/*
Copyright (c) 2016, Michael Kazhdan
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer. Redistributions in binary form must reproduce
the above copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the distribution. 

Neither the name of the Johns Hopkins University nor the names of its contributors
may be used to endorse or promote products derived from this software without specific
prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES 
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
*/

#include "PreProcessor.h"

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>
#include "MyMiscellany.h"
#include "CmdLineParser.h"
#include "PPolynomial.h"
#include "FEMTree.h"
#include "Ply.h"
#include "PointStreamData.h"
#include "Image.h"

cmdLineParameter< char* >
	In( "in" ) ,
	Samples( "samples" ) ,
	OutMesh( "mesh" ) ,
	OutGrid( "grid" );

cmdLineReadable
	PolygonMesh( "polygonMesh" ) ,
	NonManifold( "nonManifold" ) ,
	FlipOrientation( "flip" ) ,
	ASCII( "ascii" ) ,
	NonLinearFit( "nonLinearFit" ) ,
	PrimalGrid( "primalGrid" ) ,
	Verbose( "verbose" );

cmdLineParameter< int >
	ParallelType( "parallel" , (int)ThreadPool::OPEN_MP ) ,
	ScheduleType( "schedule" , (int)ThreadPool::DefaultSchedule ) ,
	ThreadChunkSize( "chunkSize" , (int)ThreadPool::DefaultChunkSize ) ,
	Threads( "threads" , (int)std::thread::hardware_concurrency() );

cmdLineParameter< float >
	IsoValue( "iso" , 0.f );

cmdLineReadable* params[] =
{
	&In , 
	&Samples ,
	&OutMesh , &NonManifold , &PolygonMesh , &FlipOrientation , &ASCII , &NonLinearFit , &IsoValue ,
	&OutGrid , &PrimalGrid ,
	&Threads ,
	&Verbose , 
	&ParallelType ,
	&ScheduleType ,
	&ThreadChunkSize ,
	NULL
};


void ShowUsage( char* ex )
{
	printf( "Usage: %s\n" , ex );
	printf( "\t --%s <input tree>\n" , In.name );
	printf( "\t[--%s sample positions>]\n" , Samples.name );
	printf( "\t[--%s <ouput triangle mesh>]\n" , OutMesh.name );
	printf( "\t[--%s <ouput grid>]\n" , OutGrid.name );
	printf( "\t[--%s <num threads>=%d]\n" , Threads.name , Threads.value );
	printf( "\t[--%s <parallel type>=%d]\n" , ParallelType.name , ParallelType.value );
	for( size_t i=0 ; i<ThreadPool::ParallelNames.size() ; i++ ) printf( "\t\t%d] %s\n" , (int)i , ThreadPool::ParallelNames[i].c_str() );
	printf( "\t[--%s <schedue type>=%d]\n" , ScheduleType.name , ScheduleType.value );
	for( size_t i=0 ; i<ThreadPool::ScheduleNames.size() ; i++ ) printf( "\t\t%d] %s\n" , (int)i , ThreadPool::ScheduleNames[i].c_str() );
	printf( "\t[--%s <thread chunk size>=%d]\n" , ThreadChunkSize.name , ThreadChunkSize.value );
	printf( "\t[--%s <iso-value for extraction>=%f]\n" , IsoValue.name , IsoValue.value );
	printf( "\t[--%s]\n" , NonManifold.name );
	printf( "\t[--%s]\n" , PolygonMesh.name );
	printf( "\t[--%s]\n" , NonLinearFit.name );
	printf( "\t[--%s]\n" , FlipOrientation.name );
	printf( "\t[--%s]\n" , PrimalGrid.name );
	printf( "\t[--%s]\n" , ASCII.name );
	printf( "\t[--%s]\n" , Verbose.name );
}

template< typename Real , unsigned int Dim >
void WriteGrid( ConstPointer( Real ) values , int res , const char *fileName )
{
	int resolution = 1;
	for( int d=0 ; d<Dim ; d++ ) resolution *= res;

	char *ext = GetFileExtension( fileName );

	if( Dim==2 && ImageWriter::ValidExtension( ext ) )
	{
		Real avg = 0;
		std::vector< Real > avgs( ThreadPool::NumThreads() , 0 );
		ThreadPool::Parallel_for( 0 , resolution , [&]( unsigned int thread , size_t i ){ avgs[thread] += values[i]; } );
		for( unsigned int t=0 ; t<ThreadPool::NumThreads() ; t++ ) avg += avgs[t];
		avg /= (Real)resolution;

