import * as q from '../../../backend/src/Model'
import { Action, Dispatch } from 'redux'
import { AppState } from '../reducers'
import { makePublishEvent, rendererEvents } from '../../../events'

export const clearRetainedTopic = () => (dispatch: Dispatch<any>, getState: () => AppState) => {
  const { selectedTopic } = getState().tree
  if (!selectedTopic) {
    return
  }

  dispatch(clearTopic(selectedTopic, false))
}

export const clearTopic = (topic: q.TreeNode<any>, recursive: boolean, subtopicClearLimit = 50) => (dispatch: Dispatch<any>, getState: () => AppState)  => {
  const { connectionId } = getState().connection
  if (!connectionId) {
    return
  }

  const publishEvent = makePublishEvent(connectionId)
  const mqttMessage = {
    topic: topic.path(),
    payload: null,
    retain: true,
    qos: 0 as 0,
  }
  console.log('deleting', topic.path())
  rendererEvents.emit(publishEvent, mqttMessage)

  if (recursive) {
    topic.childTopics()
      .filter(topic => Boolean(topic.message && topic.message.value))
      .slice(0, subtopicClearLimit)
      .forEach((topic) => {
        console.log('deleting', topic.path())
        const mqttMessage = {
          topic: topic.path(),
          payload: null,
          retain: true,
          qos: 0 as 0,
        }
        rendererEvents.emit(publishEvent, mqttMessage)
      })
  }
}