import { useReducer, useRef } from 'react';


const initialState = () => ({
  appSettings: {
    apiURL: 'https://pool.wowne.ro/api',
    appLoaded: false,
    coinDecimals: 11,
    coinSymbol: 9077,  // hex 2375 (⍵) https://git.wownero.com/wownero/meta/issues/2
    minerStatsUpdateInterval: 15,
    networkStatsUpdateInterval: 15,
    poolStatsUpdateInterval: 30,
  },
  intervals: [],
  messages: {},
  pool: {
    config: null,
    hasAids: false,
    networkStats: null,
    stats: null,
  },
  user: {
    loggedIn: false,
    wallets: null,
  },
});

let updatedState;

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

  switch (action.type) {
    case 'APP_LOADED':
      result = {
        ...state,
        appSettings: {
          ...state.appSettings,
          appLoaded,
        },
      };
      break;
    case 'UPDATE_WALLETS':
      result = {
        ...state,
        user: {
          ...state.user,
          wallets: JSON.parse(localStorage.getItem('pool.wowne.ro')),
        },
      };
      break;
    case 'SET_INTERVALS':
      const intervals = action.intervals.map(i => setInterval(i.fn, i.time * 1000, i.params));
      result = {
        ...state,
        intervals,
      };
      break;
    case 'USER_LOGGED_IN':
      result = { ...state, user: { loggedIn } };
      break;
    case 'UPDATE_POOL_CONFIG':
      result = {
        ...state,
        pool: {
          ...state.pool,
          config,
        }
      };
      break;
    case 'UPDATE_POOL_STATS':
      result = {
        ...state,
        pool: {
          ...state.pool,
          stats,
        }
      };
      break;
    case 'UPDATE_NETWORK_STATS':
      result = {
        ...state,
        pool: {
          ...state.pool,
          networkStats,
        }
      };
      break;
    case 'CLEAR_APP':
      state.intervals.forEach(interval => clearInterval(interval));
      result = {
        ...state,
        intervals: [],
      };
      break;
    case 'CLEAR_MESSAGES':
      result = { ...state, messages: {} };
      break;
    case 'HAS_AIDS':
      result = {
        ...state,
        pool: {
          ...state.pool,
          hasAids,
        }
      }
      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;