benfluleck/HelloBooks

import {
  ADD_CATEGORY_SUCCESS,
  EDIT_CATEGORY_SUCCESS,
  DELETE_CATEGORY_SUCCESS,
  FETCH_CATEGORIES_SUCCESS,
  FETCH_CATEGORIES_FAILURE,
} from '../actions/actionType';

const InitialBooksState = {
};

/**
 * @description this Reducer implements the action for the category reducer
 *
 * @param {any} [state=INITIAL_STATE]
 *
 * @param {any} [action={}]
 *
 * @param {object}  error
 *
 * @returns {object}  state
 */
export default function categoryReducer(
  state = InitialBooksState,
  action = {}
) {
  switch (action.type) {
  case FETCH_CATEGORIES_SUCCESS:
    return { ...state, categoryList: action.categories.categories };
  case FETCH_CATEGORIES_FAILURE:
    return { ...state, error: action.error };

  case ADD_CATEGORY_SUCCESS:
    return {
      ...state,
      categoryList: [...state.categoryList,
        action.category.category
      ]
    };
  case EDIT_CATEGORY_SUCCESS:
    return {
      ...state,
      categoryList: state.categoryList.map(category =>
        ((category.id !== action.category.updatedCategory.id) ?
          category : action.category.updatedCategory))
    };

  case DELETE_CATEGORY_SUCCESS:
    return {
      ...state,
      categoryList: state.categoryList
        .filter(category =>
          category.id !== action.deletedCategory.category.id)
    };

  default:
    return state;
  }
}