#include "Element.h"
#include "DOFAdmin.h"
#include "Mesh.h"
#include "CoarseningManager.h"
#include "FixVec.h"
#include "ElementRegion_ED.h"

namespace AMDiS {

  std::map<DegreeOfFreedom*, bool> Element::deletedDOFs;

  int Element::getRegion() const 
  {
    if (!elementData) 
      return -1;

    ElementRegion_ED* red = 
      dynamic_cast<ElementRegion_ED*>(elementData->getElementData(ELEMENT_REGION));

    if (red)
      return red->getRegion();    
    
    return -1;
  }

  void Element::setDOFPtrs()
  {
    FUNCNAME("Element::setDOFPtrs()");

    TEST_EXIT_DBG(mesh)("no mesh!\n");

    dof = mesh->createDOFPtrs();  
  }

  Element::Element(Mesh *aMesh)
  {
    mesh = aMesh;
    index = mesh ? mesh->getNextElementIndex() : -1; 
    child[0] = NULL;
    child[1] = NULL;
    newCoord = NULL;
    elementData = NULL;
    mark = 0;

    if (mesh) {
      setDOFPtrs();
    } else {
      mesh = NULL;
    }
  }

  // call destructor through Mesh::freeElement !!!
  Element::~Element()
  {  
    if (child[0])
      delete child[0];
    
    if (child[1])
      delete child[1];   

    if (newCoord)
      delete newCoord;    

    if (elementData) {
      elementData->deleteDecorated();
      delete elementData;
    }
  }

  bool Element::deleteElementData(int typeID)
  {
    FUNCNAME("Element::deleteElementData()");

    if (elementData) {
      if (elementData->isOfType(typeID)) {
	ElementData *tmp = elementData;
	elementData = elementData->getDecorated();
	delete tmp;
	tmp = NULL;
	return true;
      } else {
	return elementData->deleteDecorated(typeID);
      }
    }
    return false;
  }

  void Element::deleteElementDOFs()
  {
    int dim = mesh->getDim();
    int j = 0;

    for (int pos = 0; pos <= dim; pos++) {
      GeoIndex position = INDEX_OF_DIM(pos, dim);
      int ndof = 0;
     
      for (int i = 0; i < mesh->getNumberOfDOFAdmin(); i++) {
	ndof += mesh->getDOFAdmin(i).getNumberOfDOFs(position);
      }

      if (ndof > 0) {
	for (int i = 0; i < mesh->getGeo(position); i++) {
	  if (dof[j]) {
	    if (deletedDOFs.count(dof[j]) == 0) {
	      deletedDOFs[dof[j]] = true;
	      delete [] dof[j];
	    }
	  }  
	  j++;
	}
      }
    }

    FREE_MEMORY(dof, DegreeOfFreedom*, mesh->getNumberOfNodes());
    
    if (child[0])
      child[0]->deleteElementDOFs();
    if (child[1])
      child[1]->deleteElementDOFs();
  }

  Element* Element::cloneWithDOFs()
  {
    Element *el;
    
    if (isLine()) {
      el = new Line(NULL);
    } else if (isTriangle()) {
      el = new Triangle(NULL);
    } else {
      el = new Tetrahedron(NULL);
    }

    el->mesh = mesh;
    el->index = index;
    el->mark = mark;
    if (newCoord) {
      WorldVector<double> *nc = new WorldVector<double>();
      *nc = *newCoord;
      el->newCoord = nc;
    }
    
    /* =========== And here we clone the DOFs =========== */
   
    el->dof = new DegreeOfFreedom*[mesh->getNumberOfNodes()];

    int dim = mesh->getDim();
    int j = 0;

    for (int pos = 0; pos <= dim; pos++) {
      GeoIndex position = INDEX_OF_DIM(pos, dim);
      int ndof = 0;

      for (int i = 0; i < mesh->getNumberOfDOFAdmin(); i++)
	ndof += mesh->getDOFAdmin(i).getNumberOfDOFs(position);

      if (ndof > 0) {
	for (int i = 0; i < mesh->getGeo(position); i++) {
	  if (dof[j] != NULL) {
	    if (Mesh::serializedDOFs[dof[j][0]] == NULL) {
	      el->dof[j] = new DegreeOfFreedom[ndof];
	      for (int k = 0; k < ndof; k++)
		el->dof[j][k] = dof[j][k];

