import { SerialPort } from 'serialport'
import { InterByteTimeoutParser }  from '@serialport/parser-inter-byte-timeout'
import config from './config.js'
import sendMsg from './ipcRendererManager'
import NMEAHandler from './api/NMEAHandler'

const DEFAULT_BAUDRATE = 115200
const getSerialPortConstructorArguments = (ports) => {
  // 很多电脑自带COM1接口，过滤掉COM1口
  ports = ports.filter((port) => port.path != 'COM1')
  if (ports.length == 0) return

  const serialport = config.get('serialport')
  const path       = ( serialport && serialport.path )     ? serialport.path     : ports[0].path
  const baudRate   = ( serialport && serialport.baudRate ) ? serialport.baudRate : DEFAULT_BAUDRATE
  return { path, baudRate }
}

const openSerialport = (ports) => {
  try {
    const constructorArguments = getSerialPortConstructorArguments(ports)
    if (!constructorArguments) {
      console.error('设备未连接')
      return
    }

    const { path, baudRate } = constructorArguments

    const serialPort         = new SerialPort({ path, baudRate })
    const parser             = serialPort.pipe(new InterByteTimeoutParser({interval: 300}))

    NMEAHandler.on('received' , (nmeaStr) => {
      sendMsg('NMEA_RECEIVED', nmeaStr)
    })

    NMEAHandler.on('handled' , (nmeaObj) => {
      sendMsg('NMEA_HANDLED', JSON.stringify(nmeaObj))
    })

    parser.on('data', (data) => NMEAHandler.handle(data.toString()))
  } catch (error) {
    console.error(error);
  }
}

SerialPort.list().then(
  ports => openSerialport(ports),
  err => console.error(err)
)