package main

import (
	"brainbaking.com/restictray/restic"
	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	"os"
	"time"

	"fyne.io/systray"
	"fyne.io/systray/example/icon"
)

// I'm ignoring go threading issues here; assume no clicks happen at the same time.
var wrapper *restic.Wrapper

func main() {
	// init and setup logging
	log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
	wrapper = &restic.Wrapper{}

	// bootstrap systray (this is a blocking call, second func is onExit)
	systray.Run(onSystrayReady, func() {})
}

func addMenuLatestSnapshot() {
	snapshot := wrapper.LastSnapshot()
	systray.AddMenuItem("Latest: "+snapshot.Id+" @ "+snapshot.ShortTime(), "Latest Restic snapshot")
}

func addMenuNextTime(cnf *restic.Config) {
	nextTime := wrapper.LastSnapshot().Time.Add(time.Duration(cnf.BackupTimeInHours) * time.Hour)
	msg := "Next @ " + nextTime.Format(restic.ShortTimeFormat)
	if time.Now().After(nextTime) {
		msg = "⚠️ Overdue - " + msg
	}

	systray.AddMenuItem(msg, "Future Restic snapshot")
}

func addMenuQuit() {
	systray.AddSeparator()
	addMenuWithQuitAction("Quit", "Quit Restictray")
}

func addMenuError(err error) {
	addMenuWithQuitAction("❗ "+err.Error(), "Restictray Error")
}

func handleError(err error) {
	log.Err(err).Msg("")
	systray.ResetMenu()
	addMenuError(err)
	addMenuQuit()
}

func addMenuWithQuitAction(title string, tooltip string) {
	mQuit := systray.AddMenuItem(title, tooltip)
	go func() {
		<-mQuit.ClickedCh
		log.Info().Msg("Requesting quit")
		systray.Quit()
	}()
}

func onSystrayReady() {
	systray.SetTemplateIcon(icon.Data, icon.Data)
	systray.SetTooltip("Restictray")
	systray.AddMenuItem("... Initializing", "Initializing, please wait.")
	addMenuQuit()

	cnf, err := restic.ReadConfig()
	if err != nil {
		handleError(err)
		return
	}

	go func() {
		err := wrapper.UpdateLatestSnapshots(cnf)
		if err != nil {
			handleError(err)
			return
		}

		resetAndBuildMainMenu(cnf)
	}()
}

// See https://github.com/fyne-io/systray/tree/master/example for more examples
func resetAndBuildMainMenu(cnf *restic.Config) {
	systray.ResetMenu()
	addMenuLatestSnapshot()
	addMenuNextTime(cnf)
	systray.AddSeparator()
	mnuBackupNow := systray.AddMenuItem("Backup now", "Backup now")
	mnuBrowse := systray.AddMenuItem("Browse backups in Finder...", "Mount and browse backups")
	addMenuQuit()

	for {
		select {
		case <-mnuBackupNow.ClickedCh:
			onClickedMenuBackupNow(mnuBackupNow, cnf)
		case <-mnuBrowse.ClickedCh:
			onClickedMenuBrowse(mnuBrowse, cnf)
		}
	}
}

func onClickedMenuBrowse(browse *systray.MenuItem, cnf *restic.Config) {
	err := wrapper.MountBackups(cnf)
	if err != nil {
		handleError(err)
	}
}

func onClickedMenuBackupNow(mnu *systray.MenuItem, cnf *restic.Config) {
	mnu.SetTitle("🔄 Backup in progress...")
	mnu.Disable()
	// TODO after a backup, reinitialize latest snapshot + latest/next menus
	// TODO not by calling resetAndBuild again: this is from the for{}?
	// TODO how does this interop with a future goroutine that auto-backups?
	// TODO need for separate "backupInProgress" bool?
	err := wrapper.Backup(cnf)
	mnu.SetTitle("Backup now")
	mnu.Enable()

	if err != nil {
		handleError(err)
	}
}