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

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

export class RankStore {

  private ranks: Rank[] = [];

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

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

  _reduce(ranks: Rank[], action) {
    switch (action.type) {
      case LOAD:
        return [...action.data];
      case ADD:
        return [...ranks, action.data];
      case EDIT:
        return ranks.map(decoration => {
          const editedRank = action.data;
          if (decoration._id !== editedRank._id) {
            return decoration;
          }
          return editedRank;
        });
      case REMOVE:
        return ranks.filter(decoration => decoration._id !== action.data._id);
      default:
        return ranks;
    }
  }

}