// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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

// IWYU pragma: begin_exports

#include <memory>
#include <string>
#include <vector>

#include <gmock/gmock.h>

#include "arrow/array.h"
#include "arrow/datum.h"
#include "arrow/memory_pool.h"
#include "arrow/pretty_print.h"
#include "arrow/testing/gtest_util.h"
#include "arrow/testing/random.h"
#include "arrow/testing/util.h"
#include "arrow/type.h"

#include "arrow/compute/kernel.h"

// IWYU pragma: end_exports

namespace arrow {

using internal::checked_cast;

namespace compute {

template <typename Type, typename T>
std::shared_ptr<Array> _MakeArray(const std::shared_ptr<DataType>& type,
                                  const std::vector<T>& values,
                                  const std::vector<bool>& is_valid) {
  std::shared_ptr<Array> result;
  if (is_valid.size() > 0) {
    ArrayFromVector<Type, T>(type, is_valid, values, &result);
  } else {
    ArrayFromVector<Type, T>(type, values, &result);
  }
  return result;
}

template <typename Type, typename Enable = void>
struct DatumEqual {};

template <typename Type>
struct DatumEqual<Type, enable_if_floating_point<Type>> {
  static constexpr double kArbitraryDoubleErrorBound = 1.0;
  using ScalarType = typename TypeTraits<Type>::ScalarType;

  static void EnsureEqual(const Datum& lhs, const Datum& rhs) {
    ASSERT_EQ(lhs.kind(), rhs.kind());
    if (lhs.kind() == Datum::SCALAR) {
      auto left = checked_cast<const ScalarType*>(lhs.scalar().get());
      auto right = checked_cast<const ScalarType*>(rhs.scalar().get());
      ASSERT_EQ(left->is_valid, right->is_valid);
      ASSERT_EQ(left->type->id(), right->type->id());
      ASSERT_NEAR(left->value, right->value, kArbitraryDoubleErrorBound);
    }
  }
};

template <typename Type>
struct DatumEqual<Type, enable_if_integer<Type>> {
  using ScalarType = typename TypeTraits<Type>::ScalarType;
  static void EnsureEqual(const Datum& lhs, const Datum& rhs) {
    ASSERT_EQ(lhs.kind(), rhs.kind());
    if (lhs.kind() == Datum::SCALAR) {
      auto left = checked_cast<const ScalarType*>(lhs.scalar().get());
      auto right = checked_cast<const ScalarType*>(rhs.scalar().get());
      ASSERT_EQ(*left, *right);
    }
  }
};

void CheckScalarUnary(std::string func_name, std::shared_ptr<DataType> in_ty,
                      std::string json_input, std::shared_ptr<DataType> out_ty,
                      std::string json_expected,
                      const FunctionOptions* options = nullptr);

void CheckScalarUnary(std::string func_name, std::shared_ptr<Array> input,
                      std::shared_ptr<Array> expected,
                      const FunctionOptions* options = nullptr);

void CheckScalarUnary(std::string func_name, std::shared_ptr<Scalar> input,
                      std::shared_ptr<Scalar> expected,
                      const FunctionOptions* options = nullptr);

void CheckScalarBinary(std::string func_name, std::shared_ptr<Scalar> left_input,
                       std::shared_ptr<Scalar> right_input,
                       std::shared_ptr<Scalar> expected,
                       const FunctionOptions* options = nullptr);

void CheckScalarBinary(std::string func_name, std::shared_ptr<Array> left_input,
                       std::shared_ptr<Array> right_input,
                       std::shared_ptr<Array> expected,
                       const FunctionOptions* options = nullptr);

void CheckVectorUnary(std::string func_name, Datum input, std::shared_ptr<Array> expected,
                      const FunctionOptions* options = nullptr);

using BinaryTypes =
    ::testing::Types<BinaryType, LargeBinaryType, StringType, LargeStringType>;
using StringTypes = ::testing::Types<StringType, LargeStringType>;

static constexpr random::SeedType kRandomSeed = 0x0ff1ce;

template <template <typename> class DoTestFunctor>
void TestRandomPrimitiveCTypes() {
  DoTestFunctor<Int8Type>::Test(int8());
  DoTestFunctor<Int16Type>::Test(int16());
  DoTestFunctor<Int32Type>::Test(int32());
  DoTestFunctor<Int64Type>::Test(int64());
  DoTestFunctor<UInt8Type>::Test(uint8());
  DoTestFunctor<UInt16Type>::Test(uint16());
  DoTestFunctor<UInt32Type>::Test(uint32());
  DoTestFunctor<UInt64Type>::Test(uint64());
  DoTestFunctor<FloatType>::Test(float32());
  DoTestFunctor<DoubleType>::Test(float64());
  DoTestFunctor<Date32Type>::Test(date32());
  DoTestFunctor<Date64Type>::Test(date64());
  DoTestFunctor<Time32Type>::Test(time32(TimeUnit::SECOND));
  DoTestFunctor<Time64Type>::Test(time64(TimeUnit::MICRO));
  DoTestFunctor<TimestampType>::Test(timestamp(TimeUnit::SECOND));
  DoTestFunctor<TimestampType>::Test(timestamp(TimeUnit::MICRO));
  DoTestFunctor<DurationType>::Test(duration(TimeUnit::MILLI));
}

// Check that DispatchBest on a given function yields the same Kernel as
// produced by DispatchExact on another set of ValueDescrs.
void CheckDispatchBest(std::string func_name, std::vector<ValueDescr> descrs,
                       std::vector<ValueDescr> exact_descrs);

}  // namespace compute
}  // namespace arrow
