/*=========================================================================

  Program:   ParaView
  Module:    vtkExodusIIReaderParser.cxx

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkExodusIIReaderParser.h"

#include "vtkDataSetAttributes.h"
#include "vtkMutableDirectedGraph.h"
#include "vtkObjectFactory.h"
#include "vtkStringArray.h"
#include "vtkUnsignedCharArray.h"

#include <cassert>

vtkStandardNewMacro(vtkExodusIIReaderParser);
//------------------------------------------------------------------------------
vtkExodusIIReaderParser::vtkExodusIIReaderParser()
{
  this->SIL = vtkMutableDirectedGraph::New();
  this->InBlocks = false;
  this->InMaterialAssignments = false;
}

//------------------------------------------------------------------------------
vtkExodusIIReaderParser::~vtkExodusIIReaderParser()
{
  this->SIL->Delete();
  this->SIL = nullptr;
}

//------------------------------------------------------------------------------
void vtkExodusIIReaderParser::StartElement(const char* tagName, const char** attrs)
{
  const char* name = strrchr(tagName, ':');

  // If tag name has xml namespace separator, get rid of namespace:
  name = name ? name + 1 : tagName;
  std::string tName(name);

  if (tName == "solid-model")
  {
    // Move down to the Assemblies branch.
    this->CurrentVertex.push_back(this->AssembliesVertex);
  }
  else if (tName == "assembly")
  {
    // Starting a new "assembly" node. Get paratmeters for this assembly.
    const char* assemblyNumber = this->GetValue("number", attrs);
    const char* assemblyDescription = this->GetValue("description", attrs);

    // Setup the name for this node.
    std::string node_name = std::string("Assembly: ") + assemblyDescription + std::string(" (") +
      assemblyNumber + std::string(")");

    // Now add a vertex in the SIL for this assembly node.
    vtkIdType vertexID = this->AddVertexToSIL(node_name.c_str());
    this->AddChildEdgeToSIL(this->CurrentVertex.back(), vertexID);
    this->CurrentVertex.push_back(vertexID);
  }
  else if (tName == "part")
  {
    const char* instance = this->GetValue("instance", attrs);
    std::string instanceString = instance ? instance : "";
    const char* partNumber = this->GetValue("number", attrs);
    std::string partNumberBasicString;
    std::string partNumberString;
    if (partNumber)
    {
      partNumberBasicString = std::string(partNumber);
      partNumberString = std::string(partNumber) + std::string(" Instance: ") + instanceString;
    }

    const char* partDesc = this->GetValue("description", attrs);
    std::string partDescString;
    if (partDesc)
    {
      partDescString = std::string(partDesc);
    }

    // This will create a new vertex if none already present.
    vtkIdType partVertex = this->GetPartVertex(partNumberString.c_str());

    // Now fix the part vertex name.
    std::string result = std::string("Part: ") + partDescString + std::string(" (") +
      partNumberBasicString + std::string(")") + std::string(" Instance: ") + instanceString;
    this->NamesArray->InsertValue(partVertex, result.c_str());

    // Insert the part vertex info the assemblies hierarchy.
    this->AddChildEdgeToSIL(this->CurrentVertex.back(), partVertex);
    // The cross link between the part at the blocks it refers is added when the
    // <blocks/> are parsed.

    // Save the description for this part, this description is used later to
    // name the block appropriately.
    this->PartVertexID_To_Descriptions[partVertex] = partDescString;

    // Add a "part" vertex in the "Assemblies" hierarchy.
    this->CurrentVertex.push_back(partVertex);
  }
  else if (tName == "material-specification")
  {
    // The <part /> element may contain material-specification for each part.
    // These are used only if <material-assignments/> are not present.
    vtkIdType partVertex = this->CurrentVertex.back();

    const char* materialDescriptionString = this->GetValue("description", attrs);
    std::string material = materialDescriptionString ? materialDescriptionString : "";
    material += " : ";

    const char* materialSpecificationString = this->GetValue("specification", attrs);
    material += materialSpecificationString ? materialSpecificationString : "";

    this->MaterialSpecifications[partVertex] = material;
  }
  else if (tName == "mesh")
  {
    assert(this->CurrentVertex.empty());
    this->CurrentVertex.push_back(this->BlocksVertex);
  }
  else if (tName == "blocks")
  {
    const char* instance = this->GetValue("part-instance", attrs);
    std::string instanceString = instance ? instance : "";
    const char* partNumber = this->GetValue("part-number", attrs);
    std::string partNumberString;
    if (partNumber)
    {
      partNumberString = std::string(partNumber) + std::string(" Instance: ") + instanceString;
    }

    this->InBlocks = true;
    this->BlockPartNumberString = partNumberString;
  }
  else if (tName == "block")
  {
    const char* blockString = this->GetValue("id", attrs);
    int id = -1;
    if (blockString)
    {
      id = atoi(blockString);
    }

    if (id >= 0)
    {
      if (this->InBlocks && !this->BlockPartNumberString.empty())
      {
        // the name for the block is re-generated at the end.
        vtkIdType blockVertex = this->AddVertexToSIL(blockString);
        this->AddChildEdgeToSIL(this->BlocksVertex, blockVertex);

