/*

Copyright (c) 2010, 2012-2021, Arvid Norberg
Copyright (c) 2016-2018, Alden Torres
All rights reserved.

You may use, distribute and modify this code under the terms of the BSD license,
see LICENSE file.
*/

#include "libtorrent/session.hpp"
#include "libtorrent/session_settings.hpp"
#include "libtorrent/session_params.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/time.hpp"
#include "libtorrent/aux_/path.hpp"
#include "libtorrent/aux_/utp_stream.hpp"
#include <tuple>
#include <functional>

#include "test.hpp"
#include "setup_transfer.hpp"
#include "settings.hpp"
#include "test_utils.hpp"
#include <fstream>

#ifdef TORRENT_UTP_LOG_ENABLE
#include "libtorrent/utp_stream.hpp"
#endif

using namespace lt;

namespace {

void test_transfer()
{
#ifdef TORRENT_UTP_LOG_ENABLE
	lt::set_utp_stream_logging(true);
#endif

	// in case the previous run was terminated
	error_code ec;
	remove_all("tmp1_utp", ec);
	remove_all("tmp2_utp", ec);

	// these are declared before the session objects
	// so that they are destructed last. This enables
	// the sessions to destruct in parallel
	session_proxy p1;
	session_proxy p2;

	settings_pack pack = settings();
	pack.set_bool(settings_pack::enable_lsd, false);
	pack.set_bool(settings_pack::enable_natpmp, false);
	pack.set_bool(settings_pack::enable_upnp, false);
	pack.set_bool(settings_pack::enable_dht, false);
	pack.set_int(settings_pack::out_enc_policy, settings_pack::pe_disabled);
	pack.set_int(settings_pack::in_enc_policy, settings_pack::pe_disabled);
	pack.set_bool(settings_pack::enable_outgoing_tcp, false);
	pack.set_bool(settings_pack::enable_incoming_tcp, false);
	pack.set_bool(settings_pack::announce_to_all_trackers, true);
	pack.set_bool(settings_pack::announce_to_all_tiers, true);
	pack.set_bool(settings_pack::prefer_udp_trackers, false);
	pack.set_int(settings_pack::min_reconnect_time, 1);
	pack.set_str(settings_pack::listen_interfaces, test_listen_interface());
	lt::session ses1(pack);

	pack.set_str(settings_pack::listen_interfaces, test_listen_interface());
	lt::session ses2(pack);

	torrent_handle tor1;
	torrent_handle tor2;

	ec.clear();
	create_directory("tmp1_utp", ec);
	if (ec)
	{
		std::printf("ERROR: failed to create test directory \"tmp1_utp\": (%d) %s\n"
			, ec.value(), ec.message().c_str());
	}
	std::ofstream file("tmp1_utp/temporary");
	add_torrent_params atp = ::create_torrent(&file, "temporary", 128 * 1024, 6, false);
	file.close();

	// for performance testing
	atp.flags &= ~torrent_flags::paused;
	atp.flags &= ~torrent_flags::auto_managed;
//	atp.storage = &disabled_storage_constructor;

	// test using piece sizes smaller than 16kB
	std::tie(tor1, tor2, std::ignore) = setup_transfer(&ses1, &ses2, nullptr
		, true, false, true, "_utp", 0, &atp, false);

	const int timeout = 16;

	auto const start_time = lt::clock_type::now();
	for (int i = 0; i < timeout; ++i)
	{
		print_alerts(ses1, "ses1", true, true);
		print_alerts(ses2, "ses2", true, true);

		std::this_thread::sleep_for(lt::milliseconds(500));

		torrent_status st1 = tor1.status();
		torrent_status st2 = tor2.status();

		print_ses_rate(start_time, &st1, &st2);

		if (st2.is_finished) break;

		TEST_CHECK(st1.state == torrent_status::seeding
			|| st1.state == torrent_status::checking_files);
		TEST_CHECK(st2.state == torrent_status::downloading);
	}

	TEST_CHECK(tor1.status().is_finished);
	TEST_CHECK(tor2.status().is_finished);

	// this allows shutting down the sessions in parallel
	p1 = ses1.abort();
	p2 = ses2.abort();
}

} // anonymous namespace

TORRENT_TEST(utp)
{
	test_transfer();

	error_code ec;
	remove_all("tmp1_utp", ec);
	remove_all("tmp2_utp", ec);
}

TORRENT_TEST(compare_less_wrap)
{
	using lt::aux::compare_less_wrap;

	TEST_CHECK(compare_less_wrap(1, 2, 0xffff));
	TEST_CHECK(!compare_less_wrap(2, 1, 0xffff));
	TEST_CHECK(compare_less_wrap(100, 200, 0xffff));
	TEST_CHECK(!compare_less_wrap(200, 100, 0xffff));
	TEST_CHECK(compare_less_wrap(0xfff0, 0x000f, 0xffff)); // wrap
	TEST_CHECK(!compare_less_wrap(0xfff0, 0xff00, 0xffff));
}