// 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).

#pragma once

#include <map>

#include <string>

#include <vector>

#include "rocksdb/env.h"

#include "rocksdb/options.h"

namespace ROCKSDB_NAMESPACE {

struct ConfigOptions;

class OptionTypeInfo;

class TableFactory;

#define ROCKSDB_OPTION_FILE_MAJOR 1

#define ROCKSDB_OPTION_FILE_MINOR 1

enum OptionSection : char {

  kOptionSectionVersion = 0,

  kOptionSectionDBOptions,

  kOptionSectionCFOptions,

  kOptionSectionTableOptions,

  kOptionSectionUnknown

};

static const std::string opt_section_titles[] = {

    "Version", "DBOptions", "CFOptions", "TableOptions/", "Unknown"};

Status PersistRocksDBOptions(const WriteOptions& write_options,

                             const DBOptions& db_opt,

                             const std::vector<std::string>& cf_names,

                             const std::vector<ColumnFamilyOptions>& cf_opts,

                             const std::string& file_name, FileSystem* fs);

Status PersistRocksDBOptions(const WriteOptions& write_options,

                             const ConfigOptions& config_options,

                             const DBOptions& db_opt,

                             const std::vector<std::string>& cf_names,

                             const std::vector<ColumnFamilyOptions>& cf_opts,

                             const std::string& file_name, FileSystem* fs);

class RocksDBOptionsParser {

 public:

  explicit RocksDBOptionsParser();

  ~RocksDBOptionsParser() {}

  void Reset();

  // `file_readahead_size` is used for readahead for the option file.

  // If 0 is given, a default value will be used.

  Status Parse(const std::string& file_name, FileSystem* fs,

               bool ignore_unknown_options, size_t file_readahead_size);

  Status Parse(const ConfigOptions& config_options,

               const std::string& file_name, FileSystem* fs);

  static std::string TrimAndRemoveComment(const std::string& line,

                                          const bool trim_only = false);

  const DBOptions* db_opt() const { return &db_opt_; }

  const std::unordered_map<std::string, std::string>* db_opt_map() const {

    return &db_opt_map_;

  }

  const std::vector<ColumnFamilyOptions>* cf_opts() const { return &cf_opts_; }

  const std::vector<std::string>* cf_names() const { return &cf_names_; }

  const std::vector<std::unordered_map<std::string, std::string>>* cf_opt_maps()

      const {

    return &cf_opt_maps_;

  }

  const ColumnFamilyOptions* GetCFOptions(const std::string& name) {

    return GetCFOptionsImpl(name);

  }

  size_t NumColumnFamilies() { return cf_opts_.size(); }

  static Status VerifyRocksDBOptionsFromFile(

      const ConfigOptions& config_options, const DBOptions& db_opt,

      const std::vector<std::string>& cf_names,

      const std::vector<ColumnFamilyOptions>& cf_opts,

      const std::string& file_name, FileSystem* fs);

  static Status VerifyDBOptions(

      const ConfigOptions& config_options, const DBOptions& base_opt,

      const DBOptions& new_opt,

      const std::unordered_map<std::string, std::string>* new_opt_map =

          nullptr);

  static Status VerifyCFOptions(

      const ConfigOptions& config_options, const ColumnFamilyOptions& base_opt,

      const ColumnFamilyOptions& new_opt,

      const std::unordered_map<std::string, std::string>* new_opt_map =

          nullptr);

  static Status VerifyTableFactory(const ConfigOptions& config_options,

                                   const TableFactory* base_tf,

                                   const TableFactory* file_tf);

  static Status ExtraParserCheck(const RocksDBOptionsParser& input_parser);

  static Status ParseStatement(std::string* name, std::string* value,

                               const std::string& line, const int line_num);

 protected:

  bool IsSection(const std::string& line);

  Status ParseSection(OptionSection* section, std::string* title,

                      std::string* argument, const std::string& line,

                      const int line_num);

  Status CheckSection(const OptionSection section,

                      const std::string& section_arg, const int line_num);

  Status EndSection(

      const ConfigOptions& config_options, const OptionSection section,

      const std::string& title, const std::string& section_arg,

      const std::unordered_map<std::string, std::string>& opt_map);

  Status ValidityCheck();

  static Status InvalidArgument(const int line_num, const std::string& message);

  Status ParseVersionNumber(const std::string& ver_name,

                            const std::string& ver_string, const int max_count,

                            int* version);

  ColumnFamilyOptions* GetCFOptionsImpl(const std::string& name) {

    assert(cf_names_.size() == cf_opts_.size());

    for (size_t i = 0; i < cf_names_.size(); ++i) {

      if (cf_names_[i] == name) {

        return &cf_opts_[i];

      }

    }

    return nullptr;

  }

 private:

  DBOptions db_opt_;

  std::unordered_map<std::string, std::string> db_opt_map_;

  std::vector<std::string> cf_names_;

  std::vector<ColumnFamilyOptions> cf_opts_;

  std::vector<std::unordered_map<std::string, std::string>> cf_opt_maps_;

  bool has_version_section_;

  bool has_db_options_;

  bool has_default_cf_options_;

  int db_version[3];

  int opt_file_version[3];

};

}  // namespace ROCKSDB_NAMESPACE