/*************************************************************************/
/*  FBXMaterial.cpp                                                      */
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/*
Open Asset Import Library (assimp)
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Copyright (c) 2006-2020, assimp team

All rights reserved.

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  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
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

/** @file  FBXMaterial.cpp
 *  @brief Assimp::FBX::Material and Assimp::FBX::Texture implementation
 */

#include "ByteSwapper.h"
#include "FBXDocument.h"
#include "FBXDocumentUtil.h"
#include "FBXImportSettings.h"
#include "FBXParser.h"
#include "FBXProperties.h"

#include "FBXUtil.h"
#include <algorithm> // std::transform

namespace FBXDocParser {

using namespace Util;

// ------------------------------------------------------------------------------------------------
Material::Material(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Object(id, element, name) {
	const ScopePtr sc = GetRequiredScope(element);

	const ElementPtr ShadingModel = sc->GetElement("ShadingModel");
	const ElementPtr MultiLayer = sc->GetElement("MultiLayer");

	if (MultiLayer) {
		multilayer = !!ParseTokenAsInt(GetRequiredToken(MultiLayer, 0));
	}

	if (ShadingModel) {
		shading = ParseTokenAsString(GetRequiredToken(ShadingModel, 0));
	} else {
		DOMWarning("shading mode not specified, assuming phong", element);
		shading = "phong";
	}

	std::string templateName;

	if (shading == "phong") {
		templateName = "Material.Phong";
	} else if (shading == "lambert") {
		templateName = "Material.Lambert";
	} else if (shading == "unknown") {
		templateName = "Material.StingRay";
	} else {
		DOMWarning("shading mode not recognized: " + shading, element);
	}

	// resolve texture links
	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID());
	for (const Connection *con : conns) {
		// texture link to properties, not objects
		if (!con->PropertyName().length()) {
			continue;
		}

		Object *ob = con->SourceObject();
		if (!ob) {
			DOMWarning("failed to read source object for texture link, ignoring", element);
			continue;
		}

		const Texture *tex = dynamic_cast<const Texture *>(ob);
		if (!tex) {
			LayeredTexture *layeredTexture = dynamic_cast<LayeredTexture *>(ob);

			if (!layeredTexture) {
				DOMWarning("source object for texture link is not a texture or layered texture, ignoring", element);
				continue;
			}

			const std::string &prop = con->PropertyName();
			if (layeredTextures.find(prop) != layeredTextures.end()) {
				DOMWarning("duplicate layered texture link: " + prop, element);
			}

			layeredTextures[prop] = layeredTexture;
			layeredTexture->fillTexture(doc);
		} else {
			const std::string &prop = con->PropertyName();
			if (textures.find(prop) != textures.end()) {
				DOMWarning("duplicate texture link: " + prop, element);
			}

			textures[prop] = tex;
		}
	}
}

// ------------------------------------------------------------------------------------------------
Material::~Material() {
}

// ------------------------------------------------------------------------------------------------
Texture::Texture(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Object(id, element, name), uvScaling(1.0f, 1.0f) {
	const ScopePtr sc = GetRequiredScope(element);

	const ElementPtr Type = sc->GetElement("Type");
	const ElementPtr FileName = sc->GetElement("FileName");
	const ElementPtr RelativeFilename = sc->GetElement("RelativeFilename");
	const ElementPtr ModelUVTranslation = sc->GetElement("ModelUVTranslation");
	const ElementPtr ModelUVScaling = sc->GetElement("ModelUVScaling");
	const ElementPtr Texture_Alpha_Source = sc->GetElement("Texture_Alpha_Source");
	const ElementPtr Cropping = sc->GetElement("Cropping");

	if (Type) {
		type = ParseTokenAsString(GetRequiredToken(Type, 0));
	}

	if (FileName) {
		fileName = ParseTokenAsString(GetRequiredToken(FileName, 0));
	}

	if (RelativeFilename) {
		relativeFileName = ParseTokenAsString(GetRequiredToken(RelativeFilename, 0));
	}

	if (ModelUVTranslation) {
		uvTrans = Vector2(ParseTokenAsFloat(GetRequiredToken(ModelUVTranslation, 0)),
				ParseTokenAsFloat(GetRequiredToken(ModelUVTranslation, 1)));
	}

	if (ModelUVScaling) {
		uvScaling = Vector2(ParseTokenAsFloat(GetRequiredToken(ModelUVScaling, 0)),
				ParseTokenAsFloat(GetRequiredToken(ModelUVScaling, 1)));
	}

	if (Cropping) {
		crop[0] = ParseTokenAsInt(GetRequiredToken(Cropping, 0));
		crop[1] = ParseTokenAsInt(GetRequiredToken(Cropping, 1));
		crop[2] = ParseTokenAsInt(GetRequiredToken(Cropping, 2));
		crop[3] = ParseTokenAsInt(GetRequiredToken(Cropping, 3));
	} else {
		// vc8 doesn't support the crop() syntax in initialization lists
		// (and vc9 WARNS about the new (i.e. compliant) behaviour).
		crop[0] = crop[1] = crop[2] = crop[3] = 0;
	}

	if (Texture_Alpha_Source) {
		alphaSource = ParseTokenAsString(GetRequiredToken(Texture_Alpha_Source, 0));
	}

	// 3DS Max and FBX SDK use "Scaling" and "Translation" instead of "ModelUVScaling" and "ModelUVTranslation". Use these properties if available.
	bool ok = true;
	const Vector3 &scaling = PropertyGet<Vector3>(this, "Scaling", ok);
	if (ok) {
		uvScaling.x = scaling.x;
		uvScaling.y = scaling.y;
	}

	const Vector3 &trans = PropertyGet<Vector3>(this, "Translation", ok);
	if (ok) {
		uvTrans.x = trans.x;
		uvTrans.y = trans.y;
	}

