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

    The animations are all started at the same time, and run in parallel. The animation group
    finishes when the longest lasting animation has finished.
*/

#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