// Which requests the Nitro SEO middleware resolves. Pure, so `node --test`
// drives it directly; the name starts with `is` like Nuxt's own helpers and
// is unique enough for the auto-import into the consuming app.

/**
 * File extensions that are never pages: build assets, images, fonts, data
 * and the root files (robots.txt, sitemap.xml, verification files), which
 * server/middleware/seo-root.ts handles.
 */
const ASSET_EXTENSIONS = new Set([
  'js', 'mjs', 'cjs', 'css', 'map', 'json', 'xml', 'txt', 'html', 'htm', 'xsl', 'webmanifest',
  'ico', 'png', 'jpg', 'jpeg', 'gif', 'webp', 'avif', 'svg', 'bmp', 'tif', 'tiff',
  'woff', 'woff2', 'ttf', 'otf', 'eot',
  'mp3', 'mp4', 'webm', 'ogg', 'wav', 'mov',
  'pdf', 'zip', 'gz', 'br', 'wasm',
])

/**
 * True when `path` (path and query, as h3's event.path) is a page the SEO
 * middleware resolves: not Nuxt's or the layers' internal paths (/_nuxt,
 * /__nuxt_error, /_journal, /_seo …), not /api, and not a file with one of
 * the asset extensions, unless the extension is listed in `resolveFiles`
 * (module option seo.resolveFiles, default ['pdf'], so an old PDF address
 * can still redirect). Pages a Nuxt route renders under a dotted path (an
 * author slug with ".com") are still resolved by the route middleware.
 */
export function isPagePath(path: string, resolveFiles: readonly string[] = []): boolean {
  if (typeof path !== 'string' || !path.startsWith('/') || path.startsWith('//')) return false
  const pathname = (path.split('?')[0] ?? '').split('#')[0] ?? ''
  if (pathname.startsWith('/_')) return false
  if (pathname === '/api' || pathname.startsWith('/api/')) return false
  const last = pathname.slice(pathname.lastIndexOf('/') + 1)
  const dot = last.lastIndexOf('.')
  if (dot > 0) {
    const ext = last.slice(dot + 1).toLowerCase()
    if (ASSET_EXTENSIONS.has(ext) && !resolveFiles.map((e) => e.toLowerCase()).includes(ext)) return false
  }
  return true
}