//
// Timespan.h
//
// Library: Foundation
// Package: DateTime
// Module:  Timespan
//
// Definition of the Timespan class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Timespan_INCLUDED
#define Foundation_Timespan_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Timestamp.h"
#include <chrono>


namespace Poco {


class Foundation_API Timespan
	/// A class that represents time spans up to microsecond resolution.
{
public:
	using TimeDiff = Timestamp::TimeDiff;

	Timespan();
		/// Creates a zero Timespan.

	Timespan(TimeDiff microseconds);
		/// Creates a Timespan.

	Timespan(long seconds, long microseconds);
		/// Creates a Timespan. Useful for creating
		/// a Timespan from a struct timeval.

	Timespan(int days, int hours, int minutes, int seconds, int microSeconds);
		/// Creates a Timespan.

	Timespan(const Timespan& timespan);
		/// Creates a Timespan from another one.

	template <class T, class Period>
	Timespan(const std::chrono::duration<T, Period>& dtime) :
		_span(std::chrono::duration_cast<std::chrono::microseconds>(dtime).count()) {}
		/// Creates a Timespan from std::chrono::duration

	~Timespan();
		/// Destroys the Timespan.

	Timespan& operator = (const Timespan& timespan);
		/// Assignment operator.

	Timespan& operator = (TimeDiff microseconds);
		/// Assignment operator.

	Timespan& assign(int days, int hours, int minutes, int seconds, int microSeconds);
		/// Assigns a new span.

	Timespan& assign(long seconds, long microseconds);
		/// Assigns a new span. Useful for assigning
		/// from a struct timeval.

	template <class T, class Period>
	Timespan& assign(const std::chrono::duration<T, Period>& dtime)
		/// Assigns a new span from std::chrono::duration.
	{
		_span = std::chrono::duration_cast<std::chrono::microseconds>(dtime).count();
		return *this;
	}

	void swap(Timespan& timespan) noexcept;
		/// Swaps the Timespan with another one.

	bool operator == (const Timespan& ts) const;
	bool operator != (const Timespan& ts) const;
	bool operator >  (const Timespan& ts) const;
	bool operator >= (const Timespan& ts) const;
	bool operator <  (const Timespan& ts) const;
	bool operator <= (const Timespan& ts) const;

	bool operator == (TimeDiff microSeconds) const;
	bool operator != (TimeDiff microSeconds) const;
	bool operator >  (TimeDiff microSeconds) const;
	bool operator >= (TimeDiff microSeconds) const;
	bool operator <  (TimeDiff microSeconds) const;
	bool operator <= (TimeDiff microSeconds) const;

	Timespan operator + (const Timespan& d) const;
	Timespan operator - (const Timespan& d) const;
	Timespan& operator += (const Timespan& d);
	Timespan& operator -= (const Timespan& d);

	Timespan operator + (TimeDiff microSeconds) const;
	Timespan operator - (TimeDiff microSeconds) const;
	Timespan& operator += (TimeDiff microSeconds);
	Timespan& operator -= (TimeDiff microSeconds);

	int days() const;
		/// Returns the number of days.

	int hours() const;
		/// Returns the number of hours (0 to 23).

	int totalHours() const;
		/// Returns the total number of hours.

	int minutes() const;
		/// Returns the number of minutes (0 to 59).

	int totalMinutes() const;
		/// Returns the total number of minutes.

	int seconds() const;
		/// Returns the number of seconds (0 to 59).

	int totalSeconds() const;
		/// Returns the total number of seconds.

	int milliseconds() const;
		/// Returns the number of milliseconds (0 to 999).

	TimeDiff totalMilliseconds() const;
		/// Returns the total number of milliseconds.

	int microseconds() const;
		/// Returns the fractions of a millisecond
		/// in microseconds (0 to 999).

	int useconds() const;
		/// Returns the fractions of a second
		/// in microseconds (0 to 999999).

	TimeDiff totalMicroseconds() const;
		/// Returns the total number of microseconds.

	static const TimeDiff MILLISECONDS; /// The number of microseconds in a millisecond.
	static const TimeDiff SECONDS;      /// The number of microseconds in a second.
	static const TimeDiff MINUTES;      /// The number of microseconds in a minute.
	static const TimeDiff HOURS;        /// The number of microseconds in a hour.
	static const TimeDiff DAYS;         /// The number of microseconds in a day.

private:
	TimeDiff _span;
};


//
// inlines
//
inline int Timespan::days() const
{
	return int(_span/DAYS);
}


inline int Timespan::hours() const
{
	return int((_span/HOURS) % 24);
}


inline int Timespan::totalHours() const
{
	return int(_span/HOURS);
}


inline int Timespan::minutes() const
{
	return int((_span/MINUTES) % 60);
}


inline int Timespan::totalMinutes() const
{
	return int(_span/MINUTES);
}


inline int Timespan::seconds() const
{
	return int((_span/SECONDS) % 60);
}


inline int Timespan::totalSeconds() const
{
	return int(_span/SECONDS);
}


inline int Timespan::milliseconds() const
{
	return int((_span/MILLISECONDS) % 1000);
}


inline Timespan::TimeDiff Timespan::totalMilliseconds() const
{
	return _span/MILLISECONDS;
}


inline int Timespan::microseconds() const
{
	return int(_span % 1000);
}


inline int Timespan::useconds() const
{
	return int(_span % 1000000);
}


inline Timespan::TimeDiff Timespan::totalMicroseconds() const
{
	return _span;
}


inline bool Timespan::operator == (const Timespan& ts) const
{
	return _span == ts._span;
}


inline bool Timespan::operator != (const Timespan& ts) const
{
	return _span != ts._span;
}


inline bool Timespan::operator >  (const Timespan& ts) const
{
	return _span > ts._span;
}


inline bool Timespan::operator >= (const Timespan& ts) const
{
	return _span >= ts._span;
}


inline bool Timespan::operator <  (const Timespan& ts) const
{
	return _span < ts._span;
}


inline bool Timespan::operator <= (const Timespan& ts) const
{
	return _span <= ts._span;
}


inline bool Timespan::operator == (TimeDiff microSeconds) const
{
	return _span == microSeconds;
}


inline bool Timespan::operator != (TimeDiff microSeconds) const
{
	return _span != microSeconds;
}


inline bool Timespan::operator >  (TimeDiff microSeconds) const
{
	return _span > microSeconds;
}


inline bool Timespan::operator >= (TimeDiff microSeconds) const
{
	return _span >= microSeconds;
}


inline bool Timespan::operator <  (TimeDiff microSeconds) const
{
	return _span < microSeconds;
}


inline bool Timespan::operator <= (TimeDiff microSeconds) const
{
	return _span <= microSeconds;
}


inline void swap(Timespan& s1, Timespan& s2) noexcept
{
	s1.swap(s2);
}

inline Timespan::~Timespan() = default;

} // namespace Poco


#endif // Foundation_Timespan_INCLUDED