	      Mesh::serializedDOFs[dof[j][0]] = el->dof[j];
	    } else {
	      el->dof[j] = Mesh::serializedDOFs[dof[j][0]];
	    }
	  } else {
	    el->dof[j] = NULL;
	  }
	  j++;
	}
      }
    }
    
    /* =========== And clone the children ============= */

    if (child[0]) {
      el->child[0] = child[0]->cloneWithDOFs();
    }
    if (child[1]) {
      el->child[1] = child[1]->cloneWithDOFs();
    }

    return el;
  }

  /****************************************************************************/
  /*  ATTENTION:                                                              */
  /*  new_dof_fct() destroys new_dof !!!!!!!!!!                               */
  /*  should be used only at the end of dof_compress()!!!!!                   */
  /****************************************************************************/

  /* CHANGE_DOFS_1 changes old dofs to NEGATIVE new dofs */

#define CHANGE_DOFS_1(el)						\
  ldof = el->dof[n0 + i] + nd0;						\
    for (j = 0; j < nd; j++) {						\
      if ((k = ldof[j]) >= 0) {						\
	/* do it only once! (dofs are visited more than once) */	\
	ldof[j] = - admin->getMesh()->newDOF[k] - 1;			\
      } }

  /* CHANGE_DOFS_2 changes NEGATIVE new dofs to POSITIVE */

#define CHANGE_DOFS_2(el)						\
  ldof = el->dof[n0+i] + nd0;						\
    for (j = 0; j < nd; j++) {						\
      if ((k = ldof[j]) < 0) {						\
	/* do it only once! (dofs are visited more than once) */	\
	ldof[j] = - k - 1;						\
      } }

  void Element::newDOFFct1(const DOFAdmin* admin)
  {
    int j, k, n0, nd, nd0;
    DegreeOfFreedom *ldof;  
    int vertices = mesh->getGeo(VERTEX);
    int edges = mesh->getGeo(EDGE); 
    int faces = mesh->getGeo(FACE);

    if ((nd = admin->getNumberOfDOFs(VERTEX)))  {
      nd0 = admin->getNumberOfPreDOFs(VERTEX);
      n0 = admin->getMesh()->getNode(VERTEX);
      for (int i = 0; i < vertices; i++) {
	CHANGE_DOFS_1(this);
      }
    }

    if (mesh->getDim() > 1) {
      if ((nd = admin->getNumberOfDOFs(EDGE)))  {
	nd0 = admin->getNumberOfPreDOFs(EDGE);
	n0 = admin->getMesh()->getNode(EDGE);
	for (int i = 0; i < edges; i++) {
	  CHANGE_DOFS_1(this);
	}
      }
    }

    if (mesh->getDim() == 3) {
      if ((nd = admin->getNumberOfDOFs(FACE)))  {
	nd0 = admin->getNumberOfPreDOFs(FACE);
	n0 = admin->getMesh()->getNode(FACE);
	for (int i = 0; i < faces; i++) {
	  CHANGE_DOFS_1(this);
	}
      }
    }

    if ((nd = admin->getNumberOfDOFs(CENTER)))  {
      nd0 = admin->getNumberOfPreDOFs(CENTER);
      n0 = admin->getMesh()->getNode(CENTER);
      int i = 0;          /* only one center */
      CHANGE_DOFS_1(this);
    }
  }


  void Element::newDOFFct2(const DOFAdmin* admin)
  {
    int i, j, k, n0, nd, nd0;
    DegreeOfFreedom  *ldof;
    int vertices = mesh->getGeo(VERTEX);
    int edges = mesh->getGeo(EDGE); 
    int faces = mesh->getGeo(FACE);

