freeCodeCamp/common/app/routes/challenges/components/map/Show.jsx

import React, { PropTypes } from 'react';
import { compose } from 'redux';
import { contain } from 'redux-epic';
import { connect } from 'react-redux';
import PureComponent from 'react-pure-render/component';
import { createSelector } from 'reselect';

import Map from './Map.jsx';
import {
  clearFilter,
  updateFilter,
  fetchChallenges
} from '../../redux/actions';

const bindableActions = {
  clearFilter,
  fetchChallenges,
  updateFilter
};

const superBlocksSelector = createSelector(
  state => state.challengesApp.superBlocks,
  state => state.entities.superBlock,
  state => state.entities.block,
  state => state.entities.challenge,
  (superBlocks, superBlockMap, blockMap, challengeMap) => {
    if (!superBlockMap || !blockMap || !challengeMap) {
      return {
        superBlocks: []
      };
    }
    return {
      superBlocks: superBlocks
        .map(superBlockName => superBlockMap[superBlockName])
        .map(superBlock => ({
          ...superBlock,
          blocks: superBlock.blocks
            .map(blockName => blockMap[blockName])
            .map(block => ({
              ...block,
              challenges: block.challenges
                .map(dashedName => challengeMap[dashedName])
            }))
        }))
    };
  }
);

const mapStateToProps = createSelector(
  superBlocksSelector,
  state => state.challengesApp.filter,
  ({ superBlocks }, filter) => {
    return {
      superBlocks,
      filter
    };
  }
);

const fetchOptions = {
  fetchAction: 'fetchChallenges',
  isPrimed({ superBlocks }) {
    return Array.isArray(superBlocks) && superBlocks.length > 1;
  }
};

export class ShowMap extends PureComponent {
  static displayName = 'ShowMap';
  static propTypes = {
    clearFilter: PropTypes.func,
    filter: PropTypes.string,
    superBlocks: PropTypes.array,
    updateFilter: PropTypes.func
  };

  render() {
    return (
      <Map { ...this.props } />
    );
  }
}

export default compose(
  connect(mapStateToProps, bindableActions),
  contain(fetchOptions)
)(ShowMap);