// Copyright (c) 2017-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.

#include <cstring>
#include <memory>
#include "util/testharness.h"
#include "utilities/merge_operators/cassandra/format.h"
#include "utilities/merge_operators/cassandra/serialize.h"

using namespace rocksdb::cassandra;

namespace rocksdb {
namespace cassandra {

TEST(ColumnTest, Column) {
  char data[4] = {'d', 'a', 't', 'a'};
  int8_t mask = 0;
  int8_t index = 1;
  int64_t timestamp = 1494022807044;
  Column c = Column(mask, index, timestamp, sizeof(data), data);

  EXPECT_EQ(c.Index(), index);
  EXPECT_EQ(c.Timestamp(), timestamp);
  EXPECT_EQ(c.Size(), 14 + sizeof(data));

  // Verify the serialization.
  std::string dest;
  dest.reserve(c.Size() * 2);
  c.Serialize(&dest);

  EXPECT_EQ(dest.size(), c.Size());
  std::size_t offset = 0;
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), mask);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), index);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), timestamp);
  offset += sizeof(int64_t);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), sizeof(data));
  offset += sizeof(int32_t);
  EXPECT_TRUE(std::memcmp(data, dest.c_str() + offset, sizeof(data)) == 0);

  // Verify the deserialization.
  std::string saved_dest = dest;
  std::unique_ptr<Column> c1 = Column::Deserialize(saved_dest.c_str(), 0);
  EXPECT_EQ(c1->Index(), index);
  EXPECT_EQ(c1->Timestamp(), timestamp);
  EXPECT_EQ(c1->Size(), 14 + sizeof(data));

  c1->Serialize(&dest);
  EXPECT_EQ(dest.size(), 2 * c.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str(), dest.c_str() + c.Size(), c.Size()) == 0);

  // Verify the ColumnBase::Deserialization.
  saved_dest = dest;
  std::unique_ptr<ColumnBase> c2 =
      ColumnBase::Deserialize(saved_dest.c_str(), c.Size());
  c2->Serialize(&dest);
  EXPECT_EQ(dest.size(), 3 * c.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str() + c.Size(), dest.c_str() + c.Size() * 2, c.Size())
      == 0);
}

TEST(ExpiringColumnTest, ExpiringColumn) {
  char data[4] = {'d', 'a', 't', 'a'};
  int8_t mask = ColumnTypeMask::EXPIRATION_MASK;
  int8_t index = 3;
  int64_t timestamp = 1494022807044;
  int32_t ttl = 3600;
  ExpiringColumn c = ExpiringColumn(mask, index, timestamp,
                                    sizeof(data), data, ttl);

  EXPECT_EQ(c.Index(), index);
  EXPECT_EQ(c.Timestamp(), timestamp);
  EXPECT_EQ(c.Size(), 18 + sizeof(data));

  // Verify the serialization.
  std::string dest;
  dest.reserve(c.Size() * 2);
  c.Serialize(&dest);

  EXPECT_EQ(dest.size(), c.Size());
  std::size_t offset = 0;
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), mask);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), index);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), timestamp);
  offset += sizeof(int64_t);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), sizeof(data));
  offset += sizeof(int32_t);
  EXPECT_TRUE(std::memcmp(data, dest.c_str() + offset, sizeof(data)) == 0);
  offset += sizeof(data);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), ttl);

  // Verify the deserialization.
  std::string saved_dest = dest;
  std::unique_ptr<ExpiringColumn> c1 =
      ExpiringColumn::Deserialize(saved_dest.c_str(), 0);
  EXPECT_EQ(c1->Index(), index);
  EXPECT_EQ(c1->Timestamp(), timestamp);
  EXPECT_EQ(c1->Size(), 18 + sizeof(data));

  c1->Serialize(&dest);
  EXPECT_EQ(dest.size(), 2 * c.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str(), dest.c_str() + c.Size(), c.Size()) == 0);

  // Verify the ColumnBase::Deserialization.
  saved_dest = dest;
  std::unique_ptr<ColumnBase> c2 =
      ColumnBase::Deserialize(saved_dest.c_str(), c.Size());
  c2->Serialize(&dest);
  EXPECT_EQ(dest.size(), 3 * c.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str() + c.Size(), dest.c_str() + c.Size() * 2, c.Size())
      == 0);
}

TEST(TombstoneTest, Tombstone) {
  int8_t mask = ColumnTypeMask::DELETION_MASK;
  int8_t index = 2;
  int32_t local_deletion_time = 1494022807;
  int64_t marked_for_delete_at = 1494022807044;
  Tombstone c = Tombstone(mask, index, local_deletion_time,
                          marked_for_delete_at);

  EXPECT_EQ(c.Index(), index);
  EXPECT_EQ(c.Timestamp(), marked_for_delete_at);
  EXPECT_EQ(c.Size(), 14);

  // Verify the serialization.
  std::string dest;
  dest.reserve(c.Size() * 2);
  c.Serialize(&dest);

  EXPECT_EQ(dest.size(), c.Size());
  std::size_t offset = 0;
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), mask);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), index);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), local_deletion_time);
  offset += sizeof(int32_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), marked_for_delete_at);

  // Verify the deserialization.
  std::unique_ptr<Tombstone> c1 = Tombstone::Deserialize(dest.c_str(), 0);
  EXPECT_EQ(c1->Index(), index);
  EXPECT_EQ(c1->Timestamp(), marked_for_delete_at);
  EXPECT_EQ(c1->Size(), 14);

  c1->Serialize(&dest);
  EXPECT_EQ(dest.size(), 2 * c.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str(), dest.c_str() + c.Size(), c.Size()) == 0);

