/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#pragma once

#include <thrust/detail/config.h>
#include <thrust/system/detail/generic/transform.h>
#include <thrust/for_each.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/iterator/detail/minimum_system.h>
#include <thrust/tuple.h>
#include <thrust/iterator/zip_iterator.h>
#include <thrust/detail/internal_functional.h>

THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{


template<typename DerivedPolicy,
         typename InputIterator,
         typename OutputIterator,
         typename UnaryFunction>
THRUST_HOST_DEVICE
  OutputIterator transform(thrust::execution_policy<DerivedPolicy> &exec,
                           InputIterator first,
                           InputIterator last,
                           OutputIterator result,
                           UnaryFunction op)
{
  using UnaryTransformFunctor = thrust::detail::unary_transform_functor<UnaryFunction>;

  // make an iterator tuple
  using IteratorTuple = thrust::tuple<InputIterator, OutputIterator>;
  using ZipIterator   = thrust::zip_iterator<IteratorTuple>;

  ZipIterator zipped_result =
    thrust::for_each(exec,
                     thrust::make_zip_iterator(thrust::make_tuple(first,result)),
                     thrust::make_zip_iterator(thrust::make_tuple(last,result)),
                     UnaryTransformFunctor(op));

  return thrust::get<1>(zipped_result.get_iterator_tuple());
} // end transform()


template<typename DerivedPolicy,
         typename InputIterator1,
         typename InputIterator2,
         typename OutputIterator,
         typename BinaryFunction>
THRUST_HOST_DEVICE
  OutputIterator transform(thrust::execution_policy<DerivedPolicy> &exec,
                           InputIterator1 first1,
                           InputIterator1 last1,
                           InputIterator2 first2,
                           OutputIterator result,
                           BinaryFunction op)
{
  // given the minimal system, determine the binary transform functor we need
  using BinaryTransformFunctor = thrust::detail::binary_transform_functor<BinaryFunction>;

  // make an iterator tuple
  using IteratorTuple = thrust::tuple<InputIterator1, InputIterator2, OutputIterator>;
  using ZipIterator   = thrust::zip_iterator<IteratorTuple>;

  ZipIterator zipped_result =
    thrust::for_each(exec,
                     thrust::make_zip_iterator(thrust::make_tuple(first1,first2,result)),
                     thrust::make_zip_iterator(thrust::make_tuple(last1,first2,result)),
                     BinaryTransformFunctor(op));

  return thrust::get<2>(zipped_result.get_iterator_tuple());
} // end transform()


template<typename DerivedPolicy,
         typename InputIterator,
         typename ForwardIterator,
         typename UnaryFunction,
         typename Predicate>
THRUST_HOST_DEVICE
  ForwardIterator transform_if(thrust::execution_policy<DerivedPolicy> &exec,
                               InputIterator first,
                               InputIterator last,
                               ForwardIterator result,
                               UnaryFunction unary_op,
                               Predicate pred)
{
  using UnaryTransformIfFunctor = thrust::detail::unary_transform_if_functor<UnaryFunction, Predicate>;

  // make an iterator tuple
  using IteratorTuple = thrust::tuple<InputIterator, ForwardIterator>;
  using ZipIterator   = thrust::zip_iterator<IteratorTuple>;

  ZipIterator zipped_result =
    thrust::for_each(exec,
                     thrust::make_zip_iterator(thrust::make_tuple(first,result)),
                     thrust::make_zip_iterator(thrust::make_tuple(last,result)),
                     UnaryTransformIfFunctor(unary_op,pred));

  return thrust::get<1>(zipped_result.get_iterator_tuple());
} // end transform_if()


template<typename DerivedPolicy,
         typename InputIterator1,
         typename InputIterator2,
         typename ForwardIterator,
         typename UnaryFunction,
         typename Predicate>
THRUST_HOST_DEVICE
  ForwardIterator transform_if(thrust::execution_policy<DerivedPolicy> &exec,
                               InputIterator1 first,
                               InputIterator1 last,
                               InputIterator2 stencil,
                               ForwardIterator result,
                               UnaryFunction unary_op,
                               Predicate pred)
{
  using UnaryTransformIfFunctor = thrust::detail::unary_transform_if_with_stencil_functor<UnaryFunction, Predicate>;

  // make an iterator tuple
  using IteratorTuple = thrust::tuple<InputIterator1, InputIterator2, ForwardIterator>;
  using ZipIterator   = thrust::zip_iterator<IteratorTuple>;

  ZipIterator zipped_result =
    thrust::for_each(exec,
                     thrust::make_zip_iterator(thrust::make_tuple(first,stencil,result)),
                     thrust::make_zip_iterator(thrust::make_tuple(last,stencil,result)),
                     UnaryTransformIfFunctor(unary_op,pred));

  return thrust::get<2>(zipped_result.get_iterator_tuple());
} // end transform_if()


template<typename DerivedPolicy,
         typename InputIterator1,
         typename InputIterator2,
         typename InputIterator3,
         typename ForwardIterator,
         typename BinaryFunction,
         typename Predicate>
THRUST_HOST_DEVICE
  ForwardIterator transform_if(thrust::execution_policy<DerivedPolicy> &exec,
                               InputIterator1 first1,
                               InputIterator1 last1,
                               InputIterator2 first2,
                               InputIterator3 stencil,
                               ForwardIterator result,
                               BinaryFunction binary_op,
                               Predicate pred)
{
  using BinaryTransformIfFunctor = thrust::detail::binary_transform_if_functor<BinaryFunction, Predicate>;

  // make an iterator tuple
  using IteratorTuple = thrust::tuple<InputIterator1, InputIterator2, InputIterator3, ForwardIterator>;
  using ZipIterator   = thrust::zip_iterator<IteratorTuple>;

  ZipIterator zipped_result =
    thrust::for_each(exec,
                     thrust::make_zip_iterator(thrust::make_tuple(first1,first2,stencil,result)),
                     thrust::make_zip_iterator(thrust::make_tuple(last1,first2,stencil,result)),
                     BinaryTransformIfFunctor(binary_op,pred));

  return thrust::get<3>(zipped_result.get_iterator_tuple());
} // end transform_if()


} // end generic
} // end detail
} // end system
THRUST_NAMESPACE_END
