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

Copyright (c) 2006-2016, assimp 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 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
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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*/

#include "D3MFImporter.h"

#include <assimp/scene.h>
#include <assimp/IOStream.hpp>
#include <assimp/IOSystem.hpp>
#include <assimp/DefaultLogger.hpp>
#include <contrib/unzip/unzip.h>
#include "irrXMLWrapper.h"
#include "StringComparison.h"


#include <string>
#include <sstream>
#include <vector>
#include <map>
#include <algorithm>
#include <cassert>
#include <cstdlib>
#include <memory>

#include <assimp/ai_assert.h>

#include "D3MFOpcPackage.h"

#ifndef ASSIMP_BUILD_NO_3MF_IMPORTER

namespace Assimp {

namespace D3MF {


namespace XmlTag {

    const std::string model     = "model";
    const std::string metadata  = "metadata";
    const std::string resources = "resources";
    const std::string object    = "object";
    const std::string mesh      = "mesh";
    const std::string vertices  = "vertices";
    const std::string vertex    = "vertex";
    const std::string triangles = "triangles";
    const std::string triangle  = "triangle";
    const std::string x         = "x";
    const std::string y         = "y";
    const std::string z         = "z";
    const std::string v1        = "v1";
    const std::string v2        = "v2";
    const std::string v3        = "v3";
    const std::string id        = "id";
    const std::string name      = "name";
    const std::string type      = "type";
    const std::string build     = "build";
    const std::string item      = "item";
    const std::string objectid  = "objectid";
    const std::string transform = "transform";

}


class XmlSerializer
{
public:
    XmlSerializer(XmlReader* xmlReader)
        : xmlReader(xmlReader)
    {

    }

    void ImportXml(aiScene* scene)
    {

        scene->mFlags |= AI_SCENE_FLAGS_NON_VERBOSE_FORMAT;

        scene->mRootNode = new aiNode();
        std::vector<aiNode*> children;

        while(ReadToEndElement(D3MF::XmlTag::model))
        {         

            if(xmlReader->getNodeName() == D3MF::XmlTag::object)
            {
                children.push_back(ReadObject(scene));
            }
            else if(xmlReader->getNodeName() == D3MF::XmlTag::build)
            {

            }
        }        

        if(scene->mRootNode->mName.length == 0)
            scene->mRootNode->mName.Set("3MF");


        scene->mNumMeshes = static_cast<unsigned int>(meshes.size());
        scene->mMeshes = new aiMesh*[scene->mNumMeshes]();

        std::copy(meshes.begin(), meshes.end(), scene->mMeshes);

        scene->mRootNode->mNumChildren = static_cast<unsigned int>(children.size());
        scene->mRootNode->mChildren = new aiNode*[scene->mRootNode->mNumChildren]();

        std::copy(children.begin(), children.end(), scene->mRootNode->mChildren);

    }

private:
    aiNode* ReadObject(aiScene* scene)
    {        
        ScopeGuard<aiNode> node(new aiNode());

        std::vector<unsigned long> meshIds;

        int id = std::atoi(xmlReader->getAttributeValue(D3MF::XmlTag::id.c_str()));
        std::string name(xmlReader->getAttributeValue(D3MF::XmlTag::name.c_str()));
        std::string type(xmlReader->getAttributeValue(D3MF::XmlTag::type.c_str()));

        node->mParent = scene->mRootNode;
        node->mName.Set(name);        

        unsigned long meshIdx = meshes.size();

        while(ReadToEndElement(D3MF::XmlTag::object))
        {
            if(xmlReader->getNodeName() == D3MF::XmlTag::mesh)
            {                
                auto mesh = ReadMesh();

                mesh->mName.Set(name);
                meshes.push_back(mesh);
                meshIds.push_back(meshIdx);
                meshIdx++;

            }
        }

        node->mNumMeshes = static_cast<unsigned int>(meshIds.size());

        node->mMeshes = new unsigned int[node->mNumMeshes];

        std::copy(meshIds.begin(), meshIds.end(), node->mMeshes);

        return node.dismiss();

    }

    aiMesh* ReadMesh()
    {
        aiMesh* mesh = new aiMesh();

        while(ReadToEndElement(D3MF::XmlTag::mesh))
        {            
            if(xmlReader->getNodeName() == D3MF::XmlTag::vertices)
            {
                ImportVertices(mesh);
            }
            else if(xmlReader->getNodeName() == D3MF::XmlTag::triangles)
            {
                ImportTriangles(mesh);
            }

