/**

 * 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 <regex>

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

#include <relpipe/reader/TypeId.h>

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

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

#include "Socket.h"

#include "Configuration.h"

#include "Hex.h"

namespace relpipe {

namespace out {

namespace socket {

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

private:

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

	Configuration configuration;

	std::shared_ptr<Socket> socket;

	std::wregex relationPattern;

	struct CurrentRelation {

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

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

		bool valid;

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

		std::string currentValue;

	} currentRelation;

	void configureSocket() {

		if (socket) {

			// already configured, reuse

		} else {

			std::vector<SocketOption> options;

			for (auto o : configuration.options) options.push_back({convertor.to_bytes(o.name), convertor.to_bytes(o.value)});

			if (auto f = SocketFactory::find(options)) socket = f->open(options);

		}

	}

public:

	SocketHandler(Configuration configuration) : configuration(configuration), relationPattern(std::wregex(configuration.relation)) {

	}

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

		currentRelation = CurrentRelation{name, attributes, std::regex_match(name, relationPattern)};

		if (currentRelation.valid) configureSocket();

	}

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

		if (currentRelation.valid) {

			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;

				socket->send(currentRelation.currentValue);

			}

		}

	}

	void endOfPipe() {

	}

};

}

}

}