// Runtime configuration read once from the served index.html. The Go server
// (boardwalk) writes the configured backend.uri into the summer-admin-base
// meta; the SPA derives its router base and API base from it (D-02, D-03).
export const DEFAULT_BASE = '/backend'
const TOKEN = '__SUMMER_ADMIN_BASE__'

export function readBase(doc: Document = document): string {
  const content = doc.querySelector<HTMLMetaElement>('meta[name="summer-admin-base"]')?.content.trim() ?? ''
  if (content === '' || content === TOKEN || !content.startsWith('/')) {
    return DEFAULT_BASE
  }
  const trimmed = content.replace(/\/+$/, '')
  return trimmed === '' ? DEFAULT_BASE : trimmed
}

const base = readBase()

export const runtime = {
  /** Admin mount path, for example /backend. */
  base,
  /** Admin API root, the mount path plus /api/v1. */
  api: `${base}/api/v1`,
} as const