//go:build windows
// +build windows

package main

import (
	"os"
	"os/exec"
	"strconv"
	"syscall"

	"golang.org/x/sys/windows"
)

type mainProgramStarter struct{}

func (s *mainProgramStarter) GetMainName() string {
	return "main.exe"
}

func (s *mainProgramStarter) Start(targetExe string) error {
	cmd := exec.Command(targetExe)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	// Windows：新进程组，脱离 Ctrl+C / 父进程
	cmd.SysProcAttr = &syscall.SysProcAttr{
		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
	}

	return cmd.Start()
}

// 判断进程是否在运行
func (s *mainProgramStarter) IsProcessRunning(pid int) (bool, error) {
	if pid <= 0 {
		return false, nil
	}

	// 打开进程句柄
	handle, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, uint32(pid))
	if err != nil {
		// 权限不足，但进程存在
		if err == windows.ERROR_ACCESS_DENIED {
			return true, nil
		}
		// 进程不存在
		if err == windows.ERROR_INVALID_PARAMETER {
			return false, nil
		}
		// 其他错误
		return false, err
	}
	defer windows.CloseHandle(handle)

	return true, nil
}

// 杀掉进程
func (w *mainProgramStarter) KillProcess(pid int) error {
	cmd := exec.Command("taskkill", "/PID", strconv.Itoa(pid), "/F")
	return cmd.Run()
}