/*
 * Copyright (c) 2017-2023 zhllxt
 *
 * author   : zhllxt
 * email    : 37792738@qq.com
 * 
 * Distributed under the Boost Software License, Version 1.0. (See accompanying
 * file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 */

#ifndef __ASIO2_WS_SEND_OP_HPP__
#define __ASIO2_WS_SEND_OP_HPP__

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
#pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include <memory>
#include <future>
#include <utility>
#include <string_view>

#include <asio2/external/asio.hpp>
#include <asio2/external/beast.hpp>

#include <asio2/base/error.hpp>

#include <asio2/http/request.hpp>
#include <asio2/http/response.hpp>

namespace asio2::detail
{
	template<class derived_t, class args_t>
	class ws_send_op
	{
	public:
		/**
		 * @brief constructor
		 */
		ws_send_op() = default;

		/**
		 * @brief destructor
		 */
		~ws_send_op() = default;

	protected:
		template<class Data, class Callback>
		inline bool _ws_send(Data& data, Callback&& callback)
		{
			derived_t& derive = static_cast<derived_t&>(*this);

		#if defined(_DEBUG) || defined(DEBUG)
			ASIO2_ASSERT(derive.post_send_counter_.load() == 0);
			derive.post_send_counter_++;
		#endif

			derive.ws_stream().async_write(asio::buffer(data), make_allocator(derive.wallocator(),
			[&derive, callback = std::forward<Callback>(callback)]
			(const error_code& ec, std::size_t bytes_sent) mutable
			{
			#if defined(_DEBUG) || defined(DEBUG)
				derive.post_send_counter_--;
			#endif

				set_last_error(ec);

				callback(ec, bytes_sent);

				if (ec)
				{
					// must stop, otherwise re-sending will cause body confusion
					if (derive.state_ == state_t::started)
					{
						derive._do_disconnect(ec, derive.selfptr());
					}
				}
			}));

			return true;
		}

		template<bool isRequest, class Body, class Fields, class Callback>
		inline bool _ws_send(http::message<isRequest, Body, Fields>& data, Callback&& callback)
		{
			derived_t& derive = static_cast<derived_t&>(*this);

			std::vector<asio::const_buffer> buffers;

			http::serializer<isRequest, Body, Fields> sr(data);

			sr.split(false);

			for (;;)
			{
				error_code ec;

				sr.next(ec, [&sr, &buffers](error_code&, auto const& bufs) mutable
				{
					for (auto const& buf : bufs)
					{
						buffers.emplace_back(buf.data(), buf.size());

						sr.consume(buf.size());
					}
				});

				if (ec)
					break;

				if (sr.is_done())
					break;
			}

		#if defined(_DEBUG) || defined(DEBUG)
			ASIO2_ASSERT(derive.post_send_counter_.load() == 0);
			derive.post_send_counter_++;
		#endif

			derive.ws_stream().async_write(buffers, make_allocator(derive.wallocator(),
			[&derive, callback = std::forward<Callback>(callback)]
			(const error_code& ec, std::size_t bytes_sent) mutable
			{
			#if defined(_DEBUG) || defined(DEBUG)
				derive.post_send_counter_--;
			#endif

				set_last_error(ec);

				callback(ec, bytes_sent);

				if (ec)
				{
					// must stop, otherwise re-sending will cause body confusion
					if (derive.state_ == state_t::started)
					{
						derive._do_disconnect(ec, derive.selfptr());
					}
				}
			}));

			return true;
		}

		template<class Body, class Fields, class Callback>
		inline bool _ws_send(detail::http_request_impl_t<Body, Fields>& data, Callback&& callback)
		{
			derived_t& derive = static_cast<derived_t&>(*this);

			return derive._ws_send(data.base(), std::forward<Callback>(callback));
		}

		template<class Body, class Fields, class Callback>
		inline bool _ws_send(detail::http_response_impl_t<Body, Fields>& data, Callback&& callback)
		{
			derived_t& derive = static_cast<derived_t&>(*this);

			return derive._ws_send(data.base(), std::forward<Callback>(callback));
		}

	protected:
	};
}

#endif // !__ASIO2_WS_SEND_OP_HPP__