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* libscopehal v0.1                                                                                                     *
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/**
	@file
	@author Andrew D. Zonenberg
	@brief Declaration of Unit
 */

#ifndef Unit_h
#define Unit_h

/**
	@brief A unit of measurement, plus conversion to pretty-printed output

	TODO: add scale factors too?
 */
class Unit
{
public:

	enum UnitType
	{
		UNIT_FS,			//Time. Note that this is not a SI base unit.
							//Using femtoseconds allows integer math for all known scope timebases,
							//which keeps things nice and simple.
		UNIT_HZ,			//Frequency
		UNIT_VOLTS,			//Voltage
		UNIT_AMPS,			//Current
		UNIT_OHMS,			//Resistance
		UNIT_BITRATE,		//Bits per second
		UNIT_PERCENT,		//Dimensionless ratio
		UNIT_DB,			//Dimensionless ratio
		UNIT_DBM,			//dB mW (more common than dBW)
		UNIT_COUNTS,		//Dimensionless ratio (histogram)
		UNIT_COUNTS_SCI,	//Dimensionless ratio (histogram, but scientific notation)
		UNIT_LOG_BER,		//Dimensionless ratio (log scale)
		UNIT_SAMPLERATE,	//Sample rate (Hz but displayed as S/s)
		UNIT_SAMPLEDEPTH,	//Memory depth (number of samples)
		UNIT_WATTS,			//Power
		UNIT_UI,			//Unit interval (relative to signal bit rate)
		UNIT_DEGREES,		//Angular degrees
		UNIT_RPM,			//Revolutions per minute
		UNIT_CELSIUS,		//Degrees Celsius

		UNIT_MILLIVOLTS,	//Hack needed for voltage in the X axis since we use integer coordinates there

		//TODO: more here
	};

	Unit(Unit::UnitType t)
	: m_type(t)
	{}

	std::string PrettyPrint(double value, int sigfigs = -1);
	double ParseString(const std::string& str);

	UnitType GetType()
	{ return m_type; }

	bool operator==(const Unit& rhs)
	{ return m_type == rhs.m_type; }

	bool operator!=(const Unit& rhs)
	{ return m_type != rhs.m_type; }

	bool operator!=(UnitType rhs)
	{ return m_type != rhs; }

	Unit operator*(const Unit& rhs);

protected:
	UnitType m_type;
};

#endif