  // Verify the ColumnBase::Deserialization.
  std::unique_ptr<ColumnBase> c2 =
    ColumnBase::Deserialize(dest.c_str(), c.Size());
  c2->Serialize(&dest);
  EXPECT_EQ(dest.size(), 3 * c.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str() + c.Size(), dest.c_str() + c.Size() * 2, c.Size())
      == 0);
}

TEST(RowValueTest, RowTombstone) {
  int32_t local_deletion_time = 1494022807;
  int64_t marked_for_delete_at = 1494022807044;
  RowValue r = RowValue(local_deletion_time, marked_for_delete_at);

  EXPECT_EQ(r.Size(), 12);
  EXPECT_EQ(r.IsTombstone(), true);
  EXPECT_EQ(r.LastModifiedTime(), marked_for_delete_at);

  // Verify the serialization.
  std::string dest;
  dest.reserve(r.Size() * 2);
  r.Serialize(&dest);

  EXPECT_EQ(dest.size(), r.Size());
  std::size_t offset = 0;
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), local_deletion_time);
  offset += sizeof(int32_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), marked_for_delete_at);

  // Verify the deserialization.
  RowValue r1 = RowValue::Deserialize(dest.c_str(), r.Size());
  EXPECT_EQ(r1.Size(), 12);
  EXPECT_EQ(r1.IsTombstone(), true);
  EXPECT_EQ(r1.LastModifiedTime(), marked_for_delete_at);

  r1.Serialize(&dest);
  EXPECT_EQ(dest.size(), 2 * r.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str(), dest.c_str() + r.Size(), r.Size()) == 0);
}

TEST(RowValueTest, RowWithColumns) {
  std::vector<std::unique_ptr<ColumnBase>> columns;
  int64_t last_modified_time = 1494022807048;
  std::size_t columns_data_size = 0;

  char e_data[5] = {'e', 'd', 'a', 't', 'a'};
  int8_t e_index = 0;
  int64_t e_timestamp = 1494022807044;
  int32_t e_ttl = 3600;
  columns.push_back(std::unique_ptr<ExpiringColumn>(
    new ExpiringColumn(ColumnTypeMask::EXPIRATION_MASK, e_index,
      e_timestamp, sizeof(e_data), e_data, e_ttl)));
  columns_data_size += columns[0]->Size();

  char c_data[4] = {'d', 'a', 't', 'a'};
  int8_t c_index = 1;
  int64_t c_timestamp = 1494022807048;
  columns.push_back(std::unique_ptr<Column>(
    new Column(0, c_index, c_timestamp, sizeof(c_data), c_data)));
  columns_data_size += columns[1]->Size();

  int8_t t_index = 2;
  int32_t t_local_deletion_time = 1494022801;
  int64_t t_marked_for_delete_at = 1494022807043;
  columns.push_back(std::unique_ptr<Tombstone>(
    new Tombstone(ColumnTypeMask::DELETION_MASK,
      t_index, t_local_deletion_time, t_marked_for_delete_at)));
  columns_data_size += columns[2]->Size();

  RowValue r = RowValue(std::move(columns), last_modified_time);

  EXPECT_EQ(r.Size(), columns_data_size + 12);
  EXPECT_EQ(r.IsTombstone(), false);
  EXPECT_EQ(r.LastModifiedTime(), last_modified_time);

  // Verify the serialization.
  std::string dest;
  dest.reserve(r.Size() * 2);
  r.Serialize(&dest);

  EXPECT_EQ(dest.size(), r.Size());
  std::size_t offset = 0;
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset),
    std::numeric_limits<int32_t>::max());
  offset += sizeof(int32_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset),
    std::numeric_limits<int64_t>::min());
  offset += sizeof(int64_t);

  // Column0: ExpiringColumn
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset),
    ColumnTypeMask::EXPIRATION_MASK);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), e_index);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), e_timestamp);
  offset += sizeof(int64_t);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), sizeof(e_data));
  offset += sizeof(int32_t);
  EXPECT_TRUE(std::memcmp(e_data, dest.c_str() + offset, sizeof(e_data)) == 0);
  offset += sizeof(e_data);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), e_ttl);
  offset += sizeof(int32_t);

  // Column1: Column
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), 0);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), c_index);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), c_timestamp);
  offset += sizeof(int64_t);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), sizeof(c_data));
  offset += sizeof(int32_t);
  EXPECT_TRUE(std::memcmp(c_data, dest.c_str() + offset, sizeof(c_data)) == 0);
  offset += sizeof(c_data);

  // Column2: Tombstone
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset),
    ColumnTypeMask::DELETION_MASK);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int8_t>(dest.c_str(), offset), t_index);
  offset += sizeof(int8_t);
  EXPECT_EQ(Deserialize<int32_t>(dest.c_str(), offset), t_local_deletion_time);
  offset += sizeof(int32_t);
  EXPECT_EQ(Deserialize<int64_t>(dest.c_str(), offset), t_marked_for_delete_at);

  // Verify the deserialization.
  RowValue r1 = RowValue::Deserialize(dest.c_str(), r.Size());
  EXPECT_EQ(r1.Size(), columns_data_size + 12);
  EXPECT_EQ(r1.IsTombstone(), false);
  EXPECT_EQ(r1.LastModifiedTime(), last_modified_time);

  r1.Serialize(&dest);
  EXPECT_EQ(dest.size(), 2 * r.Size());
  EXPECT_TRUE(
    std::memcmp(dest.c_str(), dest.c_str() + r.Size(), r.Size()) == 0);
}

} // namespace cassandra
} // namespace rocksdb

int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}