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

Copyright (c) 2006-2010, 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,
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 "AssimpPCH.h"
#ifndef ASSIMP_BUILD_NO_OBJ_IMPORTER

#include "ObjFileParser.h"
#include "ObjFileMtlImporter.h"
#include "ObjTools.h"
#include "ObjFileData.h"
#include "fast_atof.h"
#include "../include/aiTypes.h"
#include "DefaultIOSystem.h"

#if defined(__QNXNTO__)
#include <stdlib.h>
#endif

namespace Assimp
{

// -------------------------------------------------------------------
const std::string ObjFileParser::DEFAULT_MATERIAL = AI_DEFAULT_MATERIAL_NAME;
// fix: changed that to our standard default name

// -------------------------------------------------------------------
//    Constructor with loaded data and directories.
ObjFileParser::ObjFileParser(std::vector<char> &Data,const std::string &strModelName, IOSystem *io ) :
    m_DataIt(Data.begin()),
    m_DataItEnd(Data.end()),
    m_pModel(NULL),
    m_uiLine(0),
    m_pIO( io )
{
    // Create the model instance to store all the data
    m_pModel = new ObjFile::Model();
    m_pModel->m_ModelName = strModelName;

    m_pModel->m_pDefaultMaterial = new ObjFile::Material();
    m_pModel->m_pDefaultMaterial->MaterialName.Set( DEFAULT_MATERIAL );
    m_pModel->m_MaterialLib.push_back( DEFAULT_MATERIAL );
    m_pModel->m_MaterialMap[ DEFAULT_MATERIAL ] = m_pModel->m_pDefaultMaterial;

    // Start parsing the file
    parseFile();
}

// -------------------------------------------------------------------
//    Destrcutor.
ObjFileParser::~ObjFileParser()
{
    delete m_pModel->m_pDefaultMaterial;
    m_pModel->m_pDefaultMaterial = NULL;

    delete m_pModel;
    m_pModel = NULL;
}

// -------------------------------------------------------------------
//    Returns a pointer to the model instance.
ObjFile::Model *ObjFileParser::GetModel() const
{
    return m_pModel;
}

// -------------------------------------------------------------------
//    File parsing method.
void ObjFileParser::parseFile()
{
    if (m_DataIt == m_DataItEnd)
        return;

    while (m_DataIt != m_DataItEnd)
    {
        switch (*m_DataIt)
        {
        case 'v': // Parse a vertex texture coordinate
            {
                ++m_DataIt;
                if (*m_DataIt == ' ')
                {
                    // Read in vertex definition
                    getVector3(m_pModel->m_Vertices);
                }
                else if (*m_DataIt == 't')
                {
                    // Read in texture coordinate (2D)
                    ++m_DataIt;
                    getVector2(m_pModel->m_TextureCoord);
                }
                else if (*m_DataIt == 'n')
                {
                    // Read in normal vector definition
                    ++m_DataIt;
                    getVector3( m_pModel->m_Normals );
                }
            }
            break;

        case 'f': // Parse a face
            {
                getFace();
            }
            break;

        case '#': // Parse a comment
            {
                getComment();
            }
            break;

        case 'u': // Parse a material desc. setter
            {
                getMaterialDesc();
            }
            break;

        case 'm': // Parse a material library
            {
                getMaterialLib();
            }
            break;

        case 'g': // Parse group name
            {
                getGroupName();
            }
            break;

        case 's': // Parse group number
            {
                getGroupNumber();
            }
            break;

        case 'o': // Parse object name
            {
                getObjectName();
            }
            break;

        default:
            {
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;
        }
    }
}

// -------------------------------------------------------------------
//    Copy the next word in a temporary buffer
void ObjFileParser::copyNextWord(char *pBuffer, size_t length)
{
    size_t index = 0;
    m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
    while ( !isSeparator(*m_DataIt) && m_DataIt != m_DataItEnd )
    {
        pBuffer[index] = *m_DataIt;
        index++;
        if (index == length-1)
            break;
        ++m_DataIt;
    }
    pBuffer[index] = '\0';
}

// -------------------------------------------------------------------
// Copy the next line into a temporary buffer
void ObjFileParser::copyNextLine(char *pBuffer, size_t length)
{
    size_t index = 0;
    while (m_DataIt != m_DataItEnd)
    {
        if (*m_DataIt == '\n' || *m_DataIt == '\r' || index == length-1)
            break;

        pBuffer[ index ] = *m_DataIt;
        ++index;
        ++m_DataIt;
    }
    pBuffer[ index ] = '\0';
}

