text: /*
   * Copyright 2019 is-land
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import { map, reject } from 'lodash';
  
  import * as routines from './topicRoutines';
  import { isKeyEqual, sortByName } from 'utils/object';
  
  const initialState = {
    isFetching: false,
    data: [],
    lastUpdated: null,
    error: null,
  };
  
  const reducer = (state, action) => {
    switch (action.type) {
      case routines.initializeRoutine.TRIGGER:
        return initialState;
      case routines.fetchTopicsRoutine.REQUEST:
      case routines.createTopicRoutine.REQUEST:
      case routines.updateTopicRoutine.REQUEST:
      case routines.deleteTopicRoutine.REQUEST:
        return {
          ...state,
          isFetching: true,
          error: null,
        };
      case routines.fetchTopicsRoutine.SUCCESS:
        return {
          ...state,
          isFetching: false,
          data: sortByName(action.payload),
          lastUpdated: new Date(),
        };
      case routines.createTopicRoutine.SUCCESS:
        return {
          ...state,
          isFetching: false,
          data: sortByName([...state.data, action.payload]),
          lastUpdated: new Date(),
        };
      case routines.updateTopicRoutine.SUCCESS:
        return {
          ...state,
          isFetching: false,
          data: map(state.data, topic =>
            isKeyEqual(topic, action.payload)
              ? { ...topic, ...action.payload }
              : topic,
          ),
          lastUpdated: new Date(),
        };
      case routines.deleteTopicRoutine.SUCCESS:
        return {
          ...state,
          isFetching: false,
          data: reject(state.data, topic => isKeyEqual(topic, action.payload)),
          lastUpdated: new Date(),
        };
      case routines.fetchTopicsRoutine.FAILURE:
      case routines.createTopicRoutine.FAILURE:
      case routines.updateTopicRoutine.FAILURE:
      case routines.deleteTopicRoutine.FAILURE:
        return {
          ...state,
          isFetching: false,
          error: action.payload,
        };
      default:
        return state;
    }
  };
  
  export { reducer, initialState };
  