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/// \file   X3DImporter.cpp
/// \brief  X3D-format files importer for Assimp: main algorithm implementation.
/// \date   2015-2016
/// \author smal.root@gmail.com

#ifndef ASSIMP_BUILD_NO_X3D_IMPORTER

#include "X3DImporter.hpp"
#include "X3DImporter_Macro.hpp"

#include <assimp/DefaultIOSystem.h>

// Header files, stdlib.
#include <iterator>
#include <memory>

namespace Assimp {

/// Constant which holds the importer description
const aiImporterDesc X3DImporter::Description = {
    "Extensible 3D(X3D) Importer",
    "smalcom",
    "",
    "See documentation in source code. Chapter: Limitations.",
    aiImporterFlags_SupportTextFlavour | aiImporterFlags_SupportBinaryFlavour | aiImporterFlags_LimitedSupport | aiImporterFlags_Experimental,
    0,
    0,
    0,
    0,
    "x3d x3db"
};

bool X3DImporter::isNodeEmpty(XmlNode &node) {
    return node.first_child().empty();
}

void X3DImporter::checkNodeMustBeEmpty(XmlNode &node) {
    if (!isNodeEmpty(node)) throw DeadlyImportError(std::string("Node <") + node.name() + "> must be empty.");
}

void X3DImporter::skipUnsupportedNode(const std::string &pParentNodeName, XmlNode &node) {
    static const size_t Uns_Skip_Len = 192;
    static const char *Uns_Skip[Uns_Skip_Len] = {
        // CAD geometry component
        "CADAssembly", "CADFace", "CADLayer", "CADPart", "IndexedQuadSet", "QuadSet",
        // Core
        "ROUTE", "ExternProtoDeclare", "ProtoDeclare", "ProtoInstance", "ProtoInterface", "WorldInfo",
        // Distributed interactive simulation (DIS) component
        "DISEntityManager", "DISEntityTypeMapping", "EspduTransform", "ReceiverPdu", "SignalPdu", "TransmitterPdu",
        // Cube map environmental texturing component
        "ComposedCubeMapTexture", "GeneratedCubeMapTexture", "ImageCubeMapTexture",
        // Environmental effects component
        "Background", "Fog", "FogCoordinate", "LocalFog", "TextureBackground",
        // Environmental sensor component
        "ProximitySensor", "TransformSensor", "VisibilitySensor",
        // Followers component
        "ColorChaser", "ColorDamper", "CoordinateChaser", "CoordinateDamper", "OrientationChaser", "OrientationDamper", "PositionChaser", "PositionChaser2D",
        "PositionDamper", "PositionDamper2D", "ScalarChaser", "ScalarDamper", "TexCoordChaser2D", "TexCoordDamper2D",
        // Geospatial component
        "GeoCoordinate", "GeoElevationGrid", "GeoLocation", "GeoLOD", "GeoMetadata", "GeoOrigin", "GeoPositionInterpolator", "GeoProximitySensor",
        "GeoTouchSensor", "GeoTransform", "GeoViewpoint",
        // Humanoid Animation (H-Anim) component
        "HAnimDisplacer", "HAnimHumanoid", "HAnimJoint", "HAnimSegment", "HAnimSite",
        // Interpolation component
        "ColorInterpolator", "CoordinateInterpolator", "CoordinateInterpolator2D", "EaseInEaseOut", "NormalInterpolator", "OrientationInterpolator",
        "PositionInterpolator", "PositionInterpolator2D", "ScalarInterpolator", "SplinePositionInterpolator", "SplinePositionInterpolator2D",
        "SplineScalarInterpolator", "SquadOrientationInterpolator",
        // Key device sensor component
        "KeySensor", "StringSensor",
        // Layering component
        "Layer", "LayerSet", "Viewport",
        // Layout component
        "Layout", "LayoutGroup", "LayoutLayer", "ScreenFontStyle", "ScreenGroup",
        // Navigation component
        "Billboard", "Collision", "LOD", "NavigationInfo", "OrthoViewpoint", "Viewpoint", "ViewpointGroup",
        // Networking component
        "EXPORT", "IMPORT", "Anchor", "LoadSensor",
        // NURBS component
        "Contour2D", "ContourPolyline2D", "CoordinateDouble", "NurbsCurve", "NurbsCurve2D", "NurbsOrientationInterpolator", "NurbsPatchSurface",
        "NurbsPositionInterpolator", "NurbsSet", "NurbsSurfaceInterpolator", "NurbsSweptSurface", "NurbsSwungSurface", "NurbsTextureCoordinate",
        "NurbsTrimmedSurface",
        // Particle systems component
        "BoundedPhysicsModel", "ConeEmitter", "ExplosionEmitter", "ForcePhysicsModel", "ParticleSystem", "PointEmitter", "PolylineEmitter", "SurfaceEmitter",
        "VolumeEmitter", "WindPhysicsModel",
        // Picking component
        "LinePickSensor", "PickableGroup", "PointPickSensor", "PrimitivePickSensor", "VolumePickSensor",
        // Pointing device sensor component
        "CylinderSensor", "PlaneSensor", "SphereSensor", "TouchSensor",
        // Rendering component
        "ClipPlane",
        // Rigid body physics
        "BallJoint", "CollidableOffset", "CollidableShape", "CollisionCollection", "CollisionSensor", "CollisionSpace", "Contact", "DoubleAxisHingeJoint",
        "MotorJoint", "RigidBody", "RigidBodyCollection", "SingleAxisHingeJoint", "SliderJoint", "UniversalJoint",
        // Scripting component
        "Script",
        // Programmable shaders component
        "ComposedShader", "FloatVertexAttribute", "Matrix3VertexAttribute", "Matrix4VertexAttribute", "PackagedShader", "ProgramShader", "ShaderPart",
        "ShaderProgram",
        // Shape component
        "FillProperties", "LineProperties", "TwoSidedMaterial",
        // Sound component
        "AudioClip", "Sound",
        // Text component
        "FontStyle", "Text",
        // Texturing3D Component
        "ComposedTexture3D", "ImageTexture3D", "PixelTexture3D", "TextureCoordinate3D", "TextureCoordinate4D", "TextureTransformMatrix3D", "TextureTransform3D",
        // Texturing component
        "MovieTexture", "MultiTexture", "MultiTextureCoordinate", "MultiTextureTransform", "PixelTexture", "TextureCoordinateGenerator", "TextureProperties",
        // Time component
        "TimeSensor",
        // Event Utilities component
        "BooleanFilter", "BooleanSequencer", "BooleanToggle", "BooleanTrigger", "IntegerSequencer", "IntegerTrigger", "TimeTrigger",
        // Volume rendering component
        "BlendedVolumeStyle", "BoundaryEnhancementVolumeStyle", "CartoonVolumeStyle", "ComposedVolumeStyle", "EdgeEnhancementVolumeStyle", "IsoSurfaceVolumeData",
        "OpacityMapVolumeStyle", "ProjectionVolumeStyle", "SegmentedVolumeData", "ShadedVolumeStyle", "SilhouetteEnhancementVolumeStyle", "ToneMappedVolumeStyle",
        "VolumeData"
    };

