/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.

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.
==============================================================================*/

#include <algorithm>
#include <memory>
#include <string>

#include "tensorflow/compiler/xla/array2d.h"
#include "tensorflow/compiler/xla/client/local_client.h"
#include "tensorflow/compiler/xla/client/xla_client/xla_builder.h"
#include "tensorflow/compiler/xla/client/xla_client/xla_computation.h"
#include "tensorflow/compiler/xla/literal_util.h"
#include "tensorflow/compiler/xla/ptr_util.h"
#include "tensorflow/compiler/xla/reference_util.h"
#include "tensorflow/compiler/xla/shape_util.h"
#include "tensorflow/compiler/xla/statusor.h"
#include "tensorflow/compiler/xla/test_helpers.h"
#include "tensorflow/compiler/xla/tests/client_library_test_base.h"
#include "tensorflow/compiler/xla/tests/literal_test_util.h"
#include "tensorflow/compiler/xla/tests/test_macros.h"
#include "tensorflow/compiler/xla/tests/test_utils.h"
#include "tensorflow/compiler/xla/xla_data.pb.h"
#include "tensorflow/core/lib/strings/stringprintf.h"
#include "tensorflow/core/platform/logging.h"
#include "tensorflow/core/platform/test.h"
#include "tensorflow/core/platform/types.h"

namespace xla {
namespace {

#ifdef XLA_BACKEND_DOES_NOT_SUPPORT_FLOAT16
using TypesF16F32 = ::testing::Types<float>;
#else
using TypesF16F32 = ::testing::Types<Eigen::half, float>;
#endif

class MatOpsSimpleTest : public ClientLibraryTestBase {};

template <typename T>
class MatOpsSimpleTest_F16F32 : public MatOpsSimpleTest {};

TYPED_TEST_CASE(MatOpsSimpleTest_F16F32, TypesF16F32);

XLA_TYPED_TEST(MatOpsSimpleTest_F16F32, ExpTwoByTwoValues) {
  using T = TypeParam;
  XlaBuilder builder("exp_2x2");
  auto data = builder.ConstantR2FromArray2D<T>({
      {1.0f, 0.0f},   // row 0
      {-1.0f, 0.5f},  // row 1
  });
  builder.Exp(data);

  std::unique_ptr<Literal> expected =
      Literal::CreateR2FromArray2D<T>({{2.71828f, 1.00000f},    // row 0
                                       {0.36788f, 1.64872f}});  // row 1

  this->ComputeAndCompareLiteral(&builder, *expected, {}, ErrorSpec(1e-5));
}

XLA_TYPED_TEST(MatOpsSimpleTest_F16F32, MapTwoByTwo) {
  using T = TypeParam;
  XlaComputation add_half;
  {
    // add_half(x) = x + 0.5
    XlaBuilder builder("add_half");
    auto x_value =
        builder.Parameter(0, ShapeUtil::MakeShapeWithType<T>({}), "x_value");
    auto half = builder.ConstantR0<T>(static_cast<T>(0.5));
    builder.Add(x_value, half);
    auto computation_status = builder.Build();
    ASSERT_IS_OK(computation_status.status());
    add_half = computation_status.ConsumeValueOrDie();
  }

  XlaBuilder builder("map_2x2");
  auto data = builder.ConstantR2FromArray2D<T>({
      {1.0f, 0.0f},   // row 0
      {-1.0f, 0.5f},  // row 1
  });
  auto map = builder.Map({data}, add_half, {0, 1});

  std::unique_ptr<Literal> expected =
      Literal::CreateR2FromArray2D<T>({{1.5f, 0.5f},     // row 0
                                       {-0.5f, 1.0f}});  // row 1
  this->ComputeAndCompareLiteral(&builder, *expected, {}, ErrorSpec(1e-5));
}

XLA_TYPED_TEST(MatOpsSimpleTest_F16F32, MaxTwoByTwoValues) {
  using T = TypeParam;
  XlaBuilder builder("max_2x2");
  auto lhs = builder.ConstantR2FromArray2D<T>({
      {7.0f, 2.0f},   // row 0
      {3.0f, -4.0f},  // row 1
  });
  auto rhs = builder.ConstantR2FromArray2D<T>({
      {5.0f, 6.0f},   // row 0
      {1.0f, -8.0f},  // row 1
  });
  auto max = builder.Max(lhs, rhs);

  std::unique_ptr<Literal> expected =
      Literal::CreateR2FromArray2D<T>({{7.0f, 6.0f},     // row 0
                                       {3.0f, -4.0f}});  // row 1
  this->ComputeAndCompareLiteral(&builder, *expected, {}, ErrorSpec(1e-6));
}

struct TestLinspaceMaxParam {
  int64 rows;
  int64 cols;
};

class TestLinspaceMaxParametric
    : public MatOpsSimpleTest,
      public ::testing::WithParamInterface<TestLinspaceMaxParam> {
 public:
  template <typename T>
  void TestImpl() {
    TestLinspaceMaxParam param = GetParam();
    int64 rows = param.rows;
    int64 cols = param.cols;
    float from = -128.0, to = 256.0;
    std::unique_ptr<Array2D<T>> alhs =
        MakeLinspaceArray2D<T>(from, to, rows, cols);
    auto arhs = MakeUnique<Array2D<T>>(rows, cols, static_cast<T>(1.0f));

    XlaBuilder builder(
        tensorflow::strings::Printf("max_%lldx%lld_linspace", rows, cols));
    auto lhs = builder.ConstantR2FromArray2D<T>(*alhs);
    auto rhs = builder.ConstantR2FromArray2D<T>(*arhs);
    auto max = builder.Max(lhs, rhs);

