package utils

import (
	"io"
	"log"
	"time"

	"github.com/tarm/serial"
)

var (
	device     string
	baudrate   int
	bytesize   byte
	port       *serial.Port
	portOpened = false
)

func OpenPort(device string, baudrate int, bytesize byte) error {
	log.Println("opening port device:", device, ", baudrate=", baudrate, ", bytesize=", bytesize)
	config := &serial.Config{Name: device, Baud: baudrate, Size: bytesize, ReadTimeout: time.Second * 1}
	var err error
	port, err = serial.OpenPort(config)
	if err != nil {
		log.Fatalln("error in open serial port ", err)
		return err
	}
	log.Println("opened port ", port)
	portOpened = true
	return nil
}

func ReadPort() ([]byte, int) {
	buffer := make([]byte, 256)
	if !ServerRunning {
		return buffer, 0
	}
	count, err := port.Read(buffer)
	if err != nil && err != io.EOF {
		log.Println("error in read port ", err)
		//TODO: 3 time fail try to
	}
	return buffer, count
}

func IsPortOpen() bool {
	return portOpened
}