/**
 * 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);
};

}
}
}