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

#ifndef ASSIMP_BUILD_NO_AMF_IMPORTER

#include "AMFImporter.hpp"

namespace Assimp {

// <color
// profile="" - The ICC color space used to interpret the three color channels <r>, <g> and <b>.
// >
// </color>
// A color definition.
// Multi elements - No.
// Parent element - <material>, <object>, <volume>, <vertex>, <triangle>.
//
// "profile" can be one of "sRGB", "AdobeRGB", "Wide-Gamut-RGB", "CIERGB", "CIELAB", or "CIEXYZ".
// Children elements:
//   <r>, <g>, <b>, <a>
//   Multi elements - No.
//   Red, Greed, Blue and Alpha (transparency) component of a color in sRGB space, values ranging from 0 to 1. The
//   values can be specified as constants, or as a formula depending on the coordinates.
void AMFImporter::ParseNode_Color(XmlNode &node) {
    std::string profile = node.attribute("profile").as_string();
    
	// create new color object.
	AMFNodeElementBase *ne = new AMFColor(mNodeElement_Cur);
	AMFColor& als = *((AMFColor*)ne);// alias for convenience

	als.Profile = profile;
	if (!node.empty()) {
        ParseHelper_Node_Enter(ne);
		bool read_flag[4] = { false, false, false, false };
		for (pugi::xml_node &child : node.children()) {
            std::string name = child.name();
            if ( name == "r") {
				read_flag[0] = true;
                XmlParser::getValueAsFloat(child, als.Color.r);
            } else if (name == "g") {
				read_flag[1] = true;
                XmlParser::getValueAsFloat(child, als.Color.g);
            } else if (name == "b") {
				read_flag[2] = true;
                XmlParser::getValueAsFloat(child, als.Color.b);
            } else if (name == "a") {
			    read_flag[3] = true;
                XmlParser::getValueAsFloat(child, als.Color.a);
            }
            ParseHelper_Node_Exit();
        }
		// check that all components was defined
		if (!(read_flag[0] && read_flag[1] && read_flag[2])) {
			throw DeadlyImportError("Not all color components are defined.");
		}

		// check if <a> is absent. Then manually add "a == 1".
		if (!read_flag[3]) {
			als.Color.a = 1;
		}
	} else {
		mNodeElement_Cur->Child.push_back(ne);// Add element to child list of current element
	}

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

// <material
// id="" - A unique material id. material ID "0" is reserved to denote no material (void) or sacrificial material.
// >
// </material>
// An available material.
// Multi elements - Yes.
// Parent element - <amf>.
void AMFImporter::ParseNode_Material(XmlNode &node) {
    // create new object and assign read data
	std::string id = node.attribute("id").as_string();
	AMFNodeElementBase *ne = new AMFMaterial(mNodeElement_Cur);
	((AMFMaterial*)ne)->ID = id;

    // Check for child nodes
	if (!node.empty()) {
        ParseHelper_Node_Enter(ne);
        for (pugi::xml_node &child : node.children()) {
            const std::string name = child.name();
            if (name == "color") {
				ParseNode_Color(child);
            } else if (name == "metadata") {
				ParseNode_Metadata(child);
			}
		}
        ParseHelper_Node_Exit();
	} else {
		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.
}

// <texture
// id=""     - Assigns a unique texture id for the new texture.
// width=""  - Width (horizontal size, x) of the texture, in pixels.
// height="" - Height (lateral size, y) of the texture, in pixels.
// depth=""  - Depth (vertical size, z) of the texture, in pixels.
// type=""   - Encoding of the data in the texture. Currently allowed values are "grayscale" only. In grayscale mode, each pixel is represented by one byte
//   in the range of 0-255. When the texture is referenced using the tex function, these values are converted into a single floating point number in the
//   range of 0-1 (see Annex 2). A full color graphics will typically require three textures, one for each of the color channels. A graphic involving
//   transparency may require a fourth channel.
// tiled=""  - If true then texture repeated when UV-coordinates is greater than 1.
// >
// </triangle>
// Specifies an texture data to be used as a map. Lists a sequence of Base64 values specifying values for pixels from left to right then top to bottom,
// then layer by layer.
// Multi elements - Yes.
// Parent element - <amf>.
void AMFImporter::ParseNode_Texture(XmlNode &node) {
    std::string id = node.attribute("id").as_string();
	uint32_t width = node.attribute("width").as_uint();
	uint32_t height = node.attribute("height").as_uint();
	uint32_t depth = node.attribute("depth").as_uint();
	std::string type = node.attribute("type").as_string();
	bool tiled = node.attribute("tiled").as_bool();

	// create new texture object.
    AMFNodeElementBase *ne = new AMFTexture(mNodeElement_Cur);

