// SPDX-License-Identifier: BSD-3-Clause
//go:build (windows && amd64) || (windows && arm64)

package process

import (
	"syscall"
	"unsafe"

	"github.com/shirou/gopsutil/v4/internal/common"
	"golang.org/x/sys/windows"
)

type PROCESS_MEMORY_COUNTERS struct {
	CB                         uint32
	PageFaultCount             uint32
	PeakWorkingSetSize         uint64
	WorkingSetSize             uint64
	QuotaPeakPagedPoolUsage    uint64
	QuotaPagedPoolUsage        uint64
	QuotaPeakNonPagedPoolUsage uint64
	QuotaNonPagedPoolUsage     uint64
	PagefileUsage              uint64
	PeakPagefileUsage          uint64
}

func queryPebAddress(procHandle syscall.Handle, _ bool) (uintptr, error, bool) {
	var queryFrom64Bit bool = true

	// we are in a 64-bit process
	var info processBasicInformation64

	ret, _, _ := common.ProcNtQueryInformationProcess.Call(
		uintptr(procHandle),
		uintptr(common.ProcessBasicInformation),
		uintptr(unsafe.Pointer(&info)),
		uintptr(unsafe.Sizeof(info)),
		uintptr(0),
	)
	if status := windows.NTStatus(ret); status == windows.STATUS_SUCCESS {
		return info.PebBaseAddress, nil, queryFrom64Bit
	} else {
		return 0, windows.NTStatus(ret), queryFrom64Bit
	}
}

func readProcessMemory(procHandle syscall.Handle, _ bool, address uintptr, size uint) []byte {
	var read uint

	buffer := make([]byte, size)

	ret, _, _ := common.ProcNtReadVirtualMemory.Call(
		uintptr(procHandle),
		uintptr(address),
		uintptr(unsafe.Pointer(&buffer[0])),
		uintptr(size),
		uintptr(unsafe.Pointer(&read)),
	)
	if int(ret) >= 0 && read > 0 {
		return buffer[:read]
	}
	return nil
}