import {
  FOLLOWERS_FETCH_SUCCESS,
  FOLLOWING_FETCH_SUCCESS
}                          from '../actions/accounts';
import Immutable           from 'immutable';

const initialState = Immutable.Map({
  followers: Immutable.Map(),
  following: Immutable.Map()
});

export default function userLists(state = initialState, action) {
  switch(action.type) {
    case FOLLOWERS_FETCH_SUCCESS:
      return state.setIn(['followers', action.id], Immutable.List(action.accounts.map(item => item.id)));
    case FOLLOWING_FETCH_SUCCESS:
      return state.setIn(['following', action.id], Immutable.List(action.accounts.map(item => item.id)));
    default:
      return state;
  }
};