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

    if (node.empty()) {
		return;
    }

    std::string enc64_data = node.value();
	// Check for child nodes

	// check that all components was defined
    if (id.empty()) {
		throw DeadlyImportError("ID for texture must be defined.");
    }
    if (width < 1) {
		throw DeadlyImportError("INvalid width for texture.");
    }
    if (height < 1) {
		throw DeadlyImportError("Invalid height for texture.");
	}
    if (depth < 1) {
		throw DeadlyImportError("Invalid depth for texture.");
    }
    if (type != "grayscale") {
		throw DeadlyImportError("Invalid type for texture.");
    }
    if (enc64_data.empty()) {
        throw DeadlyImportError("Texture data not defined.");
    }
	// copy data
	als.ID = id;
	als.Width = width;
	als.Height = height;
	als.Depth = depth;
	als.Tiled = tiled;
	ParseHelper_Decode_Base64(enc64_data, als.Data);

    // check data size
    if ((width * height * depth) != als.Data.size()) {
        throw DeadlyImportError("Texture has incorrect data size.");
    }

	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.
}

// <texmap
// rtexid="" - Texture ID for red color component.
// gtexid="" - Texture ID for green color component.
// btexid="" - Texture ID for blue color component.
// atexid="" - Texture ID for alpha color component. Optional.
// >
// </texmap>, old name: <map>
// Specifies texture coordinates for triangle.
// Multi elements - No.
// Parent element - <triangle>.
// Children elements:
//   <utex1>, <utex2>, <utex3>, <vtex1>, <vtex2>, <vtex3>. Old name: <u1>, <u2>, <u3>, <v1>, <v2>, <v3>.
//   Multi elements - No.
//   Texture coordinates for every vertex of triangle.
void AMFImporter::ParseNode_TexMap(XmlNode &node, const bool pUseOldName) {
	// Read attributes for node <color>.
    AMFNodeElementBase *ne = new AMFTexMap(mNodeElement_Cur);
    AMFTexMap &als = *((AMFTexMap *)ne); //
    std::string rtexid, gtexid, btexid, atexid;
    if (!node.empty()) {
        ParseHelper_Node_Enter(ne);
        for (XmlNode &currentNode : node.children()) {
            const std::string &currentName = currentNode.name();
            if (currentName == "rtexid") {
                XmlParser::getValueAsString(node, rtexid);
            } else if (currentName == "gtexid") {
                XmlParser::getValueAsString(node, gtexid);
            } else if (currentName == "btexid") {
                XmlParser::getValueAsString(node, btexid);
            } else if (currentName == "atexid") {
                XmlParser::getValueAsString(node, atexid);
            }
        }
        ParseHelper_Node_Exit();
    }

	// create new texture coordinates object, alias for convenience
	// check data
	if (rtexid.empty() && gtexid.empty() && btexid.empty()) {
		throw DeadlyImportError("ParseNode_TexMap. At least one texture ID must be defined.");
	}

	// Check for children nodes
	//XML_CheckNode_MustHaveChildren();
	if (node.children().begin() == node.children().end()) {
		throw DeadlyImportError("Invalid children definition.");
	}
	// read children nodes
	bool read_flag[6] = { false, false, false, false, false, false };

	if (!pUseOldName) {
		for (pugi::xml_attribute &attr : node.attributes()) {
            const std::string name = attr.name();
            if (name == "utex1") {
				read_flag[0] = true;
				als.TextureCoordinate[0].x = attr.as_float();
            } else if (name == "utex2") {
				read_flag[1] = true;
				als.TextureCoordinate[1].x = attr.as_float();
            } else if (name == "utex3") {
				read_flag[2] = true;
				als.TextureCoordinate[2].x = attr.as_float();
            } else if (name == "vtex1") {
				read_flag[3] = true;
				als.TextureCoordinate[0].y = attr.as_float();
            } else if (name == "vtex2") {
				read_flag[4] = true;
				als.TextureCoordinate[1].y = attr.as_float();
            } else if (name == "vtex3") {
				read_flag[5] = true;
				als.TextureCoordinate[0].y = attr.as_float();
			}
		}
	} else {
		for (pugi::xml_attribute &attr : node.attributes()) {
            const std::string name = attr.name();
            if (name == "u") {
				read_flag[0] = true;
				als.TextureCoordinate[0].x = attr.as_float();
            } else if (name == "u2") {
				read_flag[1] = true;
				als.TextureCoordinate[1].x = attr.as_float();
            } else if (name == "u3") {
				read_flag[2] = true;
				als.TextureCoordinate[2].x = attr.as_float();
            } else if (name == "v1") {
				read_flag[3] = true;
				als.TextureCoordinate[0].y = attr.as_float();
            } else if (name == "v2") {
				read_flag[4] = true;
				als.TextureCoordinate[1].y = attr.as_float();
            } else if (name == "v3") {
				read_flag[5] = true;
				als.TextureCoordinate[0].y = attr.as_float();
			}
		}
	}

	// check that all components was defined
	if (!(read_flag[0] && read_flag[1] && read_flag[2] && read_flag[3] && read_flag[4] && read_flag[5])) {
		throw DeadlyImportError("Not all texture coordinates are defined.");
	}

	// copy attributes data
	als.TextureID_R = rtexid;
	als.TextureID_G = gtexid;
	als.TextureID_B = btexid;
	als.TextureID_A = atexid;

	mNodeElement_List.push_back(ne);
}

}// namespace Assimp

#endif // !ASSIMP_BUILD_NO_AMF_IMPORTER
