import type { GetStaticProps, GetStaticPaths, NextPage } from 'next'
import Link from 'next/link'
import Image from 'next/image'
import { MDXRemote } from 'next-mdx-remote'
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
import { faLink } from '@fortawesome/free-solid-svg-icons'
import date from 'date-and-time'
import Giscus from '@giscus/react'
import { useTheme } from 'next-themes'

import 'katex/dist/katex.min.css'

import { Head } from 'components/Head'
import { Header } from 'components/Header'
import type { FooterProps } from 'components/Footer'
import { Footer } from 'components/Footer'
import type { Post } from 'utils/blog'

interface BlogPostPageProps extends FooterProps {
  post: Post
}

const Heading = (
  props: React.DetailedHTMLProps<
    React.HTMLAttributes<HTMLHeadingElement>,
    HTMLHeadingElement
  >
): JSX.Element => {
  const { children, id = '' } = props
  return (
    <h2 {...props} className='group'>
      <Link
        href={`#${id}`}
        className='invisible !text-black group-hover:visible dark:!text-white'
      >
        <FontAwesomeIcon className='mr-2 inline h-4 w-4' icon={faLink} />
      </Link>
      {children}
    </h2>
  )
}

const BlogPostPage: NextPage<BlogPostPageProps> = (props) => {
  const { version, post } = props

  const { theme = 'dark' } = useTheme()

  return (
    <>
      <Head
        title={`${post.frontmatter.title} | Théo LUDWIG`}
        description={post.frontmatter.description}
      />

      <Header />
      <main className='break-wrap-words flex flex-1 flex-col flex-wrap items-center'>
        <div className='my-10 flex flex-col items-center text-center'>
          <h1 className='text-3xl font-semibold'>{post.frontmatter.title}</h1>
          <p className='mt-2' data-cy='blog-post-date'>
            {date.format(new Date(post.frontmatter.publishedOn), 'DD/MM/YYYY')}
          </p>
        </div>
        <div className='prose mb-10'>
          <div className='px-8'>
            <MDXRemote
              {...post.source}
              components={{
                h1: Heading,
                h2: Heading,
                h3: Heading,
                h4: Heading,
                h5: Heading,
                h6: Heading,
                img: (properties) => {
                  const { src = '', alt = 'Blog Image' } = properties
                  const source = src.replace('../public/', '/')
                  return (
                    <span className='flex flex-col items-center justify-center'>
                      <Image
                        src={source}
                        alt={alt}
                        width={1000}
                        height={1000}
                        className='h-auto w-auto'
                      />
                    </span>
                  )
                },
                a: (props) => {
                  const { href = '' } = props
                  if (href.startsWith('#')) {
                    return <a {...props} />
                  }
                  return (
                    <a target='_blank' rel='noopener noreferrer' {...props} />
                  )
                }
              }}
            />
            <Giscus
              id='comments'
              repo='theoludwig/theoludwig'
              repoId='MDEwOlJlcG9zaXRvcnkzNTg5NDg1NDQ='
              category='General'
              categoryId='DIC_kwDOFWUewM4CQ_WK'
              mapping='pathname'
              reactionsEnabled='1'
              emitMetadata='0'
              inputPosition='top'
              theme={theme}
              lang='en'
              loading='lazy'
            />
          </div>
        </div>
      </main>
      <Footer version={version} />
    </>
  )
}

export const getStaticProps: GetStaticProps<BlogPostPageProps> = async (
  context
) => {
  const slug = context?.params?.['slug']
  const { getPostBySlug } = await import('utils/blog')
  const post = await getPostBySlug(slug)
  if (post == null || (post != null && !post.frontmatter.isPublished)) {
    return {
      redirect: {
        destination: '/404',
        permanent: false
      }
    }
  }
  const { readPackage } = await import('read-pkg')
  const { version } = await readPackage()
  return { props: { version, post } }
}

export const getStaticPaths: GetStaticPaths = async () => {
  const { getPosts } = await import('utils/blog')
  const posts = await getPosts()
  return {
    paths: posts.map((post) => {
      return { params: { slug: post.slug } }
    }),
    fallback: false
  }
}

export default BlogPostPage
