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#include "sky/engine/core/animation/TimingCalculations.h"

#include <gtest/gtest.h>

using namespace blink;

namespace {

TEST(AnimationTimingCalculationsTest, ActiveTime)
{
    Timing timing;

    // calculateActiveTime(activeDuration, fillMode, localTime, parentPhase, phase, timing)

    // Before Phase
    timing.startDelay = 10;
    EXPECT_TRUE(isNull(calculateActiveTime(20, Timing::FillModeForwards, 0, AnimationNode::PhaseActive, AnimationNode::PhaseBefore, timing)));
    EXPECT_TRUE(isNull(calculateActiveTime(20, Timing::FillModeNone, 0, AnimationNode::PhaseActive, AnimationNode::PhaseBefore, timing)));
    EXPECT_EQ(0, calculateActiveTime(20, Timing::FillModeBackwards, 0, AnimationNode::PhaseActive, AnimationNode::PhaseBefore, timing));
    EXPECT_EQ(0, calculateActiveTime(20, Timing::FillModeBoth, 0, AnimationNode::PhaseActive, AnimationNode::PhaseBefore, timing));

    // Active Phase
    timing.startDelay = 10;
    // Active, and parent Before
    EXPECT_TRUE(isNull(calculateActiveTime(20, Timing::FillModeNone, 15, AnimationNode::PhaseBefore, AnimationNode::PhaseActive, timing)));
    EXPECT_TRUE(isNull(calculateActiveTime(20, Timing::FillModeForwards, 15, AnimationNode::PhaseBefore, AnimationNode::PhaseActive, timing)));
    // Active, and parent After
    EXPECT_TRUE(isNull(calculateActiveTime(20, Timing::FillModeNone, 15, AnimationNode::PhaseAfter, AnimationNode::PhaseActive, timing)));
    EXPECT_TRUE(isNull(calculateActiveTime(20, Timing::FillModeBackwards, 15, AnimationNode::PhaseAfter, AnimationNode::PhaseActive, timing)));
    // Active, and parent Active
    EXPECT_EQ(5, calculateActiveTime(20, Timing::FillModeForwards, 15, AnimationNode::PhaseActive, AnimationNode::PhaseActive, timing));

    // After Phase
    timing.startDelay = 10;
    EXPECT_EQ(21, calculateActiveTime(21, Timing::FillModeForwards, 45, AnimationNode::PhaseActive, AnimationNode::PhaseAfter, timing));
    EXPECT_EQ(21, calculateActiveTime(21, Timing::FillModeBoth, 45, AnimationNode::PhaseActive, AnimationNode::PhaseAfter, timing));
    EXPECT_TRUE(isNull(calculateActiveTime(21, Timing::FillModeBackwards, 45, AnimationNode::PhaseActive, AnimationNode::PhaseAfter, timing)));
    EXPECT_TRUE(isNull(calculateActiveTime(21, Timing::FillModeNone, 45, AnimationNode::PhaseActive, AnimationNode::PhaseAfter, timing)));

    // None
    EXPECT_TRUE(isNull(calculateActiveTime(32, Timing::FillModeNone, nullValue(), AnimationNode::PhaseNone, AnimationNode::PhaseNone, timing)));
}

TEST(AnimationTimingCalculationsTest, ScaledActiveTime)
{
    Timing timing;

    // calculateScaledActiveTime(activeDuration, activeTime, startOffset, timing)

    // if the active time is null
    EXPECT_TRUE(isNull(calculateScaledActiveTime(4, nullValue(), 5, timing)));

    // if the playback rate is negative
    timing.playbackRate = -1;
    EXPECT_EQ(35, calculateScaledActiveTime(40, 10, 5, timing));

    // otherwise
    timing.playbackRate = 0;
    EXPECT_EQ(5, calculateScaledActiveTime(40, 10, 5, timing));
    timing.playbackRate = 1;
    EXPECT_EQ(15, calculateScaledActiveTime(40, 10, 5, timing));

    // infinte activeTime
    timing.playbackRate = 0;
    EXPECT_EQ(0, calculateScaledActiveTime(std::numeric_limits<double>::infinity(), std::numeric_limits<double>::infinity(), 0, timing));
    timing.playbackRate = 1;
    EXPECT_EQ(std::numeric_limits<double>::infinity(), calculateScaledActiveTime(std::numeric_limits<double>::infinity(), std::numeric_limits<double>::infinity(), 0, timing));
}

TEST(AnimationTimingCalculationsTest, IterationTime)
{
    Timing timing;

    // calculateIterationTime(iterationDuration, repeatedDuration, scaledActiveTime, startOffset, timing)

    // if the scaled active time is null
    EXPECT_TRUE(isNull(calculateIterationTime(1, 1, nullValue(), 1, timing)));

    // if (complex-conditions)...
    EXPECT_EQ(12, calculateIterationTime(12, 12, 12, 0, timing));

    // otherwise
    timing.iterationCount = 10;
    EXPECT_EQ(5, calculateIterationTime(10, 100, 25, 4, timing));
    EXPECT_EQ(7, calculateIterationTime(11, 110, 29, 1, timing));
    timing.iterationStart = 1.1;
    EXPECT_EQ(8, calculateIterationTime(12, 120, 20, 7, timing));
}

