#ifndef FORTUNA_POOL_H
#define FORTUNA_POOL_H
#include "util.h"
#include <mutex>
namespace fortuna {
namespace accumulator {
class Pool {
public:
static constexpr const uint8_t NUM_OF_POOLS{32};
Pool() noexcept {};
Pool(const Pool&) = delete; // no copy
Pool(Pool&) = delete;
Pool& operator=(const Pool&) = delete;
~Pool() noexcept = default;
auto set_id(const unsigned int& id) noexcept -> void;
auto get_id() const noexcept -> unsigned int;
auto initialize_pool(const unsigned int& id) -> void;
// add entropy contained in a random event of 1 to 32 bytes
auto add_entropy(const unsigned int& source, const std::vector<char>& event)
-> int;
auto get_s_byte_count() const -> uint64_t;
auto get_s() const -> std::string;
auto clear_pool() -> void;
protected:
auto append_s(const std::string& entropy_s) -> void;
private:
unsigned int pool_id{0};
mutable std::string s{""};
uint64_t size{0};
std::mutex mtx; // mutex for write locks
mutable std::recursive_mutex ro_mtx_s; // mtx for readers of s
std::once_flag init;
}; // class Pool
} // namespace accumulator
} // namespace fortuna
#endif // FORTUNA_POOL_H
