#ifndef _X3D_PARSER_XERCES__H
#define _X3D_PARSER_XERCES__H

// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/sax/HandlerBase.hpp>
#include "Mesh.h"
#include <stack>

XERCES_CPP_NAMESPACE_USE
XERCES_CPP_NAMESPACE_BEGIN
class AttributeList;
XERCES_CPP_NAMESPACE_END

namespace GtpVisibilityPreprocessor {

class SceneGraphNode;
class Mesh;
class Material;
class ViewCellsManager;



class X3dParseHandlers : public HandlerBase
{
public:

	// used for generating name / key pair
	struct ltstr
	{
		bool operator()(const std::string &s1, const std::string &s2) const
		{
			return s1 < s2;
		}
	};

	typedef map<string, int, ltstr> ResourceDefinitions;

  // -----------------------------------------------------------------------
  //  Constructors and Destructor
  // -----------------------------------------------------------------------
  X3dParseHandlers(SceneGraphNode *root, const bool loadMeshes = false);
  ~X3dParseHandlers();
  
  
  // -----------------------------------------------------------------------
  //  Getter methods
  // -----------------------------------------------------------------------
  unsigned int GetElementCount()
  {
    return mElementCount;
  }
  
  unsigned int GetAttrCount()
  {
    return mAttrCount;
  }
  
  unsigned int GetCharacterCount()
  {
    return mCharacterCount;
  }
  
  unsigned int GetSpaceCount()
  {
    return mSpaceCount;
  }


  // -----------------------------------------------------------------------
  //  Handlers for the SAX DocumentHandler interface
  // -----------------------------------------------------------------------
  void endElement(const XMLCh* const name);
  void startElement(const XMLCh* const name, AttributeList& attributes);
  void characters(const XMLCh* const chars, const unsigned int length);
  void ignorableWhitespace(const XMLCh* const chars, const unsigned int length);
  void resetDocument();

  SceneGraphNode *mCurrentNode;
 
  vector<VertexIndexContainer> mCurrentVertexIndices;
  VertexContainer mCurrentVertices;

  //string mCurrentMeshName;
  Mesh *mCurrentMesh;

  Material *mCurrentMaterial;
  
  bool mLoadMeshes;

  typedef stack<Matrix4x4> TrafoStack;

  bool mUsingMeshDefinition;

  // stack of accumulated transformations
  TrafoStack mTransformations;

  ResourceDefinitions mMaterialDefinitions;
  ResourceDefinitions mMeshDefinitions;

  bool mIsMeshDefinition;

  // Handlers for X3D
  void
  StartIndexedFaceSet(
		      AttributeList&  attributes);
  
  void
  EndShape();

  void EndTransform();
  void StartTransform(AttributeList&  attributes);

  void
  StartCoordinate(
		  AttributeList&  attributes);

  void
  StartMaterial(
		AttributeList&  attributes);
  
  /** applies transformation matrix m to this mesh.
  */
  void ApplyTransformation(Mesh *mesh, const Matrix4x4 &m) const;

  /** transforms mesh using the given transformations.
  */
  void ApplyTransformations(TrafoStack trafos, Mesh *mesh) const;
  void ApplyTransformations(TrafoStack trafos, TransformedMeshInstance *mi) const;

  static int mUniqueMeshIdx;

  // -----------------------------------------------------------------------
  //  Handlers for the SAX ErrorHandler interface
  // -----------------------------------------------------------------------
  void warning(const SAXParseException& exc);
  void error(const SAXParseException& exc);
  void fatalError(const SAXParseException& exc);
  
  
private:
  // -----------------------------------------------------------------------
  //  Private data members
  //
  //  fAttrCount
  //  fCharacterCount
  //  fElementCount
  //  fSpaceCount
  //      These are just counters that are run upwards based on the input
  //      from the document handlers.
  // -----------------------------------------------------------------------
  unsigned int    mAttrCount;
  unsigned int    mCharacterCount;
  unsigned int    mElementCount;
  unsigned int    mSpaceCount;
};

/** Parser handlers for view cell x3d files.
*/
class X3dViewCellsParseHandlers : public HandlerBase
{
public:
  // -----------------------------------------------------------------------
  //  Constructors and Destructor
  // -----------------------------------------------------------------------
  X3dViewCellsParseHandlers(ViewCellsManager *viewCellsManager, 
							const float viewCellHeight);
  ~X3dViewCellsParseHandlers();
  
  
  // -----------------------------------------------------------------------
  //  Getter methods
  // -----------------------------------------------------------------------
  unsigned int GetElementCount()
  {
    return mElementCount;
  }
  
  unsigned int GetAttrCount()
  {
    return mAttrCount;
  }
  
  unsigned int GetCharacterCount()
  {
    return mCharacterCount;
  }
  
  unsigned int GetSpaceCount()
  {
    return mSpaceCount;
  }


  // -----------------------------------------------------------------------
  //  Handlers for the SAX DocumentHandler interface
  // -----------------------------------------------------------------------
  void endElement(const XMLCh* const name);
  void startElement(const XMLCh* const name, AttributeList& attributes);
  void characters(const XMLCh* const chars, const unsigned int length);
  void ignorableWhitespace(const XMLCh* const chars, const unsigned int length);
  void resetDocument();

  ViewCellsManager *mViewCellsManager;
  float mViewCellHeight;
 

  VertexIndexContainer mCurrentVertexIndices;
  VertexContainer mCurrentVertices;

  // Handlers for X3D
  void
  StartIndexedFaceSet(
		      AttributeList&  attributes);
  
  void
  EndShape();

  void
  StartCoordinate(
		  AttributeList&  attributes);

  void
  StartMaterial(
		AttributeList&  attributes);
  
  
  // -----------------------------------------------------------------------
  //  Handlers for the SAX ErrorHandler interface
  // -----------------------------------------------------------------------
  void warning(const SAXParseException& exc);
  void error(const SAXParseException& exc);
  void fatalError(const SAXParseException& exc);
  
  
private:
  // -----------------------------------------------------------------------
  //  Private data members
  //
  //  fAttrCount
  //  fCharacterCount
  //  fElementCount
  //  fSpaceCount
  //      These are just counters that are run upwards based on the input
  //      from the document handlers.
  // -----------------------------------------------------------------------
  unsigned int    mAttrCount;
  unsigned int    mCharacterCount;
  unsigned int    mElementCount;
  unsigned int    mSpaceCount;
};


// ---------------------------------------------------------------------------
//  This is a simple class that lets us do easy (though not terribly efficient)
//  trancoding of XMLCh data to local code page for display.
// ---------------------------------------------------------------------------
class StrX
{
public :
  // -----------------------------------------------------------------------
  //  Constructors and Destructor
  // -----------------------------------------------------------------------
  StrX(const XMLCh* const toTranscode)
  {
    // Call the private transcoding method
    mLocalForm = XMLString::transcode(toTranscode);
  }
  
  ~StrX()
  {
    XMLString::release(&mLocalForm);
  }
  
  // -----------------------------------------------------------------------
  //  Getter methods
  // -----------------------------------------------------------------------
  const char* LocalForm() const
  {
    return mLocalForm;
  }
  
private :
  // -----------------------------------------------------------------------
  //  Private data members
  //
  //  fLocalForm
  //      This is the local code page form of the string.
  // -----------------------------------------------------------------------
  char*   mLocalForm;
};

inline XERCES_STD_QUALIFIER ostream&
operator<<(XERCES_STD_QUALIFIER ostream& target, const StrX& toDump)
{
  target << toDump.LocalForm();
  return target;
}

}

#endif