TEST(AnimationTimingCalculationsTest, CurrentIteration)
{
    Timing timing;

    // calculateCurrentIteration(iterationDuration, iterationTime, scaledActiveTime, timing)

    // if the scaled active time is null
    EXPECT_TRUE(isNull(calculateCurrentIteration(1, 1, nullValue(), timing)));

    // if the scaled active time is zero
    EXPECT_EQ(0, calculateCurrentIteration(1, 1, 0, timing));

    // if the iteration time equals the iteration duration
    timing.iterationStart = 4;
    timing.iterationCount = 7;
    EXPECT_EQ(10, calculateCurrentIteration(5, 5, 9, timing));

    // otherwise
    EXPECT_EQ(3, calculateCurrentIteration(3.2, 3.1, 10, timing));
}

TEST(AnimationTimingCalculationsTest, DirectedTime)
{
    Timing timing;

    // calculateDirectedTime(currentIteration, iterationDuration, iterationTime, timing)

    // if the iteration time is null
    EXPECT_TRUE(isNull(calculateDirectedTime(1, 2, nullValue(), timing)));

    // forwards
    EXPECT_EQ(17, calculateDirectedTime(0, 20, 17, timing));
    EXPECT_EQ(17, calculateDirectedTime(1, 20, 17, timing));
    timing.direction = Timing::PlaybackDirectionAlternate;
    EXPECT_EQ(17, calculateDirectedTime(0, 20, 17, timing));
    EXPECT_EQ(17, calculateDirectedTime(2, 20, 17, timing));
    timing.direction = Timing::PlaybackDirectionAlternateReverse;
    EXPECT_EQ(17, calculateDirectedTime(1, 20, 17, timing));
    EXPECT_EQ(17, calculateDirectedTime(3, 20, 17, timing));

    // reverse
    timing.direction = Timing::PlaybackDirectionReverse;
    EXPECT_EQ(3, calculateDirectedTime(0, 20, 17, timing));
    EXPECT_EQ(3, calculateDirectedTime(1, 20, 17, timing));
    timing.direction = Timing::PlaybackDirectionAlternate;
    EXPECT_EQ(3, calculateDirectedTime(1, 20, 17, timing));
    EXPECT_EQ(3, calculateDirectedTime(3, 20, 17, timing));
    timing.direction = Timing::PlaybackDirectionAlternateReverse;
    EXPECT_EQ(3, calculateDirectedTime(0, 20, 17, timing));
    EXPECT_EQ(3, calculateDirectedTime(2, 20, 17, timing));
}

TEST(AnimationTimingCalculationsTest, TransformedTime)
{
    Timing timing;

    // calculateTransformedTime(currentIteration, iterationDuration, iterationTime, timing)

    // Iteration time is null
    EXPECT_TRUE(isNull(calculateTransformedTime(1, 2, nullValue(), timing)));

    // PlaybackDirectionForwards
    EXPECT_EQ(12, calculateTransformedTime(0, 20, 12, timing));
    EXPECT_EQ(12, calculateTransformedTime(1, 20, 12, timing));

    // PlaybackDirectionForwards with timing function
    timing.timingFunction = StepsTimingFunction::create(4, StepsTimingFunction::StepAtEnd);
    EXPECT_EQ(10, calculateTransformedTime(0, 20, 12, timing));
    EXPECT_EQ(10, calculateTransformedTime(1, 20, 12, timing));

    // PlaybackDirectionReverse
    timing.timingFunction = Timing::defaults().timingFunction;
    timing.direction = Timing::PlaybackDirectionReverse;
    EXPECT_EQ(8, calculateTransformedTime(0, 20, 12, timing));
    EXPECT_EQ(8, calculateTransformedTime(1, 20, 12, timing));

    // PlaybackDirectionReverse with timing function
    timing.timingFunction = StepsTimingFunction::create(4, StepsTimingFunction::StepAtEnd);
    EXPECT_EQ(5, calculateTransformedTime(0, 20, 12, timing));
    EXPECT_EQ(5, calculateTransformedTime(1, 20, 12, timing));

    // Timing function when directed time is null.
    EXPECT_TRUE(isNull(calculateTransformedTime(1, 2, nullValue(), timing)));

    // Timing function when iterationDuration is infinity
    timing.direction = Timing::PlaybackDirectionNormal;
    EXPECT_EQ(0, calculateTransformedTime(0, std::numeric_limits<double>::infinity(), 0, timing));
    EXPECT_EQ(1, calculateTransformedTime(0, std::numeric_limits<double>::infinity(), 1, timing));
    timing.direction = Timing::PlaybackDirectionReverse;
    EXPECT_EQ(std::numeric_limits<double>::infinity(), calculateTransformedTime(0, std::numeric_limits<double>::infinity(), 0, timing));
    EXPECT_EQ(std::numeric_limits<double>::infinity(), calculateTransformedTime(0, std::numeric_limits<double>::infinity(), 1, timing));
}

}