#include "uuid.h"
#include <random>
#include <sstream>
#include <string>

std::string UUID::generate_uuid() {
    std::stringstream hexstream;
    hexstream << UUID::generate_hex(4) << "-" << UUID::generate_hex(2) << "-"
              << UUID::generate_hex(2) << "-" << UUID::generate_hex(2) << "-"
              << UUID::generate_hex(6);
    return hexstream.str();
}

std::string UUID::generate_hex(const unsigned int len) {
    std::stringstream ss;
    for (auto i = 0; i < len; i++) {
      const auto rc = random_char();
      std::stringstream hexstream;
      hexstream << std::hex << rc;
      auto hex = hexstream.str();
      ss << (hex.length() < 2 ? '0' + hex : hex);
    }
    return ss.str();
}

unsigned int UUID::random_char() {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(0, 255);
    return dis(gen);
}