package player

import (
	"context"
	"fmt"

	qrcode "github.com/skip2/go-qrcode"
)

// QRCodeSize is the default QR code image size in pixels.
const QRCodeSize = 256

// GenerateQRCode generates a QR code PNG image encoding the player UUID.
// The QR code encodes a URL in the format: felt://player/{uuid}
// This is intended for future PWA self-check-in via camera scan.
func (s *Service) GenerateQRCode(ctx context.Context, playerID string) ([]byte, error) {
	// Verify player exists
	_, err := s.GetPlayer(ctx, playerID)
	if err != nil {
		return nil, err
	}

	// Generate QR code with player URL
	url := fmt.Sprintf("felt://player/%s", playerID)
	png, err := qrcode.Encode(url, qrcode.Medium, QRCodeSize)
	if err != nil {
		return nil, fmt.Errorf("player: generate QR code: %w", err)
	}

	return png, nil
}