//MIT License
//
//Copyright (c) 2017 Mindaugas Vinkelis
//
//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.
//
//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. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//SOFTWARE.

#ifndef BITSERY_EXT_GROWABLE_H
#define BITSERY_EXT_GROWABLE_H

#include "../traits/core/traits.h"

namespace bitsery {

    namespace ext {

        /*
         * enables forward and backward compatibility, by allowing to append additional data at the end of serialization
         * old deserialization method will ignore additional data by jumping through it at the end of deserialization flow
         * new deserialization method will read all 0 for new fields if there is no data for it
         */
        class Growable {
        public:

            template<typename Ser, typename T, typename Fnc>
            void serialize(Ser &ser, const T &obj, Fnc &&fnc) const {
                auto& writer = ser.adapter();
                const auto startPos = writer.currentWritePos();
                writer.template writeBytes<4>(static_cast<uint32_t>(0));

                fnc(ser, const_cast<T&>(obj));

                const auto endPos = writer.currentWritePos();
                writer.currentWritePos(startPos);
                writer.template writeBytes<4>(static_cast<uint32_t>(endPos - startPos));
                writer.currentWritePos(endPos);
            }

            template<typename Des, typename T, typename Fnc>
            void deserialize(Des &des, T &obj, Fnc &&fnc) const {
                auto& reader = des.adapter();
                uint32_t size{};
                const auto readEndPos = reader.currentReadEndPos();
                const auto startPos = reader.currentReadPos();
                reader.template readBytes<4>(size);
                reader.currentReadEndPos(startPos + size);

                fnc(des, obj);

                reader.currentReadPos(startPos + size);
                reader.currentReadEndPos(readEndPos);
            }
        };
    }

    namespace traits {
        template<typename T>
        struct ExtensionTraits<ext::Growable, T> {
            using TValue = T;
            static constexpr bool SupportValueOverload = false;
            static constexpr bool SupportObjectOverload = true;
            static constexpr bool SupportLambdaOverload = true;
        };
    }

}


#endif //BITSERY_EXT_GROWABLE_H