    if ((nd = admin->getNumberOfDOFs(VERTEX)))  {
      nd0 = admin->getNumberOfPreDOFs(VERTEX);
      n0 = admin->getMesh()->getNode(VERTEX);
      for (i = 0; i < vertices; i++) {
	CHANGE_DOFS_2(this);
      }
    }

    if (mesh->getDim() > 1) {
      if ((nd = admin->getNumberOfDOFs(EDGE)))  {
	nd0 = admin->getNumberOfPreDOFs(EDGE);
	n0 = admin->getMesh()->getNode(EDGE);
	for (i = 0; i < edges; i++) {
	  CHANGE_DOFS_2(this);
	}
      }
    }

    if (mesh->getDim() == 3) {
      if ((nd = admin->getNumberOfDOFs(FACE)))  {
	nd0 = admin->getNumberOfPreDOFs(FACE);
	n0 = admin->getMesh()->getNode(FACE);
	for (i = 0; i < faces; i++) {
	  CHANGE_DOFS_2(this);
	}
      }
    }

    if ((nd = admin->getNumberOfDOFs(CENTER)))  {
      nd0 = admin->getNumberOfPreDOFs(CENTER);
      n0 = admin->getMesh()->getNode(CENTER);
      i = 0;          /* only one center */
      CHANGE_DOFS_2(this);
    }
  }

#undef CHANGE_DOFS_1
#undef CHANGE_DOFS_2

  /****************************************************************************/
  /* opp_vertex checks whether the face with vertices dof[0],..,dof[DIM-1] is */
  /* part of mel's boundary. returns the opposite vertex if true, -1 else     */
  /****************************************************************************/

  int Element::oppVertex(FixVec<DegreeOfFreedom*, DIMEN> pdof) const
  {
    int nv = 0;
    int ov = 0;
    int vertices = mesh->getGeo(VERTEX);
    int dim = mesh->getDim();

    for (int i = 0; i < vertices; i++) {
      if (nv < i - 1)  
	return(-1);

      for (int j = 0; j < dim; j++) {
	if (dof[i] == pdof[j]) {
	  /****************************************************************************/
	  /* i is a common vertex                                                     */
	  /****************************************************************************/
	  ov += i;
	  nv++;
	  break;
	}
      }

    }
    
    if (nv != mesh->getDim()) 
      return(-1);
    /****************************************************************************/
    /*  the opposite vertex is 3(6) - (sum of indices of common vertices) in    */
    /*  2d(3d)                                                                  */
    /****************************************************************************/

    switch(mesh->getDim()) {
    case 1:
      return ov;
      break;
    case 2:
      return 3 - ov;
      break;
    case 3:
      return 6 - ov;
      break;
    default:
      ERROR_EXIT("invalid dim\n");
      return 0;
    }
  }

  void Element::eraseNewCoord() {
    if (newCoord != NULL) {
      delete newCoord;
      newCoord = NULL;
    }
  }
 
  void Element::serialize(std::ostream &out) 
  {
    // write children
    if (child[0]) {
      out << child[0]->getTypeName() << "\n";
      child[0]->serialize(out);
      child[1]->serialize(out);
    } else {
      out << "NULL\n";
    }

    // write dofs
    int dim = mesh->getDim();
    int nodes = mesh->getNumberOfNodes();
    int j = 0;
    out.write(reinterpret_cast<const char*>(&nodes), sizeof(int));
   
    for (int pos = 0; pos <= dim; pos++) {
      GeoIndex position = INDEX_OF_DIM(pos, dim);
      int ndof = 0;

      for (int i = 0; i < mesh->getNumberOfDOFAdmin(); i++) {
	ndof += mesh->getDOFAdmin(i).getNumberOfDOFs(position);	
      }

      if (ndof > 0) {
	for (int i = 0; i < mesh->getGeo(position); i++) {
	  if (dof[j] != NULL) {
	    if (Mesh::serializedDOFs[dof[j][0]] == NULL) {
	      Mesh::serializedDOFs[dof[j][0]] = dof[j];
	      out.write(reinterpret_cast<const char*>(&ndof), sizeof(int));
	      out.write(reinterpret_cast<const char*>(dof[j]), ndof * sizeof(DegreeOfFreedom));
	    } else {
	      int minusOne = -1;
	      out.write(reinterpret_cast<const char*>(&minusOne), sizeof(int));
	      out.write(reinterpret_cast<const char*>(&(dof[j][0])), sizeof(DegreeOfFreedom));
	    }
	  } else {
	    int zero = 0;
	    out.write(reinterpret_cast<const char*>(&zero), sizeof(int));
	  }
	  j++;
	}
      }
    }

