//  Copyright (c) 2011-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).

#include "db/table_properties_collector.h"

#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "db/db_impl/db_impl.h"
#include "db/dbformat.h"
#include "file/sequence_file_reader.h"
#include "file/writable_file_writer.h"
#include "options/cf_options.h"
#include "rocksdb/flush_block_policy.h"
#include "rocksdb/table.h"
#include "table/block_based/block_based_table_factory.h"
#include "table/meta_blocks.h"
#include "table/plain/plain_table_factory.h"
#include "table/table_builder.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "util/coding.h"

namespace ROCKSDB_NAMESPACE {

class TablePropertiesTest : public testing::Test,
                            public testing::WithParamInterface<bool> {
 public:
  void SetUp() override { backward_mode_ = GetParam(); }

  bool backward_mode_;
};

// Utilities test functions
namespace {
static const uint32_t kTestColumnFamilyId = 66;
static const std::string kTestColumnFamilyName = "test_column_fam";
static const int kTestLevel = 1;

void MakeBuilder(
    const Options& options, const ImmutableOptions& ioptions,
    const MutableCFOptions& moptions,
    const InternalKeyComparator& internal_comparator,
    const InternalTblPropCollFactories* internal_tbl_prop_coll_factories,
    std::unique_ptr<WritableFileWriter>* writable,
    std::unique_ptr<TableBuilder>* builder) {
  std::unique_ptr<FSWritableFile> wf(new test::StringSink);
  writable->reset(
      new WritableFileWriter(std::move(wf), "" /* don't care */, EnvOptions()));
  const ReadOptions read_options;
  const WriteOptions write_options;
  TableBuilderOptions tboptions(
      ioptions, moptions, read_options, write_options, internal_comparator,
      internal_tbl_prop_coll_factories, options.compression,
      options.compression_opts, kTestColumnFamilyId, kTestColumnFamilyName,
      kTestLevel);
  builder->reset(NewTableBuilder(tboptions, writable->get()));
}
}  // namespace

// Collects keys that starts with "A" in a table.
class RegularKeysStartWithA : public TablePropertiesCollector {
 public:
  const char* Name() const override { return "RegularKeysStartWithA"; }

  Status Finish(UserCollectedProperties* properties) override {
    std::string encoded;
    std::string encoded_num_puts;
    std::string encoded_num_deletes;
    std::string encoded_num_single_deletes;
    std::string encoded_num_size_changes;
    PutVarint32(&encoded, count_);
    PutVarint32(&encoded_num_puts, num_puts_);
    PutVarint32(&encoded_num_deletes, num_deletes_);
    PutVarint32(&encoded_num_single_deletes, num_single_deletes_);
    PutVarint32(&encoded_num_size_changes, num_size_changes_);
    *properties = UserCollectedProperties{
        {"TablePropertiesTest", message_},
        {"Count", encoded},
        {"NumPuts", encoded_num_puts},
        {"NumDeletes", encoded_num_deletes},
        {"NumSingleDeletes", encoded_num_single_deletes},
        {"NumSizeChanges", encoded_num_size_changes},
    };
    return Status::OK();
  }

  Status AddUserKey(const Slice& user_key, const Slice& /*value*/,
                    EntryType type, SequenceNumber /*seq*/,
                    uint64_t file_size) override {
    // simply asssume all user keys are not empty.
    if (user_key.data()[0] == 'A') {
      ++count_;
    }
    if (type == kEntryPut) {
      num_puts_++;
    } else if (type == kEntryDelete) {
      num_deletes_++;
    } else if (type == kEntrySingleDelete) {
      num_single_deletes_++;
    }
    if (file_size < file_size_) {
      message_ = "File size should not decrease.";
    } else if (file_size != file_size_) {
      num_size_changes_++;
    }

    return Status::OK();
  }

  UserCollectedProperties GetReadableProperties() const override {
    return UserCollectedProperties{};
  }

 private:
  std::string message_ = "Rocksdb";
  uint32_t count_ = 0;
  uint32_t num_puts_ = 0;
  uint32_t num_deletes_ = 0;
  uint32_t num_single_deletes_ = 0;
  uint32_t num_size_changes_ = 0;
  uint64_t file_size_ = 0;
};

