#include <boost/test/unit_test.hpp>

#include <boost/asio/io_context.hpp>
#include <boost/asio/steady_timer.hpp>

#include <async_mqtt5/mqtt_client.hpp>

#include "test_common/message_exchange.hpp"
#include "test_common/test_authenticators.hpp"
#include "test_common/test_stream.hpp"

using namespace async_mqtt5;

BOOST_AUTO_TEST_SUITE(re_auth_op/*, *boost::unit_test::disabled()*/)

struct shared_test_data {
	error_code success {};
	error_code fail = asio::error::not_connected;

	const std::string connect = encoders::encode_connect(
		"", std::nullopt, std::nullopt, 10, false, init_connect_props(), std::nullopt
	);
	const std::string connack = encoders::encode_connack(
		true, reason_codes::success.value(), {}
	);

	const std::string auth_challenge = encoders::encode_auth(
		reason_codes::reauthenticate.value(), init_auth_props()
	);
	const std::string auth_response = encoders::encode_auth(
		reason_codes::continue_authentication.value(), init_auth_props()
	);
	const std::string auth_success = encoders::encode_auth(
		reason_codes::success.value(), init_auth_props()
	);

	connect_props init_connect_props() {
		connect_props cprops;
		cprops[prop::authentication_method] = "method";
		cprops[prop::authentication_data] = "";
		return cprops;
	}

	auth_props init_auth_props() {
		auth_props aprops;
		aprops[prop::authentication_method] = "method";
		aprops[prop::authentication_data] = "";
		return aprops;
	}
};

using test::after;
using namespace std::chrono;

template <typename Authenticator = std::monostate>
void run_test(
	test::msg_exchange broker_side, Authenticator&& authenticator = {}
) {
	asio::io_context ioc;
	auto executor = ioc.get_executor();
	auto& broker = asio::make_service<test::test_broker>(
		ioc, executor, std::move(broker_side)
	);

	using client_type = mqtt_client<test::test_stream>;
	client_type c(executor, "");
	c.brokers("127.0.0.1");

	if constexpr (!std::is_same_v<Authenticator, std::monostate>)
		c.authenticator(std::forward<Authenticator>(authenticator));

	c.async_run(asio::detached);

	asio::steady_timer timer(c.get_executor());
	// wait until the connection is established
	timer.expires_after(20ms);
	timer.async_wait([&](error_code) {
		c.re_authenticate();

		timer.expires_after(150ms);
		timer.async_wait([&c](error_code) { c.cancel(); });
	});

	ioc.run();
	BOOST_CHECK(broker.received_all_expected());
}

disconnect_props dprops_with_reason_string(std::string_view reason_string) {
	disconnect_props dprops;
	dprops[prop::reason_string] = reason_string;
	return dprops;
}

BOOST_FIXTURE_TEST_CASE(successful_re_auth, shared_test_data) {
	test::msg_exchange broker_side;
	broker_side
		.expect(connect)
			.complete_with(success, after(0ms))
			.reply_with(connack, after(1ms))
		.expect(auth_challenge)
			.complete_with(success, after(2ms))
			.reply_with(auth_success, after(4ms));

	run_test(std::move(broker_side), test::test_authenticator());
}

BOOST_FIXTURE_TEST_CASE(successful_re_auth_multi_step, shared_test_data) {
	test::msg_exchange broker_side;
	broker_side
		.expect(connect)
			.complete_with(success, after(0ms))
			.reply_with(connack, after(1ms))
		.expect(auth_challenge)
			.complete_with(success, after(2ms))
			.reply_with(auth_response, after(4ms))
		.expect(auth_response)
			.complete_with(success, after(2ms))
			.reply_with(auth_success, after(4ms));

	run_test(std::move(broker_side), test::test_authenticator());
}

BOOST_FIXTURE_TEST_CASE(malformed_auth_rc, shared_test_data) {
	auto disconnect = encoders::encode_disconnect(
		reason_codes::malformed_packet.value(),
		dprops_with_reason_string("Malformed AUTH received: bad reason code")
	);
	auto malformed_auth = encoders::encode_auth(
		reason_codes::administrative_action.value(), init_auth_props()
	);

	test::msg_exchange broker_side;
	broker_side
		.expect(connect)
			.complete_with(success, after(0ms))
			.reply_with(connack, after(1ms))
		.expect(auth_challenge)
			.complete_with(success, after(2ms))
			.reply_with(malformed_auth, after(4ms))
		.expect(disconnect);

	run_test(std::move(broker_side), test::test_authenticator());
}

BOOST_FIXTURE_TEST_CASE(mismatched_auth_method, shared_test_data) {
	auth_props aprops;
	aprops[prop::authentication_method] = "wrong method";

	auto mismatched_auth_response = encoders::encode_auth(
		reason_codes::continue_authentication.value(), aprops
	);

	auto disconnect = encoders::encode_disconnect(
		reason_codes::protocol_error.value(),
		dprops_with_reason_string("Malformed AUTH received: wrong authentication method")
	);

	test::msg_exchange broker_side;
	broker_side
		.expect(connect)
			.complete_with(success, after(0ms))
			.reply_with(connack, after(1ms))
		.expect(auth_challenge)
			.complete_with(success, after(2ms))
			.reply_with(mismatched_auth_response, after(4ms))
		.expect(disconnect);

	run_test(std::move(broker_side), test::test_authenticator());
}

BOOST_FIXTURE_TEST_CASE(async_auth_fail, shared_test_data) {
	auto disconnect = encoders::encode_disconnect(
		reason_codes::unspecified_error.value(),
		dprops_with_reason_string("Re-authentication: authentication fail")
	);

	test::msg_exchange broker_side;
	broker_side
		.expect(connect)
			.complete_with(success, after(0ms))
			.reply_with(connack, after(1ms))
		.expect(auth_challenge)
			.complete_with(success, after(2ms))
			.reply_with(auth_response, after(4ms))
		.expect(disconnect);

	run_test(
		std::move(broker_side),
		test::fail_test_authenticator<auth_step_e::server_challenge>()
	);
}

BOOST_FIXTURE_TEST_CASE(re_auth_without_authenticator, shared_test_data) {
	auto connect_no_auth = encoders::encode_connect(
		"", std::nullopt, std::nullopt, 10, false, {}, std::nullopt
	);

	test::msg_exchange broker_side;
	broker_side
		.expect(connect_no_auth)
			.complete_with(success, after(0ms))
			.reply_with(connack, after(1ms));

	run_test(std::move(broker_side));
}

BOOST_AUTO_TEST_SUITE_END();