/**
 * BoundMethod → MountableContract translator.
 *
 * The narrow view carries only what the server's mount planner reads —
 * `ref` plus optional `binding` — because the SDK's SdkDispatcher
 * handles dispatch via KernelAPI.call, not via runtime contract hooks.
 */

import type {
  AuthPolicy,
  FunctionBinding,
  MountableContract,
  RouteBinding,
} from '@astrale-os/kernel-api/routed'
import type { BoundMethod } from '@astrale-os/kernel-core/domain'

import type { AnyRemoteHandler } from '../method/single.js'

export function toSdkContract(method: BoundMethod<AnyRemoteHandler>): MountableContract {
  const handler = method.handler as {
    route?: RouteBinding
    remoteUrl?: string
    auth?: AuthPolicy
  }
  const binding = extractBinding(handler)
  return binding === undefined ? { ref: method.ref } : { ref: method.ref, binding }
}

export function extractBinding(handler: {
  route?: RouteBinding
  remoteUrl?: string
  auth?: AuthPolicy
}): FunctionBinding | undefined {
  const { route, remoteUrl, auth } = handler
  if (route === undefined && remoteUrl === undefined && auth === undefined) return undefined
  const binding: FunctionBinding = {}
  if (remoteUrl !== undefined) binding.remoteUrl = remoteUrl
  if (route !== undefined) binding.route = route
  if (auth !== undefined) binding.auth = auth
  return binding
}