// SiYuan - Build Your Eternal Digital Garden
// Copyright (c) 2020-present, b3log.org
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package model

import (
	"os"
	"os/signal"
	"strconv"
	"strings"
	"syscall"
	"time"

	goPS "github.com/mitchellh/go-ps"
	"github.com/siyuan-note/logging"
	"github.com/siyuan-note/siyuan/kernel/util"
)

func HandleSignal() {
	c := make(chan os.Signal)
	signal.Notify(c, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM)
	s := <-c
	logging.LogInfof("received os signal [%s], exit kernel process now", s)
	Close(false, 1)
}

func HookDesktopUIProc() {
	if util.ContainerStd != util.Container || "dev" == util.Mode {
		return
	}

	time.Sleep(30 * time.Second)
	existUIProc := false
	for range time.Tick(7 * time.Second) {
		util.UIProcessIDs.Range(func(uiProcIDArg, _ interface{}) bool {
			uiProcID, err := strconv.Atoi(uiProcIDArg.(string))
			if nil != err {
				logging.LogErrorf("invalid UI proc ID [%s]: %s", uiProcIDArg, err)
				return true
			}

			proc, err := goPS.FindProcess(uiProcID)
			if nil != err {
				logging.LogErrorf("find UI proc [%d] failed: %s", uiProcID, err)
				return true
			}

			if strings.Contains(strings.ToLower(proc.Executable()), "siyuan") {
				existUIProc = true
				return false
			}

			return true
		})

		if !existUIProc {
			logging.LogInfof("no active UI proc, exit kernel process now")
			Close(false, 1)
		}
	}
}