/**

 * Relational pipes

 * Copyright © 2020 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.

 *

 * 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 <codecvt>

#include <locale>

#include <vector>

#include <relpipe/writer/typedefs.h>

#include <relpipe/writer/TypeId.h>

namespace relpipe {

namespace tr {

namespace sql {

class ResultSet {

public:

	class MetaData {

	public:

		class ColumnDescriptor {

		public:

			relpipe::writer::string_t name;

			relpipe::writer::TypeId type = relpipe::writer::TypeId::STRING;

		};

	private:

		unsigned short columnCount;

		std::vector<ColumnDescriptor> columnDescriptors;

	public:

		MetaData(unsigned short columnCount, std::vector<ColumnDescriptor> columnDescriptors);

		virtual ~MetaData();

		unsigned short getColumnCount();

		ColumnDescriptor describeColumn(unsigned short columnNumber);

		unsigned short getColumnNumber(relpipe::writer::string_t columnName);

	};

private:

	void* statement;

	std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings

public:

	ResultSet(void* statement);

	virtual ~ResultSet();

	MetaData* getMetaData();

	bool next();

	relpipe::writer::boolean_t getBoolean(unsigned short columnNumber, bool* isNull = nullptr);

	relpipe::writer::integer_t getInteger(unsigned short columnNumber, bool* isNull = nullptr);

	relpipe::writer::string_t getString(unsigned short columnNumber, bool* isNull = nullptr);

};

}

}

}