// Collects keys that starts with "A" in a table. Backward compatible mode
// It is also used to test internal key table property collector
class RegularKeysStartWithABackwardCompatible
    : public TablePropertiesCollector {
 public:
  const char* Name() const override { return "RegularKeysStartWithA"; }

  Status Finish(UserCollectedProperties* properties) override {
    std::string encoded;
    PutVarint32(&encoded, count_);
    *properties = UserCollectedProperties{{"TablePropertiesTest", "Rocksdb"},
                                          {"Count", encoded}};
    return Status::OK();
  }

  Status Add(const Slice& user_key, const Slice& /*value*/) override {
    // simply asssume all user keys are not empty.
    if (user_key.data()[0] == 'A') {
      ++count_;
    }
    return Status::OK();
  }

  UserCollectedProperties GetReadableProperties() const override {
    return UserCollectedProperties{};
  }

 private:
  uint32_t count_ = 0;
};

class RegularKeysStartWithAInternal : public InternalTblPropColl {
 public:
  const char* Name() const override { return "RegularKeysStartWithA"; }

  Status Finish(UserCollectedProperties* properties) override {
    std::string encoded;
    PutVarint32(&encoded, count_);
    *properties = UserCollectedProperties{{"TablePropertiesTest", "Rocksdb"},
                                          {"Count", encoded}};
    return Status::OK();
  }

  Status InternalAdd(const Slice& user_key, const Slice& /*value*/,
                     uint64_t /*file_size*/) override {
    // simply asssume all user keys are not empty.
    if (user_key.data()[0] == 'A') {
      ++count_;
    }
    return Status::OK();
  }

  void BlockAdd(uint64_t /* block_uncomp_bytes */,
                uint64_t /* block_compressed_bytes_fast */,
                uint64_t /* block_compressed_bytes_slow */) override {
    // Nothing to do.
  }

  UserCollectedProperties GetReadableProperties() const override {
    return UserCollectedProperties{};
  }

 private:
  uint32_t count_ = 0;
};

class RegularKeysStartWithAFactory : public InternalTblPropCollFactory,
                                     public TablePropertiesCollectorFactory {
 public:
  explicit RegularKeysStartWithAFactory(bool backward_mode)
      : backward_mode_(backward_mode) {}
  TablePropertiesCollector* CreateTablePropertiesCollector(
      TablePropertiesCollectorFactory::Context context) override {
    EXPECT_EQ(kTestColumnFamilyId, context.column_family_id);
    EXPECT_EQ(kTestLevel, context.level_at_creation);
    if (!backward_mode_) {
      return new RegularKeysStartWithA();
    } else {
      return new RegularKeysStartWithABackwardCompatible();
    }
  }
  InternalTblPropColl* CreateInternalTblPropColl(
      uint32_t /*column_family_id*/, int /* level_at_creation */) override {
    return new RegularKeysStartWithAInternal();
  }
  const char* Name() const override { return "RegularKeysStartWithA"; }

  bool backward_mode_;
};

class FlushBlockEveryThreePolicy : public FlushBlockPolicy {
 public:
  bool Update(const Slice& /*key*/, const Slice& /*value*/) override {
    return (++count_ % 3U == 0);
  }

 private:
  uint64_t count_ = 0;
};

class FlushBlockEveryThreePolicyFactory : public FlushBlockPolicyFactory {
 public:
  explicit FlushBlockEveryThreePolicyFactory() = default;

  const char* Name() const override {
    return "FlushBlockEveryThreePolicyFactory";
  }

