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#ifndef FUSE_CORE__UUID_HPP_
#define FUSE_CORE__UUID_HPP_

#include <functional>
#include <string>

#include <boost/functional/hash.hpp>
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <rclcpp/time.hpp>

namespace fuse_core
{

using UUID = boost::uuids::uuid;

namespace uuid
{
using boost::uuids::to_string;
using hash = boost::hash<UUID>;
constexpr UUID NIL = {{0}};

inline UUID from_string(const std::string & uuid_string)
{
  return boost::uuids::string_generator()(uuid_string);
}

UUID generate();

inline UUID generate(const void * data, size_t byte_count)
{
  return boost::uuids::name_generator(NIL)(data, byte_count);
}

inline UUID generate(const char * data)
{
  return generate(data, std::strlen(data));
}

inline UUID generate(const std::string & data)
{
  return generate(data.c_str(), data.length());
}

inline UUID generate(const std::string & namespace_string, const void * data, size_t byte_count)
{
  return boost::uuids::name_generator(generate(namespace_string))(data, byte_count);
}

inline UUID generate(const std::string & namespace_string, const char * data)
{
  return generate(namespace_string, data, std::strlen(data));
}

inline UUID generate(const std::string & namespace_string, const std::string & data)
{
  return generate(namespace_string, data.c_str(), data.length());
}

UUID generate(const std::string & namespace_string, const rclcpp::Time & stamp);

UUID generate(const std::string & namespace_string, const rclcpp::Time & stamp, const UUID & id);

UUID generate(const std::string & namespace_string, const uint64_t & user_id);
}  // namespace uuid

}  // namespace fuse_core

namespace std
{

template<>
struct hash<fuse_core::UUID>
{
  size_t operator()(const fuse_core::UUID & id) const
  {
    return boost::uuids::hash_value(id);
  }
};

}  // namespace std

#endif  // FUSE_CORE__UUID_HPP_