/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated July 28, 2023. Replaces all prior versions.
 *
 * Copyright (c) 2013-2023, 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
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE
 * SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

package spine.animation;

import openfl.Vector;
import spine.Bone;
import spine.Event;
import spine.Skeleton;

class ShearYTimeline extends CurveTimeline1 implements BoneTimeline {
	private var boneIndex:Int = 0;

	public function new(frameCount:Int, bezierCount:Int, boneIndex:Int) {
		super(frameCount, bezierCount, Vector.ofArray([Property.shearY + "|" + boneIndex]));
		this.boneIndex = boneIndex;
	}

	public function getBoneIndex():Int {
		return boneIndex;
	}

	override public function apply(skeleton:Skeleton, lastTime:Float, time:Float, events:Vector<Event>, alpha:Float, blend:MixBlend,
			direction:MixDirection):Void {
		var bone:Bone = skeleton.bones[boneIndex];
		if (!bone.active)
			return;

		if (time < frames[0]) {
			switch (blend) {
				case MixBlend.setup:
					bone.shearY = bone.data.shearY;
				case MixBlend.first:
					bone.shearY += (bone.data.shearY - bone.shearY) * alpha;
			}
			return;
		}

		var y:Float = getCurveValue(time);
		switch (blend) {
			case MixBlend.setup:
				bone.shearY = bone.data.shearY + y * alpha;
			case MixBlend.first, MixBlend.replace:
				bone.shearY += (bone.data.shearY + y - bone.shearY) * alpha;
			case MixBlend.add:
				bone.shearY += y * alpha;
		}
	}
}