/**
 * 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() {

	}

};

}
}
}