/**
 * 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 <memory>
#include <string>
#include <vector>
#include <iostream>
#include <sstream>
#include <locale>
#include <codecvt>
#include <regex>
#include <stdexcept>

#include <relpipe/reader/typedefs.h>
#include <relpipe/reader/TypeId.h>
#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
#include <relpipe/reader/handlers/AttributeMetadata.h>

#include <relpipe/writer/Factory.h>

#include <relpipe/cli/RelpipeCLIException.h>

#include "Configuration.h"
#include "Mode.h"
#include "DataMode.h"
#include "MetadataMode.h"

namespace relpipe {
namespace tr {
namespace infertypes {

using namespace std;
using namespace relpipe;
using namespace relpipe::reader;
using namespace relpipe::reader::handlers;

class InferTypesHandler : public RelationalReaderStringHandler {
private:
	shared_ptr<writer::RelationalWriter> relationalWriter;
	Configuration configuration;
	std::shared_ptr<Mode> currentMode;

	vector<writer::AttributeMetadata> toWriterMetadata(vector<AttributeMetadata> attributes) {
		// TODO: move to a reusable method (or use same metadata on both reader and writer side?)
		vector<writer::AttributeMetadata> writerMetadata;
		for (AttributeMetadata readerMetadata : attributes) {
			writerMetadata.push_back({readerMetadata.getAttributeName(), relationalWriter->toTypeId(readerMetadata.getTypeName())});
		}
		return writerMetadata;
	}

public:

	InferTypesHandler(shared_ptr<writer::RelationalWriter> relationalWriter, Configuration configuration) : relationalWriter(relationalWriter), configuration(configuration) {
	}

	void startRelation(string_t name, vector<AttributeMetadata> attributes) override {
		// TODO: move this logic to relpipe-lib-infertypes and share with certain modules like relpipe-in-csv
		for (RelationConfiguration rc : configuration.relationConfigurations) {
			if (std::regex_match(name, rc.relationPattern)) {
				if (rc.mode == MODE::METADATA || rc.mode == MODE::AUTO && MetadataMode::willInfer(attributes)) currentMode.reset(new MetadataMode(relationalWriter));
				else if (rc.mode == MODE::DATA) currentMode.reset(new DataMode(relationalWriter));
				else throw std::logic_error("Unsupported mode: " + std::to_string((int) rc.mode));
				break;
			}
		}

		if (currentMode) currentMode->startRelation(name, attributes);
		else relationalWriter->startRelation(name, toWriterMetadata(attributes), true);
	}

	void attribute(const string_t& value) override {
		if (currentMode) currentMode->attribute(value);
		else relationalWriter->writeAttribute(value);
	}

	void endOfPipe() {
		currentMode.reset();
	}

};

}
}
}