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/*!
    \class QParallelAnimationGroup
    \brief The QParallelAnimationGroup class provides a parallel group of animations.
    \since 4.5
    \ingroup animation
    \preliminary

    QParallelAnimationGroup--a \l{QAnimationGroup}{container for
    animations}--starts all its animations when it is
    \l{QAbstractAnimation::start()}{started} itself, i.e., runs all
    animations in parallel. The animation group finishes when the
    longest lasting animation has finished.

    You can treat QParallelAnimation as any other QAbstractAnimation,
    e.g., pause, resume, or add it to other animation groups.

    \code
        QParallelAnimationGroup *group = new QParallelAnimationGroup;
        group->addAnimation(anim1);
        group->addAnimation(anim2);

        group->start();
    \endcode
    
    In this example, \c anim1 and \c anim2 are two
    \l{QPropertyAnimation}s that have already been set up.

    \sa QAnimationGroup, QPropertyAnimation, {The Animation Framework}
*/

#ifndef QT_NO_ANIMATION

#include "qparallelanimationgroup.h"
#include "qparallelanimationgroup_p.h"
//#define QANIMATION_DEBUG
QT_BEGIN_NAMESPACE

/*!
    Constructs a QParallelAnimationGroup.
    \a parent is passed to QObject's constructor.
*/
QParallelAnimationGroup::QParallelAnimationGroup(QObject *parent)
    : QAnimationGroup(*new QParallelAnimationGroupPrivate, parent)
{
}

/*!
    \internal
*/
QParallelAnimationGroup::QParallelAnimationGroup(QParallelAnimationGroupPrivate &dd,
                                                 QObject *parent)
    : QAnimationGroup(dd, parent)
{
}

/*!
    Destroys the animation group. It will also destroy all its animations.
*/
QParallelAnimationGroup::~QParallelAnimationGroup()
{
}

/*!
    \reimp
*/
int QParallelAnimationGroup::duration() const
{
    Q_D(const QParallelAnimationGroup);
    int ret = 0;

    for (int i = 0; i < d->animations.size(); ++i) {
        QAbstractAnimation *animation = d->animations.at(i);
        const int currentDuration = animation->totalDuration();
        if (currentDuration == -1)
            return -1; // Undetermined length

        ret = qMax(ret, currentDuration);
    }

    return ret;
}

/*!
    \reimp
*/
void QParallelAnimationGroup::updateCurrentTime(int)
{
    Q_D(QParallelAnimationGroup);
    if (d->animations.isEmpty())
        return;

    if (d->currentLoop > d->lastLoop) {
        // simulate completion of the loop
        int dura = duration();
        if (dura > 0) {
            foreach (QAbstractAnimation *animation, d->animations) {
                animation->setCurrentTime(dura);   // will stop
            }
        }
    } else if (d->currentLoop < d->lastLoop) {
        // simulate completion of the loop seeking backwards
        foreach (QAbstractAnimation *animation, d->animations) {
            animation->setCurrentTime(0);
            animation->stop();
        }
    }

    bool timeFwd = ((d->currentLoop == d->lastLoop && d->currentTime >= d->lastCurrentTime)
                   || d->currentLoop > d->lastLoop);
#ifdef QANIMATION_DEBUG
    qDebug("QParallellAnimationGroup %5d: setCurrentTime(%d), loop:%d, last:%d, timeFwd:%d, lastcurrent:%d, %d",
        __LINE__, d->currentTime, d->currentLoop, d->lastLoop, timeFwd, d->lastCurrentTime, state());
#endif
    // finally move into the actual time of the current loop
    foreach (QAbstractAnimation *animation, d->animations) {
        const int dura = animation->totalDuration();
        if (dura == -1 && d->isUncontrolledAnimationFinished(animation))
            continue;
        if (dura == -1 || (d->currentTime <= dura && dura != 0)
            || (dura == 0 && d->currentLoop != d->lastLoop)) {
            switch (state()) {
            case Running:
                animation->start();
                break;
            case Paused:
                animation->pause();
                break;
            case Stopped:
            default:
                break;
            }
        }

        if (dura <= 0) {
            if (dura == -1)
                animation->setCurrentTime(d->currentTime);
            continue;
        }

        if ((timeFwd && d->lastCurrentTime <= dura)
            || (!timeFwd && d->currentTime <= dura))
                animation->setCurrentTime(d->currentTime);
        if (d->currentTime > dura)
            animation->stop();
    }
    d->lastLoop = d->currentLoop;
    d->lastCurrentTime = d->currentTime;
}

