//============================================================================
//  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.
//
//  Copyright 2015 Sandia Corporation.
//  Copyright 2015 UT-Battelle, LLC.
//  Copyright 2015 Los Alamos National Security.
//
//  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
//  the U.S. Government retains certain rights in this software.
//
//  Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
//  Laboratory (LANL), the U.S. Government retains certain rights in
//  this software.
//============================================================================

#include <vtkm/cont/DynamicCellSet.h>

#include <vtkm/cont/ArrayHandleConstant.h>

#include <vtkm/cont/testing/Testing.h>

namespace {

struct NonDefaultCellSetList
    : vtkm::ListTagBase<
        vtkm::cont::CellSetStructured<1>,
        vtkm::cont::CellSetExplicit<vtkm::cont::ArrayHandleConstant<vtkm::Id>::StorageTag > >
{  };

bool CheckCalled;

template<typename ExpectedCellType>
struct CheckFunctor
{
  void operator()(const ExpectedCellType &) const
  {
    CheckCalled = true;
  }

  template<typename UnexpectedType>
  void operator()(const UnexpectedType &) const
  {
    VTKM_TEST_FAIL("CastAndCall functor called with wrong type.");
  }
};

template<typename CellSetType, typename CellSetList>
void CheckDynamicCellSet(
    const CellSetType &cellSet,
    vtkm::cont::DynamicCellSetBase<CellSetList> dynamicCellSet)
{
  VTKM_TEST_ASSERT(dynamicCellSet.IsType(cellSet),
                   "DynamicCellSet reports wrong type.");
  VTKM_TEST_ASSERT(!dynamicCellSet.IsType(vtkm::Id()),
                   "DynamicCellSet reports wrong type.");

  dynamicCellSet.CastTo(cellSet);

  CheckCalled = false;
  dynamicCellSet.CastAndCall(CheckFunctor<CellSetType>());

  VTKM_TEST_ASSERT(CheckCalled,
                   "The functor was never called (and apparently a bad value exception not thrown).");
}

template<typename CellSetType, typename CellSetList>
void TryNewInstance(
    CellSetType, vtkm::cont::DynamicCellSetBase<CellSetList> &originalCellSet)
{
  vtkm::cont::DynamicCellSetBase<CellSetList> newCellSet =
      originalCellSet.NewInstance();

  VTKM_TEST_ASSERT(newCellSet.IsType(CellSetType()),
                   "New cell set wrong type.");

  VTKM_TEST_ASSERT(&originalCellSet.CastTo(CellSetType())
                   != &newCellSet.CastTo(CellSetType()),
                   "NewInstance did not make a copy.");
}

template<typename CellSetType, typename CellSetList>
void TryCellSet(CellSetType cellSet,
                vtkm::cont::DynamicCellSetBase<CellSetList> &dynamicCellSet)
{
  CheckDynamicCellSet(cellSet, dynamicCellSet);

  CheckDynamicCellSet(
        cellSet,
        dynamicCellSet.ResetCellSetList(vtkm::ListTagBase<CellSetType>()));

  TryNewInstance(cellSet, dynamicCellSet);
}

template<typename CellSetType>
void TryDefaultCellSet(CellSetType cellSet)
{
  vtkm::cont::DynamicCellSet dynamicCellSet(cellSet);

  TryCellSet(cellSet, dynamicCellSet);
}

template<typename CellSetType>
void TryNonDefaultCellSet(CellSetType cellSet)
{
  vtkm::cont::DynamicCellSetBase<NonDefaultCellSetList> dynamicCellSet(cellSet);

  TryCellSet(cellSet, dynamicCellSet);
}

void TestDynamicCellSet()
{
  std::cout << "Try default types with default type lists." << std::endl;
  std::cout << "*** 2D Structured Grid ******************" << std::endl;
  TryDefaultCellSet(vtkm::cont::CellSetStructured<2>());
  std::cout << "*** 3D Structured Grid ******************" << std::endl;
  TryDefaultCellSet(vtkm::cont::CellSetStructured<3>());
  std::cout << "*** Explicit Grid ***********************" << std::endl;
  TryDefaultCellSet(vtkm::cont::CellSetExplicit<>());

  std::cout << std::endl << "Try non-default types." << std::endl;
  std::cout << "*** 1D Structured Grid ******************" << std::endl;
  TryNonDefaultCellSet(vtkm::cont::CellSetStructured<1>());
  std::cout << "*** Explicit Grid Constant Shape ********" << std::endl;
  TryNonDefaultCellSet(vtkm::cont::CellSetExplicit<
                       vtkm::cont::ArrayHandleConstant<vtkm::Id>::StorageTag>());
}

} // anonymous namespace

int UnitTestDynamicCellSet(int, char *[])
{
  return vtkm::cont::testing::Testing::Run(TestDynamicCellSet);
}