/**
 * 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 <zmq.hpp>

#include <relpipe/common/type/typedefs.h>
#include <relpipe/reader/TypeId.h>
#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
#include <relpipe/reader/handlers/AttributeMetadata.h>

#include "Configuration.h"
#include "Hex.h"

namespace relpipe {
namespace out {
namespace zeromq {

class ZeroMQHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {
private:
	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
	Configuration configuration;
	zmq::context_t zmqContext;
	zmq::socket_t zmqSocket;

	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:

	ZeroMQHandler(Configuration configuration) : configuration(configuration), zmqSocket(zmqContext, zmq::socket_type::push) {
		zmqSocket.connect(convertor.to_bytes(configuration.endpointUrl));
	}

	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" && value.size()) currentRelation.currentValue = convertor.to_bytes(value);
		else if (attributeName == L"data" && value.size()) currentRelation.currentValue = Hex::fromHex(value).str();
		else if (attributeName == L"text"); // keep empty or value from 'data'
		else if (attributeName == L"data"); // keep empty or value from 'text'

		currentRelation.attributeIndex++;
		if (currentRelation.attributeIndex == currentRelation.attributes.size()) {
			currentRelation.attributeIndex = 0;
			zmqSocket.send(currentRelation.currentValue.c_str(), currentRelation.currentValue.size(), 0); // FIXME: check return value
		}

	}

	void endOfPipe() {

	}

};

}
}
}