// GET /api/__seo__/resolve?url=<path and query>: the resolve answer through
// the layer's server (and its cache), for client-side navigation on a site
// whose proxy does not route /_seo/api/v1 to the backend. The browser uses
// it when public.seo.apiBase (NUXT_PUBLIC_SEO_API_BASE) is "/api/__seo__";
// the default stays the backend's same-origin /_seo/api/v1.
//
// 404 when the layer is off; 422 for a url that is not a path; 502 when the
// backend gives no usable answer. Never route-cached ('/api/__seo__/**'
// cache false) and never indexed.

import { seoServerConfig } from '../../lib/config.ts'
import { resolveCached } from '../../lib/resolve.ts'

export default defineEventHandler(async (event) => {
  setResponseHeaders(event, { 'cache-control': 'no-store', 'x-robots-tag': 'noindex' })
  if (!seoServerConfig(useRuntimeConfig(event)).enabled) throw createError({ statusCode: 404, statusMessage: 'Not Found' })
  const url = getQuery(event).url
  if (typeof url !== 'string' || !url.startsWith('/') || url.startsWith('//') || url.length > 2048) {
    throw createError({ statusCode: 422, statusMessage: 'Bad url' })
  }
  const answer = await resolveCached(event, url)
  if (!answer) throw createError({ statusCode: 502, statusMessage: 'No SEO answer' })
  return answer
})