/*
Free Asset Import Library (ASSIMP)
----------------------------------------------------------------------

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

Redistribution and use of this software 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 ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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,
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

----------------------------------------------------------------------
*/


/** @file Defines the helper data structures for importing PLY files  */
#ifndef AI_PLYFILEHELPER_H_INC
#define AI_PLYFILEHELPER_H_INC

#include <string>
#include <vector>
#include <list>
#include <sstream>

#include "../include/aiTypes.h"
#include "../include/aiMesh.h"
#include "../include/aiAnim.h"

namespace Assimp
{

// http://local.wasp.uwa.edu.au/~pbourke/dataformats/ply/
// http://w3.impa.br/~lvelho/outgoing/sossai/old/ViHAP_D4.4.2_PLY_format_v1.1.pdf
// http://www.okino.com/conv/exp_ply.htm
namespace PLY
{


// ---------------------------------------------------------------------------------
/*
name        type        number of bytes
---------------------------------------
char       character                 1
uchar      unsigned character        1
short      short integer             2
ushort     unsigned short integer    2
int        integer                   4
uint       unsigned integer          4
float      single-precision float    4
double     double-precision float    8

int8
int16
uint8 ... forms are also used
*/
enum EDataType
{
	EDT_Char = 0x0u,
	EDT_UChar,
	EDT_Short,
	EDT_UShort,
	EDT_Int,
	EDT_UInt,
	EDT_Float,
	EDT_Double,

	// Marks invalid entries
	EDT_INVALID
};

// ---------------------------------------------------------------------------------
/** \brief Specifies semantics for PLY element properties
 *
 * Semantics define the usage of a property, e.g. x coordinate
*/
enum ESemantic
{
	//! vertex position x coordinate
	EST_XCoord = 0x0u,
	//! vertex position x coordinate
	EST_YCoord,
	//! vertex position x coordinate
	EST_ZCoord,

	//! vertex normal x coordinate
	EST_XNormal,
	//! vertex normal y coordinate
	EST_YNormal,
	//! vertex normal z coordinate
	EST_ZNormal,

	//! u texture coordinate
	EST_UTextureCoord,
	//! v texture coordinate
	EST_VTextureCoord,
	
	//! vertex colors, red channel
	EST_Red,		
	//! vertex colors, green channel
	EST_Green,
	//! vertex colors, blue channel
	EST_Blue,
	//! vertex colors, alpha channel
	EST_Alpha,

	//! vertex index list 
	EST_VertexIndex,

	//! texture index 
	EST_TextureIndex,

	//! texture coordinates (stored as element of a face)
	EST_TextureCoordinates,

	//! material index 
	EST_MaterialIndex,

	//! ambient color, red channel
	EST_AmbientRed,
	//! ambient color, green channel
	EST_AmbientGreen,
	//! ambient color, blue channel
	EST_AmbientBlue,
	//! ambient color, alpha channel
	EST_AmbientAlpha,

	//! diffuse color, red channel
	EST_DiffuseRed,
	//! diffuse color, green channel
	EST_DiffuseGreen,
	//! diffuse color, blue channel
	EST_DiffuseBlue,
	//! diffuse color, alpha channel
	EST_DiffuseAlpha,

	//! specular color, red channel
	EST_SpecularRed,
	//! specular color, green channel
	EST_SpecularGreen,
	//! specular color, blue channel
	EST_SpecularBlue,
	//! specular color, alpha channel
	EST_SpecularAlpha,

	//! specular power for phong shading
	EST_PhongPower,

	//! opacity between 0 and 1
	EST_Opacity,

	//! Marks invalid entries
	EST_INVALID
};

// ---------------------------------------------------------------------------------
/** \brief Specifies semantics for PLY elements
 *
 * Semantics define the usage of an element, e.g. vertex or material
*/
enum EElementSemantic
{
	//! The element is a vertex
	EEST_Vertex	= 0x0u,

	//! The element is a face description (index table)
	EEST_Face,

	//! The element is a tristrip description (index table)
	EEST_TriStrip,

	//! The element is an edge description (ignored)
	EEST_Edge,

	//! The element is a material description 
	EEST_Material,

	//! Marks invalid entries
	EEST_INVALID
};

// ---------------------------------------------------------------------------------
/** \brief Helper class for a property in a PLY file.
 *
 * This can e.g. be a part of the vertex declaration
 */
class Property
{
public:

	//! Default constructor
	Property()
		: eType (EDT_Int), bIsList(false), eFirstType(EDT_UChar)
	{}

	//!	Data type of the property
	EDataType eType;

	//!	Semantical meaning of the property
	ESemantic Semantic;

	//! Of the semantic of the property could not be parsed:
	//! Contains the semantic specified in the file
	std::string szName;

	//!	Specifies whether the data type is a list where
	//! the first element specifies the size of the list
	bool bIsList;
	EDataType eFirstType;

