package cli

import (
	"fmt"
	"os"
	"path/filepath"
	"text/tabwriter"

	"github.com/spf13/cobra"
)

var runtimeCmd = &cobra.Command{
	Use:   "runtime",
	Short: "Manage runtime configurations",
}

var runtimeListCmd = &cobra.Command{
	Use:   "list",
	Short: "List available runtimes",
	RunE:  runRuntimeList,
}

func init() {
	runtimeCmd.AddCommand(runtimeListCmd)
}

func runRuntimeList(cmd *cobra.Command, args []string) error {
	dir := configDir()
	runtimesDir := filepath.Join(dir, "runtimes")
	imagesDir := filepath.Join(dir, "images")

	entries, err := os.ReadDir(runtimesDir)
	if err != nil {
		if os.IsNotExist(err) {
			fmt.Println("No runtimes configured. Run 'at-rund init' first.")
			return nil
		}
		return err
	}

	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintln(w, "RUNTIME\tCONFIG\tIMAGE\tSTATUS")

	for _, e := range entries {
		if filepath.Ext(e.Name()) != ".nix" {
			continue
		}

		name := e.Name()[:len(e.Name())-4]
		configPath := filepath.Join(runtimesDir, e.Name())
		imagePath := filepath.Join(imagesDir, name)

		status := "not built"
		if _, err := os.Stat(filepath.Join(imagePath, "rootfs.ext4")); err == nil {
			status = "ready"
		} else if _, err := os.Stat(imagePath); err == nil {
			status = "partial"
		}

		fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", name, configPath, imagePath, status)
	}

	w.Flush()
	return nil
}