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#include "controller/SlsAnimator.hxx"
#include "view/SlideSorterView.hxx"
#include "View.hxx"
#include <boost/bind.hpp>

namespace sd { namespace slidesorter { namespace controller {

namespace {
    static const sal_Int32 gnResolution = 25;
}
/** Handle one animation function by using a timer for frequent calls to
    the animations operator().
*/
class Animator::Animation
{
public:
    Animation (
        const Animator::AnimationFunctor& rAnimation,
        const double nStartOffset,
        const double nDuration,
        const double nGlobalTime,
        const Animator::AnimationId nAnimationId,
        const Animator::FinishFunctor& rFinishFunctor);
    ~Animation (void);
    /** Run next animation step.  If animation has reached its end it is
        expired.
    */
    bool Run (const double nGlobalTime);

    /** Typically called when an animation has finished, but also from
        Animator::Disposed().  The finish functor is called and the
        animation is marked as expired to prevent another run.
    */
    void Expire (void);
    bool IsExpired (void);

    Animator::AnimationFunctor maAnimation;
    Animator::FinishFunctor maFinishFunctor;
    const Animator::AnimationId mnAnimationId;
    const double mnDuration;
    const double mnEnd;
    const double mnGlobalTimeAtStart;
    bool mbIsExpired;
};




Animator::Animator (SlideSorter& rSlideSorter)
    : mrSlideSorter(rSlideSorter),
      maTimer(),
      mbIsDisposed(false),
      maAnimations(),
      maElapsedTime(),
      mpDrawLock(),
      mnNextAnimationId(0)
{
    maTimer.SetTimeout(gnResolution);
    maTimer.SetTimeoutHdl(LINK(this,Animator,TimeoutHandler));
}




Animator::~Animator (void)
{
    if ( ! mbIsDisposed)
    {
        OSL_ASSERT(mbIsDisposed);
        Dispose();
    }
}




void Animator::Dispose (void)
{
    mbIsDisposed = true;

    AnimationList aCopy (maAnimations);
    AnimationList::const_iterator iAnimation;
    for (iAnimation=aCopy.begin(); iAnimation!=aCopy.end(); ++iAnimation)
        (*iAnimation)->Expire();

    maTimer.Stop();
    if (mpDrawLock)
    {
        mpDrawLock->Dispose();
        mpDrawLock.reset();
    }
}




Animator::AnimationId Animator::AddAnimation (
    const AnimationFunctor& rAnimation,
    const sal_Int32 nStartOffset,
    const sal_Int32 nDuration,
    const FinishFunctor& rFinishFunctor)
{
    // When the animator is already disposed then ignore this call
    // silently (well, we show an assertion, but do not throw an exception.)
    OSL_ASSERT( ! mbIsDisposed);
    if (mbIsDisposed)
        return -1;

    boost::shared_ptr<Animation> pAnimation (
        new Animation(
            rAnimation,
            nStartOffset / 1000.0,
            nDuration / 1000.0,
            maElapsedTime.getElapsedTime(),
            ++mnNextAnimationId,
            rFinishFunctor));
    maAnimations.push_back(pAnimation);

    RequestNextFrame();

    return pAnimation->mnAnimationId;
}




void Animator::RemoveAnimation (const Animator::AnimationId nId)
{
    OSL_ASSERT( ! mbIsDisposed);

    const AnimationList::iterator iAnimation (::std::find_if(
        maAnimations.begin(),
        maAnimations.end(),
        ::boost::bind(
            ::std::equal_to<Animator::AnimationId>(),
            nId,
            ::boost::bind(&Animation::mnAnimationId, _1))));
    if (iAnimation != maAnimations.end())
    {
        OSL_ASSERT((*iAnimation)->mnAnimationId == nId);
        (*iAnimation)->Expire();
        maAnimations.erase(iAnimation);
    }

    if (maAnimations.empty())
    {
        // Reset the animation id when we can.
        mnNextAnimationId = 0;

