//============================================================================
//  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 <vtkm/cont/ArrayCopy.h>
#include <vtkm/cont/DataSetBuilderUniform.h>
#include <vtkm/cont/testing/Testing.h>

#include <vtkm/filter/clean_grid/CleanGrid.h>
#include <vtkm/filter/resampling/Probe.h>

namespace
{

vtkm::cont::DataSet MakeInputDataSet()
{
  std::vector<vtkm::Float32> pvec(16), cvec(9);
  for (std::size_t i = 0; i < 16; ++i)
  {
    pvec[i] = static_cast<vtkm::Float32>(i) * 0.3f;
  }
  for (std::size_t i = 0; i < 9; ++i)
  {
    cvec[i] = static_cast<vtkm::Float32>(i) * 0.7f;
  }

  auto input = vtkm::cont::DataSetBuilderUniform::Create(
    vtkm::Id2(4, 4), vtkm::make_Vec(0.0f, 0.0f), vtkm::make_Vec(1.0f, 1.0f));
  input.AddPointField("pointdata", pvec);
  input.AddCellField("celldata", cvec);
  return input;
}

vtkm::cont::DataSet MakeGeometryDataSet()
{
  auto geometry = vtkm::cont::DataSetBuilderUniform::Create(
    vtkm::Id2(9, 9), vtkm::make_Vec(0.7f, 0.7f), vtkm::make_Vec(0.35f, 0.35f));
  return geometry;
}

vtkm::cont::DataSet ConvertDataSetUniformToExplicit(const vtkm::cont::DataSet& uds)
{
  vtkm::filter::clean_grid::CleanGrid toUnstructured;
  toUnstructured.SetMergePoints(true);
  return toUnstructured.Execute(uds);
}

const std::vector<vtkm::Float32>& GetExpectedPointData()
{
  static std::vector<vtkm::Float32> expected = {
    1.05f,         1.155f,        1.26f,         1.365f,        1.47f,         1.575f,
    1.68f,         vtkm::Nan32(), vtkm::Nan32(), 1.47f,         1.575f,        1.68f,
    1.785f,        1.89f,         1.995f,        2.1f,          vtkm::Nan32(), vtkm::Nan32(),
    1.89f,         1.995f,        2.1f,          2.205f,        2.31f,         2.415f,
    2.52f,         vtkm::Nan32(), vtkm::Nan32(), 2.31f,         2.415f,        2.52f,
    2.625f,        2.73f,         2.835f,        2.94f,         vtkm::Nan32(), vtkm::Nan32(),
    2.73f,         2.835f,        2.94f,         3.045f,        3.15f,         3.255f,
    3.36f,         vtkm::Nan32(), vtkm::Nan32(), 3.15f,         3.255f,        3.36f,
    3.465f,        3.57f,         3.675f,        3.78f,         vtkm::Nan32(), vtkm::Nan32(),
    3.57f,         3.675f,        3.78f,         3.885f,        3.99f,         4.095f,
    4.2f,          vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(),
    vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(),
    vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(),
    vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32()
  };
  return expected;
}

const std::vector<vtkm::Float32>& GetExpectedCellData()
{
  static std::vector<vtkm::Float32> expected = {
    0.0f,          0.7f,          0.7f,          0.7f,          1.4f,          1.4f,
    1.4f,          vtkm::Nan32(), vtkm::Nan32(), 2.1f,          2.8f,          2.8f,
    2.8f,          3.5f,          3.5f,          3.5f,          vtkm::Nan32(), vtkm::Nan32(),
    2.1f,          2.8f,          2.8f,          2.8f,          3.5f,          3.5f,
    3.5f,          vtkm::Nan32(), vtkm::Nan32(), 2.1f,          2.8f,          2.8f,
    2.8f,          3.5f,          3.5f,          3.5f,          vtkm::Nan32(), vtkm::Nan32(),
    4.2f,          4.9f,          4.9f,          4.9f,          5.6f,          5.6f,
    5.6f,          vtkm::Nan32(), vtkm::Nan32(), 4.2f,          4.9f,          4.9f,
    4.9f,          5.6f,          5.6f,          5.6f,          vtkm::Nan32(), vtkm::Nan32(),
    4.2f,          4.9f,          4.9f,          4.9f,          5.6f,          5.6f,
    5.6f,          vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(),
    vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(),
    vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32(),
    vtkm::Nan32(), vtkm::Nan32(), vtkm::Nan32()
  };
  return expected;
}

const std::vector<vtkm::UInt8>& GetExpectedHiddenPoints()
{
  static std::vector<vtkm::UInt8> expected = { 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 2,
                                               2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0,
                                               2, 2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0,
                                               0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2,
                                               2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 };
  return expected;
}

