#include <QString>
#include <QDateTime>

namespace env
{

// represents one module
//
class Module
{
public:
  explicit Module(QString path, std::size_t fileSize);

  // returns the module's path
  //
  const QString& path() const;

  // returns the module's path in lowercase and using forward slashes
  //
  QString displayPath() const;

  // returns the size in bytes, may be 0
  //
  std::size_t fileSize() const;

  // returns the x.x.x.x version embedded from the version info, may be empty
  //
  const QString& version() const;

  // returns the FileVersion entry from the resource file, returns
  // "(no version)" if not available
  //
  const QString& versionString() const;

  // returns the build date from the version info, or the creation time of the
  // file on the filesystem, may be empty
  //
  const QDateTime& timestamp() const;

  // returns the md5 of the file, may be empty for system files
  //
  const QString& md5() const;

  // converts timestamp() to a string for display, returns "(no timestamp)" if
  // not available
  //
  QString timestampString() const;

  // returns a string with all the above information on one line
  //
  QString toString() const;

private:
  // contains the information from the version resource
  //
  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;

  // returns information from the version resource
  //
  FileInfo getFileInfo() const;

  // uses VS_FIXEDFILEINFO to build the version string
  //
  QString getVersion(const VS_FIXEDFILEINFO& fi) const;

  // uses the file date from VS_FIXEDFILEINFO if available, or gets the
  // creation date on the file
  //
  QDateTime getTimestamp(const VS_FIXEDFILEINFO& fi) const;

  // returns the md5 hash unless the path contains "\windows\"
  //
  QString getMD5() const;

  // gets VS_FIXEDFILEINFO from the file version info buffer
  //
  VS_FIXEDFILEINFO getFixedFileInfo(std::byte* buffer) const;

  // gets FileVersion from the file version info buffer
  //
  QString getFileDescription(std::byte* buffer) const;
};


std::vector<Module> getLoadedModules();

} // namespace env