package service

import (
	"fmt"
	"github.com/tarm/serial"
)

type SerialPrinter struct {
	Port *serial.Port
}

func NewSerialPrinter(portName string, baudRate int) (*SerialPrinter, error) {
	if baudRate <= 0 {
		baudRate = 9600 // EMD807 factory default
	}
	c := &serial.Config{Name: portName, Baud: baudRate}
	port, err := serial.OpenPort(c)
	if err != nil {
		return nil, fmt.Errorf("打开串口失败 %s: %w", portName, err)
	}
	return &SerialPrinter{Port: port}, nil
}

func (p *SerialPrinter) Write(data []byte) error {
	_, err := p.Port.Write(data)
	return err
}

func (p *SerialPrinter) Close() error {
	return p.Port.Close()
}