/*!
    \reimp
*/
void QParallelAnimationGroup::updateState(QAbstractAnimation::State oldState,
                                          QAbstractAnimation::State newState)
{
    Q_D(QParallelAnimationGroup);
    QAnimationGroup::updateState(oldState, newState);

    switch (newState) {
    case Stopped:
        foreach (QAbstractAnimation *animation, d->animations)
            animation->stop();
        d->disconnectUncontrolledAnimations();
        break;
    case Paused:
        foreach (QAbstractAnimation *animation, d->animations)
            animation->pause();
        break;
    case Running:
        d->connectUncontrolledAnimations();
        foreach (QAbstractAnimation *animation, d->animations) {
            animation->stop();
            animation->setDirection(d->direction);
            animation->start();
        }
        break;
    }
}

void QParallelAnimationGroupPrivate::_q_uncontrolledAnimationFinished()
{
    Q_Q(QParallelAnimationGroup);

    QAbstractAnimation *animation = qobject_cast<QAbstractAnimation *>(q->sender());
    Q_ASSERT(animation);

    int uncontrolledRunningCount = 0;
    if (animation->duration() == -1 || animation->loopCount() < 0) {
        QHash<QAbstractAnimation *, int>::iterator it = uncontrolledFinishTime.begin();
        while (it != uncontrolledFinishTime.end()) {
            if (it.key() == animation) {
                *it = animation->currentTime();
            }
            if (it.value() == -1)
                ++uncontrolledRunningCount;
            ++it;
        }
    }

    if (uncontrolledRunningCount > 0)
        return;

    int maxDuration = 0;
    foreach (QAbstractAnimation *a, animations)
        maxDuration = qMax(maxDuration, a->totalDuration());

    if (currentTime >= maxDuration)
        q->stop();
}

void QParallelAnimationGroupPrivate::disconnectUncontrolledAnimations()
{
    Q_Q(QParallelAnimationGroup);

    QHash<QAbstractAnimation *, int>::iterator it = uncontrolledFinishTime.begin();
    while (it != uncontrolledFinishTime.end()) {
        QObject::disconnect(it.key(), SIGNAL(finished()), q, SLOT(_q_uncontrolledAnimationFinished()));
        ++it;
    }

    uncontrolledFinishTime.clear();
}

void QParallelAnimationGroupPrivate::connectUncontrolledAnimations()
{
    Q_Q(QParallelAnimationGroup);

    foreach (QAbstractAnimation *animation, animations) {
        if (animation->duration() == -1 || animation->loopCount() < 0) {
            uncontrolledFinishTime[animation] = -1;
            QObject::connect(animation, SIGNAL(finished()), q, SLOT(_q_uncontrolledAnimationFinished()));
        }
    }
}

bool QParallelAnimationGroupPrivate::isUncontrolledAnimationFinished(QAbstractAnimation *anim) const
{
    return uncontrolledFinishTime.value(anim, -1) >= 0;
}

/*!
    \reimp
*/
void QParallelAnimationGroup::updateDirection(QAbstractAnimation::Direction direction)
{
    Q_D(QParallelAnimationGroup);
    //we need to update the direction of the current animation
    if (state() != Stopped) {
        foreach(QAbstractAnimation *anim, d->animations) {
            anim->setDirection(direction);
        }
    } else {
        if (direction == Forward) {
            d->lastLoop = 0;
            d->lastCurrentTime = 0;
        } else {
            // Looping backwards with loopCount == -1 does not really work well...
            d->lastLoop = (d->loopCount == -1 ? 0 : d->loopCount - 1);
            d->lastCurrentTime = duration();
        }
    }
}

/*!
    \reimp
*/
bool QParallelAnimationGroup::event(QEvent *event)
{
    return QAnimationGroup::event(event);
}

QT_END_NAMESPACE

#include "moc_qparallelanimationgroup.cpp"

#endif //QT_NO_ANIMATION