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/// \file AMFImporter_Geometry.cpp
/// \brief Parsing data from geometry nodes.
/// \date 2016
/// \author smal.root@gmail.com

#ifndef ASSIMP_BUILD_NO_AMF_IMPORTER

#include "AMFImporter.hpp"
#include "AMFImporter_Macro.hpp"

#include <assimp/ParsingUtils.h>

namespace Assimp {

// <mesh>
// </mesh>
// A 3D mesh hull.
// Multi elements - Yes.
// Parent element - <object>.
void AMFImporter::ParseNode_Mesh(XmlNode &node) {
    AMFNodeElementBase *ne = nullptr;

    // create new mesh object.
    ne = new AMFMesh(mNodeElement_Cur);
    // Check for child nodes
    if (0 != ASSIMP_stricmp(node.name(), "mesh")) {
        return;
    }

    bool found_verts = false, found_volumes = false;
    pugi::xml_node vertNode = node.child("vertices");
    if (!vertNode.empty()) {
        ParseNode_Vertices(vertNode);
        found_verts = true;
    }

    pugi::xml_node volumeNode = node.child("volume");
    if (!volumeNode.empty()) {
        ParseNode_Volume(volumeNode);
        found_volumes = true;
    }

    if (!found_verts && !found_volumes) {
        mNodeElement_Cur->Child.push_back(ne);
    } // if(!mReader->isEmptyElement()) else

    // and to node element list because its a new object in graph.
    mNodeElement_List.push_back(ne);
}

// <vertices>
// </vertices>
// The list of vertices to be used in defining triangles.
// Multi elements - No.
// Parent element - <mesh>.
void AMFImporter::ParseNode_Vertices(XmlNode &node) {
    AMFNodeElementBase *ne = nullptr;

    // create new mesh object.
    ne = new AMFVertices(mNodeElement_Cur);
    // Check for child nodes
    pugi::xml_node vertexNode = node.child("vertex");
    if (!vertexNode.empty()) {
        ParseNode_Vertex(vertexNode);
    } else {
        mNodeElement_Cur->Child.push_back(ne); // Add element to child list of current element
    } // if(!mReader->isEmptyElement()) else

    mNodeElement_List.push_back(ne); // and to node element list because its a new object in graph.
}

// <vertex>
// </vertex>
// A vertex to be referenced in triangles.
// Multi elements - Yes.
// Parent element - <vertices>.
void AMFImporter::ParseNode_Vertex(XmlNode &node) {
    AMFNodeElementBase *ne = nullptr;

    // create new mesh object.
    ne = new AMFVertex(mNodeElement_Cur);

    // Check for child nodes
    pugi::xml_node colorNode = node.child("color");
    bool col_read = false;
    bool coord_read = false;
    if (!colorNode.empty()) {
        ParseNode_Color(colorNode);
        col_read = true;
    }
    pugi::xml_node coordNode = node.child("coordinates");
    if (!coordNode.empty()) {
        ParseNode_Coordinates(coordNode);
        coord_read = true;
    }
    if (!coord_read && !coord_read) {
        mNodeElement_Cur->Child.push_back(ne); // Add element to child list of current element
    }

    mNodeElement_List.push_back(ne); // and to node element list because its a new object in graph.
}

// <coordinates>
// </coordinates>
// Specifies the 3D location of this vertex.
// Multi elements - No.
// Parent element - <vertex>.
//
// Children elements:
//   <x>, <y>, <z>
//   Multi elements - No.
//   X, Y, or Z coordinate, respectively, of a vertex position in space.
void AMFImporter::ParseNode_Coordinates(XmlNode &node) {
    AMFNodeElementBase *ne = nullptr;

    // create new color object.
    ne = new AMFCoordinates(mNodeElement_Cur);

