export class Sessions extends EventManager {
  constructor() {
    this.users = [];
  }

  userExists(user) {
    return !!this.findUser(user);
  }

  findUser(user) {
    return this.users.find(u => u.username === user.username);
  }

  addUser(user) {
    if (!this.userExists(user)) {
      this.users.push(user);
      this.emit('user-logged-in', user);
    }
  }

  clearUser(user) {
    if (this.userExists(user)) {
      const index = this.users.indexOf(user);

      if (index > -1) {
        this.users.splice(index - 1, 1);
        this.emit('user-removed', user);
      }
    }
  }
}