// Links to the site's own pages from absolute CMS URLs: a URL on the site
// URL's origin (or on the request origin) becomes its path, so it renders
// as a NuxtLink; another http(s) URL stays as it is, and anything else
// (javascript:, data: …) becomes '' so it is never rendered as a link.
// Pure; names start with `seo` because app/utils is auto-imported.

export function seoSitePath(url: string, ...origins: Array<string | undefined | null>): string {
  if (typeof url !== 'string' || url === '') return ''
  if (url.startsWith('/') && !url.startsWith('//')) return url
  let parsed: URL
  try {
    parsed = new URL(url)
  } catch {
    return ''
  }
  if (parsed.protocol !== 'https:' && parsed.protocol !== 'http:') return ''
  for (const o of origins) {
    if (!o) continue
    try {
      if (new URL(o).origin === parsed.origin) return `${parsed.pathname}${parsed.search}` || '/'
    } catch {
      // not a URL
    }
  }
  return url
}