package rgb

import (
	"fmt"
	"strconv"

	"github.com/spf13/cobra"
	intdevice "github.com/wobkey/rgb/internal/device"
	"github.com/wobkey/rgb/internal/via"
)

var targetDevice string

func OpenDevice() (*via.Protocol, intdevice.Keyboard, error) {
	keyboards, err := intdevice.LoadKeyboards()
	if err != nil {
		return nil, intdevice.Keyboard{}, fmt.Errorf("load keyboards: %w", err)
	}

	devices, err := intdevice.Discover(keyboards)
	if err != nil {
		return nil, intdevice.Keyboard{}, fmt.Errorf("discover: %w", err)
	}

	if len(devices) == 0 {
		return nil, intdevice.Keyboard{}, fmt.Errorf("no VIA-compatible keyboard found")
	}

	var dev intdevice.Device
	if targetDevice != "" {
		for _, d := range devices {
			if d.Path == targetDevice {
				dev = d
				break
			}
		}
		if dev.Path == "" {
			return nil, intdevice.Keyboard{}, fmt.Errorf("device %s not found", targetDevice)
		}
	} else if len(devices) == 1 {
		dev = devices[0]
	} else {
		return nil, intdevice.Keyboard{}, fmt.Errorf("multiple devices found, use --device to specify")
	}

	proto, err := via.New(dev)
	if err != nil {
		return nil, intdevice.Keyboard{}, fmt.Errorf("open protocol: %w", err)
	}

	return proto, dev.Keyboard, nil
}

func ParseUint8(s string) (uint8, error) {
	v, err := strconv.ParseUint(s, 10, 8)
	if err != nil {
		return 0, fmt.Errorf("invalid value: %w", err)
	}
	return uint8(v), nil
}

func Init() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "rgb",
		Short: "RGB lighting commands",
	}
	cmd.Flags().StringVar(&targetDevice, "device", "", "HID device path to use")
	return cmd
}