import { createSelector } from "reselect";

export const _selectState = state => state.user || {};

export const selectAuthenticationIsPending = createSelector(
  _selectState,
  state => state.authenticationIsPending
);

export const selectUserIsPending = createSelector(
  _selectState,
  state => state.userIsPending
);

export const selectUser = createSelector(
  _selectState,
  state => state.user || {}
);

export const selectEmailToVerify = createSelector(
  _selectState,
  state => state.emailToVerify
);

export const selectUserHasEmail = createSelector(
  selectUser,
  selectEmailToVerify,
  (user, email) => (user && user.has_email) || email
);

export const selectUserIsRewardEligible = createSelector(
  selectUser,
  user => user && user.is_reward_eligible
);

export const selectUserIsRewardApproved = createSelector(
  selectUser,
  user => user && user.is_reward_approved
);

export const selectEmailNewIsPending = createSelector(
  _selectState,
  state => state.emailNewIsPending
);

export const selectEmailNewErrorMessage = createSelector(
  _selectState,
  state => state.emailNewErrorMessage
);

export const selectEmailNewDeclined = createSelector(
  _selectState,
  state => state.emailNewDeclined
);

export const selectEmailVerifyIsPending = createSelector(
  _selectState,
  state => state.emailVerifyIsPending
);

export const selectEmailVerifyErrorMessage = createSelector(
  _selectState,
  state => state.emailVerifyErrorMessage
);

export const selectUserIsVerificationCandidate = createSelector(
  selectUserIsRewardEligible,
  selectUserIsRewardApproved,
  selectEmailToVerify,
  selectUser,
  (isEligible, isApproved, emailToVerify, user) => emailToVerify && user
);

export const selectUserIsAuthRequested = createSelector(
  selectEmailNewDeclined,
  selectAuthenticationIsPending,
  selectUserIsVerificationCandidate,
  selectUserHasEmail,
  (isEmailDeclined, isPending, isVerificationCandidate, hasEmail) =>
    !isEmailDeclined && (isPending || !hasEmail || isVerificationCandidate)
);