package rgbled

import (
	"sync"

	"github.com/go-flucky/flucky/pkg/internal/collect"
	"github.com/go-flucky/flucky/pkg/internal/prittyprint"
	"github.com/go-flucky/flucky/pkg/types"
)

// Blue makes all RGB-LEDs which are passed as parameters light up blue.
func Blue(rgbLEDs []RGBLED) error {
	color := types.LEDColorBlue
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// CustomColor makes all RGB-LEDs which are passed as parameters light up in
// custom color.
func CustomColor(rgbLEDs []RGBLED, color types.LEDColor) error {
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// Green makes all RGB-LEDs which are passed as parameters light up in green.
func Green(rgbLEDs []RGBLED) error {
	color := types.LEDColorGreen
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// Off turns all RGB-LEDs which are passes as parameters off.
func Off(rgbLEDs []RGBLED) error {
	color := types.LEDColorNone
	if err := operate(rgbLEDs, false, color); err != nil {
		return err
	}
	return nil
}

// Purple makes all RGB-LEDs which are passed as parameters light up in purple.
func Purple(rgbLEDs []RGBLED) error {
	color := types.LEDColorPurple
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// Red makes all RGB-LEDs which are passed as parameters light up in red.
func Red(rgbLEDs []RGBLED) error {
	color := types.LEDColorRed
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// Turquoise makes all RGB-LEDs which are passed as parameters light up in
// turquoise.
func Turquoise(rgbLEDs []RGBLED) error {
	color := types.LEDColorTurquoise
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// White makes all RGB-LEDs which are passed as parameters light up in white.
func White(rgbLEDs []RGBLED) error {
	color := types.LEDColorWhite
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

// Yellow makes all RGB-LEDs which are passed as parameters light up in yellow.
func Yellow(rgbLEDs []RGBLED) error {
	color := types.LEDColorYellow
	if err := operate(rgbLEDs, true, color); err != nil {
		return err
	}
	return nil
}

func operate(rgbLEDs []RGBLED, on bool, color types.LEDColor) error {

	errorChannel := make(chan error, len(rgbLEDs))

	wg := new(sync.WaitGroup)
	wg.Add(len(rgbLEDs))

	for _, rgbLED := range rgbLEDs {
		go func(rgbLED RGBLED, color types.LEDColor, on bool, errorChannel chan<- error, wg *sync.WaitGroup) {
			defer wg.Done()

			var err error

			switch color {
			case types.LEDColorBlue:
				err = rgbLED.Blue(on)
			case types.LEDColorGreen:
				err = rgbLED.Green(on)
			case types.LEDColorPurple:
				err = rgbLED.Purple(on)
			case types.LEDColorNone:
				err = rgbLED.Off()
			case types.LEDColorRed:
				err = rgbLED.Red(on)
			case types.LEDColorTurquoise:
				err = rgbLED.Turquoise(on)
			case types.LEDColorWhite:
				err = rgbLED.White(on)
			case types.LEDColorYellow:
				err = rgbLED.Yellow(on)
			default:
				err = rgbLED.Off()
			}

			if err != nil {
				errorChannel <- err
			}
		}(rgbLED, color, on, errorChannel, wg)
	}

	wg.Wait()

	errors := collect.Errors(errorChannel)
	if len(errors) > 0 {
		return prittyprint.FormatErrors(errors)
	}
	return nil
}