#define WIN32_LEAN_AND_MEAN
#define NOUSER
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

#define DLL_EXPORT __declspec(dllexport)

typedef int (WINAPI *MessageBoxAPtr)(HWND hwnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType);
typedef int (WINAPI *MessageBoxWPtr)(HWND hwnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType);

DLL_EXPORT WINAPI int MessageBoxA(HWND hwnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType) {
    MessageBoxAPtr proc = (MessageBoxAPtr) GetProcAddress(GetModuleHandle("user32.dll"), "MessageBoxA");
    LPSTR buffer = malloc(strlen(lpText) + 1 + 26);
    strcpy(buffer, "MessageBoxA gruesst Sie!\n"),
    strcat(buffer, lpText);
    int result = proc(hwnd, buffer, lpCaption, uType);
    free(buffer);
    return result;
    return 0;
}

DLL_EXPORT WINAPI int MessageBoxW(HWND hwnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uType) {
    MessageBoxWPtr proc = (MessageBoxWPtr) GetProcAddress(GetModuleHandle("user32.dll"), "MessageBoxW");
    LPWSTR buffer = malloc(wcslen(lpText) + 1 + 26);
    wcscpy(buffer, L"MessageBoxW gruesst Sie!\n");
    wcscat(buffer, lpText);
    int result = proc(hwnd, buffer, lpCaption, uType);
    free(buffer);
    return result;
}

DLL_EXPORT WINAPI BOOL GetVersionExW(LPOSVERSIONINFOW version) {
    if (version->dwOSVersionInfoSize == sizeof(OSVERSIONINFOW)) {
        version->dwMajorVersion = 4;
        version->dwMinorVersion = 0;
        version->dwBuildNumber = 1381;
        version->dwPlatformId = VER_PLATFORM_WIN32_NT;
        //wcscpy(version->szCSDVersion, L"Befator Inc gruesst Sie!");

        /*HKEY key;
        if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("SOFTWARE\\BCompat"), 0, KEY_READ, &key) == ERROR_SUCCESS) {
            DWORD size;
            DWORD major = 0;
            if (RegQueryValueEx(key, TEXT("ReportedMajor"), NULL, NULL, (LPBYTE) &major, &size) == ERROR_SUCCESS) {
                version->dwMajorVersion = major;
            }
            DWORD minor = 0;
            if (RegQueryValueEx(key, TEXT("ReportedMinor"), NULL, NULL, (LPBYTE) &minor, &size) == ERROR_SUCCESS) {
                version->dwMinorVersion = minor;
            }
            DWORD build = 0;
            if (RegQueryValueEx(key, TEXT("ReportedBuild"), NULL, NULL, (LPBYTE) &build, &size) == ERROR_SUCCESS) {
                version->dwBuildNumber = build;
            }
            DWORD platform = 0;
            if (RegQueryValueEx(key, TEXT("ReportedPlatform"), NULL, NULL, (LPBYTE) &platform, &size) == ERROR_SUCCESS) {
                version->dwPlatformId = platform;
            }
            RegCloseKey(key);
        }*/
        return TRUE;
    } else {
        SetLastError(ERROR_INSUFFICIENT_BUFFER);
        return FALSE;
    }
}

DLL_EXPORT WINAPI BOOL GetVersionExA(LPOSVERSIONINFOA version) {
    if (version->dwOSVersionInfoSize == sizeof(OSVERSIONINFOA)) {
        OSVERSIONINFOW versionW;
        versionW.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
        if (GetVersionExW(&versionW)) {
            version->dwMajorVersion = versionW.dwMajorVersion;
            version->dwMinorVersion = versionW.dwMinorVersion;
            version->dwBuildNumber = versionW.dwBuildNumber;
            version->dwPlatformId = versionW.dwPlatformId;
            //wcstombs(version->szCSDVersion, versionW.szCSDVersion, ARRAYSIZE(version->szCSDVersion));
            return TRUE;
        }
        return FALSE;
    } else {
        SetLastError(ERROR_INSUFFICIENT_BUFFER);
        return FALSE;
    }
}