  FlushBlockPolicy* NewFlushBlockPolicy(
      const BlockBasedTableOptions& /*table_options*/,
      const BlockBuilder& /*data_block_builder*/) const override {
    return new FlushBlockEveryThreePolicy;
  }
};

namespace {
void TestCustomizedTablePropertiesCollector(
    bool backward_mode, uint64_t magic_number, bool test_internal_tbl_prop_coll,
    const Options& options, const InternalKeyComparator& internal_comparator) {
  // make sure the entries will be inserted with order.
  std::map<std::pair<std::string, ValueType>, std::string> kvs = {
      {{"About   ", kTypeValue}, "val5"},  // starts with 'A'
      {{"Abstract", kTypeValue}, "val2"},  // starts with 'A'
      {{"Around  ", kTypeValue}, "val7"},  // starts with 'A'
      {{"Beyond  ", kTypeValue}, "val3"},
      {{"Builder ", kTypeValue}, "val1"},
      {{"Love    ", kTypeDeletion}, ""},
      {{"Cancel  ", kTypeValue}, "val4"},
      {{"Find    ", kTypeValue}, "val6"},
      {{"Rocks   ", kTypeDeletion}, ""},
      {{"Foo     ", kTypeSingleDeletion}, ""},
  };

  // -- Step 1: build table
  std::unique_ptr<TableBuilder> builder;
  std::unique_ptr<WritableFileWriter> writer;
  const ImmutableOptions ioptions(options);
  const MutableCFOptions moptions(options);
  InternalTblPropCollFactories internal_tbl_prop_coll_factories;
  if (test_internal_tbl_prop_coll) {
    internal_tbl_prop_coll_factories.emplace_back(
        new RegularKeysStartWithAFactory(backward_mode));
  } else {
    GetInternalTblPropCollFactory(ioptions, &internal_tbl_prop_coll_factories);
  }
  MakeBuilder(options, ioptions, moptions, internal_comparator,
              &internal_tbl_prop_coll_factories, &writer, &builder);

  SequenceNumber seqNum = 0U;
  for (const auto& kv : kvs) {
    InternalKey ikey(kv.first.first, seqNum++, kv.first.second);
    builder->Add(ikey.Encode(), kv.second);
  }
  ASSERT_OK(builder->Finish());
  ASSERT_OK(writer->Flush(IOOptions()));

  // -- Step 2: Read properties
  test::StringSink* fwf =
      static_cast<test::StringSink*>(writer->writable_file());
  std::unique_ptr<FSRandomAccessFile> source(
      new test::StringSource(fwf->contents()));
  std::unique_ptr<RandomAccessFileReader> fake_file_reader(
      new RandomAccessFileReader(std::move(source), "test"));

  std::unique_ptr<TableProperties> props;
  const ReadOptions read_options;
  Status s = ReadTableProperties(fake_file_reader.get(), fwf->contents().size(),
                                 magic_number, ioptions, read_options, &props);
  ASSERT_OK(s);

  auto user_collected = props->user_collected_properties;

  ASSERT_NE(user_collected.find("TablePropertiesTest"), user_collected.end());
  ASSERT_EQ("Rocksdb", user_collected.at("TablePropertiesTest"));

  uint32_t starts_with_A = 0;
  ASSERT_NE(user_collected.find("Count"), user_collected.end());
  Slice key(user_collected.at("Count"));
  ASSERT_TRUE(GetVarint32(&key, &starts_with_A));
  ASSERT_EQ(3u, starts_with_A);

  if (!backward_mode && !test_internal_tbl_prop_coll) {
    uint32_t num_puts;
    ASSERT_NE(user_collected.find("NumPuts"), user_collected.end());
    Slice key_puts(user_collected.at("NumPuts"));
    ASSERT_TRUE(GetVarint32(&key_puts, &num_puts));
    ASSERT_EQ(7u, num_puts);

    uint32_t num_deletes;
    ASSERT_NE(user_collected.find("NumDeletes"), user_collected.end());
    Slice key_deletes(user_collected.at("NumDeletes"));
    ASSERT_TRUE(GetVarint32(&key_deletes, &num_deletes));
    ASSERT_EQ(2u, num_deletes);

