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//
// G4BuffercoutDestination
//
// Class Description:
//
// A cout destination that buffers received stream in a buffer and
// dumps the buffer only when full.
// Optionally allows for an infinite buffer.

//      ---------------- G4BuffercoutDestination ----------------
//
// Author: A.Dotti (SLAC), 14 April 2017
// --------------------------------------------------------------------
#ifndef G4BUFFERCOUTDESTINATION_HH
#define G4BUFFERCOUTDESTINATION_HH

#include <memory>
#include <sstream>

#include "G4coutDestination.hh"

class G4BuffercoutDestination : public G4coutDestination
{
 public:
  explicit G4BuffercoutDestination(std::size_t maxSize = 0);
  ~G4BuffercoutDestination() override;

  G4int ReceiveG4debug(const G4String& msg) override;
  G4int ReceiveG4cout(const G4String& msg) override;
  G4int ReceiveG4cerr(const G4String& msg) override;

  // Flush buffer to std output
  virtual G4int FlushG4debug();
   // Flush buffer to std output
  virtual G4int FlushG4cout();
  // Flush buffer to std error
  virtual G4int FlushG4cerr();
  
  // Flush all buffers
  virtual void Finalize();

  // Set maximum size of buffer, when buffer grows to specified size,
  // it will trigger flush. Dimension in char
  void SetMaxSize(std::size_t max);
  std::size_t GetMaxSize() const { return m_maxSize; }

 protected:
  std::size_t m_maxSize = 0;

  class BufferImpl;
  std::unique_ptr<BufferImpl> m_buffer_dbg;
  std::unique_ptr<BufferImpl> m_buffer_out;
  std::unique_ptr<BufferImpl> m_buffer_err;
};

#endif