/* SPDX-License-Identifier: Apache-2.0 */

#include "testing/testing.h"

#include "BLI_cpp_type.hh"
#include "BLI_cpp_type_make.hh"

namespace blender::tests {

static const int default_constructed_value = 1;
static const int copy_constructed_value = 2;
static const int move_constructed_value = 3;
static const int copy_constructed_from_value = 4;
static const int move_constructed_from_value = 5;
static const int copy_assigned_value = 6;
static const int copy_assigned_from_value = 7;
static const int move_assigned_value = 8;
static const int move_assigned_from_value = 9;
static const int destructed_value = 10;

struct TestType {
  mutable volatile int value;

  TestType()
  {
    value = default_constructed_value;
  }

  ~TestType()
  {
    value = destructed_value;
  }

  TestType(const TestType &other)
  {
    value = copy_constructed_value;
    other.value = copy_constructed_from_value;
  }

  TestType(TestType &&other) noexcept
  {
    value = move_constructed_value;
    other.value = move_constructed_from_value;
  }

  TestType &operator=(const TestType &other)
  {
    value = copy_assigned_value;
    other.value = copy_assigned_from_value;
    return *this;
  }

  TestType &operator=(TestType &&other) noexcept
  {
    value = move_assigned_value;
    other.value = move_assigned_from_value;
    return *this;
  }

  friend std::ostream &operator<<(std::ostream &stream, const TestType &value)
  {
    stream << value.value;
    return stream;
  }

  friend bool operator==(const TestType & /*a*/, const TestType & /*b*/)
  {
    return false;
  }

  uint64_t hash() const
  {
    return 0;
  }
};

}  // namespace blender::tests

BLI_CPP_TYPE_MAKE(TestType, blender::tests::TestType, CPPTypeFlags::BasicType)

namespace blender::tests {

static const CPPType &CPPType_TestType = CPPType::get<TestType>();

TEST(cpp_type, Size)
{
  EXPECT_EQ(CPPType_TestType.size(), sizeof(TestType));
}

TEST(cpp_type, Alignment)
{
  EXPECT_EQ(CPPType_TestType.alignment(), alignof(TestType));
}

TEST(cpp_type, Is)
{
  EXPECT_TRUE(CPPType_TestType.is<TestType>());
  EXPECT_FALSE(CPPType_TestType.is<int>());
}

TEST(cpp_type, DefaultConstruction)
{
  int buffer[10] = {0};
  CPPType_TestType.default_construct((void *)buffer);
  EXPECT_EQ(buffer[0], default_constructed_value);
  EXPECT_EQ(buffer[1], 0);
  CPPType_TestType.default_construct_n((void *)buffer, 3);
  EXPECT_EQ(buffer[0], default_constructed_value);
  EXPECT_EQ(buffer[1], default_constructed_value);
  EXPECT_EQ(buffer[2], default_constructed_value);
  EXPECT_EQ(buffer[3], 0);
  CPPType_TestType.default_construct_indices((void *)buffer, {2, 5, 7});
  EXPECT_EQ(buffer[2], default_constructed_value);
  EXPECT_EQ(buffer[4], 0);
  EXPECT_EQ(buffer[5], default_constructed_value);
  EXPECT_EQ(buffer[6], 0);
  EXPECT_EQ(buffer[7], default_constructed_value);
  EXPECT_EQ(buffer[8], 0);
}

TEST(cpp_type, DefaultConstructTrivial)
{
  int value = 5;
  CPPType::get<int>().default_construct(&value);
  EXPECT_EQ(value, 5);
}

TEST(cpp_type, ValueInitialize)
{
  int buffer[10] = {0};
  CPPType_TestType.value_initialize((void *)buffer);
  EXPECT_EQ(buffer[0], default_constructed_value);
  EXPECT_EQ(buffer[1], 0);
  CPPType_TestType.value_initialize_n((void *)buffer, 3);
  EXPECT_EQ(buffer[0], default_constructed_value);
  EXPECT_EQ(buffer[1], default_constructed_value);
  EXPECT_EQ(buffer[2], default_constructed_value);
  EXPECT_EQ(buffer[3], 0);
  CPPType_TestType.value_initialize_indices((void *)buffer, {2, 5, 7});
  EXPECT_EQ(buffer[2], default_constructed_value);
  EXPECT_EQ(buffer[4], 0);
  EXPECT_EQ(buffer[5], default_constructed_value);
  EXPECT_EQ(buffer[6], 0);
  EXPECT_EQ(buffer[7], default_constructed_value);
  EXPECT_EQ(buffer[8], 0);
}