	// -------------------------------------------------------------------
	//! Parse a property from a string. The end of the
	//! string is either '\n', '\r' or '\0'. Return valie is false
	//! if the input string is NOT a valid property (E.g. does
	//! not start with the "property" keyword)
	static bool ParseProperty (const char* p_szIn, const char** p_szOut, 
		Property* pOut);

	// -------------------------------------------------------------------
	//! Parse a data type from a string
	static EDataType ParseDataType(const char* p_szIn,const char** p_szOut);

	// -------------------------------------------------------------------
	//! Parse a semantic from a string
	static ESemantic ParseSemantic(const char* p_szIn,const char** p_szOut);
};

// ---------------------------------------------------------------------------------
/** \brief Helper class for an element in a PLY file.
 *
 * This can e.g. be the vertex declaration. Elements contain a
 * well-defined number of properties.
 */
class Element
{
public:

	//! Default constructor
	Element()
		: NumOccur(0), eSemantic (EEST_INVALID)
	{}

	//! Destructor. Dallocates all storage
	~Element()
	{
		// delete all elements
		for (std::vector<Property*>::const_iterator
			i =  this->alProperties.begin();
			i != this->alProperties.end();++i)
		{
			delete (*i);
		}
		return;
	}

	//! List of properties assigned to the element
	//! std::vector to support operator[]
	std::vector<Property*> alProperties;

	//! Semantic of the element
	EElementSemantic eSemantic;

	//! Of the semantic of the element could not be parsed:
	//! Contains the semantic specified in the file
	std::string szName;

	//! How many times will the element occur?
	unsigned int NumOccur;


	// -------------------------------------------------------------------
	//! Parse an element from a string. 
	//! The function will parse all properties contained in the
	//! element, too.
	static bool ParseElement (const char* p_szIn, const char** p_szOut, 
		Element* pOut);

	// -------------------------------------------------------------------
	//! Parse a semantic from a string
	static EElementSemantic ParseSemantic(const char* p_szIn,
		const char** p_szOut);
};

// ---------------------------------------------------------------------------------
/** \brief Instance of a property in a PLY file
 */
class PropertyInstance 
{
public:

	//! Default constructor
	PropertyInstance ()
	{}

	union ValueUnion
	{

		//! uInt32 representation of the property. All
		// uint types are automatically converted to uint32
		uint32_t iUInt;

		//! Int32 representation of the property. All
		// int types are automatically converted to int32
		int32_t iInt;

		//! Float32 representation of the property
		float fFloat;

		//! Float64 representation of the property
		double fDouble;

	};

	// -------------------------------------------------------------------
	//! List of all values parsed. Contains only one value
	// for non-list propertys
	std::list<ValueUnion> avList;

	// -------------------------------------------------------------------
	//! Parse a property instance 
	static bool ParseInstance (const char* p_szIn,const char** p_szOut,
		const Property* prop, PropertyInstance* p_pcOut);

	// -------------------------------------------------------------------
	//! Parse a property instance in binary format
	static bool ParseInstanceBinary (const char* p_szIn,const char** p_szOut,
		const Property* prop, PropertyInstance* p_pcOut,bool p_bBE);

	// -------------------------------------------------------------------
	//! Get the default value for a given data type
	static ValueUnion DefaultValue(EDataType eType);

	// -------------------------------------------------------------------
	//! Parse a value
	static bool ParseValue(const char* p_szIn,const char** p_szOut,
		EDataType eType,ValueUnion* out);

	// -------------------------------------------------------------------
	//! Parse a binary value
	static bool ParseValueBinary(const char* p_szIn,const char** p_szOut,
		EDataType eType,ValueUnion* out,bool p_bBE);

	// -------------------------------------------------------------------
	//! Convert a property value to a given type TYPE
	template <typename TYPE>
	static TYPE ConvertTo(ValueUnion v, EDataType eType);
};

// ---------------------------------------------------------------------------------
/** \brief Class for an element instance in a PLY file
 */
class ElementInstance 
{
public:

	//! Default constructor
	ElementInstance ()
	{}

	//! List of all parsed properties
	std::vector< PropertyInstance > alProperties;

	// -------------------------------------------------------------------
	//! Parse an element instance
	static bool ParseInstance (const char* p_szIn,const char** p_szOut,
		const Element* pcElement, ElementInstance* p_pcOut);

	// -------------------------------------------------------------------
	//! Parse a binary element instance
	static bool ParseInstanceBinary (const char* p_szIn,const char** p_szOut,
		const Element* pcElement, ElementInstance* p_pcOut,bool p_bBE);
};

// ---------------------------------------------------------------------------------
/** \brief Class for an element instance list in a PLY file
 */
class ElementInstanceList 
{
public:

	//! Default constructor
	ElementInstanceList ()
	{}

	//! Construction from a given element description
	ElementInstanceList (const Element* pc)
	{
		// reserve enough storage to speedup the process
		alInstances.resize(pc->NumOccur);
	}

