const path = require('path');
const PeopleMarkdownNode = 'PeopleMarkdownRemark';

/*
 * The root level content types (posts, authors, etc)
 * that power the bulk of our website
 * add content/CONTENT_TYPE folder for gatsby to pick it up
 */
const files = [
  ['approach', 'approach'],
  ['case-studies', 'case-study'],
  ['events', 'event'],
  ['careers', 'career'],
  ['locations', 'location'],
  ['people', 'person'],
  ['blog', 'post'],
  ['training', 'training'],
  ['services', 'service'],
  ['assets/images', 'images'],
  ['marketing', 'marketing'],
].map(([filePath, type]) => ({
  resolve: 'gatsby-source-filesystem',
  options: {
    path: path.join(__dirname, 'content', filePath),
    name: type,
  },
}));

const crypto = require('crypto');
const get = require('lodash.get');

//Did you notice we can highlight lines of code? This is also a really long comment to demonstrate scrolling.
const setNullToEmpty = data =>  Object.keys(data).reduce((merged, key) => {    if (key !== 'null') {      merged[key] = data[key] === null ? '' : data[key];    }    return merged;  }, {});
/*
 * This is a utility plugin that will enable
 * linking Markdown metadata for further linking
 * It's currently used to link Markdown.frontmatter.author
 * to an actual person, and "joins" on id
 * We could/should open source this and release it
 */
exports.onCreateNode = function onCreateNode(
  { node, boundActionCreators, loadNodeContent, getNode },
  pluginOptions
) {
  if (node.internal.type !== 'MarkdownRemark') {
    return;
  }

  const { createNode, createParentChildLink } = boundActionCreators;

  const { sourceInstanceName: type } = getNode(node.parent);
  if (type === 'person') {
    const { frontmatter } = node;
    const data = setNullToEmpty(frontmatter);
    const contentDigest = crypto
      .createHash('md5')
      .update(JSON.stringify(data))
      .digest('hex');

    const id = get(node, pluginOptions.id);

    const personNode = Object.assign(data, {
      id,
      children: [],
      parent: node.id,
      internal: {
        contentDigest,
        type: pluginOptions.type,
      },
    });

    createNode(personNode);
    createParentChildLink({ parent: node, child: personNode });
  }
};