    uint32_t num_single_deletes;
    ASSERT_NE(user_collected.find("NumSingleDeletes"), user_collected.end());
    Slice key_single_deletes(user_collected.at("NumSingleDeletes"));
    ASSERT_TRUE(GetVarint32(&key_single_deletes, &num_single_deletes));
    ASSERT_EQ(1u, num_single_deletes);

    uint32_t num_size_changes;
    ASSERT_NE(user_collected.find("NumSizeChanges"), user_collected.end());
    Slice key_size_changes(user_collected.at("NumSizeChanges"));
    ASSERT_TRUE(GetVarint32(&key_size_changes, &num_size_changes));
    ASSERT_GE(num_size_changes, 2u);
  }
}
}  // namespace

TEST_P(TablePropertiesTest, CustomizedTablePropertiesCollector) {
  // Test properties collectors with internal keys or regular keys
  // for block based table
  for (bool encode_as_internal : {true, false}) {
    Options options;
    BlockBasedTableOptions table_options;
    table_options.flush_block_policy_factory =
        std::make_shared<FlushBlockEveryThreePolicyFactory>();
    options.table_factory.reset(NewBlockBasedTableFactory(table_options));

    test::PlainInternalKeyComparator ikc(options.comparator);
    std::shared_ptr<TablePropertiesCollectorFactory> collector_factory(
        new RegularKeysStartWithAFactory(backward_mode_));
    options.table_properties_collector_factories.resize(1);
    options.table_properties_collector_factories[0] = collector_factory;

    TestCustomizedTablePropertiesCollector(backward_mode_,
                                           kBlockBasedTableMagicNumber,
                                           encode_as_internal, options, ikc);

    // test plain table
    PlainTableOptions plain_table_options;
    plain_table_options.user_key_len = 8;
    plain_table_options.bloom_bits_per_key = 8;
    plain_table_options.hash_table_ratio = 0;

    options.table_factory =
        std::make_shared<PlainTableFactory>(plain_table_options);
    TestCustomizedTablePropertiesCollector(backward_mode_,
                                           kPlainTableMagicNumber,
                                           encode_as_internal, options, ikc);
  }
}

namespace {
void TestInternalKeyPropertiesCollector(
    bool backward_mode, uint64_t magic_number, bool sanitized,
    std::shared_ptr<TableFactory> table_factory) {
  InternalKey keys[] = {
      InternalKey("A       ", 0, ValueType::kTypeValue),
      InternalKey("B       ", 1, ValueType::kTypeValue),
      InternalKey("C       ", 2, ValueType::kTypeValue),
      InternalKey("W       ", 3, ValueType::kTypeDeletion),
      InternalKey("X       ", 4, ValueType::kTypeDeletion),
      InternalKey("Y       ", 5, ValueType::kTypeDeletion),
      InternalKey("Z       ", 6, ValueType::kTypeDeletion),
      InternalKey("a       ", 7, ValueType::kTypeSingleDeletion),
      InternalKey("b       ", 8, ValueType::kTypeMerge),
      InternalKey("c       ", 9, ValueType::kTypeMerge),
  };

  std::unique_ptr<TableBuilder> builder;
  std::unique_ptr<WritableFileWriter> writable;
  Options options;
  test::PlainInternalKeyComparator pikc(options.comparator);

  InternalTblPropCollFactories internal_tbl_prop_coll_factories;
  options.table_factory = table_factory;
  if (sanitized) {
    options.table_properties_collector_factories.emplace_back(
        new RegularKeysStartWithAFactory(backward_mode));
    // with sanitization, even regular properties collector will be able to
    // handle internal keys.
    auto comparator = options.comparator;
    // HACK: Set options.info_log to avoid writing log in
    // SanitizeOptions().
    options.info_log = std::make_shared<test::NullLogger>();
    options = SanitizeOptions("db",  // just a place holder
                              options);
    ImmutableOptions ioptions(options);
    GetInternalTblPropCollFactory(ioptions, &internal_tbl_prop_coll_factories);
    options.comparator = comparator;
  }
  const ImmutableOptions ioptions(options);
  MutableCFOptions moptions(options);

  for (int iter = 0; iter < 2; ++iter) {
    MakeBuilder(options, ioptions, moptions, pikc,
                &internal_tbl_prop_coll_factories, &writable, &builder);
    for (const auto& k : keys) {
      builder->Add(k.Encode(), "val");
    }

