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/*
 * Copyright 2021-2022 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.jna.platform.windows;

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.Structure.FieldOrder;
import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR;
import com.sun.jna.platform.win32.WinNT.HANDLE;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.W32APIOptions;

public interface NtDll extends com.sun.jna.platform.win32.NtDll {

    NtDll INSTANCE = Native.load("NtDll", NtDll.class, W32APIOptions.DEFAULT_OPTIONS);

    int PROCESS_BASIC_INFORMATION = 0;

    @FieldOrder({ "Reserved1", "PebBaseAddress", "Reserved2" })
    class PROCESS_BASIC_INFORMATION extends Structure {
        public Pointer Reserved1;
        public Pointer PebBaseAddress;
        public Pointer[] Reserved2 = new Pointer[4];
    }

    @FieldOrder({ "pad", "pad2", "ProcessParameters" })
    class PEB extends Structure {
        public byte[] pad = new byte[4];
        public Pointer[] pad2 = new Pointer[3];
        public Pointer ProcessParameters; // RTL_USER_PROCESS_PARAMETERS
    }

    @FieldOrder({ "MaximumLength", "Length", "Flags", "DebugFlags", "ConsoleHandle", "ConsoleFlags", "StandardInput",
            "StandardOutput", "StandardError", "CurrentDirectory", "DllPath", "ImagePathName", "CommandLine",
            "Environment", "StartingX", "StartingY", "CountX", "CountY", "CountCharsX", "CountCharsY", "FillAttribute",
            "WindowFlags", "ShowWindowFlags", "WindowTitle", "DesktopInfo", "ShellInfo", "RuntimeData",
            "CurrentDirectories", "EnvironmentSize", "EnvironmentVersion", "PackageDependencyData", "ProcessGroupId",
            "LoaderThreads", "RedirectionDllName", "HeapPartitionName", "DefaultThreadpoolCpuSetMasks",
            "DefaultThreadpoolCpuSetMaskCount" })
    class RTL_USER_PROCESS_PARAMETERS extends Structure {
        public int MaximumLength;
        public int Length;
        public int Flags;
        public int DebugFlags;
        public HANDLE ConsoleHandle;
        public int ConsoleFlags;
        public HANDLE StandardInput;
        public HANDLE StandardOutput;
        public HANDLE StandardError;
        public CURDIR CurrentDirectory;
        public UNICODE_STRING DllPath;
        public UNICODE_STRING ImagePathName;
        public UNICODE_STRING CommandLine;
        public Pointer Environment;
        public int StartingX;
        public int StartingY;
        public int CountX;
        public int CountY;
        public int CountCharsX;
        public int CountCharsY;
        public int FillAttribute;
        public int WindowFlags;
        public int ShowWindowFlags;
        public UNICODE_STRING WindowTitle;
        public UNICODE_STRING DesktopInfo;
        public UNICODE_STRING ShellInfo;
        public UNICODE_STRING RuntimeData;
        public RTL_DRIVE_LETTER_CURDIR[] CurrentDirectories = new RTL_DRIVE_LETTER_CURDIR[32];
        public ULONG_PTR EnvironmentSize;
        public ULONG_PTR EnvironmentVersion;
        public Pointer PackageDependencyData;
        public int ProcessGroupId;
        public int LoaderThreads;
        public UNICODE_STRING RedirectionDllName;
        public UNICODE_STRING HeapPartitionName;
        public ULONG_PTR DefaultThreadpoolCpuSetMasks;
        public int DefaultThreadpoolCpuSetMaskCount;
    }

    @FieldOrder({ "Length", "MaximumLength", "Buffer" })
    class UNICODE_STRING extends Structure {
        public short Length;
        public short MaximumLength;
        public Pointer Buffer;
    }

    @FieldOrder({ "Length", "MaximumLength", "Buffer" })
    class STRING extends Structure {
        public short Length;
        public short MaximumLength;
        public Pointer Buffer;
    }

    @FieldOrder({ "DosPath", "Handle" })
    class CURDIR extends Structure {
        public UNICODE_STRING DosPath;
        public Pointer Handle;
    }

    @FieldOrder({ "Flags", "Length", "TimeStamp", "DosPath" })
    class RTL_DRIVE_LETTER_CURDIR extends Structure {
        public short Flags;
        public short Length;
        public int TimeStamp;
        public STRING DosPath;
    }

    /*
     * Windows API docs say NtQueryInformationProcess may be altered or unavailable in future versions of Windows.
     * Applications should use the alternate functions listed in this topic. However, there is no other way to get this
     * information, it's been officially non-API for over a decade, and many many programs including windows sysinternal
     * tools rely on this behavior, so the odds of it going away are small.
     */
    int NtQueryInformationProcess(HANDLE ProcessHandle, int ProcessInformationClass, Pointer ProcessInformation,
            int ProcessInformationLength, IntByReference ReturnLength);
}