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/*
 * Copyright © 2008 Dennis Kasprzyk
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of
 * Dennis Kasprzyk not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 * Dennis Kasprzyk makes no representations about the suitability of this
 * software for any purpose. It is provided "as is" without express or
 * implied warranty.
 *
 * DENNIS KASPRZYK DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL DENNIS KASPRZYK BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Authors: Dennis Kasprzyk <onestone@compiz-fusion.org>
 */

#include <core/timer.h>
#include <core/screen.h>
#include "privatescreen.h"

CompTimeoutSource::CompTimeoutSource () :
    Glib::Source ()
{
    struct timespec ts;

    clock_gettime (CLOCK_MONOTONIC, &ts);

    mLastTimeout = ts;

    set_priority (G_PRIORITY_HIGH);
    attach (screen->priv->ctx);
    connect (sigc::mem_fun <bool, CompTimeoutSource> (this, &CompTimeoutSource::callback));
}

CompTimeoutSource::~CompTimeoutSource ()
{
}

sigc::connection
CompTimeoutSource::connect (const sigc::slot <bool> &slot)
{
    return connect_generic (slot);
}

Glib::RefPtr <CompTimeoutSource>
CompTimeoutSource::create ()
{
    return Glib::RefPtr <CompTimeoutSource> (new CompTimeoutSource ());
}

#define COMPIZ_TIMEOUT_WAIT 15

bool
CompTimeoutSource::prepare (int &timeout)
{
    struct timespec ts;

    clock_gettime (CLOCK_MONOTONIC, &ts);

    /* Determine time to wait */

    if (screen->priv->timers.empty ())
    {
	/* This kind of sucks, but we have to do it, considering
	 * that glib provides us no safe way to remove the source -
	 * thankfully we shouldn't ever be hitting this case since
	 * we create the source after we start pingTimer
	 * and that doesn't stop until compiz does
	 */

	timeout = COMPIZ_TIMEOUT_WAIT;
	return true;
    }

    if (screen->priv->timers.front ()->mMinLeft > 0)
    {
	std::list<CompTimer *>::iterator it = screen->priv->timers.begin ();

	CompTimer *t = (*it);
	timeout = t->mMaxLeft;
	while (it != screen->priv->timers.end ())
	{
	    t = (*it);
	    if (t->mMinLeft >= timeout)
		break;
	    if (t->mMaxLeft < timeout)
		timeout = t->mMaxLeft;
	    it++;
	}

	mLastTimeout = ts;
	return false;
    }
    else
    {
	mLastTimeout = ts;
	timeout = 0;
	return true;
    }
}

bool
CompTimeoutSource::check ()
{
    struct timespec ts;
    int		    timeDiff;

    clock_gettime (CLOCK_MONOTONIC, &ts);
    timeDiff = TIMESPECDIFF (&ts, &mLastTimeout);

    if (timeDiff < 0)
	timeDiff = 0;

    foreach (CompTimer *t, screen->priv->timers)
    {
	t->mMinLeft -= timeDiff;
	t->mMaxLeft -= timeDiff;
    }

    return screen->priv->timers.front ()->mMinLeft <= 0;
}

bool
CompTimeoutSource::dispatch (sigc::slot_base *slot)
{
    (*static_cast <sigc::slot <bool> *> (slot)) ();

    return true;
}

bool
CompTimeoutSource::callback ()
{
    while (screen->priv->timers.begin () != screen->priv->timers.end () &&
	   screen->priv->timers.front ()->mMinLeft <= 0)
    {
	CompTimer *t = screen->priv->timers.front ();
	screen->priv->timers.pop_front ();

	t->mActive = false;
	if (t->mCallBack ())
	{
	    screen->priv->addTimer (t);
	    t->mActive = true;
	}
    }

    return !screen->priv->timers.empty ();
}

CompTimer::CompTimer () :
    mActive (false),
    mMinTime (0),
    mMaxTime (0),
    mMinLeft (0),
    mMaxLeft (0),
    mCallBack (NULL)
{
}

CompTimer::~CompTimer ()
{
    screen->priv->removeTimer (this);
}

void
CompTimer::setTimes (unsigned int min, unsigned int max)
{
    bool wasActive = mActive;
    if (mActive)
	stop ();
    mMinTime = min;
    mMaxTime = (min <= max)? max : min;

    if (wasActive)
	start ();
}

void
CompTimer::setCallback (CompTimer::CallBack callback)
{
    bool wasActive = mActive;
    if (mActive)
	stop ();

    mCallBack = callback;

    if (wasActive)
	start ();
}


void
CompTimer::start ()
{
    stop ();

    if (mCallBack.empty ())
    {
	compLogMessage ("core", CompLogLevelWarn,
			"Attempted to start timer without callback.");
	return;
    }

    mActive = true;
    screen->priv->addTimer (this);
}

void
CompTimer::start (unsigned int min, unsigned int max)
{
    stop ();
    setTimes (min, max);
    start ();
}

void
CompTimer::start (CompTimer::CallBack callback,
		  unsigned int min, unsigned int max)
{
    stop ();
    setTimes (min, max);
    setCallback (callback);
    start ();
}

void
CompTimer::stop ()
{
    mActive = false;
    screen->priv->removeTimer (this);
}

unsigned int
CompTimer::minTime ()
{
    return mMinTime;
}

unsigned int
CompTimer::maxTime ()
{
    return mMaxTime;
}

unsigned int
CompTimer::minLeft ()
{
    return (mMinLeft < 0)? 0 : mMinLeft;
}

unsigned int
CompTimer::maxLeft ()
{
    return (mMaxLeft < 0)? 0 : mMaxLeft;
}

bool
CompTimer::active ()
{
    return mActive;
}