// message_test.cpp
//
// Unit tests for the message class in the Paho MQTT C++ library.
//

/*******************************************************************************
 * Copyright (c) 2016-2020 Frank Pagliughi <fpagliughi@mindspring.com>
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 *
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *   http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *    Frank Pagliughi - initial implementation and documentation
 *******************************************************************************/

#define UNIT_TESTS

#include <cstring>
#include "catch2/catch.hpp"
#include "mqtt/message.h"

using namespace mqtt;

static const std::string EMPTY_STR;
static const int DFLT_QOS = 0;
static const bool DFLT_RETAINED = false;
static const bool DFLT_DUP = false;

static const std::string TOPIC { "hello" };
static const char* BUF = "Hello there";
static const size_t N = std::strlen(BUF);
static const std::string PAYLOAD = std::string(BUF);
static const int QOS = 1;

// --------------------------------------------------------------------------
// Test the default constructor
// --------------------------------------------------------------------------

TEST_CASE("default constructor", "[message]")
{
    mqtt::message msg;

    REQUIRE(EMPTY_STR == msg.get_payload_str());
    REQUIRE(DFLT_QOS == msg.get_qos());
    REQUIRE(DFLT_RETAINED == msg.is_retained());
    REQUIRE(DFLT_DUP == msg.is_duplicate());

    const auto& c_struct = msg.c_struct();

	REQUIRE(0 == c_struct.payloadlen);
	REQUIRE(nullptr == c_struct.payload);
	REQUIRE(DFLT_QOS == c_struct.qos);
	REQUIRE(DFLT_RETAINED == (c_struct.retained != 0));
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}

// --------------------------------------------------------------------------
// Test the raw buffer (void*) and length constructor
// --------------------------------------------------------------------------

TEST_CASE("buf len constructor", "[message]")
{
	mqtt::message msg(TOPIC, BUF, N);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(DFLT_QOS == msg.get_qos());
	REQUIRE(DFLT_RETAINED == msg.is_retained());
	REQUIRE(DFLT_DUP == msg.is_duplicate());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(N) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(BUF, c_struct.payload, N));
	REQUIRE(DFLT_QOS == c_struct.qos);
	REQUIRE(DFLT_RETAINED == (c_struct.retained != 0));
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}

// --------------------------------------------------------------------------
// Test the raw buffer (void*) constructor
// --------------------------------------------------------------------------

TEST_CASE("buf constructor", "[message]")
{
	mqtt::message msg(TOPIC, BUF, N, QOS, true);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());
	REQUIRE(DFLT_DUP == msg.is_duplicate());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(N) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(BUF, c_struct.payload, N));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}

// --------------------------------------------------------------------------
// Test the string buffer constructor
// --------------------------------------------------------------------------

TEST_CASE("string constructor", "[message]")
{
	mqtt::message msg(TOPIC, PAYLOAD);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(DFLT_QOS == msg.get_qos());
	REQUIRE(!msg.is_retained());
	REQUIRE(DFLT_DUP == msg.is_duplicate());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(DFLT_QOS == c_struct.qos);
	REQUIRE(DFLT_RETAINED == (c_struct.retained != 0));
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}

// --------------------------------------------------------------------------
// Test the string buffer with QoS constructor
// --------------------------------------------------------------------------

TEST_CASE("string qos constructor", "[message]")
{
	mqtt::message msg(TOPIC, PAYLOAD, QOS, true);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());
	REQUIRE(DFLT_DUP == msg.is_duplicate());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}

// --------------------------------------------------------------------------
// Test the initialization by C struct
// --------------------------------------------------------------------------

TEST_CASE("c struct constructor", "[message]")
{
	MQTTAsync_message c_msg = MQTTAsync_message_initializer;

	c_msg.payload = const_cast<char*>(BUF);
	c_msg.payloadlen = N;
	c_msg.qos = QOS;
	c_msg.retained = 1;
	c_msg.dup = 1;

	mqtt::message msg(TOPIC, c_msg);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());
	REQUIRE(msg.is_duplicate());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(N) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(BUF, c_struct.payload, N));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(c_struct.dup != 0);
}

// --------------------------------------------------------------------------
// Test the copy constructor
// --------------------------------------------------------------------------

TEST_CASE("copy constructor", "[message]")
{
    auto orgMsg = mqtt::message(TOPIC, PAYLOAD, QOS, true);

	mqtt::message msg(orgMsg);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));

	// Make sure it's a true copy, not linked to the original
	orgMsg.set_payload(EMPTY_STR);
	orgMsg.set_qos(DFLT_QOS);
	orgMsg.set_retained(false);

