import { revalidatePath } from 'next/cache'
import { NextRequest, NextResponse } from 'next/server'
import { createDirectus, rest, staticToken, readItem, readItems } from '@directus/sdk'

export async function POST(req: NextRequest) {
  const body = await req.json()

  if (body.secret !== process.env.REVALIDATE_SECRET) {
    return NextResponse.json({ error: 'Invalid secret' }, { status: 401 })
  }

  if (body.type === 'homepage') {
    revalidatePath('/')
    return NextResponse.json({ revalidated: true, path: '/' })
  }

  if (body.type === 'all') {
    const directus = createDirectus(process.env.DIRECTUS_URL!)
      .with(staticToken(process.env.DIRECTUS_TOKEN!))
      .with(rest())

    revalidatePath('/')

    const [categories, articles] = await Promise.all([
      directus.request(readItems('categories', { fields: ['slug'] })) as Promise<{ slug: string }[]>,
      directus.request(readItems('articles', {
        fields: ['slug', 'category.slug'],
        filter: { status: { _eq: 'published' } },
        limit: 500,
      })) as Promise<{ slug: string; category: { slug: string } }[]>,
    ])

    const paths = ['/']
    for (const cat of categories) {
      revalidatePath(`/${cat.slug}`)
      paths.push(`/${cat.slug}`)
    }
    for (const article of articles) {
      const p = `/${article.category.slug}/${article.slug}`
      revalidatePath(p)
      paths.push(p)
    }

    return NextResponse.json({ revalidated: true, paths: paths.slice(0, 20), total: paths.length })
  }

  const { article_id } = body
  if (!article_id) {
    return NextResponse.json({ error: 'Missing article_id' }, { status: 400 })
  }

  const directus = createDirectus(process.env.DIRECTUS_URL!)
    .with(staticToken(process.env.DIRECTUS_TOKEN!))
    .with(rest())

  const article = (await directus.request(
    readItem('articles', article_id, {
      fields: ['slug', 'category.slug'],
    })
  )) as { slug: string; category: { slug: string } } | null

  if (!article) {
    return NextResponse.json({ error: 'Article not found' }, { status: 404 })
  }

  const categorySlug = article.category.slug
  const { slug } = article

  revalidatePath('/')
  revalidatePath(`/${categorySlug}`)
  revalidatePath(`/${categorySlug}/${slug}`)

  return NextResponse.json({
    revalidated: true,
    paths: ['/', `/${categorySlug}`, `/${categorySlug}/${slug}`],
  })
}