import { Map } from "immutable"

import jwtDecode from "jwt-decode"
import Cookies from "universal-cookie"

const defaultState = Map({
  loading: false,
  username: "",
  isAdmin: false,
  isLogged: false,
  polochonToken: "",
  polochonUrl: "",
});

const handlers = {
  "USER_LOGIN_PENDING": state => state.set("loading", true),
  "USER_LOGIN_FULFILLED": (state, action) => {
    if (action.payload.response.status === "error") {
      return logoutUser()
    }
    return updateFromToken(state, action.payload.response.data.token)
  },
  "USER_SET_TOKEN": (state, action) => updateFromToken(state, action.payload.token),
  "USER_LOGOUT": () => logoutUser(),
  "GET_USER_FULFILLED": (state, action) => state.merge(Map({
    polochonToken: action.payload.response.data.token,
    polochonUrl: action.payload.response.data.url,
  })),
}

function logoutUser() {
  localStorage.removeItem("token");
  const cookies = new Cookies();
  cookies.remove("token");
  return defaultState
}

function updateFromToken(state, token) {
  const decodedToken = jwtDecode(token);
  localStorage.setItem("token", token);

  const cookies = new Cookies();
  cookies.set("token", token);

  return state.merge(Map({
    userLoading: false,
    isLogged: true,
    isAdmin: decodedToken.isAdmin,
    username: decodedToken.username,
  }))
}

export default (state = defaultState, action) =>
  handlers[action.type] ? handlers[action.type](state, action) : state;