using System;
using System.Runtime.InteropServices;

namespace LightlessSync.Utils;

internal static class MemoryProcessProbe
{
    [DllImport("kernel32.dll")]
    private static extern nint GetCurrentProcess();

    [DllImport("kernel32.dll", SetLastError = true)]
    private static extern bool ReadProcessMemory(
        nint hProcess,
        nint lpBaseAddress,
        byte[] lpBuffer,
        int dwSize,
        out nint lpNumberOfBytesRead);

    private static readonly nint _proc = GetCurrentProcess();

    public static bool TryReadIntPtr(nint address, out nint value)
    {
        value = nint.Zero;

        if (address == nint.Zero)
            return false;

        if ((ulong)address < 0x10000UL)
            return false;

        var buf = new byte[IntPtr.Size];
        if (!ReadProcessMemory(_proc, address, buf, buf.Length, out var read) || read != (nint)buf.Length)
            return false;

        value = IntPtr.Size == 8
            ? (nint)BitConverter.ToInt64(buf, 0)
            : (nint)BitConverter.ToInt32(buf, 0);

        return true;
    }
}