feat(pong): detect when the client hasnt sent anything in X secs

frontend/src/pages/pong/pong.ts

@@ -194,15 +194,15 @@ function pongClient(_url: string, _args: RouteHandlerParams): RouteHandlerReturn
 					showError("couldn't find your id in game");
 			}); // TODO: notif user of new game w "ready up" btn
 
-			socket.on("gameEnd", () => {
+			socket.on("gameEnd", (winner) => {
 				queueBtn.innerHTML = QueueState.Iddle;
 				queueBtn.style.color = 'white';
 
 				if (!isNullish(currentGame)) {
 					let new_div = document.createElement('div');
 					let end_txt = "";
-					if ((user.id === currentGame.left.id && currentGame.left.score > currentGame.right.score) ||
-						(user.id === currentGame.right.id && currentGame.right.score > currentGame.left.score))
+					if ((user.id === currentGame.left.id && winner === 'left') ||
+						(user.id === currentGame.right.id && winner === 'right'))
 						end_txt = 'won! #yippe';
 					else
 						end_txt = 'lost #sadge';

frontend/src/pages/pong/socket.ts

@@ -48,7 +48,7 @@ export interface ServerToClient {
 	updateInformation: (info: UpdateInfo) => void,
 	newGame: (initState: GameUpdate) => void, // <- consider this the gameProc eg not start of game but wait for client to "ready up"
 	gameUpdate: (state: GameUpdate) => void,
-	gameEnd: () => void;
+	gameEnd: (winner: 'left' | 'right') => void;
 };
 
 export type SSocket = Socket<ClientToServer, ServerToClient>;

src/pong/src/game.ts

@@ -98,6 +98,8 @@ function makeAngle(i: number): [number, number, number, number] {
 export class Pong {
 	public gameUpdate: NodeJS.Timeout | null = null;
 
+	public static readonly CONCEDED_TIMEOUT: number = 1500;
+
 	public static readonly BALL_START_ANGLES: number[] = [
 		...makeAngle(4),
 		...makeAngle(6),
@@ -127,6 +129,11 @@ export class Pong {
 	public score: [number, number] = [0, 0];
 	public local: boolean = false;
 
+	public rightLastSeen: number = -1;
+	public leftLastSeen: number = -1;
+
+	private cachedWinner: 'left' | 'right' | null = null;
+
 	public static makeLocal(owner: UserId): Pong {
 		const game = new Pong(owner, owner);
 		game.local = true;
@@ -200,7 +207,9 @@ export class Pong {
 		if (
 			(Math.abs(this.ball.angle) > Math.PI / 2 && side !== 'left') ||
 			(Math.abs(this.ball.angle) < Math.PI / 2 && side !== 'right')
-		) {return false;}
+		) {
+			return false;
+		}
 
 		// now we check only if the ball is near enought in the y axis to permform the collision
 		if (
@@ -212,7 +221,9 @@ export class Pong {
 					this.ball.y < paddle.y + paddle.height + this.ball.size
 				)
 			)
-		) {return false;}
+		) {
+			return false;
+		}
 
 		// so we know that the y is close enougth to be a bit, so we check the X. are we closer than the ball size ? if yes -> hit
 		if (
@@ -222,14 +233,49 @@ export class Pong {
 				paddle.width * (side === 'left' ? 1 : 0) -
 				this.ball.x,
 			) < this.ball.size
-		) {return true;}
+		) {
+			return true;
+		}
 		return false;
 	}
 
+	public updateLastSeen(user: UserId) {
+		if (this.local && this.userLeft === user) {
+			this.leftLastSeen = Date.now();
+			this.rightLastSeen = Date.now();
+		}
+		else if (this.userLeft === user) {
+			this.leftLastSeen = Date.now();
+		}
+		else if (this.userRight === user) {
+			this.rightLastSeen = Date.now();
+		}
+	}
+
 	public checkWinner(): 'left' | 'right' | null {
+		const checkInner = () => {
 			if (this.score[0] >= 5) return 'left';
 			if (this.score[1] >= 5) return 'right';
+
+			if (
+				this.leftLastSeen !== -1 &&
+				Date.now() - this.leftLastSeen > Pong.CONCEDED_TIMEOUT
+			) {
+				return 'right';
+			}
+			if (
+				this.rightLastSeen !== -1 &&
+				Date.now() - this.rightLastSeen > Pong.CONCEDED_TIMEOUT
+			) {
+				return 'left';
+			}
+
 			return null;
+		};
+		if (this.cachedWinner === null) {
+			this.cachedWinner = checkInner();
+		}
+		return this.cachedWinner;
 	}
 
 	public movePaddle(user: UserId | ('left' | 'right'), dir: 'up' | 'down') {

src/pong/src/socket.ts

@@ -47,7 +47,7 @@ export interface ServerToClient {
 	updateInformation: (info: UpdateInfo) => void,
 	newGame: (initState: GameUpdate) => void,
 	gameUpdate: (state: GameUpdate) => void,
-	gameEnd: () => void;
+	gameEnd: (winner: 'left' | 'right') => void;
 };
 
 export type SSocket = Socket<ClientToServer, ServerToClient>;

src/pong/src/state.ts

@@ -128,6 +128,7 @@ class StateI {
 			if (u.moveRight !== null) { game.movePaddle('right', u.moveRight); }
 		}
 		else if (u.move !== null) { game.movePaddle(user.id, u.move); }
+		game.updateLastSeen(user.id);
 	}
 
 
@@ -174,14 +175,15 @@ class StateI {
 	private cleanupGame(gameId: GameId, game: Pong): void {
 		clearInterval(game.gameUpdate ?? undefined);
 		this.games.delete(gameId);
+		const winner = game.checkWinner() ?? 'left';
 		let player: PUser | undefined = undefined;
 		if ((player = this.users.get(game.userLeft)) !== undefined) {
 			player.currentGame = null;
-			player.socket.emit('gameEnd');
+			player.socket.emit('gameEnd', winner);
 		}
 		if ((player = this.users.get(game.userRight)) !== undefined) {
 			player.currentGame = null;
-			player.socket.emit('gameEnd');
+			player.socket.emit('gameEnd', winner);
 		}
 		const rOutcome = game.checkWinner();
 		let outcome: PongGameOutcome = 'other';