package cli

import (
	"fmt"
	"runtime"

	"github.com/spf13/cobra"
)

// rootCmd builds the command tree. Configuration comes from the
// environment (see internal/config), not from flags: the bot runs in a
// container, where the environment is the interface, and one source of
// truth means there is no precedence rule to get wrong.
func rootCmd(version string) *cobra.Command {
	root := &cobra.Command{
		Use:   appname,
		Short: appname + " — a SimpleX Chat bot that answers arithmetic",
		Long: appname + " is a SimpleX Chat bot that answers arithmetic.\n\n" +
			"It runs the simplex-chat command-line client, which must be on\n" +
			"PATH. Configuration is read from the environment and from an\n" +
			"optional .env file in the working directory. See README.md\n" +
			"for the full list of variables.",
		SilenceUsage: true,
		// Without this, cobra prints the error itself and main prints
		// it again.
		SilenceErrors: true,
	}

	root.AddCommand(runCmd(version), versionCmd(version))

	return root
}

func versionCmd(version string) *cobra.Command {
	return &cobra.Command{
		Use:   "version",
		Short: "print the version and exit",
		Args:  cobra.NoArgs,
		RunE: func(cmd *cobra.Command, _ []string) error {
			_, err := fmt.Fprintf(cmd.OutOrStdout(), "%s %s %s/%s\n",
				appname, version, runtime.GOOS, runtime.GOARCH)
			if err != nil {
				return fmt.Errorf("writing version: %w", err)
			}

			return nil
		},
	}
}