import { createSelector } from 'reselect';

export const userSelector = createSelector(
  state => state.app.user,
  state => state.entities.user,
  (username, userMap) => ({
    user: userMap[username] || {}
  })
);

export const firstChallengeSelector = createSelector(
  state => state.entities.challenge,
  state => state.entities.block,
  state => state.entities.superBlock,
  state => state.challengesApp.superBlocks,
  (challengeMap, blockMap, superBlockMap, superBlocks) => {
    if (
      !challengeMap ||
      !blockMap ||
      !superBlockMap ||
      !superBlocks
    ) {
      return {};
    }
    return challengeMap[
      blockMap[
        superBlockMap[
          superBlocks[0]
        ].blocks[0]
      ].challenges[0]
    ];
  }
);