package cli

import (
	"fmt"

	"github.com/spf13/cobra"
)

func newCompletionCommand() *cobra.Command {
	return &cobra.Command{
		Use:   "completion [bash|zsh|fish|powershell]",
		Short: "Generate shell completion scripts",
		Args: func(cmd *cobra.Command, args []string) error {
			if err := cobra.ExactArgs(1)(cmd, args); err != nil {
				return usageError{err}
			}
			return nil
		},
		ValidArgs: []string{"bash", "zsh", "fish", "powershell"},
		RunE: func(cmd *cobra.Command, args []string) error {
			root := cmd.Root()
			out := cmd.OutOrStdout()
			switch args[0] {
			case "bash":
				return root.GenBashCompletion(out)
			case "zsh":
				return root.GenZshCompletion(out)
			case "fish":
				return root.GenFishCompletion(out, true)
			case "powershell":
				return root.GenPowerShellCompletion(out)
			default:
				return fmt.Errorf("unsupported shell %q", args[0])
			}
		},
	}
}