TEST(cpp_type, ValueInitializeTrivial)
{
  int value = 5;
  CPPType::get<int>().value_initialize(&value);
  EXPECT_EQ(value, 0);
}

TEST(cpp_type, Destruct)
{
  int buffer[10] = {0};
  CPPType_TestType.destruct((void *)buffer);
  EXPECT_EQ(buffer[0], destructed_value);
  EXPECT_EQ(buffer[1], 0);
  CPPType_TestType.destruct_n((void *)buffer, 3);
  EXPECT_EQ(buffer[0], destructed_value);
  EXPECT_EQ(buffer[1], destructed_value);
  EXPECT_EQ(buffer[2], destructed_value);
  EXPECT_EQ(buffer[3], 0);
  CPPType_TestType.destruct_indices((void *)buffer, {2, 5, 7});
  EXPECT_EQ(buffer[2], destructed_value);
  EXPECT_EQ(buffer[4], 0);
  EXPECT_EQ(buffer[5], destructed_value);
  EXPECT_EQ(buffer[6], 0);
  EXPECT_EQ(buffer[7], destructed_value);
  EXPECT_EQ(buffer[8], 0);
}

TEST(cpp_type, CopyToUninitialized)
{
  int buffer1[10] = {0};
  int buffer2[10] = {0};
  CPPType_TestType.copy_construct((void *)buffer1, (void *)buffer2);
  EXPECT_EQ(buffer1[0], copy_constructed_from_value);
  EXPECT_EQ(buffer2[0], copy_constructed_value);
  CPPType_TestType.copy_construct_n((void *)buffer1, (void *)buffer2, 3);
  EXPECT_EQ(buffer1[0], copy_constructed_from_value);
  EXPECT_EQ(buffer2[0], copy_constructed_value);
  EXPECT_EQ(buffer1[1], copy_constructed_from_value);
  EXPECT_EQ(buffer2[1], copy_constructed_value);
  EXPECT_EQ(buffer1[2], copy_constructed_from_value);
  EXPECT_EQ(buffer2[2], copy_constructed_value);
  EXPECT_EQ(buffer1[3], 0);
  EXPECT_EQ(buffer2[3], 0);
  CPPType_TestType.copy_construct_indices((void *)buffer1, (void *)buffer2, {2, 5, 7});
  EXPECT_EQ(buffer1[2], copy_constructed_from_value);
  EXPECT_EQ(buffer2[2], copy_constructed_value);
  EXPECT_EQ(buffer1[4], 0);
  EXPECT_EQ(buffer2[4], 0);
  EXPECT_EQ(buffer1[5], copy_constructed_from_value);
  EXPECT_EQ(buffer2[5], copy_constructed_value);
  EXPECT_EQ(buffer1[6], 0);
  EXPECT_EQ(buffer2[6], 0);
  EXPECT_EQ(buffer1[7], copy_constructed_from_value);
  EXPECT_EQ(buffer2[7], copy_constructed_value);
  EXPECT_EQ(buffer1[8], 0);
  EXPECT_EQ(buffer2[8], 0);
}

TEST(cpp_type, CopyToInitialized)
{
  int buffer1[10] = {0};
  int buffer2[10] = {0};
  CPPType_TestType.copy_assign((void *)buffer1, (void *)buffer2);
  EXPECT_EQ(buffer1[0], copy_assigned_from_value);
  EXPECT_EQ(buffer2[0], copy_assigned_value);
  CPPType_TestType.copy_assign_n((void *)buffer1, (void *)buffer2, 3);
  EXPECT_EQ(buffer1[0], copy_assigned_from_value);
  EXPECT_EQ(buffer2[0], copy_assigned_value);
  EXPECT_EQ(buffer1[1], copy_assigned_from_value);
  EXPECT_EQ(buffer2[1], copy_assigned_value);
  EXPECT_EQ(buffer1[2], copy_assigned_from_value);
  EXPECT_EQ(buffer2[2], copy_assigned_value);
  EXPECT_EQ(buffer1[3], 0);
  EXPECT_EQ(buffer2[3], 0);
  CPPType_TestType.copy_assign_indices((void *)buffer1, (void *)buffer2, {2, 5, 7});
  EXPECT_EQ(buffer1[2], copy_assigned_from_value);
  EXPECT_EQ(buffer2[2], copy_assigned_value);
  EXPECT_EQ(buffer1[4], 0);
  EXPECT_EQ(buffer2[4], 0);
  EXPECT_EQ(buffer1[5], copy_assigned_from_value);
  EXPECT_EQ(buffer2[5], copy_assigned_value);
  EXPECT_EQ(buffer1[6], 0);
  EXPECT_EQ(buffer2[6], 0);
  EXPECT_EQ(buffer1[7], copy_assigned_from_value);
  EXPECT_EQ(buffer2[7], copy_assigned_value);
  EXPECT_EQ(buffer1[8], 0);
  EXPECT_EQ(buffer2[8], 0);
}

