import { is_func } from './builtins.jsy'

export const pkt_clone = pkt =>
  Object.setPrototypeOf @
    structuredClone(pkt)
    Object.getPrototypeOf(pkt)

export const as_id = id => @
    'string' === typeof id ? id.split(/[, ]/, 2) // split on comma or space
  : id && id.id || id || null


export function as_send_pkt(args) ::
  let id, meta, body, flags
  let on_sent = is_func(args.at?.(-1)) ? args.pop() : null

  switch args.length ::
    case 0: return

    case 1:
      id = args[0] // ensure id_route and id_target are strings
      return {... args[0], 0:`${id[0]}`, 1:`${id[1]}`}

    case 2:
      // args shape is [[id_route, id_target], body]
      @ [id, body] = args
      break

    case 3:
      if 'string' === typeof args[0] ::
        // args shape is [id_route, id_target, body]
        @ [,, body] = id = args
      else ::
        // args shape is [[id_route, id_target], meta, body]
        @ [id, meta, body] = args
        flags = @{} meta
      break

    case 4: case 5:
      // args shape is [id_route, id_target, meta, body, flags]
      @ [,, meta,body,flags] = id = args
      flags = @{} ... flags, meta
      break

    default: throw new TypeError()

  id = as_id(id)
  return @{}
    __proto__: @{} id, on_sent
    0:`${id[0]}`
    1:`${id[1]}`
    ...flags
    body