package cmd

import (
	"errors"
	"fmt"

	"github.com/spf13/cobra"
	"github.com/warkanum/unitdore/config"
	"github.com/warkanum/unitdore/systemd"
)

var (
	updateOrder   int
	updateEnable  bool
	updateDisable bool
)

var updateCmd = &cobra.Command{
	Use:   "update <name>",
	Short: "Update a unit's config and recreate its service file",
	Args:  cobra.ExactArgs(1),
	RunE:  runUpdate,
}

func init() {
	updateCmd.Flags().IntVar(&updateOrder, "order", 0, "set startup order")
	updateCmd.Flags().BoolVar(&updateEnable, "enable", false, "enable the unit")
	updateCmd.Flags().BoolVar(&updateDisable, "disable", false, "disable the unit")
	rootCmd.AddCommand(updateCmd)
}

func runUpdate(cmd *cobra.Command, args []string) error {
	if updateEnable && updateDisable {
		return errors.New("--enable and --disable are mutually exclusive")
	}

	cfg, err := config.Load(configPath)
	if err != nil {
		return err
	}

	name := args[0]
	u := cfg.FindUnit(name)
	if u == nil {
		return fmt.Errorf("unit %q not found", name)
	}

	if cmd.Flags().Changed("order") {
		u.Order = updateOrder
		fmt.Printf("  order → %d\n", u.Order)
	}
	if updateEnable {
		u.Enabled = true
		u.DisabledReason = ""
		fmt.Printf("  enabled\n")
	}
	if updateDisable {
		u.Enabled = false
		fmt.Printf("  disabled\n")
	}

	if err := cfg.Save(configPath); err != nil {
		return err
	}

	prefix, suffix := cfg.Prefix, cfg.Suffix

	if systemd.IsInstalled(*u, prefix, suffix) {
		if err := systemd.Install(*u, prefix, suffix); err != nil {
			return fmt.Errorf("recreating service file: %w", err)
		}
		path, _ := systemd.UnitPath(*u, prefix, suffix)
		fmt.Printf("  ✓ service file recreated: %s\n", path)
	}

	return nil
}