import { useReducer } from 'react';
import { localeCompare } from '../util/Locale';

const initialState = {
  username: '',

  isCurrentUser: function (otherUsername) {
    return localeCompare(this.username, otherUsername)
  }
};

function reducer(state, action) {
  switch (action.type) {

    case 'parse':
      return {
        ...state,
        username: action.userJson.holdingIdentity.name
      };

    default:
      throw Error('UserReducer: unknown action.type', action.type);
  }
}

export default function useUserReducer() {
  return useReducer(reducer, initialState);
}