//////////////////////////////////////////////////////////////////////////////
// This file is part of the Journey MMORPG client                           //
// Copyright © 2015-2016 Daniel Allendorf                                   //
//                                                                          //
// This program is free software: you can redistribute it and/or modify     //
// it under the terms of the GNU Affero General Public License as           //
// published by the Free Software Foundation, either version 3 of the       //
// License, or (at your option) any later version.                          //
//                                                                          //
// This program is distributed in the hope that it will be useful,          //
// but WITHOUT ANY WARRANTY; without even the implied warranty of           //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            //
// GNU Affero General Public License for more details.                      //
//                                                                          //
// You should have received a copy of the GNU Affero General Public License //
// along with this program.  If not, see <http://www.gnu.org/licenses/>.    //
//////////////////////////////////////////////////////////////////////////////
#pragma once
#include <cstdint>
#include <random>

namespace jrc
{
    // Can be used to generate random numbers.
    class Randomizer
    {
    public:
        bool next_bool() const
        {
            return next_int(2) == 1;
        }

        bool below(float percent) const
        {
            return next_real(1.0f) < percent;
        }

        bool above(float percent) const
        {
            return next_real(1.0f) > percent;
        }

        template <class T>
        T next_real(T to) const
        {
            return next_real<T>(0, to);
        }

        template <class T>
        T next_real(T from, T to) const
        {
            if (from >= to)
                return from;

            std::uniform_real_distribution<T> range(from, to);
            std::random_device rd;
            std::default_random_engine engine{ rd() };
            return range(engine);
        }

        template <class T>
        T next_int(T to) const
        {
            return next_int<T>(0, to);
        }

        template <class T>
        T next_int(T from, T to) const
        {
            if (from >= to)
                return from;

            std::uniform_int_distribution<T> range(from, to - 1);
            std::random_device rd;
            std::default_random_engine engine{ rd() };
            return range(engine);
        }

        template <class E>
        E next_enum(E to = E::LENGTH) const
        {
            return next_enum(E(), to);
        }

        template <class E>
        E next_enum(E from, E to) const
        {
            auto next_underlying = next_int<typename std::underlying_type<E>::type>(from, to);
            return static_cast<E>(next_underlying);
        }
    };
}