/**********************************************************************

  Audacity: A Digital Audio Editor

  Profiler.h

  Created by Michael Chinen (mchinen) on 8/12/08
  Audacity(R) is copyright (c) 1999-2008 Audacity Team.
  License: GPL v2.  See License.txt.

******************************************************************//**

\class Profiler
\brief A simple profiler to measure the average time lengths that a
particular task/function takes.  Currently not thread-safe and not thread-smart,
but it will probably work fine if you use it on a high level.

\class TaskProfile
\brief a simple class to keep track of one task that may be called multiple times.

*//*******************************************************************/





#ifndef __AUDACITY_PROFILER__
#define __AUDACITY_PROFILER__
#include <mutex>
#include <vector>
#include <time.h>
#include "MemoryX.h"


#define BEGIN_TASK_PROFILING(TASK_DESCRIPTION) Profiler::Instance()->Begin(__FILE__,__LINE__,TASK_DESCRIPTION)
#define END_TASK_PROFILING(TASK_DESCRIPTION) Profiler::Instance()->End(__FILE__,__LINE__,TASK_DESCRIPTION)

class TaskProfile;
class Profiler
{
 public:

   ///write to a profile at the end of the test.
   virtual ~Profiler();

   ///start the task timer.
   void Begin(const char* fileName, int lineNum, const char* taskDescription);
   ///end the task timer.
   void End(const char* fileName, int lineNum, const char* taskDescription);

   ///Gets the singleton instance
   static Profiler* Instance();

  protected:
   ///private constructor - Singleton.
   Profiler(){};

   ///find a taskProfile for the given task, otherwise create
   TaskProfile* GetOrCreateTaskProfile(const char* fileName, int lineNum);
   TaskProfile* GetTaskProfileByDescription(const char* description);

   //List of current Task to do.
   std::vector<std::unique_ptr<TaskProfile>> mTasks;
   //mutex for above variable
   std::mutex mTasksMutex;

};

 class TaskProfile
   {
   public:
      TaskProfile();
      virtual ~TaskProfile();

      ///start the task timer.
      void Begin(const char* fileName, int lineNum, const char* taskDescription);
      ///end the task timer.
      void End(const char* fileName, int lineNum, const char* taskDescription);

      double ComputeAverageRunTime();

      ArrayOf<char> mFileName;
      int mLine;
      ArrayOf<char> mDescription;
      int mNumHits;
      clock_t mCumTime;
      clock_t mLastTime;
   };


#endif