import { PROTOCOL_MESHDROP_CHANNEL_NAME } from '../constants.js'
import { msgMeshdropEnvelopeEncoding } from './meshdrop-messages.js'

/**
 * Dedicated Protomux channel for meshdrop control/chunk frames.
 *
 * @param {import('protomux').Protomux} mux
 * @param {{
 *   onEnvelope?: (m: Record<string, unknown>, ch: import('protomux').Channel) => void
 *   onChannelOpened?: (ch: import('protomux').Channel, mux: import('protomux').Protomux) => void
 * }} [handlers]
 */
export function setupBareOsMeshdropChannel(mux, handlers = {}) {
  const chan = mux.createChannel({
    protocol: PROTOCOL_MESHDROP_CHANNEL_NAME,
    unique: true
  })
  if (!chan) return
  chan.addMessage({
    encoding: msgMeshdropEnvelopeEncoding,
    onmessage: (m, ch) =>
      handlers.onEnvelope ? handlers.onEnvelope(m, ch) : undefined
  })
  chan.open()
  if (typeof handlers.onChannelOpened === 'function') {
    handlers.onChannelOpened(chan, mux)
  }
}