---
import Breadcrumbs from '@/components/Breadcrumbs.astro'
import Container from '@/components/Container.astro'
import PostNavigation from '@/components/PostNavigation.astro'
import TableOfContents from '@/components/TableOfContents.astro'
import { badgeVariants } from '@/components/ui/badge'
import { Button } from '@/components/ui/button'
import { Separator } from '@/components/ui/separator'
import Layout from '@/layouts/Layout.astro'
import { formatDate, parseAuthors, readingTime } from '@/lib/utils'
import { Icon } from 'astro-icon/components'
import { Image } from 'astro:assets'
import { type CollectionEntry, getCollection } from 'astro:content'

export async function getStaticPaths() {
  const posts = (await getCollection('blog'))
    .filter((post) => !post.data.draft)
    .sort((a, b) => b.data.date.valueOf() - a.data.date.valueOf())
  return posts.map((post) => ({
    params: { slug: post.slug },
    props: post,
  }))
}
type Props = CollectionEntry<'blog'>

const posts = (await getCollection('blog'))
  .filter((post) => !post.data.draft)
  .sort((a, b) => b.data.date.valueOf() - a.data.date.valueOf())

function getPostIndex(slug: string): number {
  return posts.findIndex((post) => post.slug === slug)
}

function getNextPost(slug: string): Props | null {
  const postIndex = getPostIndex(slug)
  return postIndex !== -1 && postIndex < posts.length - 1
    ? posts[postIndex + 1]
    : null
}

function getPrevPost(slug: string): Props | null {
  const postIndex = getPostIndex(slug)
  return postIndex > 0 ? posts[postIndex - 1] : null
}

const currentPostSlug = Astro.params.slug
const nextPost = getNextPost(currentPostSlug)
const prevPost = getPrevPost(currentPostSlug)

const post = Astro.props
const { Content, headings } = await post.render()

const authors = await parseAuthors(post.data.authors ?? [])
---

<Layout
  title={post.data.title}
  description={post.data.description}
  image={post.data.image?.src ?? '/static/1200x630.png'}
>
  <Container class="flex flex-col gap-y-6">
    <Breadcrumbs
      items={[
        { href: '/blog', label: 'Blog', icon: 'lucide:archive' },
        { label: post.data.title, icon: 'lucide:file-text' },
      ]}
    />

    {
      post.data.image && (
        <Image
          src={post.data.image}
          alt={post.data.title}
          width={1200}
          height={630}
          class="object-cover"
        />
      )
    }

    <section class="flex flex-col gap-6 text-center">
      <div>
        <h1 class="mb-4 text-4xl font-bold leading-tight sm:text-5xl">
          {post.data.title}
        </h1>

        <div
          class="flex flex-wrap items-center justify-center gap-2 text-sm text-muted-foreground"
        >
          <div class="flex items-center gap-2">
            <span>{formatDate(post.data.date)}</span>
            <Separator orientation="vertical" className="h-4" />
            <span>{readingTime(post.body)}</span>
          </div>
        </div>
        <div class="mt-4 flex flex-wrap justify-center gap-2">
          {
            post.data.tags && post.data.tags.length > 0 ? (
              post.data.tags.map((tag) => (
                <a
                  href={`/tags/${tag}`}
                  class={badgeVariants({ variant: 'secondary' })}
                >
                  <Icon name="lucide:hash" class="size-3 -translate-x-0.5" />
                  {tag}
                </a>
              ))
            ) : (
              <span class="text-sm text-muted-foreground">
                No tags available
              </span>
            )
          }
        </div>
      </div>
    </section>

    {headings.length > 0 && <TableOfContents headings={headings} />}

    <article class="prose prose-neutral max-w-none dark:prose-invert">
      <Content />
    </article>

    <PostNavigation prevPost={prevPost} nextPost={nextPost} />
  </Container>

  <Button
    variant="outline"
    size="icon"
    className="group fixed bottom-8 right-8 z-50 hidden"
    id="scroll-to-top"
    title="Scroll to top"
    aria-label="Scroll to top"
  >
    <Icon
      name="lucide:arrow-up"
      class="mx-auto size-4 transition-all group-hover:-translate-y-0.5"
    />
  </Button>

  <script>
    document.addEventListener('astro:page-load', () => {
      const scrollToTopButton = document.getElementById('scroll-to-top')
      const footer = document.querySelector('footer')

      if (scrollToTopButton && footer) {
        scrollToTopButton.addEventListener('click', () => {
          window.scrollTo({ top: 0, behavior: 'smooth' })
        })

        window.addEventListener('scroll', () => {
          const footerRect = footer.getBoundingClientRect()
          const isFooterVisible = footerRect.top <= window.innerHeight

          scrollToTopButton.classList.toggle(
            'hidden',
            window.scrollY <= 300 || isFooterVisible,
          )
        })
      }
    })
  </script>
</Layout>