/***************************************************************************
 *   Copyright (C) 2010 by Joris Guisson                                   *
 *   joris.guisson@gmail.com                                               *
 *                                                                         *
 *   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; either version 2 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 ***************************************************************************/

#ifndef UTP_TIMEVALUE_H
#define UTP_TIMEVALUE_H

#include <ktorrent_export.h>
#include <util/constants.h>

namespace utp
{
/**
    High precision time value
*/
class KTORRENT_EXPORT TimeValue
{
public:
    /// Default constructor, gets the current time
    TimeValue();
    TimeValue(bt::Uint64 secs, bt::Uint64 usecs);
    TimeValue(const TimeValue & tv);

    TimeValue & operator = (const TimeValue & tv);

    bt::Uint32 timestampMicroSeconds() const
    {
        bt::Uint64 microsecs = seconds * 1000000 + microseconds;
        //return microsecs & 0x00000000FFFFFFFF;
        return microsecs;
    }

    void addMilliSeconds(bt::Uint32 ms)
    {
        microseconds += ms * 1000;
        if (microseconds > 1000000) {
            seconds += microseconds / 1000000;
            microseconds = microseconds % 1000000;
        }
    }

    /// Convert to time stamp
    bt::TimeStamp toTimeStamp() const
    {
        return seconds * 1000 + (bt::Uint64)microseconds * 0.001;
    }

public:
    bt::Uint64 seconds;
    bt::Uint64 microseconds;
};


/// Calculate the a - b in milliseconds
inline bt::Int64 operator - (const TimeValue & a, const TimeValue & b)
{
    bt::Int64 seconds = a.seconds - b.seconds;
    bt::Int64 microseconds = a.microseconds - b.microseconds;

    while (microseconds < 0) {
        microseconds += 1000000;
        seconds -= 1;
    }

    return (1000000LL * seconds + microseconds) / 1000;
}

inline bool operator < (const TimeValue & a, const TimeValue & b)
{
    if (a.seconds < b.seconds)
        return true;
    else if (a.seconds == b.seconds)
        return a.microseconds < b.microseconds;
    else
        return false;
}

inline bool operator <= (const TimeValue & a, const TimeValue & b)
{
    if (a.seconds < b.seconds)
        return true;
    else if (a.seconds == b.seconds)
        return a.microseconds <= b.microseconds;
    else
        return false;
}

inline bool operator > (const TimeValue & a, const TimeValue & b)
{
    if (a.seconds > b.seconds)
        return true;
    else if (a.seconds == b.seconds)
        return a.microseconds > b.microseconds;
    else
        return false;
}

inline bool operator >= (const TimeValue & a, const TimeValue & b)
{
    if (a.seconds > b.seconds)
        return true;
    else if (a.seconds == b.seconds)
        return a.microseconds >= b.microseconds;
    else
        return false;
}

}

#endif // UTP_TIMEVALUE_H