// -------------------------------------------------------------------
//    Get values for a new 3D vector instance
void ObjFileParser::getVector3(std::vector<aiVector3D> &point3d_array)
{
    float x, y, z;
    copyNextWord(m_buffer, BUFFERSIZE);
    x = (float) fast_atof(m_buffer);

    copyNextWord(m_buffer, BUFFERSIZE);
    y = (float) fast_atof(m_buffer);

    copyNextWord(m_buffer, BUFFERSIZE);
    z = (float) fast_atof(m_buffer);

    point3d_array.push_back( aiVector3D( x, y, z ) );
    //skipLine();
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//    Get values for a new 2D vector instance
void ObjFileParser::getVector2( std::vector<aiVector2D> &point2d_array )
{
    float x, y;
    copyNextWord(m_buffer, BUFFERSIZE);
    x = (float) fast_atof(m_buffer);

    copyNextWord(m_buffer, BUFFERSIZE);
    y = (float) fast_atof(m_buffer);

    point2d_array.push_back(aiVector2D(x, y));

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//    Get values for a new face instance
void ObjFileParser::getFace()
{
    copyNextLine(m_buffer, BUFFERSIZE);
    if (m_DataIt == m_DataItEnd)
        return;

    char *pPtr = m_buffer;
    char *pEnd = &pPtr[BUFFERSIZE];
    pPtr = getNextToken<char*>(pPtr, pEnd);
    if (pPtr == '\0')
        return;

    std::vector<unsigned int> *pIndices = new std::vector<unsigned int>;
    std::vector<unsigned int> *pTexID = new std::vector<unsigned int>;
    std::vector<unsigned int> *pNormalID = new std::vector<unsigned int>;
    bool hasNormal = false;

    bool vt = (!m_pModel->m_TextureCoord.empty());
    bool vn = (!m_pModel->m_Normals.empty());
    int iStep = 0, iPos = 0;
    while (pPtr != pEnd)
    {
        iStep = 1;
        if (*pPtr == '\0')
            break;

        if (*pPtr=='\r')
            break;

        if (*pPtr=='/' )
        {
            if (iPos == 0)
            {
                //if there are no texturecoordinates in the obj file but normals
                if (!vt && vn) {
                    iPos = 1;
                    iStep++;
                }
            }
            iPos++;
        }
        else if ( isSeparator(*pPtr) )
        {
            iPos = 0;
        }
        else
        {
            //OBJ USES 1 Base ARRAYS!!!!
            const int iVal = atoi( pPtr );
            int tmp = iVal;
            while ( ( tmp = tmp / 10 )!=0 )
                ++iStep;

            if ( iVal > 0 )
            {
                // Store parsed index
                if ( 0 == iPos )
                {
                    pIndices->push_back( iVal-1 );
                }
                else if ( 1 == iPos )
                {
                    pTexID->push_back( iVal-1 );
                }
                else if ( 2 == iPos )
                {
                    pNormalID->push_back( iVal-1 );
                    hasNormal = true;
                }
                else
                {
                    reportErrorTokenInFace();
                }
            }
        }
        for ( int i=0; i<iStep; i++ )
            ++pPtr;
    }

    ObjFile::Face *face = new ObjFile::Face( pIndices, pNormalID, pTexID );

    // Set active material, if one set
    if (NULL != m_pModel->m_pCurrentMaterial)
        face->m_pMaterial = m_pModel->m_pCurrentMaterial;
    else
        face->m_pMaterial = m_pModel->m_pDefaultMaterial;

    // Create a default object, if nothing there
    if ( NULL == m_pModel->m_pCurrent )
        createObject( "defaultobject" );

    // Assign face to mesh
    if ( NULL == m_pModel->m_pCurrentMesh )
    {
        createMesh();
    }

