const path = require('path');

exports.createPages = ({ boundActionCreators, graphql }) => {
  const { createPage } = boundActionCreators;

  const blogPostTemplate = path.resolve(`src/templates/post.js`);
  return graphql(`{
    allMarkdownRemark(
      sort: { order: DESC, fields: [frontmatter___date] }
      limit: 1000
    ) {
      edges {
        node {
          html
          id
          frontmatter {
            date
            path
            title
          }
        }
      }
    }
  }`)
    .then(result => {
      if (result.errors) {
        return Promise.reject(result.errors)
      }

      const posts = result.data.allMarkdownRemark.edges;

      // Create pages for each markdown file.
      posts.forEach(({ node }, index) => {
        createPage({
          path: node.frontmatter.path,
          component: blogPostTemplate,
        });
      });

      return posts;
    })
};