import { createSelector } from "reselect";
import { selectUser } from "selectors/user";

const _selectState = state => state.rewards || {};

export const selectUnclaimedRewardsByType = createSelector(
  _selectState,
  state => state.unclaimedRewardsByType
);

export const selectClaimedRewardsById = createSelector(
  _selectState,
  state => state.claimedRewardsById
);

export const selectClaimedRewards = createSelector(
  selectClaimedRewardsById,
  byId => Object.values(byId) || []
);

export const selectUnclaimedRewards = createSelector(
  selectUnclaimedRewardsByType,
  byType => Object.values(byType) || []
);

export const selectIsRewardEligible = createSelector(
  selectUser,
  user => user.can_claim_rewards
);

export const selectFetchingRewards = createSelector(
  _selectState,
  state => !!state.fetching
);

export const selectUnclaimedRewardValue = createSelector(
  selectUnclaimedRewards,
  rewards =>
    rewards.reduce((sum, reward) => {
      return sum + reward.reward_amount;
    }, 0)
);

export const selectHasClaimedReward = (state, props) => {
  const reward = selectRewardsByType(state)[props.reward_type];
  return reward && reward.transaction_id !== "";
};

export const makeSelectHasClaimedReward = () => {
  return createSelector(selectHasClaimedReward, claimed => claimed);
};

export const selectClaimsPendingByType = createSelector(
  _selectState,
  state => state.claimPendingByType
);

const selectIsClaimRewardPending = (state, props) => {
  return selectClaimsPendingByType(state, props)[props.reward_type];
};

export const makeSelectIsRewardClaimPending = () => {
  return createSelector(selectIsClaimRewardPending, isClaiming => isClaiming);
};

export const selectClaimErrorsByType = createSelector(
  _selectState,
  state => state.claimErrorsByType
);

const selectClaimRewardError = (state, props) => {
  return selectClaimErrorsByType(state, props)[props.reward_type];
};

export const makeSelectClaimRewardError = () => {
  return createSelector(selectClaimRewardError, errorMessage => errorMessage);
};

const selectRewardByType = (state, props) => {
  return selectUnclaimedRewardsByType(state)[props.reward_type];
};

export const makeSelectRewardByType = () => {
  return createSelector(selectRewardByType, reward => reward);
};