/**

 * 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/>.

 */

#pragma once

#include <memory>

#include <string>

#include <vector>

#include <iostream>

#include <sstream>

#include <locale>

#include <codecvt>

#include <relpipe/common/type/typedefs.h>

#include <relpipe/reader/TypeId.h>

#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>

#include <relpipe/reader/handlers/AttributeMetadata.h>

#include "Kafka.h"

#include "Configuration.h"

#include "Hex.h"

namespace relpipe {

namespace out {

namespace kafka {

class KafkaHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {

private:

	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.

	Configuration configuration;

	shared_ptr<Kafka> mq;

	struct CurrentRelation {

		relpipe::common::type::StringX name;

		std::vector<relpipe::reader::handlers::AttributeMetadata> attributes;

		relpipe::common::type::Integer attributeIndex = 0;

		std::string currentValue;

	} currentRelation;

public:

	KafkaHandler(Configuration configuration) : configuration(configuration) {

		mq.reset(Kafka::open(convertor.to_bytes(configuration.queue), configuration.unlinkOnClose));

	}

	void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {

		currentRelation = CurrentRelation{name, attributes};

	}

	void attribute(const relpipe::common::type::StringX& value) override {

		auto attributeName = currentRelation.attributes[currentRelation.attributeIndex].getAttributeName();

		if (attributeName == L"text") currentRelation.currentValue = convertor.to_bytes(value);

		else if (attributeName == L"data") currentRelation.currentValue = Hex::fromHex(value).str();

		currentRelation.attributeIndex++;

		if (currentRelation.attributeIndex == currentRelation.attributes.size()) {

			currentRelation.attributeIndex = 0;

			mq->send(currentRelation.currentValue);

		}

	}

	void endOfPipe() {

	}

};

}

}

}