import { UniUTSJS } from 'DCloudUniappRuntime'
import { NSNumber } from 'Foundation';

let MessageChannel : string = "UtsMessage"
var revFromJS = ""

export function getMessageChannel() : string {
  return MessageChannel
}

export function getRevJsMessage() : string {
  return revFromJS
}

export function emitUtsMessage(arg : string) {
  uni.$emit(MessageChannel, arg);
}

var callbackId : NSNumber | null = null
export function onJsMessage (messageChannel : string ) {
  revFromJS = ""
  if (callbackId != null) {
    uni.$off(messageChannel, callbackId!)
    callbackId = null
  }

  callbackId = uni.$on(messageChannel, function (...spreadArgs : Any) {
    if (spreadArgs.length > 0) {
      let arg0 = spreadArgs[0] as String | null
      if ( arg0 != null ){
        revFromJS = arg0!;
      }
    }
  })
}

export function onJsMessageOnce (messageChannel : string ) {
  revFromJS = ""
  uni.$once(messageChannel, function (...spreadArgs : Any) {
    if (spreadArgs.length > 0) {
      let arg0 = spreadArgs[0] as String | null
      if ( arg0 != null ){
        revFromJS = arg0!;
      }
    }
  })
}

export function offJsMessage(messageChannel : string) {
  if (callbackId != null) {
    uni.$off(messageChannel, callbackId!)
  }
}

export function clearJsMessage() {
  revFromJS = ""
}