/**

 * Relational pipes

 * Copyright © 2021 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 <regex>

#include <locale>

#include <stdexcept>

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

#include <relpipe/writer/RelpipeWriterException.h>

#include "Mode.h"

namespace relpipe {

namespace tr {

namespace infertypes {

class MetadataMode : public Mode {

private:

	static const std::wregex PATTERN;

public:

	MetadataMode(shared_ptr<writer::RelationalWriter> relationalWriter) : Mode(relationalWriter) {

	}

	static bool willInfer(std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) {

		for (relpipe::reader::handlers::AttributeMetadata a : attributes) if (!std::regex_match(a.getAttributeName(), PATTERN)) return false;

		return true;

	}

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

		// TODO: this logic should be same as in relpipe-in-csv and should be shared through relpipe-lib-infertypes later

		vector<writer::AttributeMetadata> writerMetadata;

		std::wsmatch match;

		for (relpipe::reader::handlers::AttributeMetadata& am : attributes) {

			relpipe::common::type::StringX nameAndType = am.getAttributeName();

			if (std::regex_match(nameAndType, match, PATTERN)) writerMetadata.push_back({match[1], relationalWriter->toTypeId(match[2])});

			else throw relpipe::writer::RelpipeWriterException(L"Unable to find type in the attribute name: " + am.getAttributeName());

		}

		relationalWriter->startRelation(name, writerMetadata, true);

	}

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

		relationalWriter->writeAttribute(value);

	}

};

const std::wregex MetadataMode::PATTERN = std::wregex(L"(.*)::(.*)"); // name::type

}

}

}