//============================================================================
//  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 2014 Sandia Corporation.
//  Copyright 2014 UT-Battelle, LLC.
//  Copyright 2014 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_cont_Field_h
#define vtk_m_cont_Field_h

#include <vtkm/cont/vtkm_cont_export.h>

#include <vtkm/Range.h>
#include <vtkm/Types.h>

#include <vtkm/cont/ArrayHandle.h>
#include <vtkm/cont/ArrayPortalToIterators.h>
#include <vtkm/cont/ArrayRangeCompute.h>
#include <vtkm/cont/DynamicArrayHandle.h>

namespace vtkm {
namespace cont {

namespace internal {

class ComputeRange
{
public:
  ComputeRange(ArrayHandle<vtkm::Range>& range) : Range(&range) {}

  template<typename ArrayHandleType>
  void operator()(const ArrayHandleType &input) const
  {
    *this->Range = vtkm::cont::ArrayRangeCompute(input);
  }

private:
    vtkm::cont::ArrayHandle<vtkm::Range> *Range;
};

} // namespace internal


/// A \c Field encapsulates an array on some piece of the mesh, such as
/// the points, a cell set, a point logical dimension, or the whole mesh.
///
class VTKM_CONT_EXPORT Field
{
public:

  enum AssociationEnum
  {
    ASSOC_ANY,
    ASSOC_WHOLE_MESH,
    ASSOC_POINTS,
    ASSOC_CELL_SET,
    ASSOC_LOGICAL_DIM
  };

  /// constructors for points / whole mesh
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const vtkm::cont::DynamicArrayHandle &data)
    : Name(name),
      Association(association),
      AssocCellSetName(),
      AssocLogicalDim(-1),
      Data(data),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_WHOLE_MESH ||
                this->Association == ASSOC_POINTS);
  }

  template<typename T, typename Storage>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const ArrayHandle<T, Storage> &data)
    : Name(name),
      Association(association),
      AssocCellSetName(),
      AssocLogicalDim(-1),
      Data(data),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT((this->Association == ASSOC_WHOLE_MESH) ||
                (this->Association == ASSOC_POINTS));
  }

  template <typename T>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const std::vector<T> &data)
    : Name(name),
      Association(association),
      AssocCellSetName(),
      AssocLogicalDim(-1),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT((this->Association == ASSOC_WHOLE_MESH) ||
                (this->Association == ASSOC_POINTS));
    this->CopyData(&data[0], static_cast<vtkm::Id>(data.size()));
  }

  template <typename T>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const T *data,
        vtkm::Id nvals)
    : Name(name),
      Association(association),
      AssocCellSetName(),
      AssocLogicalDim(-1),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT((this->Association == ASSOC_WHOLE_MESH) ||
                (this->Association == ASSOC_POINTS));
    this->CopyData(data, nvals);
  }

  /// constructors for cell set associations
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const std::string& cellSetName,
        const vtkm::cont::DynamicArrayHandle &data)
    : Name(name),
      Association(association),
      AssocCellSetName(cellSetName),
      AssocLogicalDim(-1),
      Data(data),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_CELL_SET);
  }

  template <typename T, typename Storage>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const std::string& cellSetName,
        const vtkm::cont::ArrayHandle<T, Storage> &data)
    : Name(name),
      Association(association),
      AssocCellSetName(cellSetName),
      AssocLogicalDim(-1),
      Data(data),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_CELL_SET);
  }

  template <typename T>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const std::string& cellSetName,
        const std::vector<T> &data)
    : Name(name),
      Association(association),
      AssocCellSetName(cellSetName),
      AssocLogicalDim(-1),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_CELL_SET);
    this->CopyData(&data[0], static_cast<vtkm::Id>(data.size()));
  }

  template <typename T>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        const std::string& cellSetName,
        const T *data,
        vtkm::Id nvals)
    : Name(name),
      Association(association),
      AssocCellSetName(cellSetName),
      AssocLogicalDim(-1),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_CELL_SET);
    this->CopyData(data, nvals);
  }

  /// constructors for logical dimension associations
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        vtkm::IdComponent logicalDim,
        const vtkm::cont::DynamicArrayHandle &data)
    : Name(name),
      Association(association),
      AssocCellSetName(),
      AssocLogicalDim(logicalDim),
      Data(data),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_LOGICAL_DIM);
  }

  template <typename T, typename Storage>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        vtkm::IdComponent logicalDim,
        const vtkm::cont::ArrayHandle<T, Storage> &data)
    : Name(name),
      Association(association),
      AssocLogicalDim(logicalDim),
      Data(data),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_LOGICAL_DIM);
  }

  template <typename T>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        vtkm::IdComponent logicalDim,
        const std::vector<T> &data)
    : Name(name),
      Association(association),
      AssocLogicalDim(logicalDim),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_LOGICAL_DIM);
    this->CopyData(&data[0], static_cast<vtkm::Id>(data.size()));
  }

  template <typename T>
  VTKM_CONT
  Field(std::string name,
        AssociationEnum association,
        vtkm::IdComponent logicalDim,
        const T *data, vtkm::Id nvals)
    : Name(name),
      Association(association),
      AssocLogicalDim(logicalDim),
      Range(),
      ModifiedFlag(true)
  {
    VTKM_ASSERT(this->Association == ASSOC_LOGICAL_DIM);
    CopyData(data, nvals);
  }