    ASSERT_OK(builder->Finish());
    ASSERT_OK(writable->Flush(IOOptions()));

    test::StringSink* fwf =
        static_cast<test::StringSink*>(writable->writable_file());
    std::unique_ptr<FSRandomAccessFile> source(
        new test::StringSource(fwf->contents()));
    std::unique_ptr<RandomAccessFileReader> reader(
        new RandomAccessFileReader(std::move(source), "test"));

    std::unique_ptr<TableProperties> props;
    const ReadOptions read_options;
    Status s =
        ReadTableProperties(reader.get(), fwf->contents().size(), magic_number,
                            ioptions, read_options, &props);
    ASSERT_OK(s);

    auto user_collected = props->user_collected_properties;
    uint64_t deleted = GetDeletedKeys(user_collected);
    ASSERT_EQ(5u, deleted);  // deletes + single-deletes

    bool property_present;
    uint64_t merges = GetMergeOperands(user_collected, &property_present);
    ASSERT_TRUE(property_present);
    ASSERT_EQ(2u, merges);

    if (sanitized) {
      uint32_t starts_with_A = 0;
      ASSERT_NE(user_collected.find("Count"), user_collected.end());
      Slice key(user_collected.at("Count"));
      ASSERT_TRUE(GetVarint32(&key, &starts_with_A));
      ASSERT_EQ(1u, starts_with_A);

      if (!backward_mode) {
        uint32_t num_puts;
        ASSERT_NE(user_collected.find("NumPuts"), user_collected.end());
        Slice key_puts(user_collected.at("NumPuts"));
        ASSERT_TRUE(GetVarint32(&key_puts, &num_puts));
        ASSERT_EQ(3u, num_puts);

        uint32_t num_deletes;
        ASSERT_NE(user_collected.find("NumDeletes"), user_collected.end());
        Slice key_deletes(user_collected.at("NumDeletes"));
        ASSERT_TRUE(GetVarint32(&key_deletes, &num_deletes));
        ASSERT_EQ(4u, num_deletes);

        uint32_t num_single_deletes;
        ASSERT_NE(user_collected.find("NumSingleDeletes"),
                  user_collected.end());
        Slice key_single_deletes(user_collected.at("NumSingleDeletes"));
        ASSERT_TRUE(GetVarint32(&key_single_deletes, &num_single_deletes));
        ASSERT_EQ(1u, num_single_deletes);
      }
    }
  }
}
}  // namespace

TEST_P(TablePropertiesTest, InternalKeyPropertiesCollector) {
  TestInternalKeyPropertiesCollector(
      backward_mode_, kBlockBasedTableMagicNumber, true /* sanitize */,
      std::make_shared<BlockBasedTableFactory>());
  if (backward_mode_) {
    TestInternalKeyPropertiesCollector(
        backward_mode_, kBlockBasedTableMagicNumber, false /* not sanitize */,
        std::make_shared<BlockBasedTableFactory>());
  }

  PlainTableOptions plain_table_options;
  plain_table_options.user_key_len = 8;
  plain_table_options.bloom_bits_per_key = 8;
  plain_table_options.hash_table_ratio = 0;

  TestInternalKeyPropertiesCollector(
      backward_mode_, kPlainTableMagicNumber, false /* not sanitize */,
      std::make_shared<PlainTableFactory>(plain_table_options));
}

INSTANTIATE_TEST_CASE_P(InternalKeyPropertiesCollector, TablePropertiesTest,
                        ::testing::Bool());

INSTANTIATE_TEST_CASE_P(CustomizedTablePropertiesCollector, TablePropertiesTest,
                        ::testing::Bool());

}  // namespace ROCKSDB_NAMESPACE

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