/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "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 ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#ifdef SPINE_UE4
#include "SpinePluginPrivatePCH.h"
#endif

#include <spine/PathConstraintMixTimeline.h>

#include <spine/Skeleton.h>
#include <spine/Event.h>

#include <spine/Animation.h>
#include <spine/TimelineType.h>
#include <spine/Slot.h>
#include <spine/SlotData.h>
#include <spine/PathConstraint.h>
#include <spine/PathConstraintData.h>

using namespace spine;

RTTI_IMPL(PathConstraintMixTimeline, CurveTimeline)

const int PathConstraintMixTimeline::ENTRIES = 3;
const int PathConstraintMixTimeline::PREV_TIME = -3;
const int PathConstraintMixTimeline::PREV_ROTATE = -2;
const int PathConstraintMixTimeline::PREV_TRANSLATE = -1;
const int PathConstraintMixTimeline::ROTATE = 1;
const int PathConstraintMixTimeline::TRANSLATE = 2;

PathConstraintMixTimeline::PathConstraintMixTimeline(int frameCount) : CurveTimeline(frameCount),
	_pathConstraintIndex(0)
{
	_frames.setSize(frameCount * ENTRIES, 0);
}

void PathConstraintMixTimeline::apply(Skeleton &skeleton, float lastTime, float time, Vector<Event *> *pEvents, float alpha,
	MixBlend blend, MixDirection direction
) {
	SP_UNUSED(lastTime);
	SP_UNUSED(pEvents);
	SP_UNUSED(direction);

	PathConstraint *constraintP = skeleton._pathConstraints[_pathConstraintIndex];
	PathConstraint &constraint = *constraintP;
	if (!constraint.isActive()) return;

	if (time < _frames[0]) {
		switch (blend) {
		case MixBlend_Setup:
			constraint._rotateMix = constraint._data._rotateMix;
			constraint._translateMix = constraint._data._translateMix;
			return;
		case MixBlend_First:
			constraint._rotateMix += (constraint._data._rotateMix - constraint._rotateMix) * alpha;
			constraint._translateMix += (constraint._data._translateMix - constraint._translateMix) * alpha;
			return;
		default:
			return;
		}
	}

	float rotate, translate;
	if (time >= _frames[_frames.size() - ENTRIES]) {
		// Time is after last frame.
		rotate = _frames[_frames.size() + PREV_ROTATE];
		translate = _frames[_frames.size() + PREV_TRANSLATE];
	} else {
		// Interpolate between the previous frame and the current frame.
		int frame = Animation::binarySearch(_frames, time, ENTRIES);
		rotate = _frames[frame + PREV_ROTATE];
		translate = _frames[frame + PREV_TRANSLATE];
		float frameTime = _frames[frame];
		float percent = getCurvePercent(frame / ENTRIES - 1,
			1 - (time - frameTime) / (_frames[frame + PREV_TIME] - frameTime));

		rotate += (_frames[frame + ROTATE] - rotate) * percent;
		translate += (_frames[frame + TRANSLATE] - translate) * percent;
	}

	if (blend == MixBlend_Setup) {
		constraint._rotateMix = constraint._data._rotateMix + (rotate - constraint._data._rotateMix) * alpha;
		constraint._translateMix =
			constraint._data._translateMix + (translate - constraint._data._translateMix) * alpha;
	} else {
		constraint._rotateMix += (rotate - constraint._rotateMix) * alpha;
		constraint._translateMix += (translate - constraint._translateMix) * alpha;
	}
}

int PathConstraintMixTimeline::getPropertyId() {
	return ((int) TimelineType_PathConstraintMix << 24) + _pathConstraintIndex;
}

void PathConstraintMixTimeline::setFrame(int frameIndex, float time, float rotateMix, float translateMix) {
	frameIndex *= ENTRIES;
	_frames[frameIndex] = time;
	_frames[frameIndex + ROTATE] = rotateMix;
	_frames[frameIndex + TRANSLATE] = translateMix;
}