		Real std = 0;
		std::vector< Real > stds( ThreadPool::NumThreads() , 0 );
		ThreadPool::Parallel_for( 0 , resolution , [&]( unsigned int thread , size_t i ){ stds[thread] += ( values[i] - avg ) * ( values[i] - avg ); } );
		for( unsigned int t=0 ; t<ThreadPool::NumThreads() ; t++ ) std += stds[t];
		std = (Real)sqrt( std / resolution );

		if( Verbose.set ) printf( "Grid to image: [%.2f,%.2f] -> [0,255]\n" , avg - 2*std , avg + 2*std );

		unsigned char *pixels = new unsigned char[ resolution*3 ];
		ThreadPool::Parallel_for( 0 , resolution , [&]( unsigned int , size_t i )
		{
			Real v = (Real)std::min< Real >( (Real)1. , std::max< Real >( (Real)-1. , ( values[i] - avg ) / (2*std ) ) );
			v = (Real)( ( v + 1. ) / 2. * 256. );
			unsigned char color = (unsigned char )std::min< Real >( (Real)255. , std::max< Real >( (Real)0. , v ) );
			for( int c=0 ; c<3 ; c++ ) pixels[i*3+c ] = color;
		}
		);
		ImageWriter::Write( fileName , pixels , res , res , 3 );
		delete[] pixels;
	}
	else
	{

		FILE *fp = fopen( fileName , "wb" );
		if( !fp ) ERROR_OUT( "Failed to open grid file for writing: " , fileName );
		else
		{
			fwrite( &res , sizeof(int) , 1 , fp );
			if( typeid(Real)==typeid(float) ) fwrite( values , sizeof(float) , resolution , fp );
			else
			{
				float *fValues = new float[resolution];
				for( int i=0 ; i<resolution ; i++ ) fValues[i] = float( values[i] );
				fwrite( fValues , sizeof(float) , resolution , fp );
				delete[] fValues;
			}
			fclose( fp );
		}
	}
	delete[] ext;
}

template< unsigned int Dim , class Real , unsigned int FEMSig >
void _Execute( const FEMTree< Dim , Real >* tree , XForm< Real , Dim+1 > xForm , FILE* fp )
{
	ThreadPool::Init( (ThreadPool::ParallelType)ParallelType.value , Threads.value );
	static const unsigned int Degree = FEMSignature< FEMSig >::Degree;
	DenseNodeData< Real , IsotropicUIntPack< Dim , FEMSig > > coefficients;

	coefficients.read( fp );

	// Evaluate at the sample positions
	if( Samples.set )
	{
		InputPointStream< Real , Dim > *pointStream;
		char* ext = GetFileExtension( Samples.value );
		if     ( !strcasecmp( ext , "bpts" ) ) pointStream = new BinaryInputPointStream< Real , Dim >( Samples.value );
		else if( !strcasecmp( ext , "ply"  ) ) pointStream = new    PLYInputPointStream< Real , Dim >( Samples.value );
		else                                   pointStream = new  ASCIIInputPointStream< Real , Dim >( Samples.value );
		delete[] ext;
		typename FEMTree< Dim , Real >::template MultiThreadedEvaluator< IsotropicUIntPack< Dim , FEMSig > , 0 > evaluator( tree , coefficients );
		static const unsigned int CHUNK_SIZE = 1024;
		Point< Real , Dim > points[ CHUNK_SIZE ];
		Real values[ CHUNK_SIZE ];
		size_t pointsRead;
		while( ( pointsRead=pointStream->nextPoints( points , CHUNK_SIZE ) ) )
		{
			ThreadPool::Parallel_for( 0 , pointsRead , [&]( unsigned int thread , size_t j )
			{
				Point< Real , Dim > p = xForm * points[j];
				bool inBounds = true;
				for( int d=0 ; d<Dim ; d++ ) if( p[d]<0 || p[d]>1 ) inBounds = false;
				if( inBounds ) values[j] = evaluator.values( xForm * points[j] , thread )[0];
				else           values[j] = (Real)nan( "" );
			}
			);
			for( int j=0 ; j<pointsRead ; j++ ) printf( "%g %g %g\n" , points[j][0] , points[j][1] , values[j] );
		}

		delete pointStream;
	}

	// Output the grid
	if( OutGrid.set )
	{
		int res = 0;
		double t = Time();
		Pointer( Real ) values = tree->template regularGridEvaluate< true >( coefficients , res , -1 , PrimalGrid.set );
		if( Verbose.set ) printf( "Got grid: %.2f(s)\n" , Time()-t );
		WriteGrid< Real , Dim >( values , res , OutGrid.value );
		DeletePointer( values );
	}

