import {BehaviorSubject} from "rxjs/BehaviorSubject";
import {User} from "../../models/model-interfaces";

export const LOAD = 'LOAD';
export const ADD = 'ADD';
export const EDIT = 'EDIT';
export const REMOVE = 'REMOVE';

export class UserStore {

  private users: User[] = [];

  items$ = new BehaviorSubject<User[]>([]);

  dispatch(action) {
    this.users = this._reduce(this.users, action);
    this.items$.next(this.users);
  }

  _reduce(users: User[], action) {
    switch (action.type) {
      case LOAD:
        return [...action.data];
      case ADD:
        return [...users, action.data];
      case EDIT:
        return users.map(user => {
          const editedUser = action.data;
          if (user._id !== editedUser._id) {
            return user;
          }
          return editedUser;
        });
      case REMOVE:
        return users.filter(user => user._id !== action.data._id);
      default:
        return users;
    }
  }

}