package cli

import (
	"fmt"
	"os"

	"github.com/alyraffauf/tg/internal/app"
	"github.com/spf13/cobra"
	"github.com/spf13/cobra/doc"
)

// manCmd is hidden from `tg --help`: it is a build-time tool the Nix
// derivation invokes to generate man pages, not a user-facing command (cf.
// `gh`, which produces man pages via its Makefile rather than a visible
// subcommand).
func newManCommand(_ *app.Service) *cobra.Command {
	var markdown bool
	cmd := &cobra.Command{
		Use:    "man [directory]",
		Short:  "Generate man pages",
		Args:   cobra.ExactArgs(1),
		Hidden: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			dir := args[0]
			if err := os.MkdirAll(dir, 0o755); err != nil {
				return fmt.Errorf("create man page directory: %w", err)
			}
			if markdown {
				return doc.GenMarkdownTree(cmd.Root(), dir)
			}
			header := &doc.GenManHeader{
				Title:   "tg",
				Section: "1",
				Source:  "tg " + version,
			}
			return doc.GenManTree(cmd.Root(), header, dir)
		},
	}
	cmd.Flags().BoolVar(&markdown, "markdown", false, "Generate Markdown instead of man pages")
	return cmd
}