//
// bind_cancellation_slot.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot 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)
//

// Disable autolinking for unit tests.
#if !defined(BOOST_ALL_NO_LIB)
#define BOOST_ALL_NO_LIB 1
#endif // !defined(BOOST_ALL_NO_LIB)

// Test that header file is self-contained.
#include "asio/bind_cancellation_slot.hpp"

#include "asio/cancellation_signal.hpp"
#include "asio/io_context.hpp"
#include "asio/steady_timer.hpp"
#include "unit_test.hpp"

#if defined(ASIO_HAS_BOOST_DATE_TIME)
# include "asio/deadline_timer.hpp"
#else // defined(ASIO_HAS_BOOST_DATE_TIME)
# include "asio/steady_timer.hpp"
#endif // defined(ASIO_HAS_BOOST_DATE_TIME)

#if defined(ASIO_HAS_BOOST_BIND)
# include <boost/bind/bind.hpp>
#else // defined(ASIO_HAS_BOOST_BIND)
# include <functional>
#endif // defined(ASIO_HAS_BOOST_BIND)

using namespace asio;

#if defined(ASIO_HAS_BOOST_BIND)
namespace bindns = boost;
#else // defined(ASIO_HAS_BOOST_BIND)
namespace bindns = std;
#endif

#if defined(ASIO_HAS_BOOST_DATE_TIME)
typedef deadline_timer timer;
namespace chronons = boost::posix_time;
#elif defined(ASIO_HAS_CHRONO)
typedef steady_timer timer;
namespace chronons = asio::chrono;
#endif // defined(ASIO_HAS_BOOST_DATE_TIME)

void increment_on_cancel(int* count, const asio::error_code& error)
{
  if (error == asio::error::operation_aborted)
    ++(*count);
}

void bind_cancellation_slot_to_function_object_test()
{
  io_context ioc;
  cancellation_signal sig;

  int count = 0;

  timer t(ioc, chronons::seconds(5));
  t.async_wait(
      bind_cancellation_slot(sig.slot(),
        bindns::bind(&increment_on_cancel,
          &count, bindns::placeholders::_1)));

  ioc.poll();

  ASIO_CHECK(count == 0);

  sig.emit(asio::cancellation_type::all);

  ioc.run();

  ASIO_CHECK(count == 1);
}

struct incrementer_token_v1
{
  explicit incrementer_token_v1(int* c) : count(c) {}
  int* count;
};

struct incrementer_handler_v1
{
  explicit incrementer_handler_v1(incrementer_token_v1 t) : count(t.count) {}

  void operator()(asio::error_code error)
  {
    increment_on_cancel(count, error);
  }

  int* count;
};

namespace asio {

template <>
class async_result<incrementer_token_v1, void(asio::error_code)>
{
public:
  typedef incrementer_handler_v1 completion_handler_type;
  typedef void return_type;
  explicit async_result(completion_handler_type&) {}
  return_type get() {}
};

} // namespace asio

void bind_cancellation_slot_to_completion_token_v1_test()
{
  io_context ioc;
  cancellation_signal sig;

  int count = 0;

  timer t(ioc, chronons::seconds(5));
  t.async_wait(
      bind_cancellation_slot(sig.slot(),
        incrementer_token_v1(&count)));

  ioc.poll();

  ASIO_CHECK(count == 0);

  sig.emit(asio::cancellation_type::all);

  ioc.run();

  ASIO_CHECK(count == 1);
}

struct incrementer_token_v2
{
  explicit incrementer_token_v2(int* c) : count(c) {}
  int* count;
};

namespace asio {

template <>
class async_result<incrementer_token_v2, void(asio::error_code)>
{
public:
  typedef void return_type;

#if defined(ASIO_HAS_VARIADIC_TEMPLATES)

  template <typename Initiation, typename... Args>
  static void initiate(Initiation initiation,
      incrementer_token_v2 token, ASIO_MOVE_ARG(Args)... args)
  {
    initiation(
        bindns::bind(&increment_on_cancel,
          token.count, bindns::placeholders::_1),
        ASIO_MOVE_CAST(Args)(args)...);
  }

#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)

  template <typename Initiation>
  static void initiate(Initiation initiation, incrementer_token_v2 token)
  {
    initiation(
        bindns::bind(&increment_on_cancel,
          token.count, bindns::placeholders::_1));
  }

#define ASIO_PRIVATE_INITIATE_DEF(n) \
  template <typename Initiation, ASIO_VARIADIC_TPARAMS(n)> \
  static return_type initiate(Initiation initiation, \
      incrementer_token_v2 token, ASIO_VARIADIC_MOVE_PARAMS(n)) \
  { \
    initiation( \
        bindns::bind(&increment_on_cancel, \
          token.count, bindns::placeholders::_1), \
        ASIO_VARIADIC_MOVE_ARGS(n)); \
  } \
  /**/
  ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_INITIATE_DEF)
#undef ASIO_PRIVATE_INITIATE_DEF

#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
};

} // namespace asio

void bind_cancellation_slot_to_completion_token_v2_test()
{
  io_context ioc;
  cancellation_signal sig;

  int count = 0;

  timer t(ioc, chronons::seconds(5));
  t.async_wait(
      bind_cancellation_slot(sig.slot(),
        incrementer_token_v2(&count)));

  ioc.poll();

  ASIO_CHECK(count == 0);

  sig.emit(asio::cancellation_type::all);

  ioc.run();

  ASIO_CHECK(count == 1);
}

ASIO_TEST_SUITE
(
  "bind_cancellation_slot",
  ASIO_TEST_CASE(bind_cancellation_slot_to_function_object_test)
  ASIO_TEST_CASE(bind_cancellation_slot_to_completion_token_v1_test)
  ASIO_TEST_CASE(bind_cancellation_slot_to_completion_token_v2_test)
)