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// G4QSSMessenger
//
// Messenger for QSS Integrator driver

// Author: Leandro Gomez Vidal (Univ. Buenos Aires), October 2021
// --------------------------------------------------------------------
#ifndef G4QSSMessenger_HH
#define G4QSSMessenger_HH

#include "G4UIcmdWithABool.hh"
#include "G4UIcmdWithADouble.hh"
#include "G4UIcmdWithADoubleAndUnit.hh"
#include "G4UIcmdWithAString.hh"
#include "G4UIcmdWithAnInteger.hh"
#include "G4UIcmdWithoutParameter.hh"
#include "G4UIdirectory.hh"
#include "G4UImessenger.hh"

#include "G4QSSParameters.hh"

class G4QSSMessenger : public G4UImessenger
{
  public:

    /**
     * Constructor and Destructor.
     */
    G4QSSMessenger();
    ~G4QSSMessenger() override;

    /**
     * Applies command to the associated object.
     */
    void SetNewValue(G4UIcommand* command, G4String newValues) override;

    /* Hacky - much easier to access G4QSSMessenger from G4QSSDriver than the other way around
     * Multithreading seems to cause weird stuff with Driver/Stepper instances, maybe making
     * some thread-local copies or something, outside of construction? */

    static G4QSSMessenger* instance();

    /**
     * Accessors.
     */
    inline G4int GetQssOrder() { return G4QSSParameters::Instance()->GetQssOrder(); }
    inline G4double Get_dQRel() { return G4QSSParameters::Instance()->Get_dQRel(); }
    inline G4double Get_dQMin() { return G4QSSParameters::Instance()->Get_dQMin(); }
    inline G4int GetMaxSubsteps() { return G4QSSParameters::Instance()->GetMaxSubsteps(); }   

    enum StepperSelection
    {
      None = 1,
      G4QSS2 = 2,
      G4QSS3 = 3,
      NumMethods,
    };

    /**
     * Stepper selection, G4QSS2 or G4QSS3.
     */
    void selectStepper(const std::string&);
    StepperSelection selectedStepper();

    /**
     * Sets QSS order. To be suppressed in favour of the method
     * it calls in G4QSSParameters.
     */
    G4bool SetQssOrder(G4int order);
   
  private:

    /**
     * Internal methods -- could be suppressed in future.
     */
    G4bool Set_dQMin( G4double dvalue );
    G4bool Set_dQRel( G4double value );
    G4bool SetMaxSubsteps( G4int number );
   
  private:

    StepperSelection _selectedStepper= StepperSelection::None;

    G4UIdirectory*             qssCmdDir;
    G4UIcmdWithADoubleAndUnit* dQMinCmd;
    G4UIcmdWithADouble*        dQRelCmd;
    G4UIcmdWithAString*        stepperSelectorCmd;
    G4UIcmdWithAnInteger*      maxSubstepsCmd;
};

#endif