/**
 * @file llmodelloader.cpp
 * @brief LLModelLoader class implementation
 *
 * $LicenseInfo:firstyear=2004&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

#include "llmodelloader.h"
#include "llsdserialize.h"
#include "lljoint.h"
#include "llcallbacklist.h"

#include "glh/glh_linear.h"
#include "llmatrix4a.h"
#include <boost/bind.hpp>

std::list<LLModelLoader*> LLModelLoader::sActiveLoaderList;

void stretch_extents(LLModel* model, LLMatrix4a& mat, LLVector4a& min, LLVector4a& max, BOOL& first_transform)
{
	LLVector4a box[] =
	{
		LLVector4a(-1, 1,-1),
		LLVector4a(-1, 1, 1),
		LLVector4a(-1,-1,-1),
		LLVector4a(-1,-1, 1),
		LLVector4a( 1, 1,-1),
		LLVector4a( 1, 1, 1),
		LLVector4a( 1,-1,-1),
		LLVector4a( 1,-1, 1),
	};

	for (S32 j = 0; j < model->getNumVolumeFaces(); ++j)
	{
		const LLVolumeFace& face = model->getVolumeFace(j);

		LLVector4a center;
		center.setAdd(face.mExtents[0], face.mExtents[1]);
		center.mul(0.5f);
		LLVector4a size;
		size.setSub(face.mExtents[1],face.mExtents[0]);
		size.mul(0.5f);

		for (U32 i = 0; i < 8; i++)
		{
			LLVector4a t;
			t.setMul(size, box[i]);
			t.add(center);

			LLVector4a v;

			mat.affineTransform(t, v);

			if (first_transform)
			{
				first_transform = FALSE;
				min = max = v;
			}
			else
			{
				update_min_max(min, max, v);
			}
		}
	}
}

void stretch_extents(LLModel* model, LLMatrix4& mat, LLVector3& min, LLVector3& max, BOOL& first_transform)
{
	LLVector4a mina, maxa;
	LLMatrix4a mata;

	mata.loadu(mat);
	mina.load3(min.mV);
	maxa.load3(max.mV);

	stretch_extents(model, mata, mina, maxa, first_transform);

	min.set(mina.getF32ptr());
	max.set(maxa.getF32ptr());
}

//-----------------------------------------------------------------------------
// LLModelLoader
//-----------------------------------------------------------------------------
LLModelLoader::LLModelLoader(
	std::string				filename,
	S32						lod,
	load_callback_t		load_cb,
	joint_lookup_func_t	joint_lookup_func,
	texture_load_func_t	texture_load_func,
	state_callback_t		state_cb,
	void*						opaque_userdata,
	JointTransformMap&	jointMap,
	JointSet&				jointsFromNodes )
: mJointList( jointMap )
, mJointsFromNode( jointsFromNodes )
, LLThread("Model Loader")
, mFilename(filename)
, mLod(lod)
, mFirstTransform(TRUE)
, mNumOfFetchingTextures(0)
, mLoadCallback(load_cb)
, mJointLookupFunc(joint_lookup_func)
, mTextureLoadFunc(texture_load_func)
, mStateCallback(state_cb)
, mOpaqueData(opaque_userdata)
, mNoNormalize(false)
, mNoOptimize(false)
{
	mJointMap["mPelvis"] = "mPelvis";
	mJointMap["mTorso"] = "mTorso";
	mJointMap["mChest"] = "mChest";
	mJointMap["mNeck"] = "mNeck";
	mJointMap["mHead"] = "mHead";
	mJointMap["mSkull"] = "mSkull";
	mJointMap["mEyeRight"] = "mEyeRight";
	mJointMap["mEyeLeft"] = "mEyeLeft";
	mJointMap["mCollarLeft"] = "mCollarLeft";
	mJointMap["mShoulderLeft"] = "mShoulderLeft";
	mJointMap["mElbowLeft"] = "mElbowLeft";
	mJointMap["mWristLeft"] = "mWristLeft";
	mJointMap["mCollarRight"] = "mCollarRight";
	mJointMap["mShoulderRight"] = "mShoulderRight";
	mJointMap["mElbowRight"] = "mElbowRight";
	mJointMap["mWristRight"] = "mWristRight";
	mJointMap["mHipRight"] = "mHipRight";
	mJointMap["mKneeRight"] = "mKneeRight";
	mJointMap["mAnkleRight"] = "mAnkleRight";
	mJointMap["mFootRight"] = "mFootRight";
	mJointMap["mToeRight"] = "mToeRight";
	mJointMap["mHipLeft"] = "mHipLeft";
	mJointMap["mKneeLeft"] = "mKneeLeft";
	mJointMap["mAnkleLeft"] = "mAnkleLeft";
	mJointMap["mFootLeft"] = "mFootLeft";
	mJointMap["mToeLeft"] = "mToeLeft";

