import { World, ConnectCallback, DisconnectCallback } from "./World"; import { User } from "./User"; import {PositionInterface} from "_Model/PositionInterface"; import {uuid} from "uuidv4"; import {Movable} from "_Model/Movable"; export class Group implements Movable { static readonly MAX_PER_GROUP = 4; private id: string; private users: Set; private connectCallback: ConnectCallback; private disconnectCallback: DisconnectCallback; constructor(users: User[], connectCallback: ConnectCallback, disconnectCallback: DisconnectCallback) { this.users = new Set(); this.connectCallback = connectCallback; this.disconnectCallback = disconnectCallback; this.id = uuid(); users.forEach((user: User) => { this.join(user); }); } getUsers(): User[] { return Array.from(this.users.values()); } getId() : string{ return this.id; } /** * Returns the barycenter of all users (i.e. the center of the group) */ getPosition(): PositionInterface { let x = 0; let y = 0; // Let's compute the barycenter of all users. this.users.forEach((user: User) => { x += user.position.x; y += user.position.y; }); x /= this.users.size; y /= this.users.size; return { x, y }; } isFull(): boolean { return this.users.size >= Group.MAX_PER_GROUP; } isEmpty(): boolean { return this.users.size <= 1; } join(user: User): void { // Broadcast on the right event this.connectCallback(user.id, 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; // Broadcast on the right event this.disconnectCallback(user.id, 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); } } }