// Endpoints come from env, never hardcoded.
//
// In local dev VITE_API_URL is set at build time and Vite replaces the
// import.meta.env reference inline. In deployed/sandbox bundles VITE_API_URL is
// a runtime Worker binding — invisible to Vite at build time — so it's undefined
// in the bundle. We fall back to the current origin + /api, which is correct
// because the fabric dispatcher routes every /api/* path to the API on the same
// host. (VITE_API_BASE_URL is accepted as a legacy alias for local dev.)
export function apiUrl(): string {
  if (typeof window !== 'undefined' && (window as Window & { __E2E_API_URL?: string }).__E2E_API_URL) {
    return (window as Window & { __E2E_API_URL?: string }).__E2E_API_URL as string
  }
  const buildTime = import.meta.env.VITE_API_URL ?? import.meta.env.VITE_API_BASE_URL
  if (import.meta.env.SSR) {
    // SSR context: the auth client is only consumed in the browser. Return the
    // build-time var when available or a placeholder so SSR never throws.
    return buildTime ?? '/__api'
  }
  // Client: build-time var (local dev) or derive from the current origin. Better
  // Auth's client requires an absolute base URL, so never return a bare relative
  // '/api' here — '/api/auth' throws "Invalid base URL".
  return buildTime ?? `${window.location.origin}/api`
}