package devices

import (
	"errors"
	"fmt"
	"os"
)

const (
	GPIO          = "/sys/class/gpio"
	GPIO_EXPORT   = GPIO + "/export"
	GPIO_UNEXPORT = GPIO + "/unexport"
	// GPIO_FMT_DIRECTION = GPIO + "/direction"
)

var (
	// GPIO_ERROR_NOT_EXPORTED
	ErrGPIONotExported       error = errors.New("GPIO Not Exported")
	ErrGPIODirectionNotValue error = errors.New("GPIO Direction Not Value")
)

// GPIO Direction Mode
type GPIOMode int

const (
	DIRECTION_IN GPIOMode = iota
	DIRECTION_OUT
)

// GPIO Level Value
type GPIOValue int

const (
	LEVEL_LOW GPIOValue = iota
	LEVEL_HIGH
)

func GPIOExport(gpio int) error {
	buffer := fmt.Sprintf("%d", gpio)
	return os.WriteFile(GPIO_EXPORT, []byte(buffer), os.ModePerm)
}

func GPIOUnExport(gpio int) error {
	buffer := fmt.Sprintf("%d", gpio)
	return os.WriteFile(GPIO_UNEXPORT, []byte(buffer), os.ModePerm)
}