//
//  Skeleton.h
//  interface
//
//  Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
//

#ifndef hifi_Skeleton_h
#define hifi_Skeleton_h

#include <glm/glm.hpp>
#include <glm/gtc/quaternion.hpp>

enum AvatarJointID
{
	AVATAR_JOINT_NULL = -1,
	AVATAR_JOINT_PELVIS,	
	AVATAR_JOINT_TORSO,	
	AVATAR_JOINT_CHEST,	
	AVATAR_JOINT_NECK_BASE,	
	AVATAR_JOINT_HEAD_BASE,	
	AVATAR_JOINT_HEAD_TOP,	
	AVATAR_JOINT_LEFT_COLLAR,
	AVATAR_JOINT_LEFT_SHOULDER,
	AVATAR_JOINT_LEFT_ELBOW,
	AVATAR_JOINT_LEFT_WRIST,
	AVATAR_JOINT_LEFT_FINGERTIPS,
	AVATAR_JOINT_RIGHT_COLLAR,
	AVATAR_JOINT_RIGHT_SHOULDER,
	AVATAR_JOINT_RIGHT_ELBOW,
	AVATAR_JOINT_RIGHT_WRIST,
	AVATAR_JOINT_RIGHT_FINGERTIPS,
	AVATAR_JOINT_LEFT_HIP,
	AVATAR_JOINT_LEFT_KNEE,
	AVATAR_JOINT_LEFT_HEEL,		
	AVATAR_JOINT_LEFT_TOES,		
	AVATAR_JOINT_RIGHT_HIP,	
	AVATAR_JOINT_RIGHT_KNEE,	
	AVATAR_JOINT_RIGHT_HEEL,	
	AVATAR_JOINT_RIGHT_TOES,	
    
	NUM_AVATAR_JOINTS
};


class Skeleton {
public:
    Skeleton();

    void initialize();
    void update(float deltaTime, const glm::quat&, glm::vec3 position);
    void render();
    
    float getArmLength();
    float getHeight();
    float getPelvisStandingHeight();
    float getPelvisFloatingHeight();
    //glm::vec3 getJointVectorFromParent(AvatarJointID jointID) {return joint[jointID].position - joint[joint[jointID].parent].position; }
    
    struct AvatarJoint
    {
        AvatarJointID parent;               // which joint is this joint connected to?
        glm::vec3	  position;				// the position at the "end" of the joint - in global space
        glm::vec3	  defaultPosePosition;	// the parent relative position when the avatar is in the default pose
        glm::quat     rotation;             // the parent-relative rotation (orientation) of the joint as a quaternion
        float		  length;				// the length of vector between the joint and its parent
    };

    AvatarJoint	joint[ NUM_AVATAR_JOINTS ];        
 };

#endif