#pragma once
/**
  * @RDE_HEADER@
  * Thread management for generic FTCs
  * $Id: generic_ftc_impl.h 62388 2024-03-27 10:41:26Z wille_m $
  * $HeadURL: svn://slssvn/TDS/branches/product/features/swp_2023_devel/Lts/DDS/FTC/generic_ftc_impl.h $
  * $Author: wille_m $
  *
  * Created by Mike Wille, ESZS, 27-03-2024
  */

#include <QObject>
#include <QAtomicInt>
#include <QTimer>

#include <thread>
#include <exception>
#include <condition_variable>


class CancelationPointReached : public std::runtime_error
{
public:
  //using std::runtime_error::runtime_error;
  explicit CancelationPointReached()
    : std::runtime_error("CancelationPointReached")
  {}
};


class Threading // : public QObject
{
  //Q_OBJECT
public:
  Threading() = default;
  ~Threading();

protected:
  void preInit() const;

  // managing thread:
  void createThread(); // creates a thread if not already running - run before adding requests
  void runThread(); // notify thread

  // m_conditionMutex
  inline bool isRun() const { return (m_run != 0); }
  inline void setRun(bool run) { m_run = (run ? 1 : 0); }

  // m_conditionMutex
  inline void setWorkAvailable(bool workAvailable) { m_workAvailable = (workAvailable ? 1 : 0); }
  inline bool isWorkAvailable() const { return (m_workAvailable != 0); }

  // m_conditionMutex
  inline void setWorking(bool working) { m_isWorking = (working ? 1 : 0); }  
  inline bool isWorking() const { return (m_isWorking != 0); }

  const QString &threadName() const;
  inline const char *posixThreadName() const;

  virtual void work() = 0;
  virtual QString functionTopicName() const = 0;
  virtual int partitionId() const = 0;
  virtual QString partitionType() const = 0;
  virtual void cleanupThread() = 0; // in-thread!
  virtual void threadDone() = 0;

  inline void cancellationPoint() const noexcept(false) // in-thread
  {
    if (!isRun())
    {
     // fprintf(stderr, "Threading: cancelation point reached\n");
      throw CancelationPointReached();
    }
  }

  std::mutex m_conditionMutex;

private:
  inline bool isCleanupNeeded() const { return (m_cleanupNeeded != 0); }
  inline void setCleanupNeeded(bool cleanupNeeded) { m_cleanupNeeded = (cleanupNeeded ? 1 : 0); }
  void run(const QString &threadName); // in-thread

  //void stop();
  std::unique_ptr<QTimer> m_threadLifetime;
  QAtomicInt m_run { 0 };
  QAtomicInt m_cleanupNeeded { 1 };
  std::thread m_thread; // invalid / not a thread
  std::condition_variable m_condition;
  QAtomicInt m_workAvailable { 0 };
  QAtomicInt m_isWorking { 0 };
  mutable QString m_threadName;
  mutable std::string m_posixThreadName;
  QAtomicInt m_alreadyThreaded;
  mutable int m_partitionId { -1 };
  mutable QString m_partitionType;
  bool m_used { false };
  bool m_createThreadCalledBefore { false };
};