//============================================================================
//  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 2016 Sandia Corporation.
//  Copyright 2016 UT-Battelle, LLC.
//  Copyright 2016 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.
//============================================================================
#ifndef vtk_m_filter_internal_ResolveFieldTypeAndExecute_h
#define vtk_m_filter_internal_ResolveFieldTypeAndExecute_h

#include <vtkm/cont/DataSet.h>
#include <vtkm/cont/TryExecute.h>
#include <vtkm/cont/internal/DeviceAdapterTag.h>
#include <vtkm/cont/internal/RuntimeDeviceTracker.h>

#include <vtkm/filter/FieldMetadata.h>
#include <vtkm/filter/PolicyBase.h>

namespace vtkm {
namespace filter {
namespace internal {

template<typename Derived, typename DerivedPolicy, typename ResultType>
struct ResolveFieldTypeAndExecute
{
  typedef ResolveFieldTypeAndExecute<Derived, DerivedPolicy, ResultType> Self;

  Derived* DerivedClass;
  const vtkm::cont::DataSet &InputData;
  const vtkm::filter::FieldMetadata& Metadata;
  const vtkm::filter::PolicyBase<DerivedPolicy>& Policy;
  vtkm::cont::internal::RuntimeDeviceTracker& Tracker;
  ResultType& Result;

  ResolveFieldTypeAndExecute(
      Derived* derivedClass,
      const vtkm::cont::DataSet &inputData,
      const vtkm::filter::FieldMetadata& fieldMeta,
      const vtkm::filter::PolicyBase<DerivedPolicy>& policy,
      vtkm::cont::internal::RuntimeDeviceTracker& tracker,
      ResultType& result):
    DerivedClass(derivedClass),
    InputData(inputData),
    Metadata(fieldMeta),
    Policy(policy),
    Tracker(tracker),
    Result(result)
  {

  }

private:

  template<typename T, typename StorageTag>
  struct ResolveFieldTypeAndExecuteForDevice
  {
    typedef vtkm::cont::ArrayHandle<T,StorageTag> FieldArrayHandle;
    ResolveFieldTypeAndExecuteForDevice(const Self& instance,
                                        const FieldArrayHandle& field) :
      Instance(instance), Field(field) {}

    const Self& Instance;
    const vtkm::cont::ArrayHandle<T,StorageTag>& Field;

    template <typename DeviceAdapterTag>
    bool operator()(DeviceAdapterTag tag) const
    {
      this->Instance.Result =
          this->Instance.DerivedClass->DoExecute(this->Instance.InputData,
                                                 this->Field,
                                                 this->Instance.Metadata,
                                                 this->Instance.Policy,
                                                 tag );
      return this->Instance.Result.IsValid();
    }

  private:
    // Not implemented
    void operator=(const ResolveFieldTypeAndExecuteForDevice<T,StorageTag>&);
  };

public:

  template<typename T, typename StorageTag>
  void operator()(const vtkm::cont::ArrayHandle<T,StorageTag>& field) const
  {
    ResolveFieldTypeAndExecuteForDevice<T, StorageTag> doResolve(*this,field);
    vtkm::cont::TryExecute(doResolve,
                           this->Tracker,
                           typename DerivedPolicy::DeviceAdapterList());
  }

private:
  // Not implemented
  void operator=(const ResolveFieldTypeAndExecute<Derived,DerivedPolicy,ResultType> &);
};

}
}
}  // namespace vtkm::filter::internal

#endif //vtk_m_filter_internal_ResolveFieldTypeAndExecute_h
