// Author: Enrico Guiraud, Danilo Piparo CERN  09/2018

/*************************************************************************
 * Copyright (C) 1995-2018, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_RDFNODEBASE
#define ROOT_RDFNODEBASE

#include "RtypesCore.h"

#include <memory>
#include <string>
#include <vector>

namespace ROOT {
namespace RDF {
class RCutFlowReport;
}

namespace Internal {
namespace RDF {
namespace GraphDrawing {
class GraphNode;
}
}
}

namespace Detail {
namespace RDF {

class RLoopManager;

/// Base class for non-leaf nodes of the computational graph.
/// It only exposes the bare minimum interface required to work as a generic part of the computation graph.
/// RDataFrames and results of transformations can be cast to this type via ROOT::RDF::ToCommonNodeType.
class RNodeBase {
protected:
   RLoopManager *fLoopManager;
   unsigned int fNChildren{0};      ///< Number of nodes of the functional graph hanging from this object
   unsigned int fNStopsReceived{0}; ///< Number of times that a children node signaled to stop processing entries.

public:
   RNodeBase(RLoopManager *lm = nullptr) : fLoopManager(lm) {}
   virtual ~RNodeBase() {}
   virtual bool CheckFilters(unsigned int, Long64_t) = 0;
   virtual void Report(ROOT::RDF::RCutFlowReport &) const = 0;
   virtual void PartialReport(ROOT::RDF::RCutFlowReport &) const = 0;
   virtual void IncrChildrenCount() = 0;
   virtual void StopProcessing() = 0;
   virtual void AddFilterName(std::vector<std::string> &filters) = 0;
   virtual std::shared_ptr<ROOT::Internal::RDF::GraphDrawing::GraphNode> GetGraph() = 0;

   virtual void ResetChildrenCount()
   {
      fNChildren = 0;
      fNStopsReceived = 0;
   }

   virtual RLoopManager *GetLoopManagerUnchecked() { return fLoopManager; }
};
} // ns RDF
} // ns Detail
} // ns ROOT

#endif