const _ = require("lodash");
const Promise = require("bluebird");
const path = require("path");
const select = require(`unist-util-select`);
const fs = require(`fs-extra`);

exports.createPages = ({ graphql, actionCreators }) => {
  const { upsertPage } = actionCreators;

  return new Promise((resolve, reject) => {
    const pages = [];
    const blogPost = path.resolve("templates/template-blog-post.js");
    graphql(
      `
      {
        allMarkdownRemark(limit: 1000) {
          edges {
            node {
              slug
            }
          }
        }
      }
    `
    ).then(result => {
      if (result.errors) {
        console.log(result.errors);
        reject(result.errors);
      }

      // Create blog posts pages.
      _.each(result.data.allMarkdownRemark.edges, edge => {
        upsertPage({
          path: edge.node.slug, // required
          component: blogPost,
          context: {
            slug: edge.node.slug,
          },
        });
      });

      resolve();
    });
  });
};

// Add custom url pathname for blog posts.
exports.onNodeCreate = ({ node, actionCreators, getNode }) => {
  const { updateNode } = actionCreators;
  if (node.type === `File` && typeof node.slug === "undefined") {
    const parsedFilePath = path.parse(node.relativePath);
    const slug = `/${parsedFilePath.dir}/`;
    node.slug = slug;
    updateNode(node);
  } else if (
    node.type === `MarkdownRemark` && typeof node.slug === "undefined"
  ) {
    const fileNode = getNode(node.parent);
    node.slug = fileNode.slug;
    updateNode(node);
  }
};