        // This <block /> element was encountered while reading the <mesh />.
        this->BlockID_To_VertexID[id] = blockVertex;

        this->BlockID_To_Part[id] = this->BlockPartNumberString;
        // // Add cross edge linking the assembly part to the block.
        // vtkIdType partVertex = this->CurrentVertex.back();
        // this->AddCrossEdgeToSIL(partVertex, blockVertex);
        // this->BlockID_To_PartVertexID[id] = partVertex;
      }
      else if (this->InMaterialAssignments)
      {
        // This <block /> element was encountered while reading the
        // <material-assignments />
        const char* tmaterialName = this->GetValue("material-name", attrs);
        if (tmaterialName)
        {
          // Save the material information for later since we may not have
          // seen the <blocks /> yet, consequently we have no mapping from
          // vertex to block id.
          this->BlockID_To_MaterialName[id] = tmaterialName;
        }
      }
    }
  }
  else if (tName == "material-assignments")
  {
    this->CurrentVertex.push_back(this->MaterialsVertex);
    this->InMaterialAssignments = true;
  }
  else if (tName == "material")
  {
    const char* material = this->GetValue("name", attrs);
    if (material)
    {
      const char* spec = this->GetValue("specification", attrs);
      const char* desc = this->GetValue("description", attrs);
      std::string node_name;
      if (desc)
      {
        node_name = desc;
      }
      else
      {
        node_name = material;
      }
      if (spec)
      {
        node_name += " : ";
        node_name += spec;
      }

      vtkIdType vertex = this->AddVertexToSIL(node_name.c_str());
      this->AddChildEdgeToSIL(this->MaterialsVertex, vertex);
      this->MaterialName_To_VertexID[material] = vertex;
    }
  }
}

//------------------------------------------------------------------------------
void vtkExodusIIReaderParser::EndElement(const char* tagName)
{
  const char* name = strrchr(tagName, ':');
  // If tag name has xml namespace separator, get rid of namespace:
  name = name ? name + 1 : tagName;
  std::string tName(name);
  if (tName == "solid-model")
  {
    this->CurrentVertex.pop_back();
  }
  else if (tName == "assembly")
  {
    this->CurrentVertex.pop_back();
  }
  else if (tName == "part")
  {
    this->CurrentVertex.pop_back();
  }
  else if (tName == "mesh")
  {
    this->CurrentVertex.pop_back();
  }
  else if (tName == "blocks")
  {
    this->InBlocks = false;
    this->BlockPartNumberString = "";
  }
  else if (tName == "material-assignments")
  {
    this->InMaterialAssignments = false;
    this->CurrentVertex.pop_back();
  }
}

//------------------------------------------------------------------------------
void vtkExodusIIReaderParser::FinishedParsing()
{
  std::map<int, vtkIdType> blockID_to_partVertexID;

  // * Is assembly was parsed, add cross links between assembly parts and blocks
  //   belonging to that part.
  if (!this->Part_To_VertexID.empty())
  {
    std::map<int, std::string>::iterator iterIS;
    for (iterIS = this->BlockID_To_Part.begin(); iterIS != this->BlockID_To_Part.end(); ++iterIS)
    {
      if (this->Part_To_VertexID.find(iterIS->second) == this->Part_To_VertexID.end())
      {
        // This block blongs to a part not present in the assembly.
        continue;
      }
      vtkIdType partVertex = this->Part_To_VertexID[iterIS->second];
      vtkIdType blockVertex = this->BlockID_To_VertexID[iterIS->first];
      this->AddCrossEdgeToSIL(partVertex, blockVertex);
      blockID_to_partVertexID[iterIS->first] = partVertex;
    }
  }

  // * Assign correct names for all the "block" vertices.
  std::map<int, vtkIdType>::iterator iter;
  for (iter = this->BlockID_To_VertexID.begin(); iter != this->BlockID_To_VertexID.end(); ++iter)
  {
    // To locate the part description for this block, first locate the part to
    // which this block belongs.
    std::string desc = "None";
    if (blockID_to_partVertexID.find(iter->first) != blockID_to_partVertexID.end())
    {
      vtkIdType partVertex = blockID_to_partVertexID[iter->first];
      desc = this->PartVertexID_To_Descriptions[partVertex];
    }

    std::ostringstream stream;
    stream << "Block: " << iter->first << " (" << desc.c_str() << ") "
           << this->BlockID_To_Part[iter->first].c_str();
    this->NamesArray->SetValue(iter->second, stream.str().c_str());
  }