        // No more animations => we do not have to suppress painting
        // anymore.
        mpDrawLock.reset();
    }
}




void Animator::RemoveAllAnimations (void)
{
    ::std::for_each(
        maAnimations.begin(),
        maAnimations.end(),
        ::boost::bind(
            &Animation::Expire,
            _1));
    maAnimations.clear();
    mnNextAnimationId = 0;

    // No more animations => we do not have to suppress painting
    // anymore.
    mpDrawLock.reset();
}




bool Animator::ProcessAnimations (const double nTime)
{
    bool bExpired (false);

    OSL_ASSERT( ! mbIsDisposed);
    if (mbIsDisposed)
        return bExpired;


    AnimationList aCopy (maAnimations);
    AnimationList::const_iterator iAnimation;
    for (iAnimation=aCopy.begin(); iAnimation!=aCopy.end(); ++iAnimation)
    {
        bExpired |= (*iAnimation)->Run(nTime);
    }

    return bExpired;
}




void Animator::CleanUpAnimationList (void)
{
    OSL_ASSERT( ! mbIsDisposed);
    if (mbIsDisposed)
        return;

    AnimationList aActiveAnimations;

    AnimationList::const_iterator iAnimation;
    for (iAnimation=maAnimations.begin(); iAnimation!=maAnimations.end(); ++iAnimation)
    {
        if ( ! (*iAnimation)->IsExpired())
            aActiveAnimations.push_back(*iAnimation);
    }

    maAnimations.swap(aActiveAnimations);
}




void Animator::RequestNextFrame (const double nFrameStart)
{
    (void)nFrameStart;
    if ( ! maTimer.IsActive())
    {
        // Prevent redraws except for the ones in TimeoutHandler.  While the
        // Animator is active it will schedule repaints regularly.  Repaints
        // in between would only lead to visual artifacts.
        mpDrawLock.reset(new view::SlideSorterView::DrawLock(mrSlideSorter));
        maTimer.Start();
    }
}




IMPL_LINK(Animator, TimeoutHandler, Timer*, EMPTYARG)
{
    if (mbIsDisposed)
        return 0;

    if (ProcessAnimations(maElapsedTime.getElapsedTime()))
        CleanUpAnimationList();

    // Unlock the draw lock.  This should lead to a repaint.
    mpDrawLock.reset();

    if (!maAnimations.empty())
        RequestNextFrame();

    return 0;
}




//===== Animator::Animation ===================================================

Animator::Animation::Animation (
    const Animator::AnimationFunctor& rAnimation,
    const double nStartOffset,
    const double nDuration,
    const double nGlobalTime,
    const Animator::AnimationId nId,
    const Animator::FinishFunctor& rFinishFunctor)
    : maAnimation(rAnimation),
      maFinishFunctor(rFinishFunctor),
      mnAnimationId(nId),
      mnDuration(nDuration),
      mnEnd(nGlobalTime + nDuration + nStartOffset),
      mnGlobalTimeAtStart(nGlobalTime + nStartOffset),
      mbIsExpired(false)
{
    Run(nGlobalTime);
}




Animator::Animation::~Animation (void)
{
}




bool Animator::Animation::Run (const double nGlobalTime)
{
    if ( ! mbIsExpired)
    {
        if (mnDuration > 0)
        {
            if (nGlobalTime >= mnEnd)
            {
                maAnimation(1.0);
                Expire();
            }
            else if (nGlobalTime >= mnGlobalTimeAtStart)
            {
                maAnimation((nGlobalTime - mnGlobalTimeAtStart) / mnDuration);
            }
        }
        else if (mnDuration < 0)
        {
            // Animations without end have to be expired by their owner.
            maAnimation(nGlobalTime);
        }
    }

    return mbIsExpired;
}




void Animator::Animation::Expire (void)
{
    if ( ! mbIsExpired)
    {
        mbIsExpired = true;
        if (maFinishFunctor)
            maFinishFunctor();
    }
}




bool Animator::Animation::IsExpired (void)
{
    return mbIsExpired;
}




} } } // end of namespace ::sd::slidesorter::controller

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