/*!
    \file environment.cpp
    \brief Environment management implementation
    \author Ivan Shynkarenka
    \date 27.07.2016
    \copyright MIT License
*/

#include "include/environment.h"
#include "include/resource.h"

#include <codecvt>
#include <sstream>

#if defined(__APPLE__)
#include <sys/sysctl.h>
extern char **environ;
#elif defined(unix) || defined(__unix) || defined(__unix__)
#include <cstring>
#include <fstream>
#include <regex>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/utsname.h>
extern char **environ;
#endif
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
#include <windows.h>
#include <winternl.h>
#define STATUS_SUCCESS 0x00000000
#include <locale>
#endif

namespace CppCommon {

std::string Environment::OSVersion() {
#if defined(__APPLE__)
    char result[1024];
    size_t size = sizeof(result);
    if (sysctlbyname("kern.osrelease", result, &size, nullptr, 0) == 0)
        return result;

    return "<apple>";
#elif defined(__CYGWIN__)
    struct utsname name;
    if (uname(&name) == 0) {
        std::string result(name.sysname);
        result.append(" ");
        result.append(name.release);
        result.append(" ");
        result.append(name.version);
        return result;
    }

    return "<cygwin>";
#elif defined(linux) || defined(__linux) || defined(__linux__)
    static std::regex pattern("DISTRIB_DESCRIPTION=\"(.*)\"");

    std::string line;
    std::ifstream stream("/etc/lsb-release");
    while (getline(stream, line)) {
        std::smatch matches;
        if (std::regex_match(line, matches, pattern))
            return matches[1];
    }

    return "<linux>";
#elif defined(_WIN32) || defined(_WIN64)
    static NTSTATUS(__stdcall * RtlGetVersion)(OUT PRTL_OSVERSIONINFOEXW lpVersionInformation) = (NTSTATUS(__stdcall *)(PRTL_OSVERSIONINFOEXW))GetProcAddress(GetModuleHandle("ntdll.dll"), "RtlGetVersion");
    static void(__stdcall * GetNativeSystemInfo)(OUT LPSYSTEM_INFO lpSystemInfo) = (void(__stdcall *)(LPSYSTEM_INFO))GetProcAddress(GetModuleHandle("kernel32.dll"), "GetNativeSystemInfo");
    static BOOL(__stdcall * GetProductInfo)(IN DWORD dwOSMajorVersion, IN DWORD dwOSMinorVersion, IN DWORD dwSpMajorVersion, IN DWORD dwSpMinorVersion, OUT PDWORD pdwReturnedProductType) = (BOOL(__stdcall *)(DWORD, DWORD, DWORD, DWORD, PDWORD))GetProcAddress(GetModuleHandle("kernel32.dll"), "GetProductInfo");

    OSVERSIONINFOEXW osvi;
    ZeroMemory(&osvi, sizeof(OSVERSIONINFOEXW));
    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);

    if (RtlGetVersion != nullptr) {
        NTSTATUS ntRtlGetVersionStatus = RtlGetVersion(&osvi);
        if (ntRtlGetVersionStatus != STATUS_SUCCESS)
            return "<windows>";
    } else {
#if defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable : 4996) // C4996: 'function': was declared deprecated
#endif
        BOOL bOsVersionInfoEx = GetVersionExW((OSVERSIONINFOW *)&osvi);
        if (bOsVersionInfoEx == 0)
            return "<windows>";
#if defined(_MSC_VER)
#pragma warning(pop)
#endif
    }

    SYSTEM_INFO si;
    ZeroMemory(&si, sizeof(SYSTEM_INFO));

    if (GetNativeSystemInfo != nullptr)
        GetNativeSystemInfo(&si);
    else
        GetSystemInfo(&si);

    if ((osvi.dwPlatformId != VER_PLATFORM_WIN32_NT) || (osvi.dwMajorVersion <= 4)) {
        return "<windows>";
    }

    std::stringstream os;

    // Windows version
    os << "Microsoft ";
    if (osvi.dwMajorVersion >= 6) {
        if (osvi.dwMajorVersion == 10) {
            if (osvi.dwMinorVersion == 0) {
                if (osvi.wProductType == VER_NT_WORKSTATION) {
                    if (osvi.dwBuildNumber >= 22000)
                        os << "Windows 11 ";
                    else
                        os << "Windows 10 ";
                } else {
                    if (osvi.dwBuildNumber >= 20348)
                        os << "Windows Server 2022 ";
                    else if (osvi.dwBuildNumber >= 17763)
                        os << "Windows Server 2019 ";
                    else
                        os << "Windows Server 2016 ";
                }
            }
        } else if (osvi.dwMajorVersion == 6) {
            if (osvi.dwMinorVersion == 3) {
                if (osvi.wProductType == VER_NT_WORKSTATION)
                    os << "Windows 8.1 ";
                else
                    os << "Windows Server 2012 R2 ";
            } else if (osvi.dwMinorVersion == 2) {
                if (osvi.wProductType == VER_NT_WORKSTATION)
                    os << "Windows 8 ";
                else
                    os << "Windows Server 2012 ";
            } else if (osvi.dwMinorVersion == 1) {
                if (osvi.wProductType == VER_NT_WORKSTATION)
                    os << "Windows 7 ";
                else
                    os << "Windows Server 2008 R2 ";
            } else if (osvi.dwMinorVersion == 0) {
                if (osvi.wProductType == VER_NT_WORKSTATION)
                    os << "Windows Vista ";
                else
                    os << "Windows Server 2008 ";
            }
        }