	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());
}

// --------------------------------------------------------------------------
// Test the move constructor
// --------------------------------------------------------------------------

TEST_CASE("move constructor", "[message]")
{
    auto orgMsg = mqtt::message(TOPIC, PAYLOAD, QOS, true);

	mqtt::message msg(std::move(orgMsg));

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));

	// Check that the original was moved
	REQUIRE(size_t(0) == orgMsg.get_payload().size());
}

// --------------------------------------------------------------------------
// Test the copy assignment operator=(const&)
// --------------------------------------------------------------------------

TEST_CASE("copy assignment", "[message]")
{
    auto orgMsg = mqtt::message(TOPIC, PAYLOAD, QOS, true);

    mqtt::message msg;
	msg = orgMsg;

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));

	// Make sure it's a true copy, not linked to the original
	orgMsg.set_payload(EMPTY_STR);
	orgMsg.set_qos(DFLT_QOS);
	orgMsg.set_retained(false);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());

	// Self assignment should cause no harm
	msg = msg;

	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());
}

// --------------------------------------------------------------------------
// Test the move assignment, operator=(&&)
// --------------------------------------------------------------------------

TEST_CASE("move assignment", "[message]")
{
    auto orgMsg = mqtt::message(TOPIC, PAYLOAD, QOS, true);

    mqtt::message msg;
	msg = std::move(orgMsg);

	REQUIRE(TOPIC == msg.get_topic());
	REQUIRE(PAYLOAD == msg.get_payload_str());
	REQUIRE(QOS == msg.get_qos());
	REQUIRE(msg.is_retained());

	const auto& c_struct = msg.c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));

	// Check that the original was moved
	REQUIRE(size_t(0) == orgMsg.get_payload().size());

	// Self assignment should cause no harm
	// (clang++ is smart enough to warn about this)
	#if !defined(__clang__)
		msg = std::move(msg);
		REQUIRE(PAYLOAD == msg.get_payload_str());
		REQUIRE(QOS == msg.get_qos());
		REQUIRE(msg.is_retained());
	#endif
}

// --------------------------------------------------------------------------
// Test the validate_qos()
// --------------------------------------------------------------------------

TEST_CASE("validate qos", "[message]")
{
    REQUIRE_THROWS_AS(mqtt::message::validate_qos(-1), mqtt::exception);
    REQUIRE_THROWS_AS(mqtt::message::validate_qos(3), mqtt::exception);

    REQUIRE_NOTHROW(mqtt::message::validate_qos(0));
}

/////////////////////////////////////////////////////////////////////////////

// --------------------------------------------------------------------------
// Test the default builder
// --------------------------------------------------------------------------

TEST_CASE("default builder", "[message]")
{
	auto msg = mqtt::message_ptr_builder().finalize();

    REQUIRE(EMPTY_STR == msg->get_payload_str());
    REQUIRE(DFLT_QOS == msg->get_qos());
    REQUIRE(DFLT_RETAINED == msg->is_retained());
    REQUIRE(DFLT_DUP == msg->is_duplicate());

    const auto& c_struct = msg->c_struct();

	REQUIRE(0 == c_struct.payloadlen);
	REQUIRE(nullptr == c_struct.payload);
	REQUIRE(DFLT_QOS == c_struct.qos);
	REQUIRE(DFLT_RETAINED == (c_struct.retained != 0));
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}

// --------------------------------------------------------------------------
// Test a complete builder
// --------------------------------------------------------------------------

TEST_CASE("builder", "[message]")
{
	auto msg = mqtt::message_ptr_builder()
			       .topic(TOPIC)
			       .payload(PAYLOAD)
				   .qos(QOS)
				   .retained(true)
				   .finalize();

	REQUIRE(TOPIC == msg->get_topic());
	REQUIRE(PAYLOAD == msg->get_payload_str());
	REQUIRE(QOS == msg->get_qos());
	REQUIRE(msg->is_retained());
	REQUIRE(DFLT_DUP == msg->is_duplicate());

	const auto& c_struct = msg->c_struct();

	REQUIRE(int(PAYLOAD.size()) == c_struct.payloadlen);
	REQUIRE(0 == memcmp(PAYLOAD.data(), c_struct.payload, PAYLOAD.size()));
	REQUIRE(QOS == c_struct.qos);
	REQUIRE(c_struct.retained != 0);
	REQUIRE(DFLT_DUP == (c_struct.dup != 0));
}