const std::vector<vtkm::UInt8>& GetExpectedHiddenCells()
{
  static std::vector<vtkm::UInt8> expected = { 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 2, 2,
                                               0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 2, 2,
                                               0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 2, 2,
                                               2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 };
  return expected;
}

template <typename T>
void TestResultArray(const vtkm::cont::ArrayHandle<T>& result, const std::vector<T>& expected)
{
  VTKM_TEST_ASSERT(result.GetNumberOfValues() == static_cast<vtkm::Id>(expected.size()),
                   "Incorrect field size");

  auto portal = result.ReadPortal();
  vtkm::Id size = portal.GetNumberOfValues();
  for (vtkm::Id i = 0; i < size; ++i)
  {
    VTKM_TEST_ASSERT(test_equal(portal.Get(i), expected[static_cast<std::size_t>(i)]),
                     "Incorrect field value");
  }
}

class TestProbe
{
private:
  using FieldArrayType = vtkm::cont::ArrayHandle<vtkm::Float32>;
  using HiddenArrayType = vtkm::cont::ArrayHandle<vtkm::UInt8>;

  static void ExplicitToUnifrom()
  {
    std::cout << "Testing Probe Explicit to Uniform:\n";

    auto input = ConvertDataSetUniformToExplicit(MakeInputDataSet());
    auto geometry = MakeGeometryDataSet();

    vtkm::filter::resampling::Probe probe;
    probe.SetGeometry(geometry);
    probe.SetFieldsToPass({ "pointdata", "celldata" });
    auto output = probe.Execute(input);

    TestResultArray(vtkm::cont::Cast<FieldArrayType>(output.GetField("pointdata").GetData()),
                    GetExpectedPointData());
    TestResultArray(vtkm::cont::Cast<FieldArrayType>(output.GetField("celldata").GetData()),
                    GetExpectedCellData());
    TestResultArray(vtkm::cont::Cast<HiddenArrayType>(output.GetPointField("HIDDEN").GetData()),
                    GetExpectedHiddenPoints());
    TestResultArray(vtkm::cont::Cast<HiddenArrayType>(output.GetCellField("HIDDEN").GetData()),
                    GetExpectedHiddenCells());
  }

  static void UniformToExplict()
  {
    std::cout << "Testing Probe Uniform to Explicit:\n";

    auto input = MakeInputDataSet();
    auto geometry = ConvertDataSetUniformToExplicit(MakeGeometryDataSet());

    vtkm::filter::resampling::Probe probe;
    probe.SetGeometry(geometry);
    probe.SetFieldsToPass({ "pointdata", "celldata" });
    auto output = probe.Execute(input);

    TestResultArray(vtkm::cont::Cast<FieldArrayType>(output.GetField("pointdata").GetData()),
                    GetExpectedPointData());
    TestResultArray(vtkm::cont::Cast<FieldArrayType>(output.GetField("celldata").GetData()),
                    GetExpectedCellData());
    TestResultArray(vtkm::cont::Cast<HiddenArrayType>(output.GetPointField("HIDDEN").GetData()),
                    GetExpectedHiddenPoints());
    TestResultArray(vtkm::cont::Cast<HiddenArrayType>(output.GetCellField("HIDDEN").GetData()),
                    GetExpectedHiddenCells());
  }

  static void ExplicitToExplict()
  {
    std::cout << "Testing Probe Explicit to Explicit:\n";

    auto input = ConvertDataSetUniformToExplicit(MakeInputDataSet());
    auto geometry = ConvertDataSetUniformToExplicit(MakeGeometryDataSet());

    vtkm::filter::resampling::Probe probe;
    probe.SetGeometry(geometry);
    probe.SetFieldsToPass({ "pointdata", "celldata" });
    auto output = probe.Execute(input);

    TestResultArray(vtkm::cont::Cast<FieldArrayType>(output.GetField("pointdata").GetData()),
                    GetExpectedPointData());
    TestResultArray(vtkm::cont::Cast<FieldArrayType>(output.GetField("celldata").GetData()),
                    GetExpectedCellData());
    TestResultArray(vtkm::cont::Cast<HiddenArrayType>(output.GetPointField("HIDDEN").GetData()),
                    GetExpectedHiddenPoints());
    TestResultArray(vtkm::cont::Cast<HiddenArrayType>(output.GetCellField("HIDDEN").GetData()),
                    GetExpectedHiddenCells());
  }

public:
  static void Run()
  {
    ExplicitToUnifrom();
    UniformToExplict();
    ExplicitToExplict();
  }
};

} // anonymous namespace

int UnitTestProbe(int argc, char* argv[])
{
  return vtkm::cont::testing::Testing::Run(TestProbe::Run, argc, argv);
}
