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);
}

export function emitUtsMessageUTSObject(arg : UTSJSONObject) {
  uni.$emit(MessageChannel, arg);
}

export function emitUtsMessages(arg : UTSJSONObject, arg2 : string ){
  uni.$emit(MessageChannel, arg, arg2);
}

export function emitUtsMessageNoArgument(){
   uni.$emit(MessageChannel);
}

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 = JSON.stringify(spreadArgs[0])
      if ( typeof arg0 == "string" ) {
        revFromJS = arg0!
      }
    }
  })
}

export function onJsMessageOnce (messageChannel : string ) {
  revFromJS = ""
  uni.$once(messageChannel, function (...spreadArgs : Any) {
    if (spreadArgs.length > 0) {
      let arg0 = JSON.stringify(spreadArgs[0])
      if ( typeof arg0 == "string" ) {
        revFromJS = arg0!
      }
    }
  })
}

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

export function clearJsMessage() {
  revFromJS = ""
}