/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#include "config.h"
#include "core/animation/CompositorPendingAnimations.h"

#include "core/animation/Animation.h"
#include "core/animation/AnimationTimeline.h"
#include "core/frame/FrameView.h"
#include "core/page/Page.h"
#include "core/rendering/RenderLayer.h"

namespace blink {

void CompositorPendingAnimations::add(AnimationPlayer* player)
{
    ASSERT(player);
    ASSERT(m_pending.find(player) == kNotFound);
    m_pending.append(player);

    Document* document = player->timeline()->document();
    if (document->view())
        document->view()->scheduleAnimation();

    bool visible = document->page() && document->page()->visibilityState() == PageVisibilityStateVisible;
    if (!visible && !m_timer.isActive()) {
        m_timer.startOneShot(0, FROM_HERE);
    }
}

bool CompositorPendingAnimations::update(bool startOnCompositor)
{
    Vector<AnimationPlayer*> waitingForStartTime;
    bool startedSynchronizedOnCompositor = false;

    WillBeHeapVector<RefPtrWillBeMember<AnimationPlayer> > players;
    players.swap(m_pending);

    for (size_t i = 0; i < players.size(); ++i) {
        AnimationPlayer& player = *players[i].get();
        bool hadCompositorAnimation = player.hasActiveAnimationsOnCompositor();
        player.preCommit(startOnCompositor);
        if (player.hasActiveAnimationsOnCompositor() && !hadCompositorAnimation) {
            startedSynchronizedOnCompositor = true;
        }

        if (player.playing() && !player.hasStartTime()) {
            waitingForStartTime.append(&player);
        }
    }

    // If any synchronized animations were started on the compositor, all
    // remaning synchronized animations need to wait for the synchronized
    // start time. Otherwise they may start immediately.
    if (startedSynchronizedOnCompositor) {
        for (size_t i = 0; i < waitingForStartTime.size(); ++i) {
            if (!waitingForStartTime[i]->hasStartTime()) {
                m_waitingForCompositorAnimationStart.append(waitingForStartTime[i]);
            }
        }
    } else {
        for (size_t i = 0; i < waitingForStartTime.size(); ++i) {
            if (!waitingForStartTime[i]->hasStartTime()) {
                waitingForStartTime[i]->notifyCompositorStartTime(waitingForStartTime[i]->timeline()->currentTimeInternal());
            }
        }
    }

    // FIXME: The postCommit should happen *after* the commit, not before.
    for (size_t i = 0; i < players.size(); ++i) {
        AnimationPlayer& player = *players[i].get();
        player.postCommit(player.timeline()->currentTimeInternal());
    }

    ASSERT(m_pending.isEmpty());

    if (startedSynchronizedOnCompositor)
        return true;

    if (m_waitingForCompositorAnimationStart.isEmpty())
        return false;

    // Check if we're still waiting for any compositor animations to start.
    for (size_t i = 0; i < m_waitingForCompositorAnimationStart.size(); ++i) {
        if (m_waitingForCompositorAnimationStart[i].get()->hasActiveAnimationsOnCompositor())
            return true;
    }

    // If not, go ahead and start any animations that were waiting.
    notifyCompositorAnimationStarted(monotonicallyIncreasingTime());

    ASSERT(m_pending.isEmpty());
    return false;
}

void CompositorPendingAnimations::notifyCompositorAnimationStarted(double monotonicAnimationStartTime)
{
    for (size_t i = 0; i < m_waitingForCompositorAnimationStart.size(); ++i) {
        AnimationPlayer* player = m_waitingForCompositorAnimationStart[i].get();
        if (player->hasStartTime())
            continue;
        player->notifyCompositorStartTime(monotonicAnimationStartTime - player->timeline()->zeroTime());
    }

    m_waitingForCompositorAnimationStart.clear();
}

void CompositorPendingAnimations::trace(Visitor* visitor)
{
    visitor->trace(m_pending);
    visitor->trace(m_waitingForCompositorAnimationStart);
}

} // namespace