    const std::string nn = node.name();

    if (nn.empty()) {
        const std::string nv = node.value();
        if (!nv.empty()) {
            LogInfo("Ignoring comment \"" + nv + "\" in " + pParentNodeName + ".");
            return;
        }
    }

    bool found = false;

    for (size_t i = 0; i < Uns_Skip_Len; i++) {
        if (nn == Uns_Skip[i]) {
            found = true;
        }
    }

    if (!found) throw DeadlyImportError("Unknown node \"" + nn + "\" in " + pParentNodeName + ".");

    LogInfo("Skipping node \"" + nn + "\" in " + pParentNodeName + ".");
}

X3DImporter::X3DImporter() :
        mNodeElementCur(nullptr),
        mScene(nullptr),
        mpIOHandler(nullptr) {
    // empty
}

X3DImporter::~X3DImporter() {
    // Clear() is accounting if data already is deleted. So, just check again if all data is deleted.
    Clear();
}

void X3DImporter::Clear() {
    mNodeElementCur = nullptr;
    // Delete all elements
    if (!NodeElement_List.empty()) {
        for (std::list<X3DNodeElementBase *>::iterator it = NodeElement_List.begin(); it != NodeElement_List.end(); ++it) {
            delete *it;
        }
        NodeElement_List.clear();
    }
}

void X3DImporter::ParseFile(const std::string &file, IOSystem *pIOHandler) {
    ai_assert(nullptr != pIOHandler);

    static const std::string mode = "rb";
    std::unique_ptr<IOStream> fileStream(pIOHandler->Open(file, mode));
    if (!fileStream.get()) {
        throw DeadlyImportError("Failed to open file " + file + ".");
    }

    XmlParser theParser;
    if (!theParser.parse(fileStream.get())) {
        return;
    }

    XmlNode *node = theParser.findNode("X3D");
    if (nullptr == node) {
        return;
    }

    for (auto &currentNode : node->children()) {
        const std::string &currentName = currentNode.name();
        if (currentName == "head") {
            readHead(currentNode);
        } else if (currentName == "Scene") {
            readScene(currentNode);
        } else {
            skipUnsupportedNode("X3D", currentNode);
        }
    }
}

bool X3DImporter::CanRead(const std::string &pFile, IOSystem * /*pIOHandler*/, bool checkSig) const {
    if (checkSig) {
        if (GetExtension(pFile) == "x3d")
            return true;
    }

    return false;
}

void X3DImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
    mpIOHandler = pIOHandler;

