import matter from 'gray-matter'
import Layout from '../components/Layout'
import BlogList from '../components/BlogList'

const Index = props => {
  return (
      <Layout
          pathname="/"
          siteTitle={props.title}
          siteDescription={props.description}
      >
        <section>
          <BlogList allBlogs={props.allBlogs} />
        </section>
      </Layout>
  )
}

export default Index

export async function getStaticProps() {
  // getting the website config
  const siteConfig = await import(`../data/config.json`)

  const webpackContext = require.context('../posts', true, /\.md$/)
  // the list of file names contained
  // inside the "posts" directory
  const keys = webpackContext.keys()
  const values = keys.map(webpackContext)

  // getting the post data from the files contained
  // in the "posts" folder
  const posts = keys.map((key, index) => {
    // dynamically creating the post slug
    // from file name
    const slug = key
        .replace(/^.*[\\\/]/, '')
        .split('.')
        .slice(0, -1)
        .join('.')

    // getting the .md file value associated
    // with the current file name
    const value = values[index]

    // parsing the YAML metadata and markdown body
    // contained in the .md file
    const document = matter(value.default)

    return {
      frontmatter: document.data,
      markdownBody: document.content,
      slug,
    }
  })

  return {
    props: {
      allBlogs: posts,
      title: siteConfig.default.title,
      description: siteConfig.default.description,
    },
  }
}