  //// * If <material-assignments /> are not present use
  //// <material-specification /> to construct material assignments.
  if (this->BlockID_To_MaterialName.empty())
  {
    std::map<int, vtkIdType>::iterator iterII;
    for (iterII = blockID_to_partVertexID.begin(); iterII != blockID_to_partVertexID.end();
         ++iterII)
    {
      int blockID = iterII->first;
      vtkIdType partVertex = iterII->second;

      std::string node_name = this->MaterialSpecifications[partVertex];
      vtkIdType materialVertex;
      if (this->MaterialName_To_VertexID.find(node_name) == this->MaterialName_To_VertexID.end())
      {
        materialVertex = this->AddVertexToSIL(node_name.c_str());
        this->AddChildEdgeToSIL(this->MaterialsVertex, materialVertex);
        this->MaterialName_To_VertexID[node_name] = materialVertex;
      }
      else
      {
        materialVertex = this->MaterialName_To_VertexID[node_name];
      }
      this->BlockID_To_MaterialName[blockID] = node_name;
    }
  }

  //// * Add cross-links between "block" vertices and "material" vertices.
  std::map<int, std::string>::iterator iter2;
  for (iter2 = this->BlockID_To_MaterialName.begin(); iter2 != this->BlockID_To_MaterialName.end();
       ++iter2)
  {
    vtkIdType blockVertex = this->BlockID_To_VertexID[iter2->first];
    if (this->MaterialName_To_VertexID.find(iter2->second) != this->MaterialName_To_VertexID.end())
    {
      vtkIdType materialVertex = this->MaterialName_To_VertexID[iter2->second];
      this->AddCrossEdgeToSIL(materialVertex, blockVertex);
    }
  }
}

//------------------------------------------------------------------------------
vtkIdType vtkExodusIIReaderParser::AddVertexToSIL(const char* name)
{
  vtkIdType vertex = this->SIL->AddVertex();
  this->NamesArray->InsertValue(vertex, name);
  return vertex;
}

//------------------------------------------------------------------------------
vtkIdType vtkExodusIIReaderParser::AddChildEdgeToSIL(vtkIdType src, vtkIdType dst)
{
  vtkIdType id = this->SIL->AddEdge(src, dst).Id;
  this->CrossEdgesArray->InsertValue(id, 0);
  return id;
}

//------------------------------------------------------------------------------
vtkIdType vtkExodusIIReaderParser::AddCrossEdgeToSIL(vtkIdType src, vtkIdType dst)
{
  vtkIdType id = this->SIL->AddEdge(src, dst).Id;
  this->CrossEdgesArray->InsertValue(id, 1);
  return id;
}

//------------------------------------------------------------------------------
vtkIdType vtkExodusIIReaderParser::GetPartVertex(const char* part_number_instance_string)
{
  std::map<std::string, vtkIdType>::iterator iter =
    this->Part_To_VertexID.find(part_number_instance_string);
  if (iter != this->Part_To_VertexID.end())
  {
    return iter->second;
  }

  // The name here is temporary. The full name for a the "part" nodes is
  // determined when the assembly is parsed.
  vtkIdType vertex = this->AddVertexToSIL(part_number_instance_string);
  // Save the vertex for later use.
  this->Part_To_VertexID[part_number_instance_string] = vertex;
  return vertex;
}

//------------------------------------------------------------------------------
void vtkExodusIIReaderParser::Go(const char* filename)
{
  this->SIL->Initialize();
  this->CurrentVertex.clear();
  this->BlockID_To_VertexID.clear();
  this->BlockID_To_MaterialName.clear();
  this->MaterialName_To_VertexID.clear();
  this->PartVertexID_To_Descriptions.clear();
  this->Part_To_VertexID.clear();
  this->MaterialSpecifications.clear();
  this->BlockID_To_Part.clear();
  this->InBlocks = false;
  this->InMaterialAssignments = false;

  this->NamesArray = vtkSmartPointer<vtkStringArray>::New();
  this->NamesArray->SetName("Names");
  this->CrossEdgesArray = vtkSmartPointer<vtkUnsignedCharArray>::New();
  this->CrossEdgesArray->SetName("CrossEdges");
  this->SIL->GetVertexData()->AddArray(this->NamesArray);
  this->SIL->GetEdgeData()->AddArray(this->CrossEdgesArray);

  this->RootVertex = this->AddVertexToSIL("SIL");
  this->BlocksVertex = this->AddVertexToSIL("Blocks");
  this->AssembliesVertex = this->AddVertexToSIL("Assemblies");
  this->MaterialsVertex = this->AddVertexToSIL("Materials");
  this->AddChildEdgeToSIL(this->RootVertex, this->BlocksVertex);
  this->AddChildEdgeToSIL(this->RootVertex, this->AssembliesVertex);
  this->AddChildEdgeToSIL(this->RootVertex, this->MaterialsVertex);

  this->SetFileName(filename);
  this->Parse();
  this->FinishedParsing();
}

//------------------------------------------------------------------------------
std::string vtkExodusIIReaderParser::GetBlockName(int id)
{
  if (this->BlockID_To_VertexID.find(id) != this->BlockID_To_VertexID.end())
  {
    vtkIdType vertex = this->BlockID_To_VertexID[id];
    return this->NamesArray->GetValue(vertex);
  }
  return "";
}

//------------------------------------------------------------------------------
void vtkExodusIIReaderParser::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "SIL: " << this->SIL << endl;
}