    AMFCoordinates &als = *((AMFCoordinates *)ne); // alias for convenience

    als.Coordinate.x = (ai_real)node.attribute("x").as_float();
    als.Coordinate.y = (ai_real)node.attribute("y").as_float();
    als.Coordinate.z = (ai_real)node.attribute("z").as_float();
    mNodeElement_Cur->Child.push_back(ne);

    mNodeElement_List.push_back(ne); // and to node element list because its a new object in graph.
}

// <volume
// materialid="" - Which material to use.
// type=""       - What this volume describes can be “region” or “support”. If none specified, “object” is assumed. If support, then the geometric
//                 requirements 1-8 listed in section 5 do not need to be maintained.
// >
// </volume>
// Defines a volume from the established vertex list.
// Multi elements - Yes.
// Parent element - <mesh>.
void AMFImporter::ParseNode_Volume(XmlNode &node) {
    std::string materialid;
    std::string type;
    AMFNodeElementBase *ne = new AMFVolume(mNodeElement_Cur);

    // Read attributes for node <color>.
    // and assign read data
   
    ((AMFVolume *)ne)->MaterialID = node.attribute("materialid").as_string();
     
    ((AMFVolume *)ne)->Type = type;
    // Check for child nodes
    if (node.empty()) {
        mNodeElement_Cur->Child.push_back(ne); // Add element to child list of current element
    }

    bool col_read = false;
    for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {
        const std::string currentName = currentNode.name();
        if (currentName == "color") {
            if (col_read) Throw_MoreThanOnceDefined(currentName ,"color", "Only one color can be defined for <volume>.");
            ParseNode_Color(currentNode);
            col_read = true;
        } else if (currentName == "triangle") {
            ParseNode_Triangle(currentNode);
        } else if (currentName == "metadata") {
            ParseNode_Metadata(currentNode);
        } else if (currentName == "volume") {
            ParseNode_Metadata(currentNode);
        }
    }

    mNodeElement_List.push_back(ne); // and to node element list because its a new object in graph.
}

// <triangle>
// </triangle>
// Defines a 3D triangle from three vertices, according to the right-hand rule (counter-clockwise when looking from the outside).
// Multi elements - Yes.
// Parent element - <volume>.
//
// Children elements:
//   <v1>, <v2>, <v3>
//   Multi elements - No.
//   Index of the desired vertices in a triangle or edge.
void AMFImporter::ParseNode_Triangle(XmlNode &node) {
    AMFNodeElementBase *ne = new AMFTriangle(mNodeElement_Cur);

    // create new triangle object.

    AMFTriangle &als = *((AMFTriangle *)ne); // alias for convenience

    if (node.empty()) {
        mNodeElement_Cur->Child.push_back(ne); // Add element to child list of current element
    }

    // Check for child nodes
    bool col_read = false, tex_read = false;
    bool read_flag[3] = { false, false, false };
    for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {
        const std::string currentName = currentNode.name();
        if (currentName == "color") {
            if (col_read) Throw_MoreThanOnceDefined(currentName , "color", "Only one color can be defined for <triangle>.");
            ParseNode_Color(currentNode);
            col_read = true;
        } else if (currentName == "texmap") {
            ParseNode_TexMap(currentNode);
            tex_read = true;
        } else if (currentName == "map") {
            ParseNode_TexMap(currentNode, true);
            tex_read = true;
        } else if (currentName == "v1") {
            als.V[0] = std::atoi(currentNode.value());
            read_flag[0] = true;
        } else if (currentName == "v2") {
            als.V[1] = std::atoi(currentNode.value());
            read_flag[1] = true;
        } else if (currentName == "v3") {
            als.V[2] = std::atoi(currentNode.value());
            read_flag[2] = true;
        }
    }
    if ((read_flag[0] && read_flag[1] && read_flag[2]) == 0) {
        throw DeadlyImportError("Not all vertices of the triangle are defined.");
    }


    mNodeElement_List.push_back(ne); // and to node element list because its a new object in graph.
}

} // namespace Assimp

#endif // !ASSIMP_BUILD_NO_AMF_IMPORTER