#include <migraphx/msgpack.hpp>
#include <migraphx/serialize.hpp>
#include <msgpack.hpp>

namespace msgpack {
MSGPACK_API_VERSION_NAMESPACE(MSGPACK_DEFAULT_API_NS)
{
    namespace adaptor {

    template <>
    struct convert<migraphx::value>
    {
        const msgpack::object& operator()(const msgpack::object& o, migraphx::value& v) const
        {
            switch(o.type)
            {
            case msgpack::type::NIL:
            {
                v = nullptr;
                break;
            }
            case msgpack::type::BOOLEAN:
            {
                v = o.as<bool>();
                break;
            }
            case msgpack::type::POSITIVE_INTEGER:
            {
                v = o.as<std::uint64_t>();
                break;
            }
            case msgpack::type::NEGATIVE_INTEGER:
            {
                v = o.as<std::int64_t>();
                break;
            }
            case msgpack::type::FLOAT32:
            case msgpack::type::FLOAT64:
            {
                v = o.as<double>();
                break;
            }
            case msgpack::type::STR:
            {
                v = o.as<std::string>();
                break;
            }
            case msgpack::type::BIN:
            {
                v = migraphx::value::binary{o.via.bin.ptr, o.via.bin.size};
                break;
            }
            case msgpack::type::ARRAY:
            {
                migraphx::value r = migraphx::value::array{};
                std::for_each(
                    o.via.array.ptr,
                    o.via.array.ptr + o.via.array.size,
                    [&](const msgpack::object& so) { r.push_back(so.as<migraphx::value>()); });
                v = r;
                break;
            }
            case msgpack::type::MAP:
            {
                migraphx::value r = migraphx::value::object{};
                std::for_each(o.via.map.ptr,
                              o.via.map.ptr + o.via.map.size,
                              [&](const msgpack::object_kv& p) {
                                  r[p.key.as<std::string>()] = p.val.as<migraphx::value>();
                              });
                v = r;
                break;
            }
            case msgpack::type::EXT: { MIGRAPHX_THROW("msgpack EXT type not supported.");
            }
            }
            return o;
        }
    };

    template <>
    struct pack<migraphx::value::binary>
    {
        template <class Stream>
        packer<Stream>& operator()(msgpack::packer<Stream>& o,
                                   const migraphx::value::binary& x) const
        {
            const auto* data = reinterpret_cast<const char*>(x.data());
            auto size        = x.size();
            o.pack_bin(size);
            o.pack_bin_body(data, size);
            return o;
        }
    };

    template <>
    struct pack<migraphx::value>
    {
        template <class Stream>
        void write(msgpack::packer<Stream>& o, const std::nullptr_t&) const
        {
            o.pack_nil();
        }
        template <class Stream, class T>
        void write(msgpack::packer<Stream>& o, const T& x) const
        {
            o.pack(x);
        }
        template <class Stream>
        void write(msgpack::packer<Stream>& o, const std::vector<migraphx::value>& v) const
        {
            if(v.empty())
            {
                o.pack_array(0);
                return;
            }
            if(not v.front().get_key().empty())
            {
                o.pack_map(v.size());
                for(auto&& x : v)
                {
                    o.pack(x.get_key());
                    o.pack(x.without_key());
                }
            }
            else
            {
                o.pack_array(v.size());
                for(auto&& x : v)
                {
                    o.pack(x);
                }
            }
        }
        template <class Stream>
        packer<Stream>& operator()(msgpack::packer<Stream>& o, const migraphx::value& v) const
        {
            v.visit_value([&](auto&& x) { this->write(o, x); });
            return o;
        }
    };

    } // namespace adaptor
} // MSGPACK_API_VERSION_NAMESPACE(MSGPACK_DEFAULT_API_NS)
} // namespace msgpack

namespace migraphx {
inline namespace MIGRAPHX_INLINE_NS {

struct vector_stream
{
    std::vector<char> buffer{};
    vector_stream& write(const char* b, std::size_t n)
    {
        buffer.insert(buffer.end(), b, b + n);
        return *this;
    }
};

std::vector<char> to_msgpack(const value& v)
{
    vector_stream vs;
    msgpack::pack(vs, v);
    return vs.buffer;
}
value from_msgpack(const char* buffer, std::size_t size)
{
    msgpack::object_handle oh = msgpack::unpack(buffer, size);
    return oh.get().as<value>();
}
value from_msgpack(const std::vector<char>& buffer)
{
    return from_msgpack(buffer.data(), buffer.size());
}

} // namespace MIGRAPHX_INLINE_NS
} // namespace migraphx