    // write index
    out.write(reinterpret_cast<const char*>(&index), sizeof(int));

    // write mark
    out.write(reinterpret_cast<const char*>(&mark), sizeof(signed char));

    // write newCoord
    if (newCoord) {
      out << "WorldVector\n";
      newCoord->serialize(out);
    } else {
      out << "NULL\n";
    }

    // write element data
    if (elementData) {
      out << elementData->getTypeName() << "\n";
      elementData->serialize(out);
    } else {
      out << "NULL\n";
    }
  }

  void Element::deserialize(std::istream &in)
  {
    std::string typeName;

    // read children
    in >> typeName;
    in.get();

    if (typeName != "NULL") {
      if (typeName == "Line") {
	child[0] = new Line(NULL);
	child[1] = new Line(NULL);      
      }
      if (typeName == "Triangle") {
	child[0] = new Triangle(NULL);
	child[1] = new Triangle(NULL);      
      }
      if (typeName == "Tetrahedron") {
	child[0] = new Tetrahedron(NULL);
	child[1] = new Tetrahedron(NULL);      
      }
      child[0]->deserialize(in);
      child[1]->deserialize(in);
    } else {
      child[0] = child[1] = NULL;
    }

    // read dofs
    int nodes;
    in.read(reinterpret_cast<char*>(&nodes), sizeof(int));

    dof = new DegreeOfFreedom*[nodes]; 

    for (int i = 0; i < nodes; i++) {
      int dofs;
      in.read(reinterpret_cast<char*>(&dofs), sizeof(int));

      if (dofs) {
	if (dofs != -1) {
	  dof[i] = new DegreeOfFreedom[dofs];
	  in.read(reinterpret_cast<char*>(dof[i]), dofs * sizeof(DegreeOfFreedom));
	  if (Mesh::serializedDOFs[dof[i][0]] != NULL) {
	    DegreeOfFreedom *dofPtr = Mesh::serializedDOFs[dof[i][0]];
	    delete [] dof[i];
	    dof[i] = dofPtr;
	  } else {
	    Mesh::serializedDOFs[dof[i][0]] = dof[i];
	  }
	} else {
	  DegreeOfFreedom index;
	  in.read(reinterpret_cast<char*>(&index), sizeof(DegreeOfFreedom));
	  dof[i] = Mesh::serializedDOFs[index];
	}
      } else {
	dof[i] = NULL;
      }
    }
    
    // read index
    in.read(reinterpret_cast<char*>(&index), sizeof(int));

    // read mark
    in.read(reinterpret_cast<char*>(&mark), sizeof(signed char));

    // read newCoord
    in >> typeName;
    in.get();

    if (typeName != "NULL") {
      if (typeName == "WorldVector") {
	newCoord = new WorldVector<double>;
	newCoord->deserialize(in);
      } else {
	ERROR_EXIT("unexpected type name\n");
      }
    } else {
      newCoord = NULL;
    }

    // read element data
    in >> typeName;
    in.get();

    if (typeName != "NULL") {
      elementData = CreatorMap<ElementData>::getCreator(typeName)->create();
      if (elementData) {
	elementData->deserialize(in);
      } else {
	ERROR_EXIT("unexpected type name\n");
      }
    } else {
      elementData = NULL;
    }
  }

  int Element::calcMemoryUsage()
  {
    int result = 0;

    result += sizeof(Element);
    result += mesh->getNumberOfNodes() * sizeof(DegreeOfFreedom*);

    if (child[0]) {
      result += child[0]->calcMemoryUsage() + child[1]->calcMemoryUsage();
    }

    return result;
  }

}