/**
 * useSiteMeta — set page-level SEO + social meta with site defaults baked in.
 *
 * Builds absolute URLs from runtimeConfig.public.appUrl so og:image and og:url
 * resolve for crawlers. Defaults og:type=website, twitter:card=summary_large_image,
 * og:site_name=Ghost Guild. Set noindex:true to emit robots="noindex, nofollow".
 *
 * Pass a function (or refs in fields) to keep tags reactive when content loads
 * asynchronously via useFetch.
 */
export function useSiteMeta(input) {
  const runtimeConfig = useRuntimeConfig()
  const route = useRoute()
  const appUrl = (runtimeConfig.public.appUrl || '').replace(/\/$/, '')

  const resolve = () => (typeof input === 'function' ? input() : input) || {}

  const buildAbsolute = (path) => {
    if (!path) return undefined
    if (/^https?:\/\//i.test(path)) return path
    return `${appUrl}${path.startsWith('/') ? '' : '/'}${path}`
  }

  const titleGetter = () => resolve().title || 'Ghost Guild'
  const descGetter = () => resolve().description || undefined
  const isBareTitle = () => Boolean(resolve().bareTitle)
  const imageGetter = () => buildAbsolute(resolve().image || '/og/default.png')
  const typeGetter = () => resolve().type || 'website'
  const robotsGetter = () =>
    resolve().noindex ? 'noindex, nofollow' : undefined
  const canonicalGetter = () => buildAbsolute(route.path)

  useSeoMeta({
    title: titleGetter,
    description: descGetter,
    ogSiteName: 'Ghost Guild',
    ogTitle: titleGetter,
    ogDescription: descGetter,
    ogType: typeGetter,
    ogUrl: canonicalGetter,
    ogImage: imageGetter,
    ogImageWidth: 1200,
    ogImageHeight: 630,
    twitterCard: 'summary_large_image',
    twitterTitle: titleGetter,
    twitterDescription: descGetter,
    twitterImage: imageGetter,
    robots: robotsGetter,
  })

  useHead({
    link: [{ rel: 'canonical', href: canonicalGetter }],
  })

  if (isBareTitle()) {
    useHead({ titleTemplate: null })
  }
}