	mJointMap["avatar_mPelvis"] = "mPelvis";
	mJointMap["avatar_mTorso"] = "mTorso";
	mJointMap["avatar_mChest"] = "mChest";
	mJointMap["avatar_mNeck"] = "mNeck";
	mJointMap["avatar_mHead"] = "mHead";
	mJointMap["avatar_mSkull"] = "mSkull";
	mJointMap["avatar_mEyeRight"] = "mEyeRight";
	mJointMap["avatar_mEyeLeft"] = "mEyeLeft";
	mJointMap["avatar_mCollarLeft"] = "mCollarLeft";
	mJointMap["avatar_mShoulderLeft"] = "mShoulderLeft";
	mJointMap["avatar_mElbowLeft"] = "mElbowLeft";
	mJointMap["avatar_mWristLeft"] = "mWristLeft";
	mJointMap["avatar_mCollarRight"] = "mCollarRight";
	mJointMap["avatar_mShoulderRight"] = "mShoulderRight";
	mJointMap["avatar_mElbowRight"] = "mElbowRight";
	mJointMap["avatar_mWristRight"] = "mWristRight";
	mJointMap["avatar_mHipRight"] = "mHipRight";
	mJointMap["avatar_mKneeRight"] = "mKneeRight";
	mJointMap["avatar_mAnkleRight"] = "mAnkleRight";
	mJointMap["avatar_mFootRight"] = "mFootRight";
	mJointMap["avatar_mToeRight"] = "mToeRight";
	mJointMap["avatar_mHipLeft"] = "mHipLeft";
	mJointMap["avatar_mKneeLeft"] = "mKneeLeft";
	mJointMap["avatar_mAnkleLeft"] = "mAnkleLeft";
	mJointMap["avatar_mFootLeft"] = "mFootLeft";
	mJointMap["avatar_mToeLeft"] = "mToeLeft";


	mJointMap["hip"] = "mPelvis";
	mJointMap["abdomen"] = "mTorso";
	mJointMap["chest"] = "mChest";
	mJointMap["neck"] = "mNeck";
	mJointMap["head"] = "mHead";
	mJointMap["figureHair"] = "mSkull";
	mJointMap["lCollar"] = "mCollarLeft";
	mJointMap["lShldr"] = "mShoulderLeft";
	mJointMap["lForeArm"] = "mElbowLeft";
	mJointMap["lHand"] = "mWristLeft";
	mJointMap["rCollar"] = "mCollarRight";
	mJointMap["rShldr"] = "mShoulderRight";
	mJointMap["rForeArm"] = "mElbowRight";
	mJointMap["rHand"] = "mWristRight";
	mJointMap["rThigh"] = "mHipRight";
	mJointMap["rShin"] = "mKneeRight";
	mJointMap["rFoot"] = "mFootRight";
	mJointMap["lThigh"] = "mHipLeft";
	mJointMap["lShin"] = "mKneeLeft";
	mJointMap["lFoot"] = "mFootLeft";