    Array2D<T> expected(rows, cols);
    for (int row = 0; row < rows; ++row) {
      for (int col = 0; col < cols; ++col) {
        expected(row, col) = std::max<T>((*alhs)(row, col), (*arhs)(row, col));
      }
    }
    ErrorSpec error_spec(1e-6);
    if (std::is_same<Eigen::half, T>::value) {
      error_spec = ErrorSpec(1e-6, 2e-4);
    }
    ComputeAndCompareR2<T>(&builder, expected, {}, error_spec);
  }
};

string PrintTestLinspaceMaxParam(
    const ::testing::TestParamInfo<TestLinspaceMaxParam>& test_param) {
  const TestLinspaceMaxParam& param = test_param.param;
  return tensorflow::strings::StrCat(param.rows, "r", param.cols, "c");
}

#ifndef XLA_BACKEND_DOES_NOT_SUPPORT_FLOAT16
XLA_TEST_P(TestLinspaceMaxParametric, TestF16) { TestImpl<Eigen::half>(); }
#endif
XLA_TEST_P(TestLinspaceMaxParametric, TestF32) { TestImpl<float>(); }

INSTANTIATE_TEST_CASE_P(
    TestLinspaceMax, TestLinspaceMaxParametric,
    ::testing::Values(TestLinspaceMaxParam{1, 1}, TestLinspaceMaxParam{2, 2},
                      TestLinspaceMaxParam{3, 3}, TestLinspaceMaxParam{4, 4},
                      TestLinspaceMaxParam{6, 6}, TestLinspaceMaxParam{8, 8},
                      TestLinspaceMaxParam{12, 12},
                      TestLinspaceMaxParam{16, 16}, TestLinspaceMaxParam{32, 8},
                      TestLinspaceMaxParam{64, 8}),
    PrintTestLinspaceMaxParam);

class MatOpsDotAddTest
    : public ClientLibraryTestBase,
      public ::testing::WithParamInterface<std::tuple<bool, bool, bool>> {
 public:
  template <typename T>
  void TestImpl() {
    bool row_major = std::get<0>(GetParam());
    bool add_lhs = std::get<1>(GetParam());
    bool transpose = std::get<2>(GetParam());
    Array2D<T> lhs({{1.0f, 2.0f}, {3.0f, 4.0f}});
    Array2D<T> rhs({{10.0f, 11.0f}, {12.0f, 13.0f}});

    auto minor_to_major = [](bool row_major) -> std::vector<int64> {
      return {row_major ? 1 : 0, row_major ? 0 : 1};
    };

    auto prim_type = primitive_util::NativeToPrimitiveType<T>();
    Shape lhs_shape =
        ShapeUtil::MakeShape(prim_type, {lhs.height(), lhs.width()});
    Shape rhs_shape =
        ShapeUtil::MakeShape(prim_type, {rhs.height(), rhs.width()});

    TF_ASSERT_OK_AND_ASSIGN(
        auto lhs_handle,
        client_->TransferToServer(*Literal::CreateR2FromArray2DWithLayout<T>(
            lhs, LayoutUtil::MakeLayout(minor_to_major(row_major)))));
    TF_ASSERT_OK_AND_ASSIGN(
        auto rhs_handle,
        client_->TransferToServer(*Literal::CreateR2FromArray2DWithLayout<T>(
            rhs, LayoutUtil::MakeLayout(minor_to_major(row_major)))));

    XlaBuilder builder(TestName());
    auto lhs_arg = builder.Parameter(0, lhs_shape, "lhs");
    auto lhs_mat_arg = lhs_arg;
    if (transpose) {
      lhs_mat_arg = builder.Transpose(lhs_mat_arg, {1, 0});
    }
    auto rhs_arg = builder.Parameter(1, rhs_shape, "rhs");
    auto result = builder.Dot(lhs_mat_arg, rhs_arg);
    Array2D<T> expected;
    if (add_lhs) {
      result = builder.Add(result, lhs_arg);
      if (transpose) {
        expected = Array2D<T>({{47.0f, 52.0f}, {71.0f, 78.0f}});
      } else {
        expected = Array2D<T>({{35.0f, 39.0f}, {81.0f, 89.0f}});
      }
    } else {
      result = builder.Add(result, rhs_arg);
      if (transpose) {
        expected = Array2D<T>({{56.0f, 61.0f}, {80.0f, 87.0f}});
      } else {
        expected = Array2D<T>({{44.0f, 48.0f}, {90.0f, 98.0f}});
      }
    }

    ComputeAndCompareR2<T>(&builder, expected,
                           {lhs_handle.get(), rhs_handle.get()},
                           ErrorSpec(1e-6));
  }
};

XLA_TEST_P(MatOpsDotAddTest, Dot_Add_2x2_2x2BF16) { TestImpl<bfloat16>(); }
#ifndef XLA_BACKEND_DOES_NOT_SUPPORT_FLOAT16
XLA_TEST_P(MatOpsDotAddTest, Dot_Add_2x2_2x2F16) { TestImpl<Eigen::half>(); }
#endif
XLA_TEST_P(MatOpsDotAddTest, Dot_Add_2x2_2x2F32) { TestImpl<float>(); }

INSTANTIATE_TEST_CASE_P(MatOpsDotAddTestInstances, MatOpsDotAddTest,
                        ::testing::Combine(::testing::Bool(), ::testing::Bool(),
                                           ::testing::Bool()));

}  // namespace
}  // namespace xla
