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//
// G4UImessenger
//
// Class description:
//
// This class is the base class representing a messenger which keeps all basic
// commands. The user who wants to define some commands must create his/her
// own concrete class derived from this class. The user's concrete messenger
// must have a responsibility of creating and deleting commands. Also, it must
// take care of the delivering of the commands to the destination class and
// provide the current value(s) of the parameter(s)

// Author: Makoto Asai, 1998
// --------------------------------------------------------------------
#ifndef G4UImessenger_hh
#define G4UImessenger_hh 1

#include "G4UIdirectory.hh"
#include "G4ios.hh"
#include "globals.hh"

class G4UImessenger
{
  public:
    // Constructor. In the implementation of the concrete messenger,
    // all commands related to the messenger must be constructed
    G4UImessenger() = default;
    G4UImessenger(const G4String& path, const G4String& dsc, G4bool commandsToBeBroadcasted = true);

    // Destructor. In the implementation of the concrete messenger,
    // all commands defined in the constructor must be deleted
    virtual ~G4UImessenger();

    // The concrete implementation of this method gets the current value(s)
    // of the parameter(s) of the given command from the destination class,
    // converts the value(s) to a string, and returns the string.
    // Conversion could be done by the ConvertToString() method of
    // corresponding G4UIcmdXXX classes if the command is an object of
    // these G4UIcmdXXX classes
    virtual G4String GetCurrentValue(G4UIcommand* command);

    // The concrete implementation of this method converts the string
    // "newValue" to value(s) of type(s) of the parameter(s).
    // Converted methods corresponding to the type of the command can be
    // used if the command is an object of G4UIcmdXXX classes
    virtual void SetNewValue(G4UIcommand* command, G4String newValue);

    inline G4bool CommandsShouldBeInMaster() const { return commandsShouldBeInMaster; }

  protected:
    G4String ItoS(G4int i);
    G4String LtoS(G4long l);
    G4String DtoS(G4double a);
    G4String BtoS(G4bool b);
    G4int StoI(const G4String& s);
    G4long StoL(const G4String& s);
    G4double StoD(const G4String& s);
    G4bool StoB(const G4String& s);

    void AddUIcommand(G4UIcommand* newCommand);

    // Shortcut way for creating directory and commands
    void CreateDirectory(const G4String& path, const G4String& dsc,
                         G4bool commandsToBeBroadcasted = true);
    template<typename T>
    T* CreateCommand(const G4String& cname, const G4String& dsc);

  protected:
    G4UIdirectory* baseDir = nullptr;  // used if new object is created
    G4String baseDirName = "";  // used if dir already exists
    G4bool commandsShouldBeInMaster = false;
};

// Inline template implementations

template<typename T>
T* G4UImessenger::CreateCommand(const G4String& cname, const G4String& dsc)
{
  G4String path;
  if (cname[0] != '/') {
    path = baseDirName + cname;
    if (path[0] != '/') {
      path = "/" + path;
    }
  }

  T* command = new T(path.c_str(), this);
  command->SetGuidance(dsc.c_str());

  return command;
}

#endif