package git

import (
	"bytes"
	"context"
	"errors"
	"os/exec"
)

func IsGitRepo(ctx context.Context, wd string) (bool, string, error) {
	root, err := showRoot(ctx, wd)
	if err != nil {
		var exitErr *exec.ExitError
		if errors.As(err, &exitErr) {
			if exitErr.ExitCode() == 128 {
				return false, wd, nil
			}
		}

		return false, wd, err
	}

	return root != "", root, nil
}

func showRoot(ctx context.Context, wd string) (string, error) {
	cmd := exec.CommandContext(ctx, "git", "rev-parse", "--show-toplevel")
	cmd.Dir = wd
	rr, err := cmd.Output()
	if err != nil {
		return "", err
	}

	return string(bytes.TrimSpace(rr)), nil
}