/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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*/

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

#include <assimp/ParsingUtils.h>
#include <assimp/IOStreamBuffer.h>
#include <vector>

namespace Assimp {

//pre-declaration
class PLYImporter;

// 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 triangle-strip description (index table)
    EEST_TriStrip,

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

    //! The element is a material description
    EEST_Material,

    //! texture path
    EEST_TextureFile,

    //! 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() AI_NO_EXCEPT
    : eType (EDT_Int)
    , Semantic()
    , bIsList(false)
    , eFirstType(EDT_UChar) {
        // empty
    }

    //! 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 value is false
    //! if the input string is NOT a valid property (E.g. does
    //! not start with the "property" keyword)
    static bool ParseProperty(std::vector<char> &buffer, Property* pOut);

    // -------------------------------------------------------------------
    //! Parse a data type from a string
    static EDataType ParseDataType(std::vector<char> &buffer);

    // -------------------------------------------------------------------
    //! Parse a semantic from a string
    static ESemantic ParseSemantic(std::vector<char> &buffer);
};

// ---------------------------------------------------------------------------------
/** \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() AI_NO_EXCEPT
    : eSemantic (EEST_INVALID)
    , NumOccur(0) {
        // empty
    }

    //! 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(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, Element* pOut);

    // -------------------------------------------------------------------
    //! Parse a semantic from a string
    static EElementSemantic ParseSemantic(std::vector<char> &buffer);
};

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

    //! Default constructor
    PropertyInstance() AI_NO_EXCEPT {
        // empty
    }

    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 properties
    std::vector<ValueUnion> avList;

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

    // -------------------------------------------------------------------
    //! Parse a property instance in binary format
    static bool ParseInstanceBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
        const char* &pCur, unsigned int &bufferSize, 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* &pCur, EDataType eType, ValueUnion* out);

    // -------------------------------------------------------------------
    //! Parse a binary value
    static bool ParseValueBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
        const char* &pCur, unsigned int &bufferSize, 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()  AI_NO_EXCEPT
    : alProperties() {
        // empty
    }

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

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

    // -------------------------------------------------------------------
    //! Parse a binary element instance
    static bool ParseInstanceBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
        const char* &pCur, unsigned int &bufferSize, 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() AI_NO_EXCEPT
    : alInstances() {
        // empty
    }

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

    // -------------------------------------------------------------------
    //! Parse an element instance list
    static bool ParseInstanceList(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
        const Element* pcElement, ElementInstanceList* p_pcOut, PLYImporter* loader);

    // -------------------------------------------------------------------
    //! Parse a binary element instance list
    static bool ParseInstanceListBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer,
        const char* &pCur, unsigned int &bufferSize, const Element* pcElement, ElementInstanceList* p_pcOut, PLYImporter* loader, 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() AI_NO_EXCEPT
    : alElements()
    , alElementData() {

    }


    //! 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(IOStreamBuffer<char> &streamBuffer, DOM* p_pcOut, PLYImporter* loader);
    static bool ParseInstanceBinary(IOStreamBuffer<char> &streamBuffer, DOM* p_pcOut, PLYImporter* loader, bool p_bBE);

    //! Skip all comment lines after this
    static bool SkipComments(std::vector<char> &buffer);

    static bool SkipSpaces(std::vector<char> &buffer);

    static bool SkipLine(std::vector<char> &buffer);

    static bool TokenMatch(std::vector<char> &buffer, const char* token, unsigned int len);

    static bool SkipSpacesAndLineEnd(std::vector<char> &buffer);

private:

    // -------------------------------------------------------------------
    //! Handle the file header and read all element descriptions
    bool ParseHeader(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, bool p_bBE);

    // -------------------------------------------------------------------
    //! Read in all element instance lists
    bool ParseElementInstanceLists(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, PLYImporter* loader);

    // -------------------------------------------------------------------
    //! Read in all element instance lists for a binary file format
    bool ParseElementInstanceListsBinary(IOStreamBuffer<char> &streamBuffer, std::vector<char> &buffer, const char* &pCur, unsigned int &bufferSize, PLYImporter* loader, bool p_bBE);
};

// ---------------------------------------------------------------------------------
template <typename TYPE>
inline 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;
    default: ;
    };
    return (TYPE)0;
}

} // Namespace PLY
} // Namespace AssImp

#endif // !! include guard
