#pragma once

#ifndef TTIMER_INCLUDED
#define TTIMER_INCLUDED

#include <memory>

#include "tcommon.h"

#undef DVAPI
#undef DVVAR
#ifdef TAPPTOOLS_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

//-------------------------------------------------------------------

class DVAPI TGenericTimerAction {
public:
  virtual ~TGenericTimerAction() {}
  virtual void sendCommand(TUINT64 tick) = 0;
};

//-------------------------------------------------------------------

template <class T>
class TTimerAction final : public TGenericTimerAction {
public:
  typedef void (T::*Method)(TUINT64 tick);
  TTimerAction(T *target, Method method) : m_target(target), m_method(method) {}
  void sendCommand(TUINT64 tick) override { (m_target->*m_method)(tick); }

private:
  T *m_target;
  Method m_method;
};

//------------------------------------------------------------------------------
//! THis class is manages general time events.
/*!
                This class defines a timer,
                i.e a system which, at user defined time steps, sends events
   through a callback function.
        */
class DVAPI TTimer {
public:
  /*!
          Specifies which is the type of timer of this object.
  */
  enum Type {
    OneShot, /*!< This type of timer sends timer events only at a single time.
                */
    Periodic /*!< This type of timer sends timer events periodically. */
  };

  /*!
          Creates a timer with name \p name, resolution \p timerRes and type \p
     type.
          Resolution is expressed in milliseconds.
  */
  TTimer(const std::string &name, UINT timerRes, Type type);
  /*!
          Deletes the timer.
  */
  ~TTimer();

  /*!
          Starts the timer after \p delay milliseconds.
  */
  void start(UINT delay);  // delay expressed in milliseconds
                           /*!
Stops the timer immediately.
Doesn't delete the timer.
*/
  void stop();
  /*!
          Returns \p true if the timer is started.
  */
  bool isStarted() const;
  /*!
          Returns the name of the timer.
  */
  std::string getName() const;
  /*!
          Asks the timer for number of events so far.
  */
  TUINT64 getTicks() const;
  /*!
          Returns the initial start delay of the timer.
  */
  UINT getDelay() const;
  /*!
          Sets the callback function, i.e. the function to be called every
     timer's shot.
  */
  void setAction(TGenericTimerAction *action);

  class Imp;

private:
  std::unique_ptr<Imp> m_imp;

  TTimer(const TTimer &);
  void operator=(const TTimer &);
};

#endif