/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * 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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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef DocumentTimeline_h
#define DocumentTimeline_h

#include "core/animation/AnimationEffect.h"
#include "core/animation/Player.h"
#include "core/dom/Element.h"
#include "core/events/Event.h"
#include "platform/Timer.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"

namespace WebCore {

class Document;
class TimedItem;

// DocumentTimeline is constructed and owned by Document, and tied to its lifecycle.
class DocumentTimeline : public RefCounted<DocumentTimeline> {
public:
    class PlatformTiming {

    public:
        // Calls DocumentTimeline's wake() method after duration seconds.
        virtual void wakeAfter(double duration) = 0;
        virtual void cancelWake() = 0;
        virtual void serviceOnNextFrame() = 0;
        virtual ~PlatformTiming() { }

    };

    static PassRefPtr<DocumentTimeline> create(Document*, PassOwnPtr<PlatformTiming> = nullptr);
    // Returns whether style recalc was triggered.
    bool serviceAnimations();

    // Creates a player attached to this timeline, but without a start time.
    Player* createPlayer(TimedItem*);
    Player* play(TimedItem*);

    // Called from setReadyState() in Document.cpp to set m_zeroTime to
    // performance.timing.domInteractive
    void setZeroTime(double);
    bool hasStarted() const { return !isNull(m_zeroTime); }
    double zeroTime() const { return m_zeroTime; }
    double currentTime();
    void pauseAnimationsForTesting(double);
    size_t numberOfActiveAnimationsForTesting() const;
    const Vector<RefPtr<Player> >& players() const { return m_players; }

    void addEventToDispatch(EventTarget* target, PassRefPtr<Event> event)
    {
        m_events.append(EventToDispatch(target, event));
    }

    void dispatchEvents();
    void dispatchEventsAsync();

protected:
    DocumentTimeline(Document*, PassOwnPtr<PlatformTiming>);

private:
    double m_zeroTime;
    Document* m_document;
    Timer<DocumentTimeline> m_eventDistpachTimer;
    Vector<RefPtr<Player> > m_players;

    void eventDispatchTimerFired(Timer<DocumentTimeline>*);
    void wake();

    struct EventToDispatch {
        EventToDispatch(EventTarget* target, PassRefPtr<Event> event)
            : target(target)
            , event(event)
        {
        }
        RefPtr<EventTarget> target;
        RefPtr<Event> event;
    };
    Vector<EventToDispatch> m_events;

    static const double s_minimumDelay;

    OwnPtr<PlatformTiming> m_timing;

    class DocumentTimelineTiming : public PlatformTiming {
    public:
        DocumentTimelineTiming(DocumentTimeline* documentTimeline)
            : m_timeline(documentTimeline)
            , m_timer(this, &DocumentTimelineTiming::timerFired)
        {
            ASSERT(m_timeline);
        }

        virtual void wakeAfter(double duration) OVERRIDE;
        virtual void cancelWake() OVERRIDE;
        virtual void serviceOnNextFrame() OVERRIDE;

        void timerFired(Timer<DocumentTimelineTiming>*) { m_timeline->wake(); }

    private:
        DocumentTimeline* m_timeline;
        Timer<DocumentTimelineTiming> m_timer;

    };

    friend class AnimationDocumentTimelineTest;
};

} // namespace

#endif