#pragma once

#include <iostream>
#include <memory>
#include <utility>
#include <asio.hpp>

using asio::ip::tcp;

class Session
  : public std::enable_shared_from_this<Session>
{
public:
  Session(tcp::socket socket)
    : socket_(std::move(socket))
  {
  }

  void start()
  {
    auto self(shared_from_this());
    char hello[] = "\nUse \"n name\" to change name, \"v velocity\" to change velocity, \"c\" to clear past shots or \"q\" to close the connection.\nEverything else is interpreted as a shooting angle.\n\n>";
    asio::async_write(socket_, asio::buffer(hello, strlen(hello)),
        [this, self](std::error_code ec, std::size_t /*length*/)
        {
          if (!ec)
          {
            do_read();
          }
        });
  }

private:
  void do_read()
  {
    auto self(shared_from_this());
    socket_.async_read_some(asio::buffer(data_, max_length),
        [this, self](std::error_code ec, std::size_t length)
        {
          if (!ec)
          {
            do_write(length);
          }
        });
  }

  void do_write(std::size_t length)
  {
    auto self(shared_from_this());
    asio::async_write(socket_, asio::buffer(data_, length),
        [this, self](std::error_code ec, std::size_t /*length*/)
        {
          if (!ec)
          {
            do_read();
          }
        });
  }

  tcp::socket socket_;
  enum { max_length = 1024 };
  char data_[max_length];
};