        }


        return mesh;
    }

    void ImportVertices(aiMesh* mesh)
    {
        std::vector<aiVector3D> vertices;        

        while(ReadToEndElement(D3MF::XmlTag::vertices))
        {                        
            if(xmlReader->getNodeName() == D3MF::XmlTag::vertex)
            {                
                vertices.push_back(ReadVertex());
            }
        }
        mesh->mNumVertices = static_cast<unsigned int>(vertices.size());
        mesh->mVertices = new aiVector3D[mesh->mNumVertices];

        std::copy(vertices.begin(), vertices.end(), mesh->mVertices);

    }
    aiVector3D ReadVertex()
    {        
        aiVector3D vertex;
        vertex.x = std::strtof(xmlReader->getAttributeValue(D3MF::XmlTag::x.c_str()), nullptr);
        vertex.y = std::strtof(xmlReader->getAttributeValue(D3MF::XmlTag::y.c_str()), nullptr);
        vertex.z = std::strtof(xmlReader->getAttributeValue(D3MF::XmlTag::z.c_str()), nullptr);        

        return vertex;
    }

    void ImportTriangles(aiMesh* mesh)
    {
         std::vector<aiFace> faces;         


         while(ReadToEndElement(D3MF::XmlTag::triangles))
         {
             if(xmlReader->getNodeName() == D3MF::XmlTag::triangle)
             {
                 faces.push_back(ReadTriangle());
             }
         }

        mesh->mNumFaces = static_cast<unsigned int>(faces.size());
        mesh->mFaces = new aiFace[mesh->mNumFaces];
        mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;


        std::copy(faces.begin(), faces.end(), mesh->mFaces);

    }

    aiFace ReadTriangle()
    {
        aiFace face;

        face.mNumIndices = 3;
        face.mIndices = new unsigned int[face.mNumIndices];
        face.mIndices[0] = static_cast<unsigned int>(std::atoi(xmlReader->getAttributeValue(D3MF::XmlTag::v1.c_str())));
        face.mIndices[1] = static_cast<unsigned int>(std::atoi(xmlReader->getAttributeValue(D3MF::XmlTag::v2.c_str())));
        face.mIndices[2] = static_cast<unsigned int>(std::atoi(xmlReader->getAttributeValue(D3MF::XmlTag::v3.c_str())));

        return face;
    }

private:

    bool ReadToStartElement(const std::string& startTag)
    {
        while(xmlReader->read())
        {
            if (xmlReader->getNodeType() == irr::io::EXN_ELEMENT && xmlReader->getNodeName() == startTag)
            {
                return true;
            }
            else if (xmlReader->getNodeType() == irr::io::EXN_ELEMENT_END &&
                     xmlReader->getNodeName() == startTag)
            {
                return false;
            }
        }
        //DefaultLogger::get()->error("unexpected EOF, expected closing <" + closeTag + "> tag");
        return false;
    }

    bool ReadToEndElement(const std::string& closeTag)
    {
        while(xmlReader->read())
        {
            if (xmlReader->getNodeType() == irr::io::EXN_ELEMENT) {
                return true;
            }
            else if (xmlReader->getNodeType() == irr::io::EXN_ELEMENT_END
                     && xmlReader->getNodeName() == closeTag)
            {
                return false;
            }
        }
        DefaultLogger::get()->error("unexpected EOF, expected closing <" + closeTag + "> tag");
        return false;
    }


private:
    std::vector<aiMesh*> meshes;
    XmlReader* xmlReader;


};

} //namespace D3MF


static const aiImporterDesc desc = {
    "3mf Importer",
    "",
    "",
    "http://3mf.io/",
    aiImporterFlags_SupportBinaryFlavour | aiImporterFlags_SupportCompressedFlavour,
    0,
    0,
    0,
    0,
    "3mf"
};


D3MFImporter::D3MFImporter()
{

}

D3MFImporter::~D3MFImporter()
{

}

bool D3MFImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const
{    
    const std::string extension = GetExtension(pFile);

    if(extension == "3mf")
    {
        return true;
    }
    else if(!extension.length() || checkSig)
    {
        if(!pIOHandler)
            return true;
    }

    return false;
}

void D3MFImporter::SetupProperties(const Importer *pImp)
{

}

const aiImporterDesc *D3MFImporter::GetInfo() const
{
    return &desc;
}

void D3MFImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler)
{


    D3MF::D3MFOpcPackage opcPackage(pIOHandler, pFile);

    std::unique_ptr<CIrrXML_IOStreamReader> xmlStream(new CIrrXML_IOStreamReader(opcPackage.RootStream()));
    std::unique_ptr<D3MF::XmlReader> xmlReader(irr::io::createIrrXMLReader(xmlStream.get()));

    D3MF::XmlSerializer xmlSerializer(xmlReader.get());


    xmlSerializer.ImportXml(pScene);


}

}

#endif // ASSIMP_BUILD_NO_3MF_IMPORTER