//=========================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt 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 "smtk/attribute/FileItem.h"
#include "smtk/attribute/IntItem.h"
#include "smtk/attribute/MeshItem.h"

#include "smtk/io/ModelToMesh.h"
#include "smtk/io/ReadMesh.h"
#include "smtk/io/WriteMesh.h"

#include "smtk/model/DefaultSession.h"

#include "smtk/mesh/core/Resource.h"

#include "smtk/model/Resource.h"

#include <fstream>

//force to use filesystem version 3
#define BOOST_FILESYSTEM_VERSION 3
#include <boost/filesystem.hpp>
using namespace boost::filesystem;

namespace
{
//SMTK_DATA_DIR is a define setup by cmake
std::string write_root = SMTK_SCRATCH_DIR;

void create_simple_mesh_model(smtk::model::ResourcePtr mgr, std::string file_path)
{
  std::ifstream file(file_path.c_str());

  std::string json((std::istreambuf_iterator<char>(file)), (std::istreambuf_iterator<char>()));

  //we should load in the test2D.json file as an smtk to model
  smtk::io::LoadJSON::intoModelResource(json.c_str(), mgr);
  mgr->assignDefaultNames();

  file.close();
}

void cleanup(const std::string& file_path)
{
  //first verify the file exists
  ::boost::filesystem::path path(file_path);
  if (::boost::filesystem::is_regular_file(path))
  {
    //remove the file_path if it exists.
    ::boost::filesystem::remove(path);
  }
}
}

int main(int argc, char* argv[])
{
  if (argc > 1)
  {
    std::ifstream file;
    file.open(argv[1]);
    if (!file.good())
    {
      std::cout << "Could not open file \"" << argv[1] << "\".\n\n";
      return 1;
    }

    std::vector<std::string> files_to_delete;

    // Create a model resource
    smtk::model::ResourcePtr resource = smtk::model::Resource::create();

    // Identify available sessions
    std::cout << "Available sessions\n";
    typedef smtk::model::StringList StringList;
    StringList sessions = resource->sessionTypeNames();
    smtk::mesh::ManagerPtr meshManager = resource->meshes();
    for (StringList::iterator it = sessions.begin(); it != sessions.end(); ++it)
      std::cout << "  " << *it << "\n";
    std::cout << "\n";

    // Create a new default session
    smtk::model::SessionRef sessRef = resource->createSession("native");

    // Identify available operators
    std::cout << "Available cmb operators\n";
    StringList opnames = sessRef.session()->operatorNames();
    for (StringList::iterator it = opnames.begin(); it != opnames.end(); ++it)
    {
      std::cout << "  " << *it << "\n";
    }
    std::cout << "\n";

    create_simple_mesh_model(resource, std::string(argv[1]));
    smtk::io::ModelToMesh convert;
    smtk::mesh::ResourcePtr c = convert(meshManager, resource);

    // Test all three mesh file types
    std::string extension[2] = { ".exo", ".h5m" };

    for (int fileType = 0; fileType < 2; ++fileType)
    {
      std::cout << "Testing file type " << extension[fileType] << std::endl;

      // Create a new "write mesh" operator
      smtk::operation::OperationPtr writeMeshOp = sessRef.session()->op("write mesh");
      if (!writeMeshOp)
      {
        std::cerr << "No \"write mesh\" operator\n";
        return 1;
      }

      // Set "write mesh" operator's file
      std::string write_path = std::string(write_root + "/testmesh" + extension[fileType]);
      writeMeshOp->specification()->findFile("filename")->setValue(write_path);

      bool valueSet = writeMeshOp->specification()->findMesh("mesh")->setValue(
        meshManager->collectionBegin()->second->meshes());

      if (!valueSet)
      {
        std::cerr << "Failed to set mesh value on write mesh operator\n";
        return 1;
      }

      // Execute "write mesh" operator...
      smtk::operation::OperationResult writeMeshOpResult = writeMeshOp->operate();
      // ...and test the results for success.
      if (writeMeshOpResult->findInt("outcome")->value() !=
        smtk::operation::Operation::OPERATION_SUCCEEDED)
      {
        std::cerr << "Write mesh operator failed\n";
        return 1;
      }

      // Grab the original mesh collection
      smtk::mesh::ResourcePtr c = sessRef.session()->meshManager()->collectionBegin()->second;
      if (c->isModified())
      {
        std::cerr << "collection shouldn't be marked as modified" << std::endl;
        return 1;
      }

      // Reload the written file and verify the number of meshes are the same as
      // the input mesh
      //
      // NB: a new mesh manager must be used here. If the original mesh manager
      //     is used instead, a corrupt collection is added to our resource and
      //     our little trick of grabbing the first collection above will result
      //     in test failures.
      smtk::mesh::ManagerPtr m2 = smtk::mesh::Manager::create();
      smtk::io::ReadMesh read;
      smtk::mesh::ResourcePtr c2 = read(write_path, m2);
      if (c2->isModified())
      {
        std::cerr << "collection shouldn't be marked as modified" << std::endl;
        return 1;
      }

      // Remove the file from disk
      cleanup(write_path);

      // Verify the meshes
      if (!c2->isValid())
      {
        std::cerr << "collection should be valid" << std::endl;
        return 1;
      }
      if (c2->name() != c->name())
      {
        std::cerr << "collection names do not match" << std::endl;
        return 1;
      }

      // We only guarantee that Moab's native .h5m format is bidirectional. The
      // other mesh formats will write, but information is lost when they are
      // subsequently imported.
      if (extension[fileType] == ".h5m")
      {
        if (c2->numberOfMeshes() != c->numberOfMeshes())
        {
          std::cerr << "number of meshes do not match" << std::endl;
          return 1;
        }
        if (c2->types() != c->types())
        {
          std::cerr << "collection types do not match" << std::endl;
          return 1;
        }
      }
    }
  }

  return 0;
}
