import ZmqClient from '@/lib/zmq/zmqClient'
import { WorkerCMD, ZmqCMD, type PublishMsg, type PubMsgData, } from './zmq'


const HEARTBEAT_TOPIC = 'HEARTBEAT'
const HEARTBEAT_INTERVAL = 3000
const STATUS_CHECK_INTERVAL = 1000
let messageTimeout = 20000

let heartClient: ZmqClient | null, subClient: ZmqClient | null, pubClient: ZmqClient | null
let subHost = '', pubHost = ''
let lastHeartbeatTime = 0
let statusTimerId: ReturnType<typeof setInterval> | null
let isConnectionError = false

function decodeMessage(data: Uint8Array) {
  return new TextDecoder().decode(data)
}

function updateHeartbeat() {
  lastHeartbeatTime = Date.now()
}

function changeConnectionStatus(hasError: boolean) {
  if (isConnectionError !== hasError) {
    isConnectionError = hasError
    console.log('ZMQ连接状态更新:', hasError ? '断开' : '连接')
    postMessage({ cmd: ZmqCMD.STATUS, community: hasError })
  }
}

function monitorConnection() {
  if (statusTimerId) return

  lastHeartbeatTime = Date.now()
  statusTimerId = setInterval(() => {
    const currentTime = Date.now()
    const hasError = currentTime - lastHeartbeatTime > HEARTBEAT_INTERVAL
    changeConnectionStatus(hasError)
  }, STATUS_CHECK_INTERVAL)
}

function stopMonitoringConnection() {
  if (statusTimerId) {
    clearInterval(statusTimerId)
    statusTimerId = null
  }
  changeConnectionStatus(false)
}

function disconnect() {
  if (subClient) {
    subClient.close(subHost, handleZmqMessage)
    subClient = null
  }

  if (heartClient) {
    heartClient.unsubscribe(HEARTBEAT_TOPIC)
    heartClient.close(subHost, updateHeartbeat)
    heartClient = null
  }

  if (pubClient) {
    pubClient.close(pubHost)
    pubClient = null
  }

  stopMonitoringConnection()
}

function handleZmqMessage(topic: Uint8Array, msg: Uint8Array) {
  try {
    if (msg instanceof Uint8Array) {
      const jsonMessage = decodeMessage(msg) as string
      postMessage({
        topic: decodeMessage(topic),
        cmd: ZmqCMD.JSON_MSG,
        msg: jsonMessage
      })
      const parsedMessage = JSON.parse(jsonMessage) as PubMsgData
      // traceMessages.get(parsedMessage.id)
      const curTraceMessages = traceMessages.get(parsedMessage.id)
      if (parsedMessage.id && !!curTraceMessages) {
        if (curTraceMessages.isAlwaysListen || parsedMessage.result === 'progress') {
          // 重置消息超时时间
          const val = traceMessages.get(parsedMessage.id)
          if (val) {
            val.timestamp = Date.now()
          }
          traceMessages.set(parsedMessage.id, val)
        } else {
          traceMessages.delete(parsedMessage.id)
        }
      }
    }
  } catch (e) {
    console.error('handleZmqMessage error:', e)
  }
}

function connect(host: string) {
  disconnect()

  subHost = `ws://${host}:15555`
  subClient = new ZmqClient('sub')
  subClient.zmqSub(subHost, handleZmqMessage)

  heartClient = new ZmqClient('sub')
  heartClient.zmqSub(subHost, updateHeartbeat)
  heartClient.subscribe(HEARTBEAT_TOPIC)
  monitorConnection()

  pubHost = `ws://${host}:15556`
  pubClient = new ZmqClient('pub')
  pubClient.zmqPub(pubHost)
  setInterval(() => {
    const now = Date.now()
    traceMessages.forEach((val, id) => {
      if (now - val.timestamp > messageTimeout) {
        console.warn(`Message ${id} timed out.`)
        postMessage({
          cmd: ZmqCMD.TIMEOUT,
          topic: val.topic.replace(/^web\//, 'server/'),
          msg: id
        })
        traceMessages.delete(id)
      }
    })
  }, 1000)
}

const traceMessages = new Map<string, any>()

self.onmessage = function (event) {
  const { cmd, topic, msg, isTimeout = false, isAlwaysListen } = event.data

  switch (cmd) {
    case WorkerCMD.START:
      connect(msg)
      break
    case WorkerCMD.SET_TIMEOUT:
      messageTimeout = msg
      break
    case WorkerCMD.SUBSCRIBE:
      subClient?.subscribe(topic)
      break
    case WorkerCMD.UNSUBSCRIBE:
      subClient?.unsubscribe(topic)
      break
    case WorkerCMD.PUBLISH:
      if (!msg) throw new Error('msg is required')
      if (isTimeout) {
        const parseMsg = JSON.parse(msg) as PublishMsg<string>
        traceMessages.set(parseMsg.id, {
          timestamp: Date.now(),
          topic: topic,
          isAlwaysListen,
        })
      }
      pubClient?.publishStr(topic, msg)
      break
    case WorkerCMD.STOP:
      disconnect()
      break
  }
}