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#include <chrono>

#include <cstdint>

#include <functional>

#include <future>

#include <iostream>

#include <memory>

#include <queue>

#include <string>

#include <utility>

#include <boost/asio.hpp>

#include <boost/beast/core.hpp>

#include <boost/beast/websocket.hpp>

#include "json.h"

#include "web/websocket_client.h"

using namespace boost::asio;

using namespace boost::beast;

namespace bc

{

struct WebSocketClient::Context

{

Context(std::string const &host, uint16_t port)

{

ip::tcp::resolver resolver { ioc };

server = resolver.resolve(host, std::to_string(port));

server_url = host + ":" + std::to_string(port);

}

io_context ioc { 1 };

ip::tcp::resolver::results_type server;

std::string server_url;

};

class WebSocketClient::Connection

: public std::enable_shared_from_this<Connection>

{

public:

Connection(WebSocketClient::Context &context)

: m_stream { make_strand(context.ioc) }

{

get_lowest_layer(m_stream).connect(context.server);

get_lowest_layer(m_stream).expires_never();

m_stream.set_option(

websocket::stream_base::timeout::suggested(role_type::client));

m_stream.set_option(websocket::stream_base::decorator(

[](websocket::request_type &request)

{

request.set(http::field::user_agent, USER_AGENT);

}));

m_stream.handshake(context.server_url, "/");

}

~Connection()

{

m_stream.close(websocket::close_code::normal);

}

void send(json request, callback cb)

{

auto this_ { shared_from_this() };

m_send_queue.emplace(std::move(request), std::move(cb));

if (m_send_queue.size() > 1)

return;

write();

}

private:

void write()

{

auto this_ { shared_from_this() };

auto const &[request_, cb_] = m_send_queue.front();

m_stream.async_write(

buffer(request_.dump()),

[this_, cb_ = std::move(cb_)](error_code ec, std::size_t)

{

if (ec)

std::cerr << ec.message() << std::endl;

else

this_->on_write(std::move(cb_));

});

}

void on_write(callback cb)

{

auto this_ { shared_from_this() };

m_send_queue.pop();

read(std::move(cb));

}

void read(callback cb)

{

auto this_ { shared_from_this() };

m_stream.async_read(

m_buffer,

[this_, cb = std::move(cb)](error_code ec, std::size_t)

{

if (ec)

std::cerr << ec.message() << std::endl;

else

this_->on_read(std::move(cb));

});

}

void on_read(callback cb)

{

auto this_ { shared_from_this() };

auto buffer_data { buffers_to_string(m_buffer.data()) };

m_buffer.consume(m_buffer.size());

bool status;

std::string answer;

try {

json response = json::parse(buffer_data);

auto status_ { response["status"].get<std::string>() };

if (status_ == "ok") {

status = true;

answer = response["data"].dump();

} else {

status = false;

answer = response["data"].get<std::string>();

}

} catch (...) {

status = false;

answer = "Malformed response + '" + buffer_data + "'";

}

cb(status, answer);

// XXX Allow multiple writes to be "in flight" concurrently?

if (!m_send_queue.empty())

write();

}

private:

std::queue<std::pair<json, callback>> m_send_queue;

websocket::stream<tcp_stream> m_stream;

flat_buffer m_buffer;

};

WebSocketClient::WebSocketClient(std::string const &host, uint16_t port)

: m_host { host },

m_port { port },

m_context { std::make_unique<Context>(host, port) },

m_connection { std::make_shared<Connection>(*m_context) }

{}

WebSocketClient::~WebSocketClient()

{}

std::pair<bool, std::string> WebSocketClient::send_sync(json const &request) const

{

std::promise<void> done_promise;

std::future<void> done = done_promise.get_future();

bool success;

std::string answer;

send_async(

request,

[&](bool success_, std::string const &answer_)

{

success = success_;

answer = answer_;

done_promise.set_value();

});

run();

// XXX Handle timeout.

done.wait();

return { success, answer };

}

void WebSocketClient::send_async(json const &request, callback cb) const

{

m_connection->send(request, std::move(cb));

}

void WebSocketClient::run() const

{

m_context->ioc.run();

m_context->ioc.restart();

}

} // end namespace bc

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