import { useRouter } from 'next/router'
import ErrorPage from 'next/error'
import Container from '../../components/container'
import PostBody from '../../components/post-body'
import Header from '../../components/header'
import PostHeader from '../../components/post-header'
import SectionSeparator from '../../components/section-separator'
import Layout from '../../components/layout'
import { getByUrl, getByHandle } from '../../lib/api'
import PostTitle from '../../components/post-title'
import Head from 'next/head'
import { EXAMPLE_TOOL_NAME } from '../../lib/constants'
import Tags from '../../components/tags'
import PostType from '../../types/postType'

type Props = {
  post: PostType
  preview: boolean
}

export default function Post({ post, preview }: Props) {
  const router = useRouter()

  if (!router.isFallback && !post?.url) {
    return <ErrorPage statusCode={404} />
  }

  return (
    <Layout preview={preview}>
      <Container>
        <Header />
        {router.isFallback ? (
          <PostTitle>Loading…</PostTitle>
        ) : (
          <>
            <article>
              <Head>
                <title>
                  {post.title} | Next.js Blog Example with {EXAMPLE_TOOL_NAME}
                </title>
                <meta property="og:image" content={post.featuredImage} />
              </Head>
              <PostHeader
                title={post.title}
                coverImage={post.featuredImage}
                date={post.date}
                author={post.author}
                categories={post.categories}
              />
              <PostBody content={post.content} />
              <footer>
                {post.tags?.length > 0 && <Tags tags={post.tags} />}
              </footer>
            </article>

            <SectionSeparator />
          </>
        )}
      </Container>
    </Layout>
  )
}

export async function getStaticPaths({ preview }: { preview: boolean }) {
  const data = await getByHandle('blogList', preview)

  return {
    paths: data.blogListItems.map((post) => ({
      // Remove starting and ending slash from url
      params: { slug: post.url.replace(/^\/|\/$/g, '') },
    })),
    fallback: false,
  }
}

type Params = {
  slug: string
}

export async function getStaticProps({
  params,
  preview,
}: {
  params: Params
  preview: boolean
}) {
  // Adding starting slash to the URL again
  const data = await getByUrl(encodeURIComponent(`/${params.slug}`), preview)

  return {
    props: {
      post: data,
      preview: preview || null,
    },
  }
}
