import { useReducer, useRef } from 'react';


const initialState = () => ({
  appSettings: {
    apiURL: 'https://pool.wowne.ro/api',
    appLoaded: false,
    coinDecimals: 11,
  },
  pool: {
    config: null,
  },
  user: {
    loggedIn: false,
  },
  messages: {},
});

let updatedState;

const reducer = (state, action) => {
  let result = {};
  const {
    appLoaded,
    config,
    loggedIn,
  } = action;

  switch (action.type) {
    case 'APP_LOADED':
      result = {
        ...state,
        appSettings: {
          ...state.appSettings,
          appLoaded,
        },
      };
      break;
    case 'CLEAR_MESSAGES':
      result = { ...state, messages: {} };
      break;
    case 'USER_LOGGED_IN':
      result = { ...state, user: { loggedIn } };
      break;
    case 'UPDATE_POOL_CONFIG':
      result = {
        ...state,
        pool: {
          ...state.pool,
          config,
        }
      };
      break;
    default:
      throw new Error();
  }
  updatedState.current = result;
  return result;
};

const useAppState = () => {
  const state = initialState();
  updatedState = useRef(state);
  return [...useReducer(reducer, state), updatedState];
};

export default useAppState;