/*
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * Copyright (C) 2008-2010 Trinity <http://www.trinitycore.org/>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef TRINITY_TIMER_H
#define TRINITY_TIMER_H

#include "Platform/CompilerDefs.h"

#if PLATFORM == PLATFORM_WINDOWS
#   include <ace/config-all.h>
#   include <mmsystem.h>
#   include <time.h>
#else
# if defined(__APPLE_CC__)
#   include <time.h>
# endif
#   include <sys/time.h>
#   include <sys/timeb.h>
#endif

#if PLATFORM == PLATFORM_WINDOWS
inline uint32 getMSTime() { return GetTickCount(); }
#else
inline uint32 getMSTime()
{
    struct timeval tv;
    struct timezone tz;
    gettimeofday( &tv, &tz );
    return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
#endif

inline uint32 getMSTimeDiff(uint32 oldMSTime, uint32 newMSTime)
{
    // getMSTime() have limited data range and this is case when it overflow in this tick
    if (oldMSTime > newMSTime)
        return (0xFFFFFFFF - oldMSTime) + newMSTime;
    else
        return newMSTime - oldMSTime;
}

struct IntervalTimer
{
    public:

        IntervalTimer()
            : _interval(0), _current(0)
        {
        }

        void Update(time_t diff)
        {
            _current += diff;
            if (_current < 0)
                _current = 0;
        }

        bool Passed()
        {
            return _current >= _interval;
        }

        void Reset()
        {
            if (_current >= _interval)
                _current -= _interval;
        }

        void SetCurrent(time_t current)
        {
            _current = current;
        }

        void SetInterval(time_t interval)
        {
            _interval = interval;
        }

        time_t GetInterval() const
        {
            return _interval;
        }

        time_t GetCurrent() const
        {
            return _current;
        }

    private:

        time_t _interval;
        time_t _current;
};

struct TimeTracker
{
    public:

        TimeTracker(time_t expiry)
            : i_expiryTime(expiry)
        {
        }

        void Update(time_t diff)
        {
            i_expiryTime -= diff;
        }

        bool Passed() const
        {
            return i_expiryTime <= 0;
        }

        void Reset(time_t interval)
        {
            i_expiryTime = interval;
        }

        time_t GetExpiry() const
        {
            return i_expiryTime;
        }

    private:

        time_t i_expiryTime;
};

struct TimeTrackerSmall
{
    public:

        TimeTrackerSmall(uint32 expiry)
            : i_expiryTime(expiry)
        {
        }

        void Update(int32 diff)
        {
            i_expiryTime -= diff;
        }

        bool Passed() const
        {
            return i_expiryTime <= 0;
        }

        void Reset(uint32 interval)
        {
            i_expiryTime = interval;
        }

        int32 GetExpiry() const
        {
            return i_expiryTime;
        }

    private:

        int32 i_expiryTime;
};

struct PeriodicTimer
{
    public:

        PeriodicTimer(int32 period, int32 start_time)
            : i_expireTime(start_time), i_period(period)
        {
        }

        bool Update(const uint32 &diff)
        {
            if ((i_expireTime -= diff) > 0)
                return false;

            i_expireTime += i_period > diff ? i_period : diff;
            return true;
        }

        void SetPeriodic(int32 period, int32 start_time)
        {
            i_expireTime = start_time;
            i_period = period;
        }

        // Tracker interface
        void TUpdate(int32 diff) { i_expireTime -= diff; }
        bool TPassed() const { return i_expireTime <= 0; }
        void TReset(int32 diff, int32 period)  { i_expireTime += period > diff ? period : diff; }

    private:

        int32 i_period;
        int32 i_expireTime;
};

#endif