#ifndef _SKELETON_HPP_
#define _SKELETON_HPP_

#include <glm/glm.hpp>
#include <glm/gtx/quaternion.hpp>
#include <map>
#include <vector>

class ModelFrame;
/**
 * Data class for additional frame transformation and meta data.
 * 
 * Provides interfaces to modify and query the visibility of model frames,
 * as well as their transformation. Modified by Animator to animate models.
 */
class Skeleton
{
public:
	struct FrameTransform
	{
		glm::vec3 translation;
		glm::quat rotation;
	};
	
	static FrameTransform IdentityTransform;
	
	struct FrameData
	{
		FrameTransform a;
		FrameTransform b;
		bool enabled;
	};
	
	static FrameData IdentityData;
	
	typedef std::map<unsigned int, FrameData> FramesData;
	typedef std::map<unsigned int, FrameTransform> TransformData;
	
	Skeleton();
	
	void setAllData(const FramesData& data);
	
	const FrameData& getData(unsigned int frameIdx) const;
	
	void setData(unsigned int frameIdx, const FrameData& data);
	void setEnabled(ModelFrame* frame, bool enabled);
	
	void setEnabled(unsigned int frameIdx, bool enabled);
	
	const FrameTransform& getInterpolated(unsigned int frameIdx) const;
	
	glm::mat4 getMatrix(unsigned int frameIdx) const;
	glm::mat4 getMatrix(ModelFrame* frame) const;
	
	void interpolate(float alpha);
	
private:
	
	FramesData framedata;
	TransformData interpolateddata;
	
};

#endif