    Clear();
    std::shared_ptr<IOStream> stream(pIOHandler->Open(pFile, "rb"));
    if (!stream) {
        throw DeadlyImportError("Could not open file for reading");
    }
    std::string::size_type slashPos = pFile.find_last_of("\\/");

    mScene = pScene;
    pScene->mRootNode = new aiNode(pFile);
    pScene->mRootNode->mParent = nullptr;
    pScene->mFlags |= AI_SCENE_FLAGS_ALLOW_SHARED;

    pIOHandler->PushDirectory(slashPos == std::string::npos ? std::string() : pFile.substr(0, slashPos + 1));
    ParseFile(pFile, pIOHandler);
    pIOHandler->PopDirectory();

    //search for root node element

    mNodeElementCur = NodeElement_List.front();
    while (mNodeElementCur->Parent != nullptr) {
        mNodeElementCur = mNodeElementCur->Parent;
    }

    { // fill aiScene with objects.
        std::list<aiMesh *> mesh_list;
        std::list<aiMaterial *> mat_list;
        std::list<aiLight *> light_list;

        // create nodes tree
        Postprocess_BuildNode(*mNodeElementCur, *pScene->mRootNode, mesh_list, mat_list, light_list);
        // copy needed data to scene
        if (!mesh_list.empty()) {
            std::list<aiMesh *>::const_iterator it = mesh_list.begin();

            pScene->mNumMeshes = static_cast<unsigned int>(mesh_list.size());
            pScene->mMeshes = new aiMesh *[pScene->mNumMeshes];
            for (size_t i = 0; i < pScene->mNumMeshes; i++)
                pScene->mMeshes[i] = *it++;
        }

        if (!mat_list.empty()) {
            std::list<aiMaterial *>::const_iterator it = mat_list.begin();

            pScene->mNumMaterials = static_cast<unsigned int>(mat_list.size());
            pScene->mMaterials = new aiMaterial *[pScene->mNumMaterials];
            for (size_t i = 0; i < pScene->mNumMaterials; i++)
                pScene->mMaterials[i] = *it++;
        }

        if (!light_list.empty()) {
            std::list<aiLight *>::const_iterator it = light_list.begin();

            pScene->mNumLights = static_cast<unsigned int>(light_list.size());
            pScene->mLights = new aiLight *[pScene->mNumLights];
            for (size_t i = 0; i < pScene->mNumLights; i++)
                pScene->mLights[i] = *it++;
        }
    }
}

const aiImporterDesc *X3DImporter::GetInfo() const {
    return &Description;
}

struct meta_entry {
    std::string name;
    std::string value;
};

void X3DImporter::readHead(XmlNode &node) {
    std::vector<meta_entry> metaArray;
    for (auto currentNode : node.children()) {
        const std::string &currentName = currentNode.name();
        if (currentName == "meta") {
            //checkNodeMustBeEmpty(node);
            meta_entry entry;
            if (XmlParser::getStdStrAttribute(currentNode, "name", entry.name)) {
                XmlParser::getStdStrAttribute(currentNode, "content", entry.value);
                metaArray.emplace_back(entry);
            }
        }
        // TODO: check if other node types in head should be supported
    }
    mScene->mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(metaArray.size()));
    unsigned int i = 0;
    for (auto currentMeta : metaArray) {
        mScene->mMetaData->Set(i, currentMeta.name, aiString(currentMeta.value));
        ++i;
    }
}

void X3DImporter::readChildNodes(XmlNode &node, const std::string &pParentNodeName) {
    if (node.empty()) {
        return;
    }
    for (auto currentNode : node.children()) {
        const std::string &currentName = currentNode.name();
        if (currentName == "Shape")
            readShape(currentNode);
        else if (currentName == "Group") {
            startReadGroup(currentNode);
            readChildNodes(currentNode, "Group");
            endReadGroup();
        } else if (currentName == "StaticGroup") {
            startReadStaticGroup(currentNode);
            readChildNodes(currentNode, "StaticGroup");
            endReadStaticGroup();
        } else if (currentName == "Transform") {
            startReadTransform(currentNode);
            readChildNodes(currentNode, "Transform");
            endReadTransform();
        } else if (currentName == "Switch") {
            startReadSwitch(currentNode);
            readChildNodes(currentNode, "Switch");
            endReadSwitch();
        } else if (currentName == "DirectionalLight") {
            readDirectionalLight(currentNode);
        } else if (currentName == "PointLight") {
            readPointLight(currentNode);
        } else if (currentName == "SpotLight") {
            readSpotLight(currentNode);
        } else if (currentName == "Inline") {
            readInline(currentNode);
        } else if (!checkForMetadataNode(currentNode)) {
            skipUnsupportedNode(pParentNodeName, currentNode);
        }
    }
}

void X3DImporter::readScene(XmlNode &node) {
    ParseHelper_Group_Begin(true);
    readChildNodes(node, "Scene");
    ParseHelper_Node_Exit();
}

