.name}`);
 		return determineDirection(this.board, location);
 	};
+
+	/**
+	 * Generates a game code with the given length
+	 *
+	 * @param length The length of the code to generate
+	 */
+	public static generateID(length: number): string {
+		let code: string;
+
+		// Prevent erroneous codes from being generated
+		if (length <= 0) {
+			throw new Error("Can't code have a length <= 0");
+		};
+
+		// Generate a new code until we find one that isn't taken already.
+		do {
+			code = ``;
+
+			for (var i = 0; i < length; i++) {
+				code += Math.floor(Math.random() * 9);
+			};
+		} while (games.has(code));
+
+		return code;
+	}
 };