        DWORD dwType;
        if ((GetProductInfo != nullptr) && GetProductInfo(osvi.dwMajorVersion, osvi.dwMinorVersion, 0, 0, &dwType)) {
            switch (dwType) {
            case PRODUCT_ULTIMATE:
                os << "Ultimate Edition";
                break;
            case PRODUCT_PROFESSIONAL:
                os << "Professional";
                break;
            case PRODUCT_HOME_PREMIUM:
                os << "Home Premium Edition";
                break;
            case PRODUCT_HOME_BASIC:
                os << "Home Basic Edition";
                break;
            case PRODUCT_ENTERPRISE:
                os << "Enterprise Edition";
                break;
            case PRODUCT_BUSINESS:
                os << "Business Edition";
                break;
            case PRODUCT_STARTER:
                os << "Starter Edition";
                break;
            case PRODUCT_CLUSTER_SERVER:
                os << "Cluster Server Edition";
                break;
            case PRODUCT_DATACENTER_SERVER:
                os << "Datacenter Edition";
                break;
            case PRODUCT_DATACENTER_SERVER_CORE:
                os << "Datacenter Edition (core installation)";
                break;
            case PRODUCT_ENTERPRISE_SERVER:
                os << "Enterprise Edition";
                break;
            case PRODUCT_ENTERPRISE_SERVER_CORE:
                os << "Enterprise Edition (core installation)";
                break;
            case PRODUCT_ENTERPRISE_SERVER_IA64:
                os << "Enterprise Edition for Itanium-based Systems";
                break;
            case PRODUCT_SMALLBUSINESS_SERVER:
                os << "Small Business Server";
                break;
            case PRODUCT_SMALLBUSINESS_SERVER_PREMIUM:
                os << "Small Business Server Premium Edition";
                break;
            case PRODUCT_STANDARD_SERVER:
                os << "Standard Edition";
                break;
            case PRODUCT_STANDARD_SERVER_CORE:
                os << "Standard Edition (core installation)";
                break;
            case PRODUCT_WEB_SERVER:
                os << "Web Server Edition";
                break;
            }
        }
    } else if ((osvi.dwMajorVersion == 5) && (osvi.dwMinorVersion == 2)) {
        if (GetSystemMetrics(SM_SERVERR2))
            os << "Windows Server 2003 R2, ";
        else if (osvi.wSuiteMask & VER_SUITE_STORAGE_SERVER)
            os << "Windows Storage Server 2003";
        else if (osvi.wSuiteMask & VER_SUITE_WH_SERVER)
            os << "Windows Home Server";
        else if ((osvi.wProductType == VER_NT_WORKSTATION) && (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64))
            os << "Windows XP Professional x64 Edition";
        else
            os << "Windows Server 2003, ";
        if (osvi.wProductType != VER_NT_WORKSTATION) {
            if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64) {
                if (osvi.wSuiteMask & VER_SUITE_DATACENTER)
                    os << "Datacenter Edition for Itanium-based Systems";
                else if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
                    os << "Enterprise Edition for Itanium-based Systems";
            } else if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
                if (osvi.wSuiteMask & VER_SUITE_DATACENTER)
                    os << "Datacenter x64 Edition";
                else if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
                    os << "Enterprise x64 Edition";
                else
                    os << "Standard x64 Edition";
            } else {
                if (osvi.wSuiteMask & VER_SUITE_COMPUTE_SERVER)
                    os << "Compute Cluster Edition";
                else if (osvi.wSuiteMask & VER_SUITE_DATACENTER)
                    os << "Datacenter Edition";
                else if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
                    os << "Enterprise Edition";
                else if (osvi.wSuiteMask & VER_SUITE_BLADE)
                    os << "Web Edition";
                else
                    os << "Standard Edition";
            }
        }
    } else if ((osvi.dwMajorVersion == 5) && (osvi.dwMinorVersion == 1)) {
        os << "Windows XP ";
        if (osvi.wSuiteMask & VER_SUITE_PERSONAL)
            os << "Home Edition";
        else
            os << "Professional";
    } else if ((osvi.dwMajorVersion == 5) && (osvi.dwMinorVersion == 0)) {
        os << "Windows 2000 ";
        if (osvi.wProductType == VER_NT_WORKSTATION)
            os << "Professional";
        else {
            if (osvi.wSuiteMask & VER_SUITE_DATACENTER)
                os << "Datacenter Server";
            else if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
                os << "Advanced Server";
            else
                os << "Server";
        }
    }

    // Windows Service Pack version
    std::wstring sp_version(osvi.szCSDVersion);
    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> convert;
    if (std::wcslen(osvi.szCSDVersion) > 0)
        os << " " << convert.to_bytes(sp_version.data(), sp_version.data() + sp_version.size());

    // Windows build
    os << " (build " << osvi.dwBuildNumber << ")";

    return os.str();
#else
#error Unsupported platform
#endif
}

} // namespace CppCommon