/** 
 * @file llcharacter.h
 * @brief Implementation of LLCharacter class.
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library 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;
 * version 2.1 of the License only.
 * 
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLCHARACTER_H
#define LL_LLCHARACTER_H

//-----------------------------------------------------------------------------
// Header Files
//-----------------------------------------------------------------------------
#include <string>

#include "lljoint.h"
#include "llmotioncontroller.h"
#include "llvisualparam.h"
#include "llstringtable.h"
#include "llpointer.h"
#include "llrefcount.h"
#include "llsortedvector.h"

#include "boost/unordered/unordered_flat_map.hpp"

class LLPolyMesh;

class LLPauseRequestHandle : public LLThreadSafeRefCount
{
public:
	LLPauseRequestHandle() = default;
};

typedef LLPointer<LLPauseRequestHandle> LLAnimPauseRequest;

//-----------------------------------------------------------------------------
// class LLCharacter
//-----------------------------------------------------------------------------
class LLCharacter
{
public:
	// Constructor
	LLCharacter();

	// Destructor
	virtual ~LLCharacter();

	//-------------------------------------------------------------------------
	// LLCharacter Interface
	// These functions must be implemented by subclasses.
	//-------------------------------------------------------------------------

	// get the prefix to be used to lookup motion data files
	// from the viewer data directory
	virtual const char *getAnimationPrefix() = 0;

	// get the root joint of the character
	virtual LLJoint *getRootJoint() = 0;

	// get the specified joint
	// default implementation does recursive search,
	// subclasses may optimize/cache results.
	virtual LLJoint *getJoint( const std::string &name );

	// get the position of the character
	virtual LLVector3 getCharacterPosition() = 0;

	// get the rotation of the character
	virtual LLQuaternion getCharacterRotation() = 0;

	// get the velocity of the character
	virtual LLVector3 getCharacterVelocity() = 0;

	// get the angular velocity of the character
	virtual LLVector3 getCharacterAngularVelocity() = 0;

	// get the height & normal of the ground under a point
	virtual void getGround(const LLVector3 &inPos, LLVector3 &outPos, LLVector3 &outNorm) = 0;

	// skeleton joint accessor to support joint subclasses
	virtual LLJoint *getCharacterJoint( U32 i ) = 0;

	// get the physics time dilation for the simulator
	virtual F32 getTimeDilation() = 0;

	// gets current pixel area of this character
	virtual F32 getPixelArea() const = 0;

	// gets the head mesh of the character
	virtual LLPolyMesh*	getHeadMesh() = 0;

	// gets the upper body mesh of the character
	virtual LLPolyMesh*	getUpperBodyMesh() = 0;

	// gets global coordinates from agent local coordinates
	virtual LLVector3d	getPosGlobalFromAgent(const LLVector3 &position) = 0;

	// gets agent local coordinates from global coordinates
	virtual LLVector3	getPosAgentFromGlobal(const LLVector3d &position) = 0;

	// updates all visual parameters for this character
	virtual void updateVisualParams();

	virtual void addDebugText( const std::string& text ) = 0;

	virtual const LLUUID&	getID() const = 0;
	//-------------------------------------------------------------------------
	// End Interface
	//-------------------------------------------------------------------------
	// registers a motion with the character
	// returns true if successful
	BOOL registerMotion( const LLUUID& id, LLMotionConstructor create );

	void removeMotion( const LLUUID& id );

	// returns an instance of a registered motion, creating one if necessary
	LLMotion::ptr_t createMotion( const LLUUID &id );

	// returns an existing instance of a registered motion
	LLMotion::ptr_t findMotion( const LLUUID &id );
	
	// start a motion
	// returns true if successful, false if an error occurred
	virtual BOOL startMotion( const LLUUID& id, F32 start_offset = 0.f);

	// stop a motion
	virtual BOOL stopMotion( const LLUUID& id, BOOL stop_immediate = FALSE );

	// is this motion active?
	BOOL isMotionActive( const LLUUID& id );

	// Event handler for motion deactivation.
	// Called when a motion has completely stopped and has been deactivated.
	// Subclasses may optionally override this.
	// The default implementation does nothing.
	virtual void requestStopMotion( const LLMotion::ptr_t &motion );
	
	// periodic update function, steps the motion controller
	enum e_update_t { NORMAL_UPDATE, HIDDEN_UPDATE, FORCE_UPDATE };
	virtual void updateMotions(e_update_t update_type);

	LLAnimPauseRequest requestPause();
	BOOL areAnimationsPaused() const { return mMotionController.isPaused(); }
	void setAnimTimeFactor(F32 factor) { mMotionController.setTimeFactor(factor); }
	void setTimeStep(F32 time_step) { mMotionController.setTimeStep(time_step); }

