Do not leave group when following is active

back/src/Model/GameRoom.ts

@@ -139,6 +139,7 @@ export class GameRoom {
             joinRoomMessage.getIpaddress(),
             position,
             false,
+            [],
             this.positionNotifier,
             socket,
             joinRoomMessage.getTagList(),
@@ -231,7 +232,7 @@ export class GameRoom {
             // If the user is part of a group:
             //  should he leave the group?
             const distance = GameRoom.computeDistanceBetweenPositions(user.getPosition(), user.group.getPosition());
-            if (distance > this.groupRadius) {
+            if (user.following.length === 0 && distance > this.groupRadius) {
                 this.leaveGroup(user);
             }
         }

back/src/Model/User.ts

@@ -25,6 +25,7 @@ export class User implements Movable {
         public readonly IPAddress: string,
         private position: PointInterface,
         public silent: boolean,
+        public following: string[],
         private positionNotifier: PositionNotifier,
         public readonly socket: UserSocket,
         public readonly tags: string[],
@@ -48,6 +49,21 @@ export class User implements Movable {
         this.positionNotifier.updatePosition(this, position, oldPosition);
     }
 
+    public addFollower(name: string): void {
+        if (this.following.includes(name)) {
+            return;
+        }
+        this.following.push(name);
+    }
+
+    public delFollower(name: string): void {
+        const idx = this.following.indexOf(name);
+        if (idx === -1) {
+            return;
+        }
+        this.following.splice(idx, 1);
+    }
+
     private batchedMessages: BatchMessage = new BatchMessage();
     private batchTimeout: NodeJS.Timeout | null = null;
 

back/src/Services/SocketManager.ts

@@ -847,19 +847,35 @@ export class SocketManager {
         const clientMessage = new ServerToClientMessage();
         clientMessage.setFollowconfirmationmessage(message);
         room.sendToUserWithName(message.getLeader(), clientMessage);
+
+        room.getUserByName(message.getLeader())?.addFollower(user.name);
+        user.addFollower(message.getLeader());
     }
 
     handleFollowAbortMessage(room: GameRoom, user: User, message: FollowAbortMessage) {
         if (message.getRole() === "leader") {
+            // Forward message
             const clientMessage = new ServerToClientMessage();
             clientMessage.setFollowabortmessage(message);
             room.sendToOthersInGroupIncludingUser(user, clientMessage);
+
+            // Update followers
+            room.getGroupIncludingUser(user)
+                ?.getUsers()
+                .forEach((user) => {
+                    user.following = [];
+                });
         } else {
+            // Forward message
             const recipient = message.getPlayername();
             message.setPlayername(user.name);
             const clientMessage = new ServerToClientMessage();
             clientMessage.setFollowabortmessage(message);
             room.sendToUserWithName(recipient, clientMessage);
+
+            // Update followers
+            room.getUserByName(recipient)?.delFollower(user.name);
+            user.following = [];
         }
     }
 }

back/tests/PositionNotifierTest.ts

@@ -26,14 +26,14 @@ describe("PositionNotifier", () => {
             y: 500,
             moving: false,
             direction: 'down'
-        }, false, positionNotifier, {} as UserSocket, [], null, 'foo', []);
+        }, false, [], positionNotifier, {} as UserSocket, [], null, 'foo', []);
 
         const user2 = new User(2, 'test', '10.0.0.2', {
             x: -9999,
             y: -9999,
             moving: false,
             direction: 'down'
-        }, false, positionNotifier, {} as UserSocket, [], null, 'foo', []);
+        }, false, [], positionNotifier, {} as UserSocket, [], null, 'foo', []);
 
         positionNotifier.addZoneListener({} as ZoneSocket, 0, 0);
         positionNotifier.addZoneListener({} as ZoneSocket, 0, 1);
@@ -101,14 +101,14 @@ describe("PositionNotifier", () => {
             y: 500,
             moving: false,
             direction: 'down'
-        }, false, positionNotifier, {} as UserSocket, [], null, 'foo', []);
+        }, false, [], positionNotifier, {} as UserSocket, [], null, 'foo', []);
 
         const user2 = new User(2, 'test', '10.0.0.2', {
             x: 0,
             y: 0,
             moving: false,
             direction: 'down'
-        }, false, positionNotifier, {} as UserSocket, [], null, 'foo', []);
+        }, false, [], positionNotifier, {} as UserSocket, [], null, 'foo', []);
 
         const listener = {} as ZoneSocket;
         positionNotifier.addZoneListener(listener, 0, 0);