package ui

import (
	"fmt"
	"log"
	"os/exec"
	"path/filepath"
	"sort"

	"github.com/go-git/go-git/v5"
	"github.com/gotk3/gotk3/glib"
	"varia.zone/hui/internal/bldr"
	"varia.zone/hui/internal/conf"
	"varia.zone/hui/internal/model"
)

// hugoNewSite creates a new Hugo site.
func hugoNewSite(m *model.Model, siteName string) error {
	newSiteDir := conf.NewSiteDir(m.User.HomeDir, siteName)
	hugoBinPath := conf.HugoBinPath(m.User.HomeDir)

	cmd := exec.Command(hugoBinPath, "new", "site", newSiteDir)
	if err := cmd.Run(); err != nil {
		return fmt.Errorf("unable to create new site: %s", err)
	}

	// TODO(d1): allow users to choose a default theme
	if _, err := git.PlainClone(filepath.Join(newSiteDir, "themes", "nostyleplease"), false, &git.CloneOptions{
		URL: "https://github.com/g-hanwen/hugo-theme-nostyleplease",
	}); err != nil {
		return fmt.Errorf("unable to clone 'nostyleplease' theme: %s", err)
	}

	return nil
}

// ShowNewSiteDialog shows the new site dialog.
func ShowNewSiteDialog(m *model.Model) error {
	dialog, err := bldr.GetDialog(m.Builder, conf.NewSiteDialog)
	if err != nil {
		return err
	}

	dialog.Show()

	return nil
}

// HideNewSiteDialog hides the new site dialog.
func HideNewSiteDialog(m *model.Model) error {
	dialog, err := bldr.GetDialog(m.Builder, conf.NewSiteDialog)
	if err != nil {
		return err
	}

	dialog.Hide()

	return nil
}

// CreateNewSite handles the creation of a new site.
func CreateNewSite(m *model.Model) error {
	if err := HideNewSiteDialog(m); err != nil {
		return fmt.Errorf("CreateNewSite: %s", err)
	}

	entry, err := bldr.GetEntry(m.Builder, conf.NewSiteNameEntry)
	if err != nil {
		return fmt.Errorf("CreateNewSite: %s", err)
	}

	siteName, err := entry.GetText()
	if err != nil {
		return fmt.Errorf("CreateNewSite: %s", err)
	}

	msg := fmt.Sprintf("Creating new site '%s'...", siteName)
	if err := SwitchStackPage(m, conf.BusyStackPage, msg); err != nil {
		return fmt.Errorf("CreateNewSite: %s", err)
	}

	go func() {
		if err := hugoNewSite(m, siteName); err != nil {
			glib.IdleAdd(func() bool {
				if err := ShowErrDialog(m, err); err != nil {
					log.Fatal(fmt.Errorf("CreateNewSite: unable to show error dialog: %s", err))
				}

				return false
			})
		}

		glib.IdleAdd(func() bool {
			m.CurrentSite = siteName

			if err := SetHeaderBarSubtitle(m, m.CurrentSite); err != nil {
				if err := ShowErrDialog(m, err); err != nil {
					log.Fatal(fmt.Errorf("CreateNewSite: unable to show error dialog: %s", err))
				}
			}

			m.SiteNames = append(m.SiteNames, siteName)
			sort.Strings(m.SiteNames)

			if err := PopulateOpenSiteMenu(m); err != nil {
				if err := ShowErrDialog(m, err); err != nil {
					log.Fatal(fmt.Errorf("CreateNewSite: unable to show error dialog: %s", err))
				}
			}

			if err := SwitchStackPage(m, conf.ContentStackPage); err != nil {
				if err := ShowErrDialog(m, err); err != nil {
					log.Fatal(fmt.Errorf("CreateNewSite: unable to show error dialog: %s", err))
				}
			}

			if err := ShowContentButtons(m); err != nil {
				if err := ShowErrDialog(m, err); err != nil {
					log.Fatal(fmt.Errorf("CreateNewSite: unable to show error dialog: %s", err))
				}
			}

			return false
		})
	}()

	return nil
}