/*
  Copyright <2018-2022> <scott.e.graves@protonmail.com>

  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
  associated documentation files (the "Software"), to deal in the Software without restriction,
  including without limitation the rights to use, copy, modify, merge, publish, distribute,
  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all copies or
  substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
  OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef INCLUDE_DB_DIRECTORY_DB_HPP_
#define INCLUDE_DB_DIRECTORY_DB_HPP_

#include "common.hpp"
#include "app_config.hpp"
#include "types/repertory.hpp"
#include "utils/rocksdb_utils.hpp"

namespace repertory {
class directory_db final {
private:
  class directory_tree final {
  private:
    std::unordered_map<std::string, std::vector<std::string>> sub_directory_lookup_;

  public:
    void add_path(const std::string &api_path, const std::vector<std::string> &files,
                  rocksdb::DB &db);

    std::size_t get_count(const std::string &api_path) const;

    std::vector<std::string> get_directories() const;

    std::vector<std::string> get_sub_directories(const std::string &api_path) const;

    bool is_directory(const std::string &api_path) const;

    bool remove_directory(const std::string &api_path, rocksdb::DB &db,
                          const bool &allow_remove_root = false);
  };

public:
  explicit directory_db(const app_config &config);

public:
  ~directory_db();

private:
  mutable std::recursive_mutex directory_mutex_;
  std::unique_ptr<rocksdb::DB> db_;
  directory_tree tree_;
  const std::string DIRDB_NAME = "directory_db";

private:
  json get_directory_data(const std::string &api_path) const;

public:
  api_error create_directory(const std::string &api_path, const bool &create_always = false);

  api_error create_file(const std::string &api_path);

  std::uint64_t get_directory_item_count(const std::string &api_path) const;

  api_error get_file(const std::string &api_path, api_file &file,
                     api_file_provider_callback api_file_provider) const;

  api_error get_file_list(api_file_list &list, api_file_provider_callback api_file_provider) const;

  std::size_t get_sub_directory_count(const std::string &api_path) const;

  std::uint64_t get_total_item_count() const;

  bool is_directory(const std::string &api_path) const;

  bool is_file(const std::string &api_path) const;

  void populate_directory_files(const std::string &api_path,
                                const meta_provider_callback &meta_provider,
                                directory_item_list &list) const;

  void populate_sub_directories(const std::string &api_path,
                                const meta_provider_callback &meta_provider,
                                directory_item_list &list) const;

  api_error remove_directory(const std::string &api_path, const bool &allow_remove_root = false);

  bool remove_file(const std::string &api_path);

  api_error rename_file(const std::string &from_api_path, const std::string &to_api_path);
};
} // namespace repertory

#endif // INCLUDE_DB_DIRECTORY_DB_HPP_