	//move into joint mapper class
	//1. joints for joint offset verification
	mMasterJointList.push_front("mPelvis");
	mMasterJointList.push_front("mTorso");
	mMasterJointList.push_front("mChest");
	mMasterJointList.push_front("mNeck");
	mMasterJointList.push_front("mHead");
	mMasterJointList.push_front("mCollarLeft");
	mMasterJointList.push_front("mShoulderLeft");
	mMasterJointList.push_front("mElbowLeft");
	mMasterJointList.push_front("mWristLeft");
	mMasterJointList.push_front("mCollarRight");
	mMasterJointList.push_front("mShoulderRight");
	mMasterJointList.push_front("mElbowRight");
	mMasterJointList.push_front("mWristRight");
	mMasterJointList.push_front("mHipRight");
	mMasterJointList.push_front("mKneeRight");
	mMasterJointList.push_front("mFootRight");
	mMasterJointList.push_front("mHipLeft");
	mMasterJointList.push_front("mKneeLeft");
	mMasterJointList.push_front("mFootLeft");
	
	//2. legacy joint list - used to verify rigs that will not be using joint offsets
	mMasterLegacyJointList.push_front("mPelvis");
	mMasterLegacyJointList.push_front("mTorso");
	mMasterLegacyJointList.push_front("mChest");
	mMasterLegacyJointList.push_front("mNeck");
	mMasterLegacyJointList.push_front("mHead");
	mMasterLegacyJointList.push_front("mHipRight");
	mMasterLegacyJointList.push_front("mKneeRight");
	mMasterLegacyJointList.push_front("mFootRight");
	mMasterLegacyJointList.push_front("mHipLeft");
	mMasterLegacyJointList.push_front("mKneeLeft");
	mMasterLegacyJointList.push_front("mFootLeft");

	assert_main_thread();
	sActiveLoaderList.push_back(this) ;
}

LLModelLoader::~LLModelLoader()
{
	assert_main_thread();
	sActiveLoaderList.remove(this);
}

void LLModelLoader::run()
{
	doLoadModel();
	doOnIdleOneTime(boost::bind(&LLModelLoader::loadModelCallback,this));
}

bool LLModelLoader::doLoadModel()
{
	//first, look for a .slm file of the same name that was modified later
	//than the .dae

	if (mTrySLM)
	{
		std::string filename = mFilename;
			
		std::string::size_type i = filename.rfind(".");
		if (i != std::string::npos)
		{
			filename.replace(i, filename.size()-1, ".slm");
			llstat slm_status;
			if (LLFile::stat(filename, &slm_status) == 0)
			{ //slm file exists
				llstat dae_status;
				if (LLFile::stat(mFilename, &dae_status) != 0 ||
					dae_status.st_mtime < slm_status.st_mtime)
				{
					if (loadFromSLM(filename))
					{ //slm successfully loaded, if this fails, fall through and
						//try loading from dae

						mLod = -1; //successfully loading from an slm implicitly sets all 
									//LoDs
						return true;
					}
				}
			}	
		}
	}

	return OpenFile(mFilename);
}

void LLModelLoader::setLoadState(U32 state)
{
	mStateCallback(state, mOpaqueData);
}

bool LLModelLoader::loadFromSLM(const std::string& filename)
{ 
	//only need to populate mScene with data from slm
	llstat stat;

	if (LLFile::stat(filename, &stat))
	{ //file does not exist
		return false;
	}

	S32 file_size = (S32) stat.st_size;
	
	llifstream ifstream(filename, std::ifstream::in | std::ifstream::binary);
	LLSD data;
	LLSDSerialize::fromBinary(data, ifstream, file_size);
	ifstream.close();

	//build model list for each LoD
	model_list model[LLModel::NUM_LODS];

	if (data["version"].asInteger() != SLM_SUPPORTED_VERSION)
	{  //unsupported version
		return false;
	}

	LLSD& mesh = data["mesh"];

	LLVolumeParams volume_params;
	volume_params.setType(LL_PCODE_PROFILE_SQUARE, LL_PCODE_PATH_LINE);

	for (S32 lod = 0; lod < LLModel::NUM_LODS; ++lod)
	{
		for (U32 i = 0; i < mesh.size(); ++i)
		{
			std::stringstream str(mesh[i].asString());
			LLPointer<LLModel> loaded_model = new LLModel(volume_params, (F32) lod);
			if (loaded_model->loadModel(str))
			{
				loaded_model->mLocalID = i;
				model[lod].push_back(loaded_model);

				if (lod == LLModel::LOD_HIGH)
				{
					if (!loaded_model->mSkinInfo.mJointNames.empty())
					{ 
						//check to see if rig is valid					
						critiqueRigForUploadApplicability( loaded_model->mSkinInfo.mJointNames );					
					}
					else if (mCacheOnlyHitIfRigged)
					{
						return false;
					}
				}
			}
		}
	}	

	if (model[LLModel::LOD_HIGH].empty())
	{ //failed to load high lod
		return false;
	}

