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/*
Copyright (C) 2012 Sebastian Herbord. All rights reserved.

This file is part of Mod Organizer.

Mod Organizer is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Mod Organizer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef UTIL_H
#define UTIL_H


#include <string>
#include <optional>

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>

#include <versioninfo.h>

namespace MOShared {

/// Test if a file (or directory) by the specified name exists
bool FileExists(const std::string &filename);
bool FileExists(const std::wstring &filename);

bool FileExists(const std::wstring &searchPath, const std::wstring &filename);

std::string ToString(const std::wstring &source, bool utf8);
std::wstring ToWString(const std::string &source, bool utf8);

std::string &ToLower(std::string &text);
std::string ToLower(const std::string &text);

std::wstring &ToLower(std::wstring &text);
std::wstring ToLower(const std::wstring &text);

bool CaseInsensitiveEqual(const std::wstring &lhs, const std::wstring &rhs);


namespace env
{

class Module
{
public:
  explicit Module(QString path, std::size_t fileSize);

  const QString& path() const;
  QString displayPath() const;

  std::size_t fileSize() const;
  const QString& version() const;
  const QString& versionString() const;
  QString timestampString() const;

  QString toString() const;

private:
  struct FileInfo
  {
    VS_FIXEDFILEINFO ffi;
    QString fileDescription;
  };

  QString m_path;
  std::size_t m_fileSize;
  QString m_version;
  QDateTime m_timestamp;
  QString m_versionString;
  QString m_md5;

  FileInfo getFileInfo() const;

  QString getVersion(const VS_FIXEDFILEINFO& fi) const;
  QDateTime getTimestamp(const VS_FIXEDFILEINFO& fi) const;
  QString getMD5() const;

  VS_FIXEDFILEINFO getFixedFileInfo(std::byte* buffer) const;
  QString getFileDescription(std::byte* buffer) const;
};


class WindowsVersion
{
public:
  WindowsVersion();

  bool compatibilityMode() const;
  QString toString() const;

private:
  DWORD m_realMajor, m_realMinor, m_realBuild;
  DWORD m_major, m_minor, m_build;
  QString m_buildLab, m_productName, m_releaseID;
  DWORD m_UBR;
  std::optional<bool> m_elevated;

  void getVersion();
  void getRealVersion(HINSTANCE ntdll);
  void getReportedVersion(HINSTANCE ntdll);
  void getRelease();
  void getElevated();
};


class Environment
{
public:
  Environment();

  const std::vector<Module>& loadedModules();
  const WindowsVersion& windowsVersion() const;

private:
  std::vector<Module> m_modules;
  WindowsVersion m_windows;

  void getLoadedModules();
};

} // namespace env


MOBase::VersionInfo createVersionInfo();

} // namespace MOShared

#endif // UTIL_H