/*     Copyright 2015-2019 Egor Yusov
 *  
 *  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
 * 
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#pragma once

#include <sstream>
#include <iomanip>

namespace Diligent
{
    template<typename SSType>
    void FormatStrSS(SSType &ss)
    {
    }

    template<typename SSType, typename ArgType>
    void FormatStrSS(SSType &ss, const ArgType& Arg)
    {
        ss << Arg;
    }

    template<typename SSType, typename FirstArgType, typename... RestArgsType>
    void FormatStrSS(SSType &ss, const FirstArgType& FirstArg, const RestArgsType&... RestArgs)
    {
        FormatStrSS( ss, FirstArg );
        FormatStrSS( ss, RestArgs... ); // recursive call using pack expansion syntax
    }

    template<typename... RestArgsType>
    std::string FormatString(const RestArgsType&... Args)
    {
        std::stringstream ss;
        FormatStrSS(ss, Args...);
        return ss.str();
    }

    template<typename Type>
    struct MemorySizeFormatter
    {
        MemorySizeFormatter(Type _size, int _precision, Type _ref_size) : 
            size     (_size),
            precision(_precision),
            ref_size (_ref_size)
        {}
        Type size      = 0;
        int  precision = 0;
        Type ref_size  = 0;
    };

    template<typename Type>
    MemorySizeFormatter<Type> FormatMemorySize(Type _size, int _precision = 0, Type _ref_size = 0)
    {
        return MemorySizeFormatter<Type>{_size, _precision, _ref_size};
    }

    template<typename SSType, typename Type>
    void FormatStrSS(SSType& ss, const MemorySizeFormatter<Type>& Arg)
    {
        auto ref_size = Arg.ref_size != 0 ? Arg.ref_size : Arg.size;
        if (ref_size >= (1 << 30))
        {
            ss << std::fixed << std::setprecision(Arg.precision) << static_cast<double>(Arg.size) / double{ 1 << 30 } << " GB";
        }
        else if(ref_size >= (1 << 20))
        {
            ss << std::fixed << std::setprecision(Arg.precision) << static_cast<double>(Arg.size) / double{ 1 << 20 } << " MB";
        }
        else if (ref_size >= (1 << 10))
        {
            ss << std::fixed << std::setprecision(Arg.precision) << static_cast<double>(Arg.size) / double{ 1 << 10 } << " KB";
        }
        else
        {
            ss << Arg.size << ( ((Arg.size & 0x01) == 0x01) ? " Byte" : " Bytes" );
        }
    }
}
