/**
 * 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

}
}
}