/**

 * Relational pipes

 * Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#include <cstdlib>

#include <vector>

#include <memory>

#include <locale>

#include <regex>

#include <algorithm>

#include <unistd.h>

#include <sstream>

#include <iomanip>

#include <random>

#include <mosquittopp.h>

#include <relpipe/writer/RelationalWriter.h>

#include <relpipe/writer/RelpipeWriterException.h>

#include <relpipe/writer/AttributeMetadata.h>

#include <relpipe/writer/Factory.h>

#include <relpipe/writer/TypeId.h>

#include <relpipe/cli/CLI.h>

#include "MQTTCommand.h"

#include "Hex.h"

using namespace relpipe::cli;

using namespace relpipe::writer;

namespace relpipe {

namespace in {

namespace mqtt {

class MQTTClient : public mosqpp::mosquittopp {

private:

	std::shared_ptr<writer::RelationalWriter> writer;

	Configuration& configuration;

	int messageCount = 0;

	std::string clientId;

	/**

	 * @return unique (random) client ID for MQTT to allow multiple simultaneous connections

	 */

	static std::string generateClientID() {

		std::stringstream result;

		std::string symbols("0123456789abcdef");

		std::random_device dev;

		std::mt19937 rng(dev());

		return result.str();

	}

public:

	MQTTClient(std::shared_ptr<writer::RelationalWriter> writer, Configuration& configuration) : mosqpp::mosquittopp((generateClientID()).c_str()), writer(writer), configuration(configuration) {

	}

	void on_message(const mosquitto_message* message) override {

		// std::cerr << "got MQTT message: length=" << message->payloadlen << std::endl;

		std::string payload = std::string((const char*) message->payload, message->payloadlen);

		writer->writeAttribute(configuration.stream);

		writer->writeAttribute(Hex::toTxt(payload));

		writer->writeAttribute(Hex::toHex(payload));

		messageCount++;

	}

	int popMessageCount() {

		int count = messageCount;

		messageCount = 0;

		return count;

	}

};

void MQTTCommand::process(std::shared_ptr<writer::RelationalWriter> writer, Configuration& configuration) {

	std::shared_ptr<MQTTClient> mq = std::make_shared<MQTTClient>(writer, configuration);

	writer->startRelation(configuration.relation,{

		{L"stream", TypeId::STRING},

		{L"text", TypeId::STRING},

		{L"data", TypeId::STRING}

	}, true);

	int mid;

	//for (int i = configuration.messageCount; continueProcessing && i > 0; i--) {

	for (int i = configuration.messageCount; continueProcessing && i > 0; i = i - mq->popMessageCount()) {

		// std::cerr << "loop(): i=" << i << std::endl;

		//mq->loop();

		//mq->loop(1000, -1);

		//mq->loop_forever();

		//mq->loop_write();

	}

	// FIXME: move do destructor

	mq->disconnect();

}

MQTTCommand::~MQTTCommand() {

}

}

}

}