TEST(cpp_type, RelocateToUninitialized)
{
  int buffer1[10] = {0};
  int buffer2[10] = {0};
  CPPType_TestType.relocate_construct((void *)buffer1, (void *)buffer2);
  EXPECT_EQ(buffer1[0], destructed_value);
  EXPECT_EQ(buffer2[0], move_constructed_value);
  CPPType_TestType.relocate_construct_n((void *)buffer1, (void *)buffer2, 3);
  EXPECT_EQ(buffer1[0], destructed_value);
  EXPECT_EQ(buffer2[0], move_constructed_value);
  EXPECT_EQ(buffer1[1], destructed_value);
  EXPECT_EQ(buffer2[1], move_constructed_value);
  EXPECT_EQ(buffer1[2], destructed_value);
  EXPECT_EQ(buffer2[2], move_constructed_value);
  EXPECT_EQ(buffer1[3], 0);
  EXPECT_EQ(buffer2[3], 0);
  CPPType_TestType.relocate_construct_indices((void *)buffer1, (void *)buffer2, {2, 5, 7});
  EXPECT_EQ(buffer1[2], destructed_value);
  EXPECT_EQ(buffer2[2], move_constructed_value);
  EXPECT_EQ(buffer1[4], 0);
  EXPECT_EQ(buffer2[4], 0);
  EXPECT_EQ(buffer1[5], destructed_value);
  EXPECT_EQ(buffer2[5], move_constructed_value);
  EXPECT_EQ(buffer1[6], 0);
  EXPECT_EQ(buffer2[6], 0);
  EXPECT_EQ(buffer1[7], destructed_value);
  EXPECT_EQ(buffer2[7], move_constructed_value);
  EXPECT_EQ(buffer1[8], 0);
  EXPECT_EQ(buffer2[8], 0);
}

TEST(cpp_type, RelocateToInitialized)
{
  int buffer1[10] = {0};
  int buffer2[10] = {0};
  CPPType_TestType.relocate_assign((void *)buffer1, (void *)buffer2);
  EXPECT_EQ(buffer1[0], destructed_value);
  EXPECT_EQ(buffer2[0], move_assigned_value);
  CPPType_TestType.relocate_assign_n((void *)buffer1, (void *)buffer2, 3);
  EXPECT_EQ(buffer1[0], destructed_value);
  EXPECT_EQ(buffer2[0], move_assigned_value);
  EXPECT_EQ(buffer1[1], destructed_value);
  EXPECT_EQ(buffer2[1], move_assigned_value);
  EXPECT_EQ(buffer1[2], destructed_value);
  EXPECT_EQ(buffer2[2], move_assigned_value);
  EXPECT_EQ(buffer1[3], 0);
  EXPECT_EQ(buffer2[3], 0);
  CPPType_TestType.relocate_assign_indices((void *)buffer1, (void *)buffer2, {2, 5, 7});
  EXPECT_EQ(buffer1[2], destructed_value);
  EXPECT_EQ(buffer2[2], move_assigned_value);
  EXPECT_EQ(buffer1[4], 0);
  EXPECT_EQ(buffer2[4], 0);
  EXPECT_EQ(buffer1[5], destructed_value);
  EXPECT_EQ(buffer2[5], move_assigned_value);
  EXPECT_EQ(buffer1[6], 0);
  EXPECT_EQ(buffer2[6], 0);
  EXPECT_EQ(buffer1[7], destructed_value);
  EXPECT_EQ(buffer2[7], move_assigned_value);
  EXPECT_EQ(buffer1[8], 0);
  EXPECT_EQ(buffer2[8], 0);
}

