// @flow
import {
  combineActions,
  createAction,
  handleActions
}                       from 'redux-actions';
import { fromJS }       from 'immutable';
import { pickAll }      from 'ramda';
import moment           from 'moment';
import * as authActions from './auth';
import LoginService     from '../services/auth/login';
import {
  createThunk,
  SUFFIX as ThunkSuffix
}                       from '../utils/createThunk';

// /////////////////////
// constants
// /////////////////////
const dateFormat = 'DD/MM/YYYY HH:mm';

const ENTER_LOGIN_VIEW: string = 'app/login/ENTER_LOGIN_VIEW';
const LEAVE_LOGIN_VIEW: string = 'app/login/LEAVE_LOGIN_VIEW';
const ASYNC_LOGIN = 'app/login/ASYNC_LOGIN';

export const ACTIONS = {
  ENTER_LOGIN_VIEW,
  LEAVE_LOGIN_VIEW
};

export const initialState = fromJS({
  currentView   : 'login',
  enterTime     : null,
  leaveTime     : null,
  isLoggingIn   : false,
  isLoginInvalid: false,
  isLoggedIn    : false
});

// /////////////////////
// action creators
// /////////////////////
export const enterLogin = createAction(ENTER_LOGIN_VIEW, (time = moment()
  .format(dateFormat)) => ({
  enterTime: time,
  leaveTime: null
}));

export const leaveLogin = createAction(
  LEAVE_LOGIN_VIEW, (time = moment()
    .format(dateFormat)) => ({
    enterTime: null,
    leaveTime: time
  }));
// /////////////////////
// epics
// /////////////////////

// /////////////////////
// thunks
// /////////////////////

/**
 * Async login. Keep in mind that redux-actions 2nd argument is the payload creator so we could not use it to create an
 * action as a function, need to create it ourselves
 *
 * @param username {string} - the username
 * @param password {string} - the user password
 * @param service {object} - the service that is used to login which is set by default to LoginService
 * @returns {*}
 */
export const doAsyncLogin = (username, password, service = LoginService) => createThunk(ASYNC_LOGIN, {
  SUCCEEDED: result => result
}, dispatch => {
  return service.login(username, password)
    .then(result => {
      dispatch(authActions.authSuccess(result.data));

      return result;
    });
});
// /////////////////////
// reducers
// /////////////////////
export const login = handleActions({
  [combineActions(ENTER_LOGIN_VIEW, LEAVE_LOGIN_VIEW)]: (state, action) => state.merge({
    ...pickAll(['currentView', 'enterTime', 'leaveTime'], action.payload)
  }),
  [`${ ASYNC_LOGIN }_${ ThunkSuffix.STARTED }`]       : state => state.merge({
    isLoggingIn   : true,
    isLoginInvalid: false
  }),
  [`${ ASYNC_LOGIN }_${ ThunkSuffix.SUCCEEDED }`]     : (state, action) => state.merge({
    isLoggedIn    : true,
    isLoggingIn   : false,
    isLoginInvalid: false
  }),
  [`${ ASYNC_LOGIN }_${ ThunkSuffix.FAILED }`]        : (state, action) => state.merge({
    isLoggedIn    : true,
    isLoggingIn   : false,
    isLoginInvalid: true
  })
}, initialState);