//    Copyright 2021 Jij Inc.

//    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 <utility/random.hpp>

#ifdef USE_CUDA
#endif

namespace openjij {

    /**
     * Note:
     *
     * By default, cxxjij (python implementation of openjij) is installed following the configuration listed below.
     * If you want to use cxxjij with non-default settings (e.g. using mersenne twister, calculating with long double precision, etc), please change the following configuration and recompile with the command:
     *
     * $ python setup.py clean && python setup.py install
     *
     */


    /**********************************************************
     default floating point precision on CPU (default: double)
     **********************************************************/
    using FloatType = double;
    //using FloatType = float;
    //using FloatType = long double;


    /**********************************************************
     default random number engine on CPU (default: xorshift)
     you may use mersenne twister or your own random number generator.
     **********************************************************/
    using RandomEngine = utility::Xorshift;
    //using RandomEngine = std::mt19937;
    //...


    /**********************************************************
     default floating point precision on GPU (default: float)
     **********************************************************/
    using GPUFloatType = float;
    //using GPUFloatType = double;


#ifdef USE_CUDA
    /**********************************************************
     default random number engine on GPU (default: xorwow)
     **********************************************************/
    constexpr auto GPURandomEngine = CURAND_RNG_PSEUDO_XORWOW;
    //constexpr auto GPURandomEngine = CURAND_RNG_PSEUDO_MT19937;
    //constexpr auto GPURandomEngine = CURAND_RNG_PSEUDO_DEFAULT;
    //...
    
#endif


    /**********************************************************
     default row x column x trotter size in each block in GPU
     This setting will be used in Chimera GPU.
     **********************************************************/

    //note that the size of sharedmem must be smaller than 64kB.
    constexpr std::size_t BLOCK_ROW  = 2; // row 
    constexpr std::size_t BLOCK_COL  = 2; // column
    constexpr std::size_t BLOCK_TROT = 1; // trotter size (should not be changed)


} // namespace openjij

