package gui

import (
	"os"
	"path/filepath"
)

// updateRecentRepoList registers the fact that we opened lazygit in this repo,
// so that we can open the same repo via the 'recent repos' menu
func (gui *Gui) updateRecentRepoList() error {
	isBareRepo, err := gui.git.Status.IsBareRepo()
	if err != nil {
		return err
	}

	if isBareRepo {
		// we could totally do this but it would require storing both the git-dir and the
		// worktree in our recent repos list, which is a change that would need to be
		// backwards compatible
		gui.c.Log.Info("Not appending bare repo to recent repo list")
		return nil
	}

	recentRepos := gui.c.GetAppState().RecentRepos
	currentRepo, err := os.Getwd()
	if err != nil {
		return err
	}
	known, recentRepos := newRecentReposList(recentRepos, currentRepo)
	gui.IsNewRepo = known
	// TODO: migrate this file to use forward slashes on all OSes for consistency
	// (windows uses backslashes at the moment)
	gui.c.GetAppState().RecentRepos = recentRepos
	return gui.c.SaveAppState()
}

// newRecentReposList returns a new repo list with a new entry but only when it doesn't exist yet
func newRecentReposList(recentRepos []string, currentRepo string) (bool, []string) {
	isNew := true
	newRepos := []string{currentRepo}
	for _, repo := range recentRepos {
		if repo != currentRepo {
			if _, err := os.Stat(filepath.Join(repo, ".git")); err != nil {
				continue
			}
			newRepos = append(newRepos, repo)
		} else {
			isNew = false
		}
	}
	return isNew, newRepos
}