	// Set name.
	std::string name = data["name"];
	if (!name.empty())
	{
		model[LLModel::LOD_HIGH][0]->mLabel = name;
	}
	

	//load instance list
	model_instance_list instance_list;

	LLSD& instance = data["instance"];

	for (U32 i = 0; i < instance.size(); ++i)
	{
		//deserialize instance list
		instance_list.push_back(LLModelInstance(instance[i]));

		//match up model instance pointers
		S32 idx = instance_list[i].mLocalMeshID;

		for (U32 lod = 0; lod < LLModel::NUM_LODS; ++lod)
		{
			if (!model[lod].empty())
			{
				if (idx >= model[lod].size())
				{
					if (model[lod].size())
					{
						instance_list[i].mLOD[lod] = model[lod][0];
					}
					else
					{
						instance_list[i].mLOD[lod] = NULL;
					}					
					continue;
				}
				instance_list[i].mLOD[lod] = model[lod][idx];
			}
		}

		if (!instance_list[i].mModel)
			instance_list[i].mModel = model[LLModel::LOD_HIGH][idx];
	}		


	//convert instance_list to mScene
	mFirstTransform = TRUE;
	for (U32 i = 0; i < instance_list.size(); ++i)
	{
		LLModelInstance& cur_instance = instance_list[i];
		mScene[cur_instance.mTransform].push_back(cur_instance);
		stretch_extents(cur_instance.mModel, cur_instance.mTransform, mExtents[0], mExtents[1], mFirstTransform);
	}
	
	setLoadState( DONE );

	return true;
}

//static
bool LLModelLoader::isAlive(LLModelLoader* loader)
{
	if(!loader)
	{
		return false ;
	}

	std::list<LLModelLoader*>::iterator iter = sActiveLoaderList.begin() ;
	for(; iter != sActiveLoaderList.end() && (*iter) != loader; ++iter) ;
	
	return *iter == loader ;
}

void LLModelLoader::loadModelCallback()
{
	mLoadCallback(mScene,mModelList,mLod, mOpaqueData);

	while (!isStopped())
	{ //wait until this thread is stopped before deleting self
		apr_sleep(100);
	}

	//double check if "this" is valid before deleting it, in case it is aborted during running.
	if(!isAlive(this))
	{
		return ;
	}

	delete this;
}

//-----------------------------------------------------------------------------
// critiqueRigForUploadApplicability()
//-----------------------------------------------------------------------------
void LLModelLoader::critiqueRigForUploadApplicability( const std::vector<std::string> &jointListFromAsset )
{
	critiqueJointToNodeMappingFromScene();
	
	//Determines the following use cases for a rig:
	//1. It is suitable for upload with skin weights & joint positions, or
	//2. It is suitable for upload as standard av with just skin weights
	
	bool isJointPositionUploadOK = isRigSuitableForJointPositionUpload( jointListFromAsset );
	bool isRigLegacyOK			 = isRigLegacy( jointListFromAsset );

	//It's OK that both could end up being true, both default to false
	if ( isJointPositionUploadOK )
	{
		setRigValidForJointPositionUpload( true );
	}

	if ( isRigLegacyOK) 
	{	
		setLegacyRigValid( true );
	}

}
//-----------------------------------------------------------------------------
// critiqueJointToNodeMappingFromScene()
//-----------------------------------------------------------------------------
void LLModelLoader::critiqueJointToNodeMappingFromScene( void  )
{
	//Do the actual nodes back the joint listing from the dae?
	//if yes then this is a fully rigged asset, otherwise it's just a partial rig
	
