#pragma once

/*

            ABSTRACT DEVICE COMPONENTS LIBRARY

    ASIO-library implementation of network service

 */


#ifdef USE_ASIO_LIBRARY

#include <asio/awaitable.hpp>
#include <asio/basic_datagram_socket.hpp>
#include <asio/basic_seq_packet_socket.hpp>
#include <asio/basic_stream_socket.hpp>
#include <asio/compose.hpp>
#include <asio/experimental/awaitable_operators.hpp>
#include <asio/read_until.hpp>
#include <asio/steady_timer.hpp>>
#include <asio/streambuf.hpp>
#include <asio/write.hpp>

#include <concepts>

namespace adc::impl
{


template <typename NetMessageT, typename InetProtoT>
class AdcNetServiceASIOStream
{
public:
    using socket_t = typename InetProtoT::socket;

    AdcNetServiceASIOStream(socket_t& sock) : _socket(sock) {}

    virtual ~AdcNetServiceASIOStream() = default;


    template <typename TimeoutT, asio::completion_token_for<void(std::error_code, size_t)> CompletionTokenT>
    auto asynSend(const NetMessageT& msg, const TimeoutT& timeout, CompletionTokenT&& token)
    {
        // using namespace asio::experimental::awaitable_operators;

        // auto deadline = std::chrono::steady_clock::now() + timeout;

        std::unique_ptr<asio::steady_timer> timer(_socket.get_executor());

        timer->expires_after(timeout);
        timer->async_wait([this, timer = std::move(timer)](const std::error_code& ec) {
            if (!ec) {
                _socket.cancel(std::make_error_code(std::errc::timed_out));
            }
        });


        if constexpr (std::derived_from<socket_t, asio::basic_stream_socket<typename socket_t::protocol_type>>) {
            return asio::async_write(_socket, createConstBufferSequence(msg), std::forward<CompletionTokenT>(token));
        } else if constexpr (std::derived_from<socket_t,
                                               asio::basic_datagram_socket<typename socket_t::protocol_type>>) {
            return _socket.async_send(createConstBufferSequence(msg), std::forward<CompletionTokenT>(token));
        } else if constexpr (std::derived_from<socket_t,
                                               asio::basic_seq_packet_socket<typename socket_t::protocol_type>>) {
            return _socket.async_send(createConstBufferSequence(msg), std::forward<CompletionTokenT>(token));
        } else {
            static_assert(false, "UNKNOWN ASIO-LIBRARY SOCKET TYPE!!!");
        }

        // std::error_code ec;

        // co_await (asyncSendImpl(msg) && watchdog(deadline, ec));

        // std::forward<CompletionTokenT>(token)(ec);
        // co_return asio::async_compose<CompletionTokenT, void(std::error_code)>(
        //     [ec](auto& self, const std::error_code& = {}) { self.complete(ec); }, token, _socket);
    }


    template <typename TimeoutT, typename CompletionTokenT>
    auto asyncReceive(const TimeoutT& timeout, CompletionTokenT&& token)
    {
    }


protected:
    socket_t& _socket;

    asio::streambuf _streamBuffer;

    std::vector<asio::const_buffer> createConstBufferSequence(const NetMessageT& msg)
    {
        std::vector<asio::const_buffer> buff;
        for (const auto& el : msg.template bytesView<std::vector<std::string_view>>()) {
            buff.emplace_back(asio::const_buffer(el));
        }

        return buff;
    }

    asio::awaitable<void> asyncSendImpl(const NetMessageT& msg)
    {
        // for (const auto& buff : msg.bytesView()) {
        if constexpr (std::derived_from<socket_t, asio::basic_stream_socket<typename socket_t::protocol_type>>) {
            // asio::async_write(_socket, buff, asio::use_awaitable);
            co_await asio::async_write(_socket, msg.bytesView(), asio::use_awaitable);
        } else if constexpr (std::derived_from<socket_t,
                                               asio::basic_datagram_socket<typename socket_t::protocol_type>>) {
            co_await _socket.async_send(msg.bytesView(), asio::use_awaitable);
        } else if constexpr (std::derived_from<socket_t,
                                               asio::basic_seq_packet_socket<typename socket_t::protocol_type>>) {
            co_await _socket.async_send(msg.bytesView(), asio::use_awaitable);
        } else {
            static_assert(false, "UNKNOWN ASIO-LIBRARY SOCKET TYPE!!!");
        }
        // }
    }

    template <typename TimepointT>
    asio::awaitable<void> watchdog(TimepointT& deadline, std::error_code& ec)
    {
        ec.clear();
        typename TimepointT::clock timer(co_await asio::this_coro::executor);

        auto now = TimepointT::clock::template now();

        while (deadline > now) {
            timer.expires_at(deadline);
            co_await timer.async_wait(asio::use_awaitable);
            now = TimepointT::clock::template now();
        }

        ec = std::make_error_code(std::errc::timed_out);

        throw std::system_error(ec);
    }
};


}  // namespace adc::impl


#endif