// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.

#pragma once

#include <string>
#include <vector>

#include "rocksdb/options.h"
#include "util/compression.h"

namespace rocksdb {

// ImmutableCFOptions is a data struct used by RocksDB internal. It contains a
// subset of Options that should not be changed during the entire lifetime
// of DB. Raw pointers defined in this struct do not have ownership to the data
// they point to. Options contains shared_ptr to these data.
struct ImmutableCFOptions {
  explicit ImmutableCFOptions(const Options& options);

  CompactionStyle compaction_style;

  CompactionPri compaction_pri;

  CompactionOptionsUniversal compaction_options_universal;
  CompactionOptionsFIFO compaction_options_fifo;

  const SliceTransform* prefix_extractor;

  const Comparator* comparator;

  MergeOperator* merge_operator;

  const CompactionFilter* compaction_filter;

  CompactionFilterFactory* compaction_filter_factory;

  bool inplace_update_support;

  UpdateStatus (*inplace_callback)(char* existing_value,
                                   uint32_t* existing_value_size,
                                   Slice delta_value,
                                   std::string* merged_value);

  Logger* info_log;

  Statistics* statistics;

  InfoLogLevel info_log_level;

  Env* env;

  uint64_t delayed_write_rate;

  // Allow the OS to mmap file for reading sst tables. Default: false
  bool allow_mmap_reads;

  // Allow the OS to mmap file for writing. Default: false
  bool allow_mmap_writes;

  std::vector<DbPath> db_paths;

  MemTableRepFactory* memtable_factory;

  TableFactory* table_factory;

  Options::TablePropertiesCollectorFactories
      table_properties_collector_factories;

  bool advise_random_on_open;

  // This options is required by PlainTableReader. May need to move it
  // to PlainTalbeOptions just like bloom_bits_per_key
  uint32_t bloom_locality;

  bool purge_redundant_kvs_while_flush;

  bool disable_data_sync;

  bool use_fsync;

  std::vector<CompressionType> compression_per_level;

  CompressionType bottommost_compression;

  CompressionOptions compression_opts;

  bool level_compaction_dynamic_level_bytes;

  Options::AccessHint access_hint_on_compaction_start;

  bool new_table_reader_for_compaction_inputs;

  size_t compaction_readahead_size;

  int num_levels;

  bool optimize_filters_for_hits;

  // A vector of EventListeners which call-back functions will be called
  // when specific RocksDB event happens.
  std::vector<std::shared_ptr<EventListener>> listeners;

  std::shared_ptr<Cache> row_cache;

  uint32_t max_subcompactions;
};

struct MutableCFOptions {
  explicit MutableCFOptions(const ColumnFamilyOptions& options)
      : write_buffer_size(options.write_buffer_size),
        max_write_buffer_number(options.max_write_buffer_number),
        arena_block_size(options.arena_block_size),
        memtable_prefix_bloom_size_ratio(
            options.memtable_prefix_bloom_size_ratio),
        memtable_huge_page_size(options.memtable_huge_page_size),
        max_successive_merges(options.max_successive_merges),
        inplace_update_num_locks(options.inplace_update_num_locks),
        disable_auto_compactions(options.disable_auto_compactions),
        soft_pending_compaction_bytes_limit(
            options.soft_pending_compaction_bytes_limit),
        hard_pending_compaction_bytes_limit(
            options.hard_pending_compaction_bytes_limit),
        level0_file_num_compaction_trigger(
            options.level0_file_num_compaction_trigger),
        level0_slowdown_writes_trigger(options.level0_slowdown_writes_trigger),
        level0_stop_writes_trigger(options.level0_stop_writes_trigger),
        max_compaction_bytes(options.max_compaction_bytes),
        target_file_size_base(options.target_file_size_base),
        target_file_size_multiplier(options.target_file_size_multiplier),
        max_bytes_for_level_base(options.max_bytes_for_level_base),
        max_bytes_for_level_multiplier(options.max_bytes_for_level_multiplier),
        max_bytes_for_level_multiplier_additional(
            options.max_bytes_for_level_multiplier_additional),
        verify_checksums_in_compaction(options.verify_checksums_in_compaction),
        max_sequential_skip_in_iterations(
            options.max_sequential_skip_in_iterations),
        paranoid_file_checks(options.paranoid_file_checks),
        report_bg_io_stats(options.report_bg_io_stats),
        compression(options.compression),
        min_partial_merge_operands(options.min_partial_merge_operands) {
    RefreshDerivedOptions(options.num_levels, options.compaction_style);
  }

  MutableCFOptions()
      : write_buffer_size(0),
        max_write_buffer_number(0),
        arena_block_size(0),
        memtable_prefix_bloom_size_ratio(0),
        memtable_huge_page_size(0),
        max_successive_merges(0),
        inplace_update_num_locks(0),
        disable_auto_compactions(false),
        soft_pending_compaction_bytes_limit(0),
        hard_pending_compaction_bytes_limit(0),
        level0_file_num_compaction_trigger(0),
        level0_slowdown_writes_trigger(0),
        level0_stop_writes_trigger(0),
        max_compaction_bytes(0),
        target_file_size_base(0),
        target_file_size_multiplier(0),
        max_bytes_for_level_base(0),
        max_bytes_for_level_multiplier(0),
        verify_checksums_in_compaction(false),
        max_sequential_skip_in_iterations(0),
        paranoid_file_checks(false),
        report_bg_io_stats(false),
        compression(Snappy_Supported() ? kSnappyCompression : kNoCompression),
        min_partial_merge_operands(2) {}

  // Must be called after any change to MutableCFOptions
  void RefreshDerivedOptions(int num_levels, CompactionStyle compaction_style);

  void RefreshDerivedOptions(const ImmutableCFOptions& ioptions) {
    RefreshDerivedOptions(ioptions.num_levels, ioptions.compaction_style);
  }

  // Get the max file size in a given level.
  uint64_t MaxFileSizeForLevel(int level) const;
  int MaxBytesMultiplerAdditional(int level) const {
    if (level >=
        static_cast<int>(max_bytes_for_level_multiplier_additional.size())) {
      return 1;
    }
    return max_bytes_for_level_multiplier_additional[level];
  }

  void Dump(Logger* log) const;

  // Memtable related options
  size_t write_buffer_size;
  int max_write_buffer_number;
  size_t arena_block_size;
  double memtable_prefix_bloom_size_ratio;
  size_t memtable_huge_page_size;
  size_t max_successive_merges;
  size_t inplace_update_num_locks;

  // Compaction related options
  bool disable_auto_compactions;
  uint64_t soft_pending_compaction_bytes_limit;
  uint64_t hard_pending_compaction_bytes_limit;
  int level0_file_num_compaction_trigger;
  int level0_slowdown_writes_trigger;
  int level0_stop_writes_trigger;
  uint64_t max_compaction_bytes;
  uint64_t target_file_size_base;
  int target_file_size_multiplier;
  uint64_t max_bytes_for_level_base;
  int max_bytes_for_level_multiplier;
  std::vector<int> max_bytes_for_level_multiplier_additional;
  bool verify_checksums_in_compaction;

  // Misc options
  uint64_t max_sequential_skip_in_iterations;
  bool paranoid_file_checks;
  bool report_bg_io_stats;
  CompressionType compression;
  uint32_t min_partial_merge_operands;

  // Derived options
  // Per-level target file size.
  std::vector<uint64_t> max_file_size;
};

uint64_t MultiplyCheckOverflow(uint64_t op1, int op2);

}  // namespace rocksdb