#ifndef MATADOR_UUID_HPP
#define MATADOR_UUID_HPP

#include <array>
#include <string>
#include <cstdint>

namespace matador::utils {
class uuid {
public:
  using uuid_array = std::array<uint32_t, 4>;

  // Default constructor initializes to zero
  uuid() = default;

  // Static UUID v4 generator
  static uuid generate();

  // Returns UUID as a string
  [[nodiscard]] std::string str() const;

  // Access to internal data
  [[nodiscard]] const uuid_array &data() const;

  // Reset UUID to zero
  void clear() { _data.fill(0); }

  // Comparisons
  friend bool operator==(const uuid &lhs, const uuid &rhs);
  friend bool operator!=(const uuid &lhs, const uuid &rhs);
  friend bool operator<(const uuid &lhs, const uuid &rhs);

private:
  uuid_array _data{0, 0, 0, 0};
};
}

// Hash specialization to allow use in unordered containers
template<>
struct std::hash<matador::utils::uuid> {
  std::size_t operator()(const matador::utils::uuid &u) const noexcept;
};

#endif //MATADOR_UUID_HPP