    // Store the face
    m_pModel->m_pCurrentMesh->m_Faces.push_back( face );
    m_pModel->m_pCurrentMesh->m_uiNumIndices += (unsigned int)face->m_pVertices->size();
    m_pModel->m_pCurrentMesh->m_uiUVCoordinates[ 0 ] += (unsigned int)face->m_pTexturCoords[0].size();
    if ( !m_pModel->m_pCurrentMesh->m_hasNormals && hasNormal )
    {
        m_pModel->m_pCurrentMesh->m_hasNormals = true;
    }
    // Skip the rest of the line
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//    Get values for a new material description
void ObjFileParser::getMaterialDesc()
{
    // Get next data for material data
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    if (m_DataIt == m_DataItEnd)
        return;

    char *pStart = &(*m_DataIt);
    while ( !isSeparator(*m_DataIt) && m_DataIt != m_DataItEnd )
        ++m_DataIt;

    // Get name
    std::string strName(pStart, &(*m_DataIt));
    if ( strName.empty())
        return;

    // Search for material
    std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find( strName );
    if ( it == m_pModel->m_MaterialMap.end() )
    {
        // Not found, use default material
        m_pModel->m_pCurrentMaterial = m_pModel->m_pDefaultMaterial;
    }
    else
    {
        // Found, using detected material
        m_pModel->m_pCurrentMaterial = (*it).second;
        if ( needsNewMesh( strName ))
        {
            createMesh();
        }
        m_pModel->m_pCurrentMesh->m_uiMaterialIndex = getMaterialIndex( strName );
    }

    // Skip rest of line
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//    Get a comment, values will be skipped
void ObjFileParser::getComment()
{
    bool running = true;
    while (running)
    {
        if ( '\n' == (*m_DataIt) || m_DataIt == m_DataItEnd )
        {
            ++m_DataIt;
            break;
        }
        else
        {
            ++m_DataIt;
        }
    }
}

// -------------------------------------------------------------------
//    Get material library from file.
void ObjFileParser::getMaterialLib()
{
    // Translate tuple
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    if (m_DataIt ==  m_DataItEnd)
        return;

    char *pStart = &(*m_DataIt);
    while (!isNewLine(*m_DataIt))
        m_DataIt++;

    // Check for existence
    const std::string strMatName(pStart, &(*m_DataIt));
    IOStream *pFile = m_pIO->Open(strMatName);

    if (!pFile )
    {
        DefaultLogger::get()->error("OBJ: Unable to locate material file " + strMatName);
        m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
        return;
    }

    // Import material library data from file
    std::vector<char> buffer;
    BaseImporter::TextFileToBuffer(pFile,buffer);
    m_pIO->Close( pFile );

    // Importing the material library
    ObjFileMtlImporter mtlImporter( buffer, strMatName, m_pModel );
}

// -------------------------------------------------------------------
//    Set a new material definition as the current material.
void ObjFileParser::getNewMaterial()
{
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
    if ( m_DataIt == m_DataItEnd )
        return;

    char *pStart = &(*m_DataIt);
    std::string strMat( pStart, *m_DataIt );
    while ( isSeparator( *m_DataIt ) )
        m_DataIt++;
    std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find( strMat );
    if ( it == m_pModel->m_MaterialMap.end() )
    {
        // Show a warning, if material was not found
        DefaultLogger::get()->warn("OBJ: Unsupported material requested: " + strMat);
        m_pModel->m_pCurrentMaterial = m_pModel->m_pDefaultMaterial;
    }
    else
    {
        // Set new material
        if ( needsNewMesh( strMat ) )
        {
            createMesh();
        }
        m_pModel->m_pCurrentMesh->m_uiMaterialIndex = getMaterialIndex( strMat );
    }

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
int ObjFileParser::getMaterialIndex( const std::string &strMaterialName )
{
    int mat_index = -1;
    if ( strMaterialName.empty() )
        return mat_index;
    for (size_t index = 0; index < m_pModel->m_MaterialLib.size(); ++index)
    {
        if ( strMaterialName == m_pModel->m_MaterialLib[ index ])
        {
            mat_index = (int)index;
            break;
        }
    }
    return mat_index;
}

// -------------------------------------------------------------------
//    Getter for a group name.
void ObjFileParser::getGroupName()
{
    // Get next word from data buffer
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
    if ( isEndOfBuffer( m_DataIt, m_DataItEnd ) )
        return;

    // Store groupname in group library
    char *pStart = &(*m_DataIt);
    while ( !isSeparator(*m_DataIt) )
        m_DataIt++;
    std::string strGroupName(pStart, &(*m_DataIt));

