/**

 * Relational pipes

 * Copyright © 2019 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

 *

 * 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 <string>

#include <vector>

#include <iostream>

#include <sstream>

#include <locale>

#include <codecvt>

#include <regex>

#include <cassert>

#include <relpipe/reader/typedefs.h>

#include <relpipe/reader/TypeId.h>

#include <relpipe/reader/handlers/RelationalReaderValueHandler.h>

#include <relpipe/reader/handlers/AttributeMetadata.h>

#include "ASN1Writer.h"

namespace relpipe {

namespace out {

namespace asn1 {

using namespace relpipe::reader;

class ASN1Handler : public handlers::RelationalReaderValueHandler {

private:

	shared_ptr<ASN1Writer> asn1Writer;

	std::vector<TypeId> columnTypes;

	std::vector<string_t> columnTypeCodes;

	std::vector<string_t> columnNames;

	integer_t valueCount = 0;

	integer_t columnCount = 0;

	integer_t relationCount = 0;

public:

	ASN1Handler(std::ostream& output) : asn1Writer(new ASN1Writer(output)) {

	}

	void startRelation(string_t name, std::vector<handlers::AttributeMetadata> attributes) override {

		valueCount = 0;

		columnCount = 0;

		if (relationCount == 0) {

			asn1Writer->writeStartSequence(); // root

		} else {

			asn1Writer->writeEndSequence();

			asn1Writer->writeEndSequence();

		}

		relationCount++;

		asn1Writer->writeStartSequence(); // relation

		asn1Writer->writeString(name);

		asn1Writer->writeStartSequence(); // relation metadata

		columnCount = attributes.size();

		columnTypes.resize(columnCount);

		columnTypeCodes.resize(columnCount);

		columnNames.resize(columnCount);

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

			columnNames[i] = attributes[i].getAttributeName();

			columnTypes[i] = attributes[i].getTypeId();

			columnTypeCodes[i] = attributes[i].getTypeName();

			asn1Writer->writeStartSequence(); // attribute-metadata

			asn1Writer->writeString(columnNames[i]);

			asn1Writer->writeString(columnTypeCodes[i]);

			asn1Writer->writeEndSequence();

		}

		asn1Writer->writeEndSequence();

	}

	void attribute(const void* value, const std::type_info& type) override {

		integer_t i = valueCount % columnCount;

		if (i == 0 && valueCount) asn1Writer->writeEndSequence();

		if (i == 0) asn1Writer->writeStartSequence();

		valueCount++;

		switch (columnTypes[i]) {

			case TypeId::BOOLEAN:

			{

				assert(type == typeid (boolean_t));

				auto* typedValue = static_cast<const boolean_t*> (value);

				asn1Writer->writeBoolean(*typedValue);

				break;

			}

			case TypeId::INTEGER:

			{

				assert(type == typeid (integer_t));

				auto* typedValue = static_cast<const integer_t*> (value);

				asn1Writer->writeInteger(*typedValue);

				break;

			}

			case TypeId::STRING:

			{

				assert(type == typeid (string_t));

				auto* typedValue = static_cast<const string_t*> (value);

				asn1Writer->writeString(*typedValue);

				break;

			}

			default:

				throw cli::RelpipeCLIException(L"Unsupported type in ASN1Handler.attribute()", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR);

		}

	}

	void endOfPipe() {

		if (valueCount) asn1Writer->writeEndSequence();

		if (relationCount) asn1Writer->writeEndSequence();

		asn1Writer->writeEndSequence();

		asn1Writer->end();

	}

};

}

}

}