	LLMotionController& getMotionController() { return mMotionController; }
	
	// Releases all motion instances which should result in
	// no cached references to character joint data.  This is 
	// useful if a character wants to rebuild it's skeleton.
	virtual void flushAllMotions();
	
	// Flush only wipes active animations. 
	virtual void deactivateAllMotions();

	// dumps information for debugging
	virtual void dumpCharacter( LLJoint *joint = NULL );

	virtual F32 getPreferredPelvisHeight() { return mPreferredPelvisHeight; }

	virtual LLVector3 getVolumePos(S32 joint_index, LLVector3& volume_offset) { return LLVector3::zero; }
	
	virtual LLJoint* findCollisionVolume(S32 volume_id) { return NULL; }

	virtual S32 getCollisionVolumeID(std::string_view name) { return -1; }

	void setAnimationData(std::string name, void *data);
	
	void *getAnimationData(std::string_view name);

	void removeAnimationData(std::string_view name);
	
	void addVisualParam(LLVisualParam *param);
	void addSharedVisualParam(LLVisualParam *param);

	virtual BOOL setVisualParamWeight(const LLVisualParam *which_param, F32 weight, bool upload_bake = false );
	virtual BOOL setVisualParamWeight(const char* param_name, F32 weight, bool upload_bake = false);
	virtual BOOL setVisualParamWeight(S32 index, F32 weight, bool upload_bake = false);


	// get visual param weight by param or name
	F32 getVisualParamWeight(LLVisualParam *distortion);
	F32 getVisualParamWeight(const char* param_name);
	F32 getVisualParamWeight(S32 index);

	// set all morph weights to defaults
	void clearVisualParamWeights();

	// visual parameter accessors
	LLVisualParam*	getFirstVisualParam()
	{
		mCurIterator = mVisualParamSortedVector.begin();
		return getNextVisualParam();
	}
	LLVisualParam*	getNextVisualParam()
	{
		if (mCurIterator == mVisualParamSortedVector.end())
			return nullptr;
		return (mCurIterator++)->second;
	}

	S32 getVisualParamCountInGroup(const EVisualParamGroup group) const
	{
		S32 rtn = 0;
		for (const auto& pair : mVisualParamSortedVector)
		{
			if (pair.second->getGroup() == group)
			{
				++rtn;
			}
		}
		return rtn;
	}

	LLVisualParam*	getVisualParam(S32 id) const
	{
		visual_param_index_map_t::const_iterator iter = mVisualParamIndexMap.find(id);
		return (iter == mVisualParamIndexMap.end()) ? 0 : iter->second;
	}

	S32				getVisualParamCount() const { return (S32)mVisualParamIndexMap.size(); }
	LLVisualParam*	getVisualParam(const char *name);


	ESex getSex() const			{ return mSex; }
	void setSex( ESex sex )		{ mSex = sex; }

	U32				getAppearanceSerialNum() const		{ return mAppearanceSerialNum; }
	void			setAppearanceSerialNum( U32 num )	{ mAppearanceSerialNum = num; }

	U32				getSkeletonSerialNum() const		{ return mSkeletonSerialNum; }
	void			bumpSkeletonSerialNum()	{ ++mSkeletonSerialNum; }

	static std::vector< LLCharacter* > sInstances;
	static BOOL sAllowInstancesChange ; //debug use

	virtual void	setHoverOffset(const LLVector3& hover_offset, bool send_update=true) { mHoverOffset = hover_offset; }
	const LLVector3& getHoverOffset() const { return mHoverOffset; }

protected:
	LLMotionController	mMotionController;

	typedef boost::unordered_flat_map<std::string, void *, al::string_hash, std::equal_to<>> animation_data_map_t;
	animation_data_map_t mAnimationData;

	F32					mPreferredPelvisHeight;
	ESex				mSex;
	U32					mAppearanceSerialNum;
	U32					mSkeletonSerialNum;
	LLAnimPauseRequest	mPauseRequest;

private:
	// visual parameter stuff
	typedef boost::unordered_flat_map<S32, LLVisualParam *> 		visual_param_index_map_t;	//Hash map for fast lookup.
	typedef LLSortedVector<S32,LLVisualParam *>				visual_param_sorted_vec_t;	//Contiguous sorted array.
	typedef boost::unordered_flat_map<char *, LLVisualParam *> 	visual_param_name_map_t;

	visual_param_sorted_vec_t::iterator 			mCurIterator;
	visual_param_sorted_vec_t						mVisualParamSortedVector;
	visual_param_index_map_t 						mVisualParamIndexMap;
	visual_param_name_map_t  						mVisualParamNameMap;
	static LLStringTable sVisualParamNames;	

	LLVector3 mHoverOffset;
};

#endif // LL_LLCHARACTER_H

