// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package windows_test

import (
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"
	"syscall"
	"testing"

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

func TestWin32finddata(t *testing.T) {
	dir, err := ioutil.TempDir("", "go-build")
	if err != nil {
		t.Fatalf("failed to create temp directory: %v", err)
	}
	defer os.RemoveAll(dir)

	path := filepath.Join(dir, "long_name.and_extension")
	f, err := os.Create(path)
	if err != nil {
		t.Fatalf("failed to create %v: %v", path, err)
	}
	f.Close()

	type X struct {
		fd  windows.Win32finddata
		got byte
		pad [10]byte // to protect ourselves

	}
	var want byte = 2 // it is unlikely to have this character in the filename
	x := X{got: want}

	pathp, _ := windows.UTF16PtrFromString(path)
	h, err := windows.FindFirstFile(pathp, &(x.fd))
	if err != nil {
		t.Fatalf("FindFirstFile failed: %v", err)
	}
	err = windows.FindClose(h)
	if err != nil {
		t.Fatalf("FindClose failed: %v", err)
	}

	if x.got != want {
		t.Fatalf("memory corruption: want=%d got=%d", want, x.got)
	}
}

func TestFormatMessage(t *testing.T) {
	dll := windows.MustLoadDLL("netevent.dll")

	const TITLE_SC_MESSAGE_BOX uint32 = 0xC0001B75
	const flags uint32 = syscall.FORMAT_MESSAGE_FROM_HMODULE | syscall.FORMAT_MESSAGE_ARGUMENT_ARRAY | syscall.FORMAT_MESSAGE_IGNORE_INSERTS
	buf := make([]uint16, 300)
	_, err := windows.FormatMessage(flags, uintptr(dll.Handle), TITLE_SC_MESSAGE_BOX, 0, buf, nil)
	if err != nil {
		t.Fatalf("FormatMessage for handle=%x and errno=%x failed: %v", dll.Handle, TITLE_SC_MESSAGE_BOX, err)
	}
}

func abort(funcname string, err error) {
	panic(funcname + " failed: " + err.Error())
}

func ExampleLoadLibrary() {
	h, err := windows.LoadLibrary("kernel32.dll")
	if err != nil {
		abort("LoadLibrary", err)
	}
	defer windows.FreeLibrary(h)
	proc, err := windows.GetProcAddress(h, "GetVersion")
	if err != nil {
		abort("GetProcAddress", err)
	}
	r, _, _ := syscall.Syscall(uintptr(proc), 0, 0, 0, 0)
	major := byte(r)
	minor := uint8(r >> 8)
	build := uint16(r >> 16)
	print("windows version ", major, ".", minor, " (Build ", build, ")\n")
}

func TestTOKEN_ALL_ACCESS(t *testing.T) {
	if windows.TOKEN_ALL_ACCESS != 0xF01FF {
		t.Errorf("TOKEN_ALL_ACCESS = %x, want 0xF01FF", windows.TOKEN_ALL_ACCESS)
	}
}

func TestCreateWellKnownSid(t *testing.T) {
	sid, err := windows.CreateWellKnownSid(windows.WinBuiltinAdministratorsSid)
	if err != nil {
		t.Fatalf("Unable to create well known sid for administrators: %v", err)
	}
	sidStr, err := sid.String()
	if err != nil {
		t.Fatalf("Unable to convert sid into string: %v", err)
	}
	if sidStr != "S-1-5-32-544" {
		t.Fatalf("Expecting administrators to be S-1-5-32-544, but found %s instead", sidStr)
	}
}

func TestPseudoTokens(t *testing.T) {
	version, err := windows.GetVersion()
	if err != nil {
		t.Fatal(err)
	}
	if ((version&0xffff)>>8)|((version&0xff)<<8) < 0x0602 {
		return
	}

	realProcessToken, err := windows.OpenCurrentProcessToken()
	if err != nil {
		t.Fatal(err)
	}
	defer realProcessToken.Close()
	realProcessUser, err := realProcessToken.GetTokenUser()
	if err != nil {
		t.Fatal(err)
	}

	pseudoProcessToken := windows.GetCurrentProcessToken()
	pseudoProcessUser, err := pseudoProcessToken.GetTokenUser()
	if err != nil {
		t.Fatal(err)
	}
	if !windows.EqualSid(realProcessUser.User.Sid, pseudoProcessUser.User.Sid) {
		t.Fatal("The real process token does not have the same as the pseudo process token")
	}

	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	err = windows.RevertToSelf()
	if err != nil {
		t.Fatal(err)
	}

	pseudoThreadToken := windows.GetCurrentThreadToken()
	_, err = pseudoThreadToken.GetTokenUser()
	if err != windows.ERROR_NO_TOKEN {
		t.Fatal("Expected an empty thread token")
	}
	pseudoThreadEffectiveToken := windows.GetCurrentThreadEffectiveToken()
	pseudoThreadEffectiveUser, err := pseudoThreadEffectiveToken.GetTokenUser()
	if err != nil {
		t.Fatal(nil)
	}
	if !windows.EqualSid(realProcessUser.User.Sid, pseudoThreadEffectiveUser.User.Sid) {
		t.Fatal("The real process token does not have the same as the pseudo thread effective token, even though we aren't impersonating")
	}

	err = windows.ImpersonateSelf(windows.SecurityImpersonation)
	if err != nil {
		t.Fatal(err)
	}
	defer windows.RevertToSelf()
	pseudoThreadUser, err := pseudoThreadToken.GetTokenUser()
	if err != nil {
		t.Fatal(err)
	}
	if !windows.EqualSid(realProcessUser.User.Sid, pseudoThreadUser.User.Sid) {
		t.Fatal("The real process token does not have the same as the pseudo thread token after impersonating self")
	}
}