//! \~english Unit prefixes
//! \~russian Префиксы единиц измерения
/*
    PIP - Platform Independent Primitives
    Unit prefix
    Ivan Pelipenko peri4ko@yandex.ru

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef PIUNITS_PREFIX_H
#define PIUNITS_PREFIX_H

#include "pistring.h"

namespace PIUnits {

//! \~english Unit prefix class
//! \~russian Класс префикса единиц
class PIP_EXPORT Prefix {
	friend class Value;

public:
	//! \~english Prefix values
	//! \~russian Значения префиксов
	enum {
		None, //!< No prefix

		Deca = 0x100, //!< da	10^1 	10
		Hecto,        //!< h 	10^2 	100
		Kilo,         //!< k 	10^3 	1000
		Mega,         //!< M 	10^6 	1000000
		Giga,         //!< G 	10^9 	1000000000
		Tera,         //!< T 	10^12 	1000000000000
		Peta,         //!< P 	10^15 	1000000000000000
		Exa,          //!< E 	10^18 	1000000000000000000
		Zetta,        //!< Z 	10^21 	1000000000000000000000
		Yotta,        //!< Y 	10^24 	1000000000000000000000000
		Ronna,        //!< R 	10^27 	1000000000000000000000000000
		Quetta,       //!< Q 	10^30 	1000000000000000000000000000000

		Deci = 0x200, //!< d 	10^−1 	0.1
		Centi,        //!< c 	10^−2 	0.01
		Milli,        //!< m 	10^−3 	0.001
		Micro,        //!< μ 	10^−6 	0.000001
		Nano,         //!< n 	10^−9 	0.000000001
		Pico,         //!< p 	10^−12 	0.000000000001
		Femto,        //!< f 	10^−15 	0.000000000000001
		Atto,         //!< a 	10^−18 	0.000000000000000001
		Zepto,        //!< z 	10^−21 	0.000000000000000000001
		Yocto,        //!< y 	10^−24 	0.000000000000000000000001
		Ronto,        //!< r 	10^−27 	0.000000000000000000000000001
	};

	//! \~english Get prefix name
	//! \~russian Получить имя префикса
	//! \param prefix Prefix value
	//! \return Prefix name
	static PIString name(int prefix);

	//! \~english Get prefix symbol
	//! \~russian Получить символ префикса
	//! \param prefix Prefix value
	//! \return Prefix symbol
	static PIString prefix(int prefix);

	//! \~english Get multiplier for prefix
	//! \~russian Получить множитель для префикса
	//! \param prefix Prefix value
	//! \return Multiplier value
	static double multiplier(int prefix);

private:
	Prefix();
	NO_COPY_CLASS(Prefix);
	static Prefix & instance();
	static PIString valueToString(double v, void * type_class, int type, char format = 'g', int prec = 5);

	//! \~english Prefix data structure
	//! \~russian Структура данных префикса
	struct P {
		PIString name;
		PIString prefix;
		int pow;
		double divider;
		bool non3;
	};

	//! \~english Get prefix by value
	//! \~russian Получить префикс по значению
	const P getPrefix(int p) const;

	//! \~english Get prefix for value
	//! \~russian Получить префикс для значения
	const P getPrefixForValue(double v, bool use_non3, bool use_greater, bool use_smaller) const;

	PIMap<int, P> prefixes;
	PIMap<int, P *> prefixes_by_pow;
	P def_prefix;
};

} // namespace PIUnits


#endif