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)
);