import { parse } from 'cookie'

import type { Route } from './+types/authorize'

export async function loader({ request, context }: Route.LoaderArgs) {
  const cookies = parse(request.headers.get('Cookie') || '')
  const url = new URL(request.url)
  const redirect = new URL('/', url.origin)
  const issuerUrl = new URL('/authorize', context.cloudflare.env.ISSUER_URL)
  issuerUrl.search = url.search
  redirect.search = url.search

  if (!cookies.session_id) {
    return new Response(null, {
      status: 302,
      headers: {
        Location: redirect.toString()
      }
    })
  }

  try {
    const r = await fetch(issuerUrl.toString(), {
      method: 'GET',
      headers: new Headers([
        ['Content-Type', 'application/json'],
        ['Cookie', request.headers.get('Cookie') as string]
      ]),
      redirect: 'manual'
    })

    if (r.status === 400) {
      return new Response(null, {
        status: 302,
        headers: {
          Location: redirect.toString()
        }
      })
    }

    return new Response(await r.text(), {
      status: r.status,
      headers: r.headers
    })
  } catch {
    return new Response(null, { status: 500 })
  }
}