package ftdi_switch

import (
	"log"

	"github.com/ziutek/ftdi"
)

var (
	logger      log.Logger = *log.Default()
	ftdi_device *ftdi.Device
	data_byte   byte = 0
)

func imit() {
	logger.SetPrefix("ftdi_switch: ")
}

func start(vendor_id int, product_id int, init_value int) error {
	var err error
	ftdi_device, err = ftdi.OpenFirst(vendor_id, product_id, ftdi.ChannelAny)
	if err != nil {
		logger.Println(err)
	}

	err = ftdi_device.SetBitmode(0xff, ftdi.ModeBitbang)
	if err != nil {
		logger.Println(err)
	}

	err = ftdi_device.SetBaudrate(192)
	if err != nil {
		logger.Println(err)
	}
	err = write_byte(0)
	if err != nil {
		logger.Println(err)
	}
	return err
}

func stop() error {
	return ftdi_device.Close()
}

func write_bit(bit byte, value bool) error {
	if value {
		data_byte |= 1 << bit
	} else {
		data_byte &= ^(1 << bit)
	}
	return ftdi_device.WriteByte(data_byte)
}

func write_byte(data byte) error {
	data_byte = data
	return ftdi_device.WriteByte(data_byte)
}