	JointSet::iterator jointsFromNodeIt = mJointsFromNode.begin();
	JointSet::iterator jointsFromNodeEndIt = mJointsFromNode.end();
	bool result = true;

	if ( !mJointsFromNode.empty() )
	{
		for ( ;jointsFromNodeIt!=jointsFromNodeEndIt;++jointsFromNodeIt )
		{
			std::string name = *jointsFromNodeIt;
			if ( mJointTransformMap.find( name ) != mJointTransformMap.end() )
			{
				continue;
			}
			else
			{
				LL_INFOS() <<"critiqueJointToNodeMappingFromScene is missing a: " << name << LL_ENDL;
				result = false;				
			}
		}
	}
	else
	{
		result = false;
	}

	//Determines the following use cases for a rig:
	//1. Full av rig  w/1-1 mapping from the scene and joint array
	//2. Partial rig but w/o parity between the scene and joint array
	if ( result )
	{		
		setRigWithSceneParity( true );
	}	
}
//-----------------------------------------------------------------------------
// isRigLegacy()
//-----------------------------------------------------------------------------
bool LLModelLoader::isRigLegacy( const std::vector<std::string> &jointListFromAsset )
{
	//No joints in asset
	if ( jointListFromAsset.size() == 0 )
	{
		return false;
	}

	bool result = false;

	JointSet :: const_iterator masterJointIt = mMasterLegacyJointList.begin();	
	JointSet :: const_iterator masterJointEndIt = mMasterLegacyJointList.end();
	
	std::vector<std::string> :: const_iterator modelJointIt = jointListFromAsset.begin();	
	std::vector<std::string> :: const_iterator modelJointItEnd = jointListFromAsset.end();
	
	for ( ;masterJointIt!=masterJointEndIt;++masterJointIt )
	{
		result = false;
		modelJointIt = jointListFromAsset.begin();

		for ( ;modelJointIt!=modelJointItEnd; ++modelJointIt )
		{
			if ( *masterJointIt == *modelJointIt )
			{
				result = true;
				break;
			}			
		}		
		if ( !result )
		{
			LL_INFOS() <<" Asset did not contain the joint (if you're u/l a fully rigged asset w/joint positions - it is required)." << *masterJointIt<< LL_ENDL;
			break;
		}
	}	
	return result;
}
//-----------------------------------------------------------------------------
// isRigSuitableForJointPositionUpload()
//-----------------------------------------------------------------------------
bool LLModelLoader::isRigSuitableForJointPositionUpload( const std::vector<std::string> &jointListFromAsset )
{
	bool result = false;

	JointSet :: const_iterator masterJointIt = mMasterJointList.begin();	
	JointSet :: const_iterator masterJointEndIt = mMasterJointList.end();
	
	std::vector<std::string> :: const_iterator modelJointIt = jointListFromAsset.begin();	
	std::vector<std::string> :: const_iterator modelJointItEnd = jointListFromAsset.end();
	
	for ( ;masterJointIt!=masterJointEndIt;++masterJointIt )
	{
		result = false;
		modelJointIt = jointListFromAsset.begin();

		for ( ;modelJointIt!=modelJointItEnd; ++modelJointIt )
		{
			if ( *masterJointIt == *modelJointIt )
			{
				result = true;
				break;
			}			
		}		
		if ( !result )
		{
			LL_INFOS() <<" Asset did not contain the joint (if you're u/l a fully rigged asset w/joint positions - it is required)." << *masterJointIt<< LL_ENDL;
			break;
		}
	}	
	return result;
}


//called in the main thread
void LLModelLoader::loadTextures()
{
	BOOL is_paused = isPaused() ;
	pause() ; //pause the loader 

	for(scene::iterator iter = mScene.begin(); iter != mScene.end(); ++iter)
	{
		for(U32 i = 0 ; i < iter->second.size(); i++)
		{
			for(std::map<std::string, LLImportMaterial>::iterator j = iter->second[i].mMaterial.begin();
				j != iter->second[i].mMaterial.end(); ++j)
			{
				LLImportMaterial& material = j->second;

				if(!material.mDiffuseMapFilename.empty())
				{
					mNumOfFetchingTextures += mTextureLoadFunc(material, mOpaqueData);					
				}
			}
		}
	}

	if(!is_paused)
	{
		unpause() ;
	}
}