import {
  USER_LOGIN_SUCCESS, USER_LOGIN_FAILURE,
  USER_LOGOUT_SUCCESS, USER_LOGOUT_FAILURE,
  USER_DATA_SUCCESS, USER_DATA_FAILURE
} from '../constants/actionTypes';
import api from '../api/chartmill-rest';

export function login(username, password) {
  console.log('executing login...');
  return (dispatch, getState) => {
    if (getState().user.loggedIn) {
      return dispatch(loginFailure('Already logged in.'));
    }
    console.log('about to do the login api call');
    return api.login(username, password)
      .then(() => dispatch(loginSuccess))
      .catch(err => {
        dispatch(() => loginFailure(err === 401 ? 'Wrong credentials.' : 'Something went wrong.'));
      });
  };
}

function loginSuccess() {
  console.log('executing `loginSuccess`');
  return dispatch => {
    dispatch(userData);
    dispatch({
      type: USER_LOGIN_SUCCESS,
      payload: {
        loggedIn: true,
        error: null
      }
    });
  };
}

function loginFailure(msg) {
  console.log('executing `loginFailure`');
  return {
    type: USER_LOGIN_FAILURE,
    payload: {
      loggedIn: false,
      error: msg,
      data: {}
    }
  };
}

export function userData() {
  return dispatch => {
    return api.getUserData()
      .then(data => dispatch(userDataSuccess(data)))
      .catch(() => dispatch(userDataFailure()));
  };
}

export function logout() {
  return (dispatch, getState) => {
    if (!getState().user.loggedIn) {
      return dispatch(() => logoutFailure('Not logged in.'));
    }
    // TODO: logout api stuff
    return dispatch(logoutSuccess);
  };
}

function logoutSuccess() {
  return {
    type: USER_LOGOUT_SUCCESS,
    payload: {
      data: {},
      loggedIn: false,
      error: null
    }
  };
}

function logoutFailure(msg) {
  return {
    type: USER_LOGOUT_FAILURE,
    payload: {
      error: msg
    }
  };
}

function userDataSuccess(data) {
  return {
    type: USER_DATA_SUCCESS,
    payload: {
      loggedIn: true,
      data
    }
  };
}

function userDataFailure() {
  return {
    type: USER_DATA_FAILURE,
    payload: {
      loggedIn: false,
      data: {}
    }
  };
}