    // Change active group, if necessary
    if ( m_pModel->m_strActiveGroup != strGroupName )
    {
        // Search for already existing entry
        ObjFile::Model::ConstGroupMapIt it = m_pModel->m_Groups.find(&strGroupName);

        // We are mapping groups into the object structure
        createObject( strGroupName );

        // New group name, creating a new entry
        if (it == m_pModel->m_Groups.end())
        {
            std::vector<unsigned int> *pFaceIDArray = new std::vector<unsigned int>;
            m_pModel->m_Groups[ &strGroupName ] = pFaceIDArray;
            m_pModel->m_pGroupFaceIDs = (pFaceIDArray);
        }
        else
        {
            m_pModel->m_pGroupFaceIDs = (*it).second;
        }
        m_pModel->m_strActiveGroup = strGroupName;
    }
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//    Not supported
void ObjFileParser::getGroupNumber()
{
    // Not used

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//    Stores values for a new object instance, name will be used to
//    identify it.
void ObjFileParser::getObjectName()
{
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    if (m_DataIt == m_DataItEnd)
        return;
    char *pStart = &(*m_DataIt);
    while ( !isSeparator( *m_DataIt ) )
        ++m_DataIt;

    std::string strObjectName(pStart, &(*m_DataIt));
    if (!strObjectName.empty())
    {
        // Reset current object
        m_pModel->m_pCurrent = NULL;

        // Search for actual object
        for (std::vector<ObjFile::Object*>::const_iterator it = m_pModel->m_Objects.begin();
            it != m_pModel->m_Objects.end();
            ++it)
        {
            if ((*it)->m_strObjName == strObjectName)
            {
                m_pModel->m_pCurrent = *it;
                break;
            }
        }

        // Allocate a new object, if current one was not found before
        if ( NULL == m_pModel->m_pCurrent )
            createObject(strObjectName);
    }
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}
// -------------------------------------------------------------------
//    Creates a new object instance
void ObjFileParser::createObject(const std::string &strObjectName)
{
    ai_assert( NULL != m_pModel );
    //ai_assert( !strObjectName.empty() );

    m_pModel->m_pCurrent = new ObjFile::Object;
    m_pModel->m_pCurrent->m_strObjName = strObjectName;
    m_pModel->m_Objects.push_back( m_pModel->m_pCurrent );


    createMesh();

    if ( m_pModel->m_pCurrentMaterial )
    {
        m_pModel->m_pCurrentMesh->m_uiMaterialIndex =
            getMaterialIndex( m_pModel->m_pCurrentMaterial->MaterialName.data );
        m_pModel->m_pCurrentMesh->m_pMaterial = m_pModel->m_pCurrentMaterial;
    }
}
// -------------------------------------------------------------------
//    Creates a new mesh
void ObjFileParser::createMesh()
{
    ai_assert( NULL != m_pModel );
    m_pModel->m_pCurrentMesh = new ObjFile::Mesh;
    m_pModel->m_Meshes.push_back( m_pModel->m_pCurrentMesh );
    unsigned int meshId = m_pModel->m_Meshes.size()-1;
    if ( NULL != m_pModel->m_pCurrent )
    {
        m_pModel->m_pCurrent->m_Meshes.push_back( meshId );
    }
    else
    {
        DefaultLogger::get()->error("OBJ: No object detected to attach a new mesh instance.");
    }
}

// -------------------------------------------------------------------
//    Returns true, if a new mesh must be created.
bool ObjFileParser::needsNewMesh( const std::string &rMaterialName )
{
    if (m_pModel->m_pCurrentMesh == 0)
    {
        // No mesh data yet
        return true;
    }
    bool newMat = false;
    int matIdx = getMaterialIndex( rMaterialName );
    unsigned int curMatIdx = m_pModel->m_pCurrentMesh->m_uiMaterialIndex;
    if ( curMatIdx != ObjFile::Mesh::NoMaterial || curMatIdx != (unsigned int)matIdx )
    {
        // New material -> only one material per mesh, so we need to create a new
        // material
        newMat = true;
    }
    return newMat;
}

// -------------------------------------------------------------------
//    Shows an error in parsing process.
void ObjFileParser::reportErrorTokenInFace()
{
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
    DefaultLogger::get()->error("OBJ: Not supported token in face description detected");
}

// -------------------------------------------------------------------

}    // Namespace Assimp

#endif // !! ASSIMP_BUILD_NO_OBJ_IMPORTER
