/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/

#ifndef __KeyFrame_H__
#define __KeyFrame_H__

#include "OgrePrerequisites.h"
#include "OgreVector3.h"
#include "OgreQuaternion.h"
#include "OgreAny.h"
#include "OgreHardwareVertexBuffer.h"
#include "OgreIteratorWrappers.h"

namespace Ogre 
{

    /** A key frame in an animation sequence defined by an AnimationTrack.
    @remarks
        This class can be used as a basis for all kinds of key frames. 
        The unifying principle is that multiple KeyFrames define an 
        animation sequence, with the exact state of the animation being an 
        interpolation between these key frames. 
    */
    class _OgreExport KeyFrame
    {
    public:

        /** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */
        KeyFrame(const AnimationTrack* parent, Real time);

		virtual ~KeyFrame() {}

        /** Gets the time of this keyframe in the animation sequence. */
        Real getTime(void) const { return mTime; }

		/** Clone a keyframe (internal use only) */
		virtual KeyFrame* _clone(AnimationTrack* newParent) const;


    protected:
        Real mTime;
        const AnimationTrack* mParentTrack;
    };


	/** Specialised KeyFrame which stores any numeric value.
	*/
	class _OgreExport NumericKeyFrame : public KeyFrame
	{
	public:
		/** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */
		NumericKeyFrame(const AnimationTrack* parent, Real time);
		~NumericKeyFrame() {}

		/** Get the value at this keyframe. */
		virtual const AnyNumeric& getValue(void) const;
		/** Set the value at this keyframe.
		@remarks
			All keyframe values must have a consistent type. 
		*/
		virtual void setValue(const AnyNumeric& val);

		/** Clone a keyframe (internal use only) */
		KeyFrame* _clone(AnimationTrack* newParent) const;
	protected:
		AnyNumeric mValue;
	};


	/** Specialised KeyFrame which stores a full transform. */
	class _OgreExport TransformKeyFrame : public KeyFrame
	{
	public:
		/** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */
		TransformKeyFrame(const AnimationTrack* parent, Real time);
		~TransformKeyFrame() {}
		/** Sets the translation associated with this keyframe. 
		@remarks    
		The translation factor affects how much the keyframe translates (moves) it's animable
		object at it's time index.
		@param trans The vector to translate by
		*/
		virtual void setTranslate(const Vector3& trans);

		/** Gets the translation applied by this keyframe. */
		const Vector3& getTranslate(void) const;

		/** Sets the scaling factor applied by this keyframe to the animable
		object at it's time index.
		@param scale The vector to scale by (beware of supplying zero values for any component of this
		vector, it will scale the object to zero dimensions)
		*/
		virtual void setScale(const Vector3& scale);

		/** Gets the scaling factor applied by this keyframe. */
		virtual const Vector3& getScale(void) const;

		/** Sets the rotation applied by this keyframe.
		@param rot The rotation applied; use Quaternion methods to convert from angle/axis or Matrix3 if
		you don't like using Quaternions directly.
		*/
		virtual void setRotation(const Quaternion& rot);

		/** Gets the rotation applied by this keyframe. */
		virtual const Quaternion& getRotation(void) const;

		/** Clone a keyframe (internal use only) */
		KeyFrame* _clone(AnimationTrack* newParent) const;
	protected:
		Vector3 mTranslate;
		Vector3 mScale;
		Quaternion mRotate;


	};



	/** Specialised KeyFrame which stores absolute vertex positions for a complete
		buffer, designed to be interpolated with other keys in the same track. 
	*/
	class _OgreExport VertexMorphKeyFrame : public KeyFrame
	{
	public:
		/** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */
		VertexMorphKeyFrame(const AnimationTrack* parent, Real time);
		~VertexMorphKeyFrame() {}
		/** Sets the vertex buffer containing the source positions for this keyframe. 
		@remarks    
			We assume that positions are the first 3 float elements in this buffer,
			although we don't necessarily assume they're the only ones in there.
		@param buf Vertex buffer link; will not be modified so can be shared
			read-only data
		*/
		void setVertexBuffer(const HardwareVertexBufferSharedPtr& buf);

		/** Gets the vertex buffer containing positions for this keyframe. */
		const HardwareVertexBufferSharedPtr& getVertexBuffer(void) const;

		/** Clone a keyframe (internal use only) */
		KeyFrame* _clone(AnimationTrack* newParent) const;		

	protected:
		HardwareVertexBufferSharedPtr mBuffer;

	};

	/** Specialised KeyFrame which references a Mesh::Pose at a certain influence
		level, which stores offsets for a subset of the vertices 
		in a buffer to provide a blendable pose.
	*/
	class _OgreExport VertexPoseKeyFrame : public KeyFrame
	{
	public:
		/** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */
		VertexPoseKeyFrame(const AnimationTrack* parent, Real time);
		~VertexPoseKeyFrame() {}

		/** Reference to a pose at a given influence level 
		@remarks
			Each keyframe can refer to many poses each at a given influence level.
		**/
		struct PoseRef
		{
			/** The linked pose index.
			@remarks
				The Mesh contains all poses for all vertex data in one list, both 
				for the shared vertex data and the dedicated vertex data on submeshes.
				The 'target' on the parent track must match the 'target' on the 
				linked pose.
			*/
			ushort poseIndex;
			/** Influence level of the linked pose. 
				1.0 for full influence (full offset), 0.0 for no influence.
			*/
			Real influence;

			PoseRef(ushort p, Real i) : poseIndex(p), influence(i) {}
		};
		typedef std::vector<PoseRef> PoseRefList;

		/** Add a new pose reference. 
		@see PoseRef
		*/
		void addPoseReference(ushort poseIndex, Real influence);
		/** Update the influence of a pose reference. 
		@see PoseRef
		*/
		void updatePoseReference(ushort poseIndex, Real influence);
		/** Remove reference to a given pose. 
		@param poseIndex The pose index (not the index of the reference)
		*/
		void removePoseReference(ushort poseIndex);
		/** Remove all pose references. */
		void removeAllPoseReferences(void);


		/** Get a const reference to the list of pose references. */
		const PoseRefList& getPoseReferences(void) const;

		typedef VectorIterator<PoseRefList> PoseRefIterator;
		typedef ConstVectorIterator<PoseRefList> ConstPoseRefIterator;

		/** Get an iterator over the pose references. */
		PoseRefIterator getPoseReferenceIterator(void);

		/** Get a const iterator over the pose references. */
		ConstPoseRefIterator getPoseReferenceIterator(void) const;

		/** Clone a keyframe (internal use only) */
		KeyFrame* _clone(AnimationTrack* newParent) const;
		
	protected:
		PoseRefList mPoseRefs;

	};

}


#endif