// /rss.xml: the Journal API's RSS 2.0 feed, served from the site origin.
// The visitor's x-forwarded-for is forwarded (plus the peer address) so the
// API's rate limiter keeps one bucket per visitor. 404 when journal.rss is
// false, 502 when the API does not answer.

export default defineEventHandler(async (event) => {
  const config = useRuntimeConfig(event)
  if ((config.public.journal as { rss?: boolean }).rss === false) {
    throw createError({ statusCode: 404, statusMessage: 'Not found' })
  }
  const base = (config.journal as { apiBase: string }).apiBase

  // Recorded by server/plugins/journal-client-address.ts before any route
  // cache hides the request headers.
  const forwarded =
    (event.context.journalForwardedFor as string | undefined) ||
    [getRequestHeader(event, 'x-forwarded-for'), getRequestIP(event)]
      .filter((v): v is string => typeof v === 'string' && v !== '')
      .join(', ')

  let body: string
  try {
    body = await $fetch<string>('/rss', {
      baseURL: base,
      responseType: 'text',
      headers: forwarded ? { 'x-forwarded-for': forwarded } : {},
    })
  } catch {
    setResponseStatus(event, 502)
    setResponseHeader(event, 'content-type', 'text/plain; charset=utf-8')
    return 'The feed is unavailable.'
  }

  setResponseHeader(event, 'content-type', 'application/rss+xml; charset=utf-8')
  return body
})