/*********************************************************************************************************************************************/
/************************************************************ Functions: find set ************************************************************/
/*********************************************************************************************************************************************/

bool X3DImporter::FindNodeElement_FromRoot(const std::string &pID, const X3DElemType pType, X3DNodeElementBase **pElement) {
    for (std::list<X3DNodeElementBase *>::iterator it = NodeElement_List.begin(); it != NodeElement_List.end(); ++it) {
        if (((*it)->Type == pType) && ((*it)->ID == pID)) {
            if (pElement != nullptr) *pElement = *it;

            return true;
        }
    } // for(std::list<CX3DImporter_NodeElement*>::iterator it = NodeElement_List.begin(); it != NodeElement_List.end(); it++)

    return false;
}

bool X3DImporter::FindNodeElement_FromNode(X3DNodeElementBase *pStartNode, const std::string &pID,
        const X3DElemType pType, X3DNodeElementBase **pElement) {
    bool found = false; // flag: true - if requested element is found.

    // Check if pStartNode - this is the element, we are looking for.
    if ((pStartNode->Type == pType) && (pStartNode->ID == pID)) {
        found = true;
        if (pElement != nullptr) {
            *pElement = pStartNode;
        }

        goto fne_fn_end;
    } // if((pStartNode->Type() == pType) && (pStartNode->ID() == pID))

    // Check childs of pStartNode.
    for (std::list<X3DNodeElementBase *>::iterator ch_it = pStartNode->Children.begin(); ch_it != pStartNode->Children.end(); ++ch_it) {
        found = FindNodeElement_FromNode(*ch_it, pID, pType, pElement);
        if (found) {
            break;
        }
    } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = it->Children.begin(); ch_it != it->Children.end(); ch_it++)

fne_fn_end:

    return found;
}

bool X3DImporter::FindNodeElement(const std::string &pID, const X3DElemType pType, X3DNodeElementBase **pElement) {
    X3DNodeElementBase *tnd = mNodeElementCur; // temporary pointer to node.
    bool static_search = false; // flag: true if searching in static node.

    // At first check if we have deal with static node. Go up through parent nodes and check flag.
    while (tnd != nullptr) {
        if (tnd->Type == X3DElemType::ENET_Group) {
            if (((X3DNodeElementGroup *)tnd)->Static) {
                static_search = true; // Flag found, stop walking up. Node with static flag will holded in tnd variable.
                break;
            }
        }

        tnd = tnd->Parent; // go up in graph.
    } // while (tnd != nullptr)

    // at now call appropriate search function.
    if (static_search) {
        return FindNodeElement_FromNode(tnd, pID, pType, pElement);
    } else {
        return FindNodeElement_FromRoot(pID, pType, pElement);
    }
}

/*********************************************************************************************************************************************/
/************************************************************ Functions: parse set ***********************************************************/
/*********************************************************************************************************************************************/

void X3DImporter::ParseHelper_Group_Begin(const bool pStatic) {
    X3DNodeElementGroup *new_group = new X3DNodeElementGroup(mNodeElementCur, pStatic); // create new node with current node as parent.

    // if we are adding not the root element then add new element to current element child list.
    if (mNodeElementCur != nullptr) {
        mNodeElementCur->Children.push_back(new_group);
    }

    NodeElement_List.push_back(new_group); // it's a new element - add it to list.
    mNodeElementCur = new_group; // switch current element to new one.
}

void X3DImporter::ParseHelper_Node_Enter(X3DNodeElementBase *pNode) {
    ai_assert(nullptr != pNode);

    mNodeElementCur->Children.push_back(pNode); // add new element to current element child list.
    mNodeElementCur = pNode; // switch current element to new one.
}    

void X3DImporter::ParseHelper_Node_Exit() {
    // check if we can walk up.
    if (mNodeElementCur != nullptr) {
        mNodeElementCur = mNodeElementCur->Parent;
    } else {
        int i = 0;
        ++i;
    }
}

} // namespace Assimp

#endif // !ASSIMP_BUILD_NO_X3D_IMPORTER
