/*
 * 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.
 *
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#ifndef Timing_h
#define Timing_h

#include "core/style/DataEquivalency.h"
#include "platform/animation/CompositorAnimation.h"
#include "platform/animation/TimingFunction.h"
#include "wtf/Allocator.h"
#include "wtf/MathExtras.h"
#include "wtf/RefPtr.h"

namespace blink {

struct Timing {
  USING_FAST_MALLOC(Timing);

 public:
  using FillMode = CompositorAnimation::FillMode;
  using PlaybackDirection = CompositorAnimation::Direction;

  static String fillModeString(FillMode);
  static String playbackDirectionString(PlaybackDirection);

  static const Timing& defaults() {
    DEFINE_STATIC_LOCAL(Timing, timing, ());
    return timing;
  }

  Timing()
      : startDelay(0),
        endDelay(0),
        fillMode(FillMode::AUTO),
        iterationStart(0),
        iterationCount(1),
        iterationDuration(std::numeric_limits<double>::quiet_NaN()),
        playbackRate(1),
        direction(PlaybackDirection::NORMAL),
        timingFunction(LinearTimingFunction::shared()) {}

  void assertValid() const {
    DCHECK(std::isfinite(startDelay));
    DCHECK(std::isfinite(endDelay));
    DCHECK(std::isfinite(iterationStart));
    DCHECK_GE(iterationStart, 0);
    DCHECK_GE(iterationCount, 0);
    DCHECK(std::isnan(iterationDuration) || iterationDuration >= 0);
    DCHECK(std::isfinite(playbackRate));
    DCHECK(timingFunction);
  }

  bool operator==(const Timing& other) const {
    return startDelay == other.startDelay && endDelay == other.endDelay &&
           fillMode == other.fillMode &&
           iterationStart == other.iterationStart &&
           iterationCount == other.iterationCount &&
           ((std::isnan(iterationDuration) &&
             std::isnan(other.iterationDuration)) ||
            iterationDuration == other.iterationDuration) &&
           playbackRate == other.playbackRate && direction == other.direction &&
           dataEquivalent(timingFunction.get(), other.timingFunction.get());
  }

  bool operator!=(const Timing& other) const { return !(*this == other); }

  double startDelay;
  double endDelay;
  FillMode fillMode;
  double iterationStart;
  double iterationCount;
  double iterationDuration;

  // TODO(crbug.com/630915) Remove playbackRate
  double playbackRate;
  PlaybackDirection direction;
  RefPtr<TimingFunction> timingFunction;
};

}  // namespace blink

#endif