import { omit, remove } from 'lodash';
import { ActionTypes } from '../util/ActionTypes';
import {REHYDRATE} from 'redux-persist/constants';
import update from 'immutability-helper';

export const initialState = {
  userFavorites: [],
  favoritesMap: {},
};

export function FavoriteReducer(state = initialState, action) {
  switch (action.type) {

    case ActionTypes.FETCH_FAVORITES_REQUEST_SUCCESS:
      const userFavorites = [];
      const favoritesMap = {};
      action.data.favorites.map((item) => {
        let key = item.favoritedUrl;
        key = key.split('/');
        key = key[key.length - 1];
        favoritesMap[key] = item;
        userFavorites.push(key);
      });
      return {
        ...state,
        userFavorites,
        favoritesMap,
      }

    case ActionTypes.ADD_FAVORITE_FOR_USER: {
      const data = action.data;
      const favoritedUrl = data.favoritedUrl;
      let sessionId = favoritedUrl.split('/');
      sessionId = sessionId[sessionId.length - 1];

      return update(state, {
        userFavorites: {$unshift: [sessionId]},
        favoritesMap: {$merge: {[sessionId]: data}},
      });
    }

    case ActionTypes.DELETE_FAVORITE_FOR_USER: {
      const sessionId = action.sessionId;
      let userFavorites = state.userFavorites.slice();
      remove(userFavorites, (item) => {
        return item === sessionId;
      });

      let favoritesMap = Object.assign({}, state.favoritesMap);
      favoritesMap = omit(favoritesMap, [sessionId]);

      return update(state, {
        userFavorites: {$set: userFavorites},
        favoritesMap: {$set: favoritesMap},
      });
    }

    case ActionTypes.LOGOUT:
      return initialState;

    default:
      return state;
  }
}