import { ConnectCallback, DisconnectCallback, GameRoom } from "./GameRoom"; import { User } from "./User"; import { PositionInterface } from "_Model/PositionInterface"; import { Movable } from "_Model/Movable"; import { PositionNotifier } from "_Model/PositionNotifier"; import { MAX_PER_GROUP } from "../Enum/EnvironmentVariable"; import type { Zone } from "../Model/Zone"; export class Group implements Movable { private static nextId: number = 1; private id: number; private users: Set; private x!: number; private y!: number; private wasDestroyed: boolean = false; private roomId: string; private currentZone: Zone | null = null; constructor( roomId: string, users: User[], private groupRadius: number, private connectCallback: ConnectCallback, private disconnectCallback: DisconnectCallback, private positionNotifier: PositionNotifier ) { this.roomId = roomId; this.users = new Set(); this.id = Group.nextId; Group.nextId++; users.forEach((user: User) => { this.join(user); }); this.updatePosition(); } getUsers(): User[] { return Array.from(this.users.values()); } getId(): number { return this.id; } /** * Returns the barycenter of all users (i.e. the center of the group) */ getPosition(): PositionInterface { return { x: this.x, y: this.y, }; } /** * Computes the barycenter of all users (i.e. the center of the group) */ updatePosition(): void { const oldX = this.x; const oldY = this.y; let x = 0; let y = 0; // Let's compute the barycenter of all users. this.users.forEach((user: User) => { const position = user.getPosition(); x += position.x; y += position.y; }); x /= this.users.size; y /= this.users.size; if (this.users.size === 0) { throw new Error("EMPTY GROUP FOUND!!!"); } this.x = x; this.y = y; if (oldX === undefined) { this.currentZone = this.positionNotifier.enter(this); } else { this.currentZone = this.positionNotifier.updatePosition(this, { x, y }, { x: oldX, y: oldY }); } } searchForNearbyUsers(): void { if (!this.currentZone) return; for (const user of this.positionNotifier.getAllUsersInSquareAroundZone(this.currentZone)) { if (user.group || this.isFull()) return; //we ignore users that are already in a group. const distance = GameRoom.computeDistanceBetweenPositions(user.getPosition(), this.getPosition()); if (distance < this.groupRadius) { this.join(user); this.updatePosition(); } } } isFull(): boolean { return this.users.size >= MAX_PER_GROUP; } isEmpty(): boolean { return this.users.size <= 1; } join(user: User): void { // Broadcast on the right event this.connectCallback(user, this); this.users.add(user); user.group = this; } leave(user: User): void { const success = this.users.delete(user); if (success === false) { throw new Error("Could not find user " + user.id + " in the group " + this.id); } user.group = undefined; if (this.users.size !== 0) { this.updatePosition(); } // Broadcast on the right event this.disconnectCallback(user, this); } /** * Let's kick everybody out. * Usually used when there is only one user left. */ destroy(): void { for (const user of this.users) { this.leave(user); } this.wasDestroyed = true; } get getSize() { return this.users.size; } }