/**************************************************************************************/
/*                                                                                    */
/*  Visualization Library                                                             */
/*  http://visualizationlibrary.org                                                   */
/*                                                                                    */
/*  Copyright (c) 2005-2020, Michele Bosi                                             */
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/**************************************************************************************/

#ifndef VLXLinker_INCLUDE_ONCE
#define VLXLinker_INCLUDE_ONCE

#include <vlX/VisitorLinker.hpp>
#include <vlX/VisitorLinkMapper.hpp>

namespace vlX
{
  /** Links several VLX hierachies also resolving IDs across them. */
  class Linker
  {
  public:
    void add(VLXTaggedValue* module)
    {
      mModules.push_back(module);
    }

    bool link()
    {
      std::map< std::string, vl::ref<VLXStructure> > link_map;

      // map all the IDs to the appropriate VLXStructures
      VisitorLinkMapper link_mapper(&link_map);
      for(size_t i=0; i<mModules.size(); ++i)
        mModules[i]->acceptVisitor(&link_mapper);

      if (link_mapper.error())
        return false;

      // link all the IDs to the associated VLXStructure
      VisitorLinker linker(&link_map);
      for(size_t i=0; i<mModules.size(); ++i)
        mModules[i]->acceptVisitor(&linker);

      if (linker.error())
        return false;

      return true;
    }

    std::vector< vl::ref<VLXTaggedValue> >& modules() { return mModules; }

    const std::vector< vl::ref<VLXTaggedValue> >& modules() const { return mModules; }

  public:
    std::vector< vl::ref<VLXTaggedValue> > mModules;
  };
}

#endif