package cli

import (
	"fmt"
	"os"

	"github.com/spf13/cobra"

	"galahad2lcd/internal/config"
	"galahad2lcd/internal/service"
)

func newSetCmd() *cobra.Command {
	var (
		configPath string
		input      string
		rotate     int
		speed      float64
		fps        float64
		noRestart  bool
	)

	cmd := &cobra.Command{
		Use:   "set",
		Short: "Update display settings and restart the service",
		Long: `Update the galahad2lcd configuration file and restart the systemd
service. Provide at least one flag to change a setting. Writing the default
configuration path requires root.`,
		Args: cobra.NoArgs,
		RunE: func(cmd *cobra.Command, _ []string) error {
			if !cmd.Flags().Changed("input") &&
				!cmd.Flags().Changed("rotate") &&
				!cmd.Flags().Changed("speed") &&
				!cmd.Flags().Changed("fps") {
				return fmt.Errorf("nothing to set; provide at least one of --input, --rotate, --speed, --fps")
			}

			cfg, err := config.Load(configPath)
			if err != nil {
				return err
			}
			if err := applyOverrides(cmd, &cfg, input, rotate, speed, fps); err != nil {
				return err
			}
			if err := cfg.Validate(); err != nil {
				return fmt.Errorf("invalid configuration: %w", err)
			}

			if configPath == config.DefaultConfigPath && os.Geteuid() != 0 {
				return fmt.Errorf("writing %s requires root (run with sudo)", configPath)
			}
			if err := cfg.Save(configPath); err != nil {
				return err
			}
			fmt.Printf("configuration saved to %s\n", configPath)

			if noRestart {
				return nil
			}

			ctx, stop := newSignalContext()
			defer stop()
			if err := service.New(config.ServiceName).Restart(ctx); err != nil {
				return err
			}
			fmt.Println("service restarted")
			return nil
		},
	}

	cmd.Flags().StringVar(&configPath, "config", config.DefaultConfigPath, "path to the configuration file")
	cmd.Flags().StringVar(&input, "input", "", "path to the media file")
	cmd.Flags().IntVar(&rotate, "rotate", 0, "rotation in degrees (0, 90, 180, 270)")
	cmd.Flags().Float64Var(&speed, "speed", 0, "playback speed (>1 slower, <1 faster)")
	cmd.Flags().Float64Var(&fps, "fps", 0, "output framerate (0 = auto)")
	cmd.Flags().BoolVar(&noRestart, "no-restart", false, "do not restart the service after saving")
	return cmd
}