// +build windows

// +build go1.4

package mousetrap

import (

	"os"

	"syscall"

	"unsafe"

)

func getProcessEntry(pid int) (*syscall.ProcessEntry32, error) {

	snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)

	if err != nil {

		return nil, err

	}

	defer syscall.CloseHandle(snapshot)

	var procEntry syscall.ProcessEntry32

	procEntry.Size = uint32(unsafe.Sizeof(procEntry))

	if err = syscall.Process32First(snapshot, &procEntry); err != nil {

		return nil, err

	}

	for {

		if procEntry.ProcessID == uint32(pid) {

			return &procEntry, nil

		}

		err = syscall.Process32Next(snapshot, &procEntry)

		if err != nil {

			return nil, err

		}

	}

}

// StartedByExplorer returns true if the program was invoked by the user double-clicking

// on the executable from explorer.exe

//

// It is conservative and returns false if any of the internal calls fail.

// It does not guarantee that the program was run from a terminal. It only can tell you

// whether it was launched from explorer.exe

func StartedByExplorer() bool {

	pe, err := getProcessEntry(os.Getppid())

	if err != nil {

		return false

	}

	return "explorer.exe" == syscall.UTF16ToString(pe.ExeFile[:])

}