/**

 * Relational pipes

 * Copyright © 2020 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 <sstream>

#include <memory>

#include <relpipe/writer/RelationalWriter.h>

#include <relpipe/writer/RelpipeWriterException.h>

#include <relpipe/writer/AttributeMetadata.h>

#include <relpipe/writer/TypeId.h>

#include <relpipe/cli/CLI.h>

#include "INICommand.h"

#include "lib/INIReader.h"

using namespace std;

using namespace relpipe::writer;

namespace relpipe {

namespace in {

namespace ini {

class FlatINIContentHandler : public INIContentHandler {

private:

	wstring_convert < codecvt_utf8<wchar_t>> convertor; // INI parser works with UTF-8

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

	Configuration& configuration;

	std::vector<std::string> currentSection;

	std::string getCurrentSectionFullName() {

		std::stringstream result;

		// TODO: configurable hierarchy delimiter

		// TODO: escape delimiter characters that are part of the section names

		for (int i = 0; i < currentSection.size(); i++) {

			if (i > 0)result << "/";

			result << currentSection[i];

		}

		return result.str();

	}

public:

	FlatINIContentHandler(std::shared_ptr<writer::RelationalWriter> writer, Configuration& configuration) : writer(writer), configuration(configuration) {

	}

	virtual ~FlatINIContentHandler() {

	}

	void startDocument() override {

		vector<AttributeMetadata> metadata;

		metadata.push_back({L"section", TypeId::STRING});

		metadata.push_back({L"key", TypeId::STRING});

		metadata.push_back({L"value", TypeId::STRING});

		writer->startRelation(configuration.relation, metadata, true);

	};

	void endDocument() override {

		currentSection.clear();

	};

	void startSection(const std::string& name) override {

		currentSection.push_back(name);

	};

	void endSection() override {

		currentSection.pop_back();

	};

		writer->writeAttribute(convertor.from_bytes(getCurrentSectionFullName()));

		writer->writeAttribute(convertor.from_bytes(key));

		writer->writeAttribute(convertor.from_bytes(value));

	};

	// TODO: handle also comments and whitespace (to allow lossless transformation from INI and back to INI)

};

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

	FlatINIContentHandler handler(writer, configuration);

	std::shared_ptr<INIReader> reader(INIReader::create(input));

	reader->addHandler(&handler);

	reader->process();

}

}

}

}