/**
 * Shared binding helpers for auto-materialized members (functions + views).
 *
 * The worker ROUTE URL a member is served at — `<url>/<folderSlug>/<slug>` — is
 * decoupled from the member's GRAPH layout (`/<origin>/{functions,views}/<slug>`,
 * a fixed kernel convention). `folderSlug` names only the URL segment.
 */

import type { FunctionBinding } from '@astrale-os/kernel-api/routed'

/** Join a worker-relative mount path onto the serving url (single slash). */
export function joinWorkerPath(url: string, mount: string): string {
  const base = url.replace(/\/+$/, '')
  return `${base}/${mount.replace(/^\/+/, '')}`
}

/**
 * Resolve a member's effective binding against the serving `url`. An explicit
 * `override.remoteUrl` wins; otherwise defaults to `<url>/<folderSlug>/<slug>`.
 * Same trailing-slash discipline as {@link joinWorkerPath} — a `url` ending in
 * `/` must not produce `//` (the kernel pins `iss` by exact string).
 */
export function resolveBinding(
  override: FunctionBinding | undefined,
  url: string,
  folderSlug: string,
  slug: string,
): FunctionBinding {
  const base = url.replace(/\/+$/, '')
  if (override) {
    return {
      ...override,
      remoteUrl: override.remoteUrl ?? `${base}/${folderSlug}/${slug}`,
    }
  }
  return { remoteUrl: `${base}/${folderSlug}/${slug}` }
}