/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2015 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#ifndef __ccRandom_H_
#define __ccRandom_H_

#include <random>
#include <cstdlib>

#include "platform/CCPlatformMacros.h"

/**
* @addtogroup base
* @{
*/
NS_CC_BEGIN


/**
 * @class RandomHelper
 * @brief A helper class for creating random number.
 */
class CC_DLL RandomHelper {
public:
    template<typename T>
    static inline T random_real(T min, T max) {
        std::uniform_real_distribution<T> dist(min, max);
        auto &mt = RandomHelper::getEngine();
        return dist(mt);
    }

    template<typename T>
    static inline T random_int(T min, T max) {
        std::uniform_int_distribution<T> dist(min, max);
        auto &mt = RandomHelper::getEngine();
        return dist(mt);
    }
private:
    static std::mt19937 &getEngine();
};

/**
 * Returns a random value between `min` and `max`.
 */
template<typename T>
inline T random(T min, T max) {
    return RandomHelper::random_int<T>(min, max);
}

template<>
inline float random(float min, float max) {
    return RandomHelper::random_real(min, max);
}

template<>
inline long double random(long double min, long double max) {
    return RandomHelper::random_real(min, max);
}

template<>
inline double random(double min, double max) {
    return RandomHelper::random_real(min, max);
}

/**
 * Returns a random int between 0 and RAND_MAX.
 */
inline int random() {
    return cocos2d::random(0, RAND_MAX);
};

/**
 * Returns a random float between -1 and 1.
 * It can be seeded using std::srand(seed);
 */
inline float rand_minus1_1() {
    // FIXME: using the new c++11 random engine generator
    // without a proper way to set a seed is not useful.
    // Resorting to the old random method since it can
    // be seeded using std::srand()
    return ((std::rand() / (float)RAND_MAX) * 2) -1;

//    return cocos2d::random(-1.f, 1.f);
};

/**
 * Returns a random float between 0 and 1.
 * It can be seeded using std::srand(seed);
 */
inline float rand_0_1() {
    // FIXME: using the new c++11 random engine generator
    // without a proper way to set a seed is not useful.
    // Resorting to the old random method since it can
    // be seeded using std::srand()
    return std::rand() / (float)RAND_MAX;

//    return cocos2d::random(0.f, 1.f);
};


NS_CC_END
// end group
/// @}
#endif //__ccRandom_H_
