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package tui

import (
	"fmt"
	"os"
	"sort"
	"strings"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/huh"
	"github.com/charmbracelet/ssh"
	"go.jolheiser.com/ugit/internal/git"
)

type tui struct {
	s       ssh.Session
	repoDir string
	note    *string
	repo    *git.Repo
	nextCmd func() error
}

func New(s ssh.Session, repoDir string) error {
	t := tui{
		s:       s,
		repoDir: repoDir,
	}
	t.nextCmd = t.repoList
	return t.run()
}

func (t *tui) run() error {
	for {
		if t.nextCmd == nil {
			break
		}
		if err := t.nextCmd(); err != nil {
			return err
		}
	}
	return nil
}

func (t *tui) repoList() error {
	repoPaths, err := os.ReadDir(t.repoDir)
	if err != nil {
		return err
	}

	repos := make([]*git.Repo, 0, len(repoPaths))
	for _, repoName := range repoPaths {
		if !strings.HasSuffix(repoName.Name(), ".git") {
			continue
		}
		repo, err := git.NewRepo(t.repoDir, repoName.Name())
		if err != nil {
			return err
		}
		repos = append(repos, repo)
	}
	sort.Slice(repos, func(i, j int) bool {
		return repos[i].Name() < repos[j].Name()
	})

	opts := make([]huh.Option[*git.Repo], 0, len(repos))
	for _, repo := range repos {
		opts = append(opts, huh.NewOption(repo.Name(), repo))
	}

	if err := t.form(huh.NewSelect[*git.Repo]().
		Title("Repo Selection").
		Options(opts...).
		Value(&t.repo),
	).Run(); err != nil {
		return err
	}

	t.nextCmd = t.repoMenu
	return nil
}

func (t *tui) repoMenu() error {
	var sel string
	if err := t.form(huh.NewSelect[string]().
		Title(t.repo.Name()).
		Options(
			huh.NewOption("edit", "edit"),
			huh.NewOption("delete", "delete"),
			huh.NewOption("back", "back"),
		).
		Value(&sel),
	).Run(); err != nil {
		return err
	}

	switch sel {
	case "edit":
		t.nextCmd = t.repoEdit
	case "delete":
		t.nextCmd = t.repoDelete
	case "back":
		t.nextCmd = t.repoList
	default:
		t.nextCmd = nil
	}
	return nil
}

func (t *tui) repoEdit() error {
	form := git.RepoMeta{
		Description: t.repo.Meta.Description,
		Private:     t.repo.Meta.Private,
	}
	if err := t.form(
		huh.NewText().
			Title("Description").
			Value(&form.Description),
		huh.NewConfirm().
			Title("Visibility").
			Affirmative("Private").
			Negative("Public").
			Value(&form.Private),
	).Run(); err != nil {
		return err
	}

	t.repo.Meta = form
	if err := t.repo.SaveMeta(); err != nil {
		return err
	}

	t.note = note(fmt.Sprintf("%q edited", t.repo.Name()))
	t.nextCmd = t.repoList
	return nil
}

func (t *tui) repoDelete() error {
	var del bool
	if err := t.form(huh.NewConfirm().
		Title(fmt.Sprintf("Are you sure you want to delete %q?", t.repo.Name())).
		Value(&del),
	).Run(); err != nil {
		return err
	}

	if del {
		if err := os.RemoveAll(t.repo.Path()); err != nil {
			return err
		}
		t.note = note(fmt.Sprintf("%q deleted", t.repo.Name()))
	}
	t.nextCmd = t.repoList
	return nil
}

func (t *tui) form(fields ...huh.Field) *huh.Form {
	if t.note != nil {
		fields = append([]huh.Field{huh.NewNote().Title(*t.note)}, fields...)
		t.note = nil
	}
	return huh.NewForm(
		huh.NewGroup(fields...),
	).WithProgramOptions(tea.WithAltScreen()).WithInput(t.s).WithOutput(t.s).WithTheme(huh.ThemeCatppuccin())
}

func note(msg string) *string {
	return &msg
}