	//! Destructor. Dallocates all storage
	~ElementInstanceList()
	{
		// delete all elements
		for (std::vector<ElementInstance*>::const_iterator
			i =  this->alInstances.begin();
			i != this->alInstances.end();++i)
		{
			delete (*i);
		}
		return;
	}

	//! List of all element instances
	std::vector< ElementInstance* > alInstances;

	// -------------------------------------------------------------------
	//! Parse an element instance list
	static bool ParseInstanceList (const char* p_szIn,const char** p_szOut,
		const Element* pcElement, ElementInstanceList* p_pcOut);

	// -------------------------------------------------------------------
	//! Parse a binary element instance list
	static bool ParseInstanceListBinary (const char* p_szIn,const char** p_szOut,
		const Element* pcElement, ElementInstanceList* p_pcOut,bool p_bBE);
};
// ---------------------------------------------------------------------------------
/** \brief Class to represent the document object model of an ASCII or binary 
 * (both little and big-endian) PLY file
 */
class DOM
{
public:

	//! Default constructor
	DOM()
	{}

	//! Destructor. Dallocates all storage
	~DOM()
	{
		// delete all elements
		for (std::vector<Element*>::const_iterator
			i =  this->alElements.begin();
			i != this->alElements.end();++i)
		{
			delete (*i);
		}
		// delete all instance lists
		for (std::vector<ElementInstanceList*>::const_iterator
			i =  this->alElementData.begin();
			i != this->alElementData.end();++i)
		{
			delete (*i);
		}
		return;
	}

	//! Contains all elements of the file format
	std::vector<Element*> alElements;
	//! Contains the real data of each element's instance list
	std::vector<ElementInstanceList*> alElementData;

	//! Parse the DOM for a PLY file. The input string is assumed
	//! to be terminated with zero
	static bool ParseInstance (const char* p_szIn,DOM* p_pcOut, unsigned int iLen);
	static bool ParseInstanceBinary (const char* p_szIn,
		DOM* p_pcOut,bool p_bBE,  unsigned int iLen);

	//! Skip all comment lines after this
	static bool SkipComments (const char* p_szIn,const char** p_szOut);

private:

	// -------------------------------------------------------------------
	//! Handle the file header and read all element descriptions
	bool ParseHeader (const char* p_szIn,const char** p_szOut);

	// -------------------------------------------------------------------
	//! Read in all element instance lists
	bool ParseElementInstanceLists (const char* p_szIn,const char** p_szOut);

	// -------------------------------------------------------------------
	//! Read in all element instance lists for a binary file format
	bool ParseElementInstanceListsBinary (const char* p_szIn,
		const char** p_szOut,bool p_bBE);
};

// ---------------------------------------------------------------------------------
/** \brief Helper class to represent a loaded PLY face
 */
class Face
{
public:

	Face()
		: iMaterialIndex(0xFFFFFFFF)
	{
		// set all indices to zero by default
		mIndices.resize(3,0);
	}

public:

	//! List of vertex indices
	std::vector<unsigned int> mIndices;

	//! Material index
	unsigned int iMaterialIndex;
};

// ---------------------------------------------------------------------------------
template <typename TYPE>
TYPE PLY::PropertyInstance::ConvertTo(
	PLY::PropertyInstance::ValueUnion v, PLY::EDataType eType)
{
	switch (eType)
	{
	case EDT_Float:
		return (TYPE)v.fFloat;
	case EDT_Double:
		return (TYPE)v.fDouble;

	case EDT_UInt:
	case EDT_UShort:
	case EDT_UChar:
		return (TYPE)v.iUInt;

	case EDT_Int:
	case EDT_Short:
	case EDT_Char:
		return (TYPE)v.iInt;
	};
	return (TYPE)0;
}
};

// ---------------------------------------------------------------------------------
inline bool IsSpace( const char in)
{
	return (in == ' ' || in == '\t');
}
// ---------------------------------------------------------------------------------
inline bool IsLineEnd( const char in)
{
	return (in == '\r' || in == '\n' || in == '\0');
}
// ---------------------------------------------------------------------------------
inline bool IsSpaceOrNewLine( const char in)
{
	return IsSpace(in) || IsLineEnd(in);
}
// ---------------------------------------------------------------------------------
inline bool SkipSpaces( const char* in, const char** out)
{
	while (*in == ' ' || *in == '\t')in++;
	*out = in;
	return !IsLineEnd(*in);
}
// ---------------------------------------------------------------------------------
inline bool SkipLine( const char* in, const char** out)
{
	while (*in != '\r' && *in != '\n' && *in != '\0')in++;

	if (*in == '\0')
	{
		*out = in;
		return false;
	}
	in++;
	*out = in;
	return true;
}
// ---------------------------------------------------------------------------------
inline void SkipSpacesAndLineEnd( const char* in, const char** out)
{
	while (*in == ' ' || *in == '\t' || *in == '\r' || *in == '\n')in++;
	*out = in;
}
};

#endif // !! include guard