/******************************************************************************
 * 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.
 *****************************************************************************/

#ifndef Spine_Skeleton_h
#define Spine_Skeleton_h

#include <spine/Vector.h>
#include <spine/MathUtil.h>
#include <spine/SpineObject.h>
#include <spine/SpineString.h>
#include <spine/Color.h>

namespace spine {
class SkeletonData;

class Bone;

class Updatable;

class Slot;

class IkConstraint;

class PathConstraint;

class TransformConstraint;

class Skin;

class Attachment;

class SP_API Skeleton : public SpineObject {
	friend class AnimationState;

	friend class SkeletonBounds;

	friend class SkeletonClipping;

	friend class AttachmentTimeline;

	friend class ColorTimeline;

	friend class DeformTimeline;

	friend class DrawOrderTimeline;

	friend class EventTimeline;

	friend class IkConstraintTimeline;

	friend class PathConstraintMixTimeline;

	friend class PathConstraintPositionTimeline;

	friend class PathConstraintSpacingTimeline;

	friend class ScaleTimeline;

	friend class ShearTimeline;

	friend class TransformConstraintTimeline;

	friend class TranslateTimeline;

	friend class TwoColorTimeline;

public:
	explicit Skeleton(SkeletonData *skeletonData);

	~Skeleton();

	/// Caches information about bones and constraints. Must be called if bones, constraints or weighted path attachments are added
	/// or removed.
	void updateCache();

	void printUpdateCache();

	/// Updates the world transform for each bone and applies constraints.
	void updateWorldTransform();

	/// Sets the bones, constraints, and slots to their setup pose values.
	void setToSetupPose();

	/// Sets the bones and constraints to their setup pose values.
	void setBonesToSetupPose();

	void setSlotsToSetupPose();

	/// @return May be NULL.
	Bone *findBone(const String &boneName);

	/// @return -1 if the bone was not found.
	int findBoneIndex(const String &boneName);

	/// @return May be NULL.
	Slot *findSlot(const String &slotName);

	/// @return -1 if the bone was not found.
	int findSlotIndex(const String &slotName);

	/// Sets a skin by name (see setSkin).
	void setSkin(const String &skinName);

	/// Attachments from the new skin are attached if the corresponding attachment from the old skin was attached.
	/// If there was no old skin, each slot's setup mode attachment is attached from the new skin.
	/// After changing the skin, the visible attachments can be reset to those attached in the setup pose by calling
	/// See Skeleton::setSlotsToSetupPose()
	/// Also, often AnimationState::apply(Skeleton&) is called before the next time the
	/// skeleton is rendered to allow any attachment keys in the current animation(s) to hide or show attachments from the new skin.
	/// @param newSkin May be NULL.
	void setSkin(Skin *newSkin);

	/// @return May be NULL.
	Attachment *getAttachment(const String &slotName, const String &attachmentName);

	/// @return May be NULL.
	Attachment *getAttachment(int slotIndex, const String &attachmentName);

	/// @param attachmentName May be empty.
	void setAttachment(const String &slotName, const String &attachmentName);

	/// @return May be NULL.
	IkConstraint *findIkConstraint(const String &constraintName);

	/// @return May be NULL.
	TransformConstraint *findTransformConstraint(const String &constraintName);

	/// @return May be NULL.
	PathConstraint *findPathConstraint(const String &constraintName);

	void update(float delta);

	/// Returns the axis aligned bounding box (AABB) of the region and mesh attachments for the current pose.
	/// @param outX The horizontal distance between the skeleton origin and the left side of the AABB.
	/// @param outY The vertical distance between the skeleton origin and the bottom side of the AABB.
	/// @param outWidth The width of the AABB
	/// @param outHeight The height of the AABB.
	/// @param outVertexBuffer Reference to hold a Vector of floats. This method will assign it with new floats as needed.
	void getBounds(float &outX, float &outY, float &outWidth, float &outHeight, Vector<float> &outVertexBuffer);

	Bone *getRootBone();

	SkeletonData *getData();

	Vector<Bone *> &getBones();

	Vector<Updatable *> &getUpdateCacheList();

	Vector<Slot *> &getSlots();

	Vector<Slot *> &getDrawOrder();

	Vector<IkConstraint *> &getIkConstraints();

	Vector<PathConstraint *> &getPathConstraints();

	Vector<TransformConstraint *> &getTransformConstraints();

	Skin *getSkin();

	Color &getColor();

	float getTime();

	void setTime(float inValue);

	void setPosition(float x, float y);

	float getX();

	void setX(float inValue);

	float getY();

	void setY(float inValue);

	float getScaleX();

	void setScaleX(float inValue);

	float getScaleY();

	void setScaleY(float inValue);

private:
	SkeletonData *_data;
	Vector<Bone *> _bones;
	Vector<Slot *> _slots;
	Vector<Slot *> _drawOrder;
	Vector<IkConstraint *> _ikConstraints;
	Vector<TransformConstraint *> _transformConstraints;
	Vector<PathConstraint *> _pathConstraints;
	Vector<Updatable *> _updateCache;
	Vector<Bone *> _updateCacheReset;
	Skin *_skin;
	Color _color;
	float _time;
	float _scaleX, _scaleY;
	float _x, _y;

	void sortIkConstraint(IkConstraint *constraint);

	void sortPathConstraint(PathConstraint *constraint);

	void sortTransformConstraint(TransformConstraint *constraint);

	void sortPathConstraintAttachment(Skin *skin, size_t slotIndex, Bone &slotBone);

	void sortPathConstraintAttachment(Attachment *attachment, Bone &slotBone);

	void sortBone(Bone *bone);

	static void sortReset(Vector<Bone *> &bones);
};
}

#endif /* Spine_Skeleton_h */