/**
 * 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 <relpipe/common/type/typedefs.h>

#include "Mode.h"

namespace relpipe {
namespace tr {
namespace infertypes {

class DataMode : public Mode {
private:
	static const std::wregex BOOLEAN_PATTERN;
	static const std::wregex INTEGER_PATTERN;
	relpipe::common::type::StringX name;
	std::vector<relpipe::reader::handlers::AttributeMetadata> attributes;
	std::vector<relpipe::common::type::StringX> values;

	bool matches(int attributeIndex, const std::wregex& pattern) {
		for (int record = 0, attributeCount = attributes.size(), limit = values.size() / attributeCount; record < limit; record++) if (!std::regex_match(values[record * attributeIndex], pattern)) return false;
		return true;
	}

public:

	DataMode(shared_ptr<writer::RelationalWriter> relationalWriter) : Mode(relationalWriter) {
	}

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

	void attribute(const relpipe::common::type::StringX& value) override {
		values.push_back(value);
	}

	virtual ~DataMode() {
		std::vector<bool> booleans(attributes.size(), true);
		std::vector<bool> integers(attributes.size(), true);

		for (int i = 0, limit = attributes.size(); i < limit; i++) {
			booleans[i] = matches(i, BOOLEAN_PATTERN);
			integers[i] = matches(i, INTEGER_PATTERN);
		}

		vector<writer::AttributeMetadata> writerMetadata;
		for (int i = 0, limit = attributes.size(); i < limit; i++) {
			relpipe::reader::handlers::AttributeMetadata& am = attributes[i];

			relpipe::writer::TypeId type;
			if (booleans[i]) type = relpipe::writer::TypeId::BOOLEAN;
			else if (integers[i]) type = relpipe::writer::TypeId::INTEGER;
			else type = relpipe::writer::TypeId::STRING;

			writerMetadata.push_back({am.getAttributeName(), type});
		}

		relationalWriter->startRelation(name, writerMetadata, true);
		for (relpipe::common::type::StringX& value : values) relationalWriter->writeAttribute(value);
	}
};

const std::wregex DataMode::BOOLEAN_PATTERN = std::wregex(L"true|false");
const std::wregex DataMode::INTEGER_PATTERN = std::wregex(L"[0-9]+");

}
}
}