/**

 * 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 <relpipe/writer/RelationalWriter.h>

#include <relpipe/writer/RelpipeWriterException.h>

#include "lib/ASN1ContentHandler.h"

#include "Configuration.h"

namespace relpipe {

namespace in {

namespace asn1 {

class RelpipeASN1ContentHandler : public lib::ASN1ContentHandler {

private:

	wstring_convert < codecvt_utf8<wchar_t>> convertor; // ASN.1 parser works with UTF-8

	std::shared_ptr<relpipe::writer::RelationalWriter> writer;

	Configuration configuration;

	relpipe::common::type::StringX currentRelationName;

	std::vector<relpipe::writer::AttributeMetadata> currentAttributes;

	enum class State {

		Start,

		Relation,

		RelationName,

		Header,

		HeaderItem,

		AttributeName,

		AttributeType,

		Records,

		Record,

	};

	State state = State::Start;

	void assertTag(const Header& header, uint64_t expectedTag, TagClass expectedClass = TagClass::Universal) {

		if (header.tagClass != expectedClass || header.tag != expectedTag) throw relpipe::writer::RelpipeWriterException(L"Unexpected tag."); // TODO: add actual vs. expected values

	}

public:

	RelpipeASN1ContentHandler(std::shared_ptr<relpipe::writer::RelationalWriter> writer, Configuration configuration) : writer(writer), configuration(configuration) {

	}

	bool setOption(const std::string& uri, const std::string& value) override {

		return false;

	}

	void writeStreamStart() override {

	}

	void writeStreamEnd() override {

	}

	void writeCollectionStart(const Header& header) override {

		assertTag(header, lib::UniversalType::Sequence);

		if (state == State::Start) state = State::Relation;

		else if (state == State::Relation) state = State::RelationName;

		else if (state == State::Header) state = State::HeaderItem;

		else if (state == State::HeaderItem) state = State::AttributeName;

		else if (state == State::Records) state = State::Record;

	}

	void writeCollectionEnd() override {

		else if (state == State::Records) state = State::Relation;

	}

	void writeBitString(const Header& header, std::vector<bool> value) override {

	}

	void writeBoolean(const Header& header, bool value) override {

		if (state == State::Record) writer->writeAttribute(&value, typeid (value));

	}

	void writeDateTime(const Header& header, DateTime value) override {

	}

	void writeInteger(const Header& header, Integer value) override {

		relpipe::common::type::Integer integer = value.toInt64();

		if (state == State::Record) writer->writeAttribute(&integer, typeid (integer));

	}

	void writeNull(const Header& header) override {

	}

	void writeOID(const Header& header, ObjectIdentifier value) override {

	}

	void writeOctetString(const Header& header, std::string value) override {

	}

	void writeTextString(const Header& header, std::string value) override {

		assertTag(header, lib::UniversalType::UTF8String);

		relpipe::common::type::StringX str = convertor.from_bytes(value);

	}

	void writeSpecific(const Header& header, std::string value) override {

	}

};

}

}

}