RandomUtil.h

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// Copyright 2024 libsese
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#pragma once
 
#include <cmath>
#include <random>
 
namespace sese {
class RandomUtil {
public:
    static constexpr int REQUIRED_UPPER_LETTER = 1;
    static constexpr int REQUIRED_LOWER_LETTER = 2;
    static constexpr int REQUIRED_DIGIT = 4;
    static constexpr int REQUIRED_SYMBOL = 8;
 
    template<class RETURN_VALUE>
    static RETURN_VALUE next();
 
    template<class RETURN_VALUE>
    static RETURN_VALUE next(RETURN_VALUE min, RETURN_VALUE max);
 
    static std::string nextString(size_t length, int required);
 
    static uint64_t nextUnsignedInt64();
 
    static std::random_device &getDevInstance() noexcept;
 
private:
    static std::string nextString(size_t length, bool upper, bool lower, bool digit, bool symbol);
 
    static const std::string UPPER_LETTER_LIST;
    static const std::string LOWER_LETTER_LIST;
    static const std::string DIGIT_LIST;
    static const std::string SYMBOL_LIST;
 
    static std::random_device dev;
};
} // namespace sese
 
template<class RETURN_VALUE>
inline RETURN_VALUE sese::RandomUtil::next() {
    return static_cast<RETURN_VALUE>(getDevInstance()());
}
 
template<class RETURN_VALUE>
inline RETURN_VALUE sese::RandomUtil::next(RETURN_VALUE min, RETURN_VALUE max) {
    const auto TEMP_MIN = std::min<RETURN_VALUE>(min, max);
    const auto TEMP_MAX = std::max<RETURN_VALUE>(min, max);
    const auto RANGE = TEMP_MAX - TEMP_MIN;
    auto TMP = getDevInstance()();
    return static_cast<RETURN_VALUE>(TMP % RANGE) + min;
}
 
template<>
inline float sese::RandomUtil::next() {
    auto pos = next<uint32_t>(0, UINT32_MAX);
    return static_cast<float>(pos) / static_cast<float>(UINT32_MAX);
}
 
template<>
inline double sese::RandomUtil::next() {
    auto pos = next<uint32_t>(0, UINT32_MAX);
    return static_cast<double>(pos) / static_cast<double>(UINT32_MAX);
}
 
template<>
inline float sese::RandomUtil::next(float min, float max) {
    const auto TMP_MIN = std::min<float>(min, max);
    const auto RANGE = std::abs(max - min);
    const auto TMP = next<float>();
    return TMP_MIN + RANGE * TMP;
}
 
template<>
inline double sese::RandomUtil::next(double min, double max) {
    const auto TMP_MIN = std::min<double>(min, max);
    const auto RANGE = std::abs(max - min);
    const auto TMP = next<double>();
    return TMP_MIN + RANGE * TMP;
}