	// Output the mesh
	if( OutMesh.set )
	{
		double t = Time();
		typedef PlyVertex< Real , Dim > Vertex;
		CoredFileMeshData< Vertex , node_index_type > mesh;
		std::function< void ( Vertex& , Point< Real , Dim > , Real , Real ) > SetVertex = []( Vertex& v , Point< Real , Dim > p , Real , Real ){ v.point = p; };
#if defined( __GNUC__ ) && __GNUC__ < 5
#warning "you've got me gcc version<5"
		static const unsigned int DataSig = FEMDegreeAndBType< 0 , BOUNDARY_FREE >::Signature;
		IsoSurfaceExtractor< Dim , Real , Vertex >::template Extract< Real >( IsotropicUIntPack< Dim , FEMSig >() , UIntPack< 0 >() , UIntPack< FEMTrivialSignature >() , *tree , ( typename FEMTree< Dim , Real >::template DensityEstimator< 0 >* )NULL , ( SparseNodeData< ProjectiveData< Real , Real > , IsotropicUIntPack< Dim , DataSig > > * )NULL , coefficients , IsoValue.value , mesh , SetVertex , NonLinearFit.set , !NonManifold.set , PolygonMesh.set , FlipOrientation.set );
#else // !__GNUC__ || __GNUC__ >=5
		IsoSurfaceExtractor< Dim , Real , Vertex >::template Extract< Real >( IsotropicUIntPack< Dim , FEMSig >() , UIntPack< 0 >() , UIntPack< FEMTrivialSignature >() , *tree , ( typename FEMTree< Dim , Real >::template DensityEstimator< 0 >* )NULL , NULL , coefficients , IsoValue.value , mesh , SetVertex , NonLinearFit.set , !NonManifold.set , PolygonMesh.set , FlipOrientation.set );
#endif // __GNUC__ || __GNUC__ < 4

		if( Verbose.set ) printf( "Got iso-surface: %.2f(s)\n" , Time()-t );
		if( Verbose.set ) printf( "Vertices / Polygons: %llu / %llu\n" , (unsigned long long)( mesh.outOfCorePointCount()+mesh.inCorePoints.size() ) , (unsigned long long)mesh.polygonCount() );

		std::vector< std::string > comments;
		if( !PlyWritePolygons< Vertex , node_index_type , Real , Dim >( OutMesh.value , &mesh , ASCII.set ? PLY_ASCII : PLY_BINARY_NATIVE , comments , xForm.inverse() ) )
			ERROR_OUT( "Could not write mesh to: " , OutMesh.value );
	}
}


template< unsigned int Dim , class Real >
void Execute( FILE* fp , int degree , BoundaryType bType )
{
	XForm< Real , Dim+1 > xForm;
	FEMTree< Dim , Real > tree( fp , xForm , MEMORY_ALLOCATOR_BLOCK_SIZE );

	if( Verbose.set ) printf( "Leaf Nodes / Active Nodes / Ghost Nodes: %llu / %llu / %llu\n" , (unsigned long long)tree.leaves() , (unsigned long long)tree.nodes() , (unsigned long long)tree.ghostNodes() );