TEST(cpp_type, FillInitialized)
{
  int buffer1 = 0;
  int buffer2[10] = {0};
  CPPType_TestType.fill_assign_n((void *)&buffer1, (void *)buffer2, 3);
  EXPECT_EQ(buffer1, copy_assigned_from_value);
  EXPECT_EQ(buffer2[0], copy_assigned_value);
  EXPECT_EQ(buffer2[1], copy_assigned_value);
  EXPECT_EQ(buffer2[2], copy_assigned_value);
  EXPECT_EQ(buffer2[3], 0);

  buffer1 = 0;
  CPPType_TestType.fill_assign_indices((void *)&buffer1, (void *)buffer2, {1, 6, 8});
  EXPECT_EQ(buffer1, copy_assigned_from_value);
  EXPECT_EQ(buffer2[0], copy_assigned_value);
  EXPECT_EQ(buffer2[1], copy_assigned_value);
  EXPECT_EQ(buffer2[2], copy_assigned_value);
  EXPECT_EQ(buffer2[3], 0);
  EXPECT_EQ(buffer2[4], 0);
  EXPECT_EQ(buffer2[5], 0);
  EXPECT_EQ(buffer2[6], copy_assigned_value);
  EXPECT_EQ(buffer2[7], 0);
  EXPECT_EQ(buffer2[8], copy_assigned_value);
  EXPECT_EQ(buffer2[9], 0);
}

TEST(cpp_type, FillUninitialized)
{
  int buffer1 = 0;
  int buffer2[10] = {0};
  CPPType_TestType.fill_construct_n((void *)&buffer1, (void *)buffer2, 3);
  EXPECT_EQ(buffer1, copy_constructed_from_value);
  EXPECT_EQ(buffer2[0], copy_constructed_value);
  EXPECT_EQ(buffer2[1], copy_constructed_value);
  EXPECT_EQ(buffer2[2], copy_constructed_value);
  EXPECT_EQ(buffer2[3], 0);

  buffer1 = 0;
  CPPType_TestType.fill_construct_indices((void *)&buffer1, (void *)buffer2, {1, 6, 8});
  EXPECT_EQ(buffer1, copy_constructed_from_value);
  EXPECT_EQ(buffer2[0], copy_constructed_value);
  EXPECT_EQ(buffer2[1], copy_constructed_value);
  EXPECT_EQ(buffer2[2], copy_constructed_value);
  EXPECT_EQ(buffer2[3], 0);
  EXPECT_EQ(buffer2[4], 0);
  EXPECT_EQ(buffer2[5], 0);
  EXPECT_EQ(buffer2[6], copy_constructed_value);
  EXPECT_EQ(buffer2[7], 0);
  EXPECT_EQ(buffer2[8], copy_constructed_value);
  EXPECT_EQ(buffer2[9], 0);
}

TEST(cpp_type, DebugPrint)
{
  int value = 42;
  std::stringstream ss;
  CPPType::get<int32_t>().print((void *)&value, ss);
  std::string text = ss.str();
  EXPECT_EQ(text, "42");
}

TEST(cpp_type, ToStaticType)
{
  Vector<const CPPType *> types;
  bool found_unsupported_type = false;
  auto fn = [&](auto type_tag) {
    using T = typename decltype(type_tag)::type;
    if constexpr (!std::is_same_v<T, void>) {
      types.append(&CPPType::get<T>());
    }
    else {
      found_unsupported_type = true;
    }
  };
  CPPType::get<std::string>().to_static_type_tag<int, float, std::string>(fn);
  CPPType::get<float>().to_static_type_tag<int, float, std::string>(fn);
  EXPECT_FALSE(found_unsupported_type);
  CPPType::get<int64_t>().to_static_type_tag<int, float, std::string>(fn);
  EXPECT_TRUE(found_unsupported_type);

  EXPECT_EQ(types.size(), 2);
  EXPECT_EQ(types[0], &CPPType::get<std::string>());
  EXPECT_EQ(types[1], &CPPType::get<float>());
}

TEST(cpp_type, CopyAssignCompressed)
{
  std::array<std::string, 5> array = {"a", "b", "c", "d", "e"};
  std::array<std::string, 3> array_compressed;
  CPPType::get<std::string>().copy_assign_compressed(&array, &array_compressed, {0, 2, 3});
  EXPECT_EQ(array_compressed[0], "a");
  EXPECT_EQ(array_compressed[1], "c");
  EXPECT_EQ(array_compressed[2], "d");
}

}  // namespace blender::tests