  VTKM_CONT
  Field()
    : Name(),
      Association(ASSOC_ANY),
      AssocCellSetName(),
      AssocLogicalDim(),
      Data(),
      Range(),
      ModifiedFlag(true)
  {
    //Generate an empty field
  }

  VTKM_CONT
  Field &operator=(const vtkm::cont::Field &src) = default;

  VTKM_CONT
  const std::string &GetName() const
  {
    return this->Name;
  }

  VTKM_CONT
  AssociationEnum GetAssociation() const
  {
    return this->Association;
  }

  VTKM_CONT
  std::string GetAssocCellSet() const
  {
    return this->AssocCellSetName;
  }

  VTKM_CONT
  vtkm::IdComponent GetAssocLogicalDim() const
  {
    return this->AssocLogicalDim;
  }

  template<typename TypeList, typename StorageList>
  VTKM_CONT
  const vtkm::cont::ArrayHandle<vtkm::Range>&
  GetRange(TypeList, StorageList) const
  {
    VTKM_IS_LIST_TAG(TypeList);
    VTKM_IS_LIST_TAG(StorageList);

    return this->GetRangeImpl(TypeList(), StorageList());
  }

  VTKM_CONT
  const vtkm::cont::ArrayHandle<vtkm::Range>&
  GetRange(VTKM_DEFAULT_TYPE_LIST_TAG, VTKM_DEFAULT_STORAGE_LIST_TAG) const;

  template<typename TypeList, typename StorageList>
  VTKM_CONT
  void GetRange(vtkm::Range *range,
                TypeList,
                StorageList) const
  {
    VTKM_IS_LIST_TAG(TypeList);
    VTKM_IS_LIST_TAG(StorageList);

    this->GetRange(TypeList(), StorageList());

    vtkm::Id length = this->Range.GetNumberOfValues();
    for (vtkm::Id i = 0; i < length; ++i)
    {
      range[i] = this->Range.GetPortalConstControl().Get(i);
    }
  }

  template<typename TypeList>
  VTKM_CONT
  const vtkm::cont::ArrayHandle<vtkm::Range>& GetRange(TypeList) const
  {
    VTKM_IS_LIST_TAG(TypeList);

    return this->GetRange(TypeList(),
                          VTKM_DEFAULT_STORAGE_LIST_TAG());
  }

  template<typename TypeList>
  VTKM_CONT
  void GetRange(vtkm::Range *range, TypeList) const
  {
    VTKM_IS_LIST_TAG(TypeList);

    this->GetRange(range,
                   TypeList(),
                   VTKM_DEFAULT_STORAGE_LIST_TAG());
  }

  VTKM_CONT
  const vtkm::cont::ArrayHandle<vtkm::Range>& GetRange() const;

  VTKM_CONT
  void GetRange(vtkm::Range *range) const;

  const vtkm::cont::DynamicArrayHandle &GetData() const;

  vtkm::cont::DynamicArrayHandle &GetData();


  template <typename T>
  VTKM_CONT
  void SetData(const vtkm::cont::ArrayHandle<T> &newdata)
  {
    this->Data = newdata;
    this->ModifiedFlag = true;
  }

  VTKM_CONT
  void SetData(const vtkm::cont::DynamicArrayHandle &newdata)
  {
    this->Data = newdata;
    this->ModifiedFlag = true;
  }

  template <typename T>
  VTKM_CONT
  void CopyData(const T *ptr, vtkm::Id nvals)
  {
    //allocate main memory using an array handle
    vtkm::cont::ArrayHandle<T> tmp;
    tmp.Allocate(nvals);

    //copy into the memory owned by the array handle
    std::copy(ptr,
              ptr + static_cast<std::size_t>(nvals),
              vtkm::cont::ArrayPortalToIteratorBegin(tmp.GetPortalControl()));

    //assign to the dynamic array handle
    this->Data = tmp;
    this->ModifiedFlag = true;
  }

  VTKM_CONT
  virtual void PrintSummary(std::ostream &out) const;

private:
  std::string       Name;  ///< name of field

  AssociationEnum   Association;
  std::string       AssocCellSetName;  ///< only populate if assoc is cells
  vtkm::IdComponent AssocLogicalDim; ///< only populate if assoc is logical dim

  vtkm::cont::DynamicArrayHandle Data;
  mutable vtkm::cont::ArrayHandle<vtkm::Range> Range;
  mutable bool ModifiedFlag;

  template<typename TypeList, typename StorageList>
  VTKM_CONT
  const vtkm::cont::ArrayHandle<vtkm::Range>&
  GetRangeImpl(TypeList, StorageList) const
  {
    VTKM_IS_LIST_TAG(TypeList);
    VTKM_IS_LIST_TAG(StorageList);

    if (this->ModifiedFlag)
    {
      internal::ComputeRange computeRange(this->Range);
      this->Data.ResetTypeAndStorageLists(TypeList(),StorageList()).CastAndCall(computeRange);
      this->ModifiedFlag = false;
    }

    return this->Range;
  }
};

template<typename Functor>
void CastAndCall(const vtkm::cont::Field& field, const Functor &f)
{
  field.GetData().CastAndCall(f);
}

namespace internal {
template<>
struct DynamicTransformTraits<vtkm::cont::Field>
{
  typedef vtkm::cont::internal::DynamicTransformTagCastAndCall DynamicTag;
};


} // namespace internal
} // namespace cont
} // namespace vtkm

#endif //vtk_m_cont_Field_h