	switch( bType )
	{
	case BOUNDARY_FREE:
	{
		switch( degree )
		{
			case 1: _Execute< Dim , Real , FEMDegreeAndBType< 1 , BOUNDARY_FREE >::Signature >( &tree , xForm , fp ) ; break;
			case 2: _Execute< Dim , Real , FEMDegreeAndBType< 2 , BOUNDARY_FREE >::Signature >( &tree , xForm , fp ) ; break;
			case 3: _Execute< Dim , Real , FEMDegreeAndBType< 3 , BOUNDARY_FREE >::Signature >( &tree , xForm , fp ) ; break;
			case 4: _Execute< Dim , Real , FEMDegreeAndBType< 4 , BOUNDARY_FREE >::Signature >( &tree , xForm , fp ) ; break;
			default: ERROR_OUT( "Only B-Splines of degree 1 - 4 are supported" );
		}
	}
	break;
	case BOUNDARY_NEUMANN:
	{
		switch( degree )
		{
			case 1: _Execute< Dim , Real , FEMDegreeAndBType< 1 , BOUNDARY_NEUMANN >::Signature >( &tree , xForm , fp ) ; break;
			case 2: _Execute< Dim , Real , FEMDegreeAndBType< 2 , BOUNDARY_NEUMANN >::Signature >( &tree , xForm , fp ) ; break;
			case 3: _Execute< Dim , Real , FEMDegreeAndBType< 3 , BOUNDARY_NEUMANN >::Signature >( &tree , xForm , fp ) ; break;
			case 4: _Execute< Dim , Real , FEMDegreeAndBType< 4 , BOUNDARY_NEUMANN >::Signature >( &tree , xForm , fp ) ; break;
			default: ERROR_OUT( "Only B-Splines of degree 1 - 4 are supported" );
		}
	}
	break;
	case BOUNDARY_DIRICHLET:
	{
		switch( degree )
		{
			case 1: _Execute< Dim , Real , FEMDegreeAndBType< 1 , BOUNDARY_DIRICHLET >::Signature >( &tree , xForm , fp ) ; break;
			case 2: _Execute< Dim , Real , FEMDegreeAndBType< 2 , BOUNDARY_DIRICHLET >::Signature >( &tree , xForm , fp ) ; break;
			case 3: _Execute< Dim , Real , FEMDegreeAndBType< 3 , BOUNDARY_DIRICHLET >::Signature >( &tree , xForm , fp ) ; break;
			case 4: _Execute< Dim , Real , FEMDegreeAndBType< 4 , BOUNDARY_DIRICHLET >::Signature >( &tree , xForm , fp ) ; break;
			default: ERROR_OUT( "Only B-Splines of degree 1 - 4 are supported" );
		}
	}
	break;
	default: ERROR_OUT( "Not a valid boundary type: " , bType );
	}
}

int main( int argc , char* argv[] )
{
#ifdef ARRAY_DEBUG
	WARN( "Array debugging enabled" );
#endif // ARRAY_DEBUG
	cmdLineParse( argc-1 , &argv[1] , params );
	ThreadPool::DefaultChunkSize = ThreadChunkSize.value;
	ThreadPool::DefaultSchedule = (ThreadPool::ScheduleType)ScheduleType.value;
	if( Verbose.set )
	{
		printf( "**************************************************\n" );
		printf( "**************************************************\n" );
		printf( "** Running Octree Visualization (Version %s) **\n" , VERSION );
		printf( "**************************************************\n" );
		printf( "**************************************************\n" );
		if( !Threads.set ) printf( "Running with %d threads\n" , Threads.value );
	}

	if( !In.set )
	{
		ShowUsage( argv[0] );
		return EXIT_FAILURE;
	}
	FILE* fp = fopen( In.value , "rb" );
	if( !fp ) ERROR_OUT( "Failed to open file for reading: " , In.value );
	FEMTreeRealType realType ; int degree ; BoundaryType bType;
	unsigned int dimension;
	ReadFEMTreeParameter( fp , realType , dimension );
	{
		unsigned int dim = dimension;
		unsigned int* sigs = ReadDenseNodeDataSignatures( fp , dim );
		if( dimension!=dim ) ERROR_OUT( "Octree and node data dimensions don't math: " , dimension , " != " , dim );
		for( unsigned int d=1 ; d<dim ; d++ ) if( sigs[0]!=sigs[d] ) ERROR_OUT( "Anisotropic signatures" );
		degree = FEMSignatureDegree( sigs[0] );
		bType = FEMSignatureBType( sigs[0] );
		delete[] sigs;
	}
	if( Verbose.set ) printf( "%d-dimension , %s-precision , degree-%d , %s-boundary\n" , dimension , FEMTreeRealNames[ realType ] , degree , BoundaryNames[ bType ] );

	switch( dimension )
	{
	case 2:
		switch( realType )
		{
			case FEM_TREE_REAL_FLOAT:  Execute< 2 , float  >( fp , degree , bType ) ; break;
			case FEM_TREE_REAL_DOUBLE: Execute< 2 , double >( fp , degree , bType ) ; break;
			default: ERROR_OUT( "Unrecognized real type: " , realType );
		}
		break;
	case 3:
		switch( realType )
		{
			case FEM_TREE_REAL_FLOAT:  Execute< 3 , float  >( fp , degree , bType ) ; break;
			case FEM_TREE_REAL_DOUBLE: Execute< 3 , double >( fp , degree , bType ) ; break;
			default: ERROR_OUT( "Unrecognized real type: " , realType );
		}
		break;
	default: ERROR_OUT( "Only dimensions 1-4 supported" );
	}

	fclose( fp );
	return EXIT_SUCCESS;
}