package ws2812b

import (
	"errors"

	"github.com/jgarff/rpi_ws281x/golang/ws2811"
)

type LED struct {
	GPIO       int
	Count      int
	Brightness int
	IsInit     bool
}

var led *LED

func Init(gpio, count, brightness int) (*LED, error) {
	if led != nil && led.IsInit == true {
		ws2811.Clear()
		ws2811.Fini()
	}

	err := ws2811.Init(gpio, count, brightness)
	if err != nil {
		led = nil
		return nil, err
	}

	led = &LED{
		GPIO:       gpio,
		Count:      count,
		Brightness: brightness,
		IsInit:     true,
	}

	return led, nil
}

func IsInit() bool {
	if led == nil {
		return false
	}
	return led.IsInit
}

func Close() {
	ws2811.Clear()
	ws2811.Fini()
	led.IsInit = false
}

func ClearAll() {
	ws2811.Clear()
}

func Len() int {
	if led == nil {
		return 0
	}
	return led.Count
}

func WriteColor(pos int, color uint32) error {
	if pos < 0 || pos > led.Count {
		return errors.New("position out of range")
	}

	ws2811.SetLed(pos, color)
	if err := ws2811.Render(); err != nil {
		ws2811.Clear()
		return err
	}

	return nil
}