	// resolve video links
	if (doc.Settings().readTextures) {
		const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID());
		for (const Connection *con : conns) {
			const Object *const ob = con->SourceObject();
			if (!ob) {
				DOMWarning("failed to read source object for texture link, ignoring", element);
				continue;
			}

			const Video *const video = dynamic_cast<const Video *>(ob);
			if (video) {
				media = video;
			}
		}
	}
}

Texture::~Texture() {
}

LayeredTexture::LayeredTexture(uint64_t id, const ElementPtr element, const Document & /*doc*/, const std::string &name) :
		Object(id, element, name), blendMode(BlendMode_Modulate), alpha(1) {
	const ScopePtr sc = GetRequiredScope(element);

	ElementPtr BlendModes = sc->GetElement("BlendModes");
	ElementPtr Alphas = sc->GetElement("Alphas");

	if (BlendModes != nullptr) {
		blendMode = (BlendMode)ParseTokenAsInt(GetRequiredToken(BlendModes, 0));
	}
	if (Alphas != nullptr) {
		alpha = ParseTokenAsFloat(GetRequiredToken(Alphas, 0));
	}
}

LayeredTexture::~LayeredTexture() {
}

void LayeredTexture::fillTexture(const Document &doc) {
	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID());
	for (size_t i = 0; i < conns.size(); ++i) {
		const Connection *con = conns.at(i);

		const Object *const ob = con->SourceObject();
		if (!ob) {
			DOMWarning("failed to read source object for texture link, ignoring", element);
			continue;
		}

		const Texture *const tex = dynamic_cast<const Texture *>(ob);

		textures.push_back(tex);
	}
}

// ------------------------------------------------------------------------------------------------
Video::Video(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Object(id, element, name) {
	const ScopePtr sc = GetRequiredScope(element);

	const ElementPtr Type = sc->GetElement("Type");
	// File Version 7500 Crashes if this is not checked fully.
	// As of writing this comment 7700 exists, in August 2020
	ElementPtr FileName = nullptr;
	if (HasElement(sc, "Filename")) {
		FileName = (ElementPtr)sc->GetElement("Filename");
	} else if (HasElement(sc, "FileName")) {
		FileName = (ElementPtr)sc->GetElement("FileName");
	} else {
		print_error("file has invalid video material returning...");
		return;
	}
	const ElementPtr RelativeFilename = sc->GetElement("RelativeFilename");
	const ElementPtr Content = sc->GetElement("Content");

	if (Type) {
		type = ParseTokenAsString(GetRequiredToken(Type, 0));
	}

	if (FileName) {
		fileName = ParseTokenAsString(GetRequiredToken(FileName, 0));
	}

	if (RelativeFilename) {
		relativeFileName = ParseTokenAsString(GetRequiredToken(RelativeFilename, 0));
	}

	if (Content && !Content->Tokens().empty()) {
		//this field is omitted when the embedded texture is already loaded, let's ignore if it's not found
		try {
			const Token *token = GetRequiredToken(Content, 0);
			const char *data = token->begin();
			if (!token->IsBinary()) {
				if (*data != '"') {
					DOMError("embedded content is not surrounded by quotation marks", element);
				} else {
					size_t targetLength = 0;
					const size_t numTokens = Content->Tokens().size();
					// First time compute size (it could be large like 64Gb and it is good to allocate it once)
					for (uint32_t tokenIdx = 0; tokenIdx < numTokens; ++tokenIdx) {
						const Token *dataToken = GetRequiredToken(Content, tokenIdx);
						size_t tokenLength = dataToken->end() - dataToken->begin() - 2; // ignore double quotes
						const char *base64data = dataToken->begin() + 1;
						const size_t outLength = Util::ComputeDecodedSizeBase64(base64data, tokenLength);
						if (outLength == 0) {
							DOMError("Corrupted embedded content found", element);
						}
						targetLength += outLength;
					}
					if (targetLength == 0) {
						DOMError("Corrupted embedded content found", element);
					} else {
						content = new uint8_t[targetLength];
						contentLength = static_cast<uint64_t>(targetLength);
						size_t dst_offset = 0;
						for (uint32_t tokenIdx = 0; tokenIdx < numTokens; ++tokenIdx) {
							const Token *dataToken = GetRequiredToken(Content, tokenIdx);
							ERR_FAIL_COND(!dataToken);
							size_t tokenLength = dataToken->end() - dataToken->begin() - 2; // ignore double quotes
							const char *base64data = dataToken->begin() + 1;
							dst_offset += Util::DecodeBase64(base64data, tokenLength, content + dst_offset, targetLength - dst_offset);
						}
						if (targetLength != dst_offset) {
							delete[] content;
							contentLength = 0;
							DOMError("Corrupted embedded content found", element);
						}
					}
				}
			} else if (static_cast<size_t>(token->end() - data) < 5) {
				DOMError("binary data array is too short, need five (5) bytes for type signature and element count", element);
			} else if (*data != 'R') {
				DOMWarning("video content is not raw binary data, ignoring", element);
			} else {
				// read number of elements
				uint32_t len = 0;
				::memcpy(&len, data + 1, sizeof(len));
				AI_SWAP4(len);

				contentLength = len;

				content = new uint8_t[len];
				::memcpy(content, data + 5, len);
			}
		} catch (...) {
			//			//we don't need the content data for contents that has already been loaded
			//			ASSIMP_LOG_VERBOSE_DEBUG_F("Caught exception in FBXMaterial (likely because content was already loaded): ",
			//									   runtimeError.what());
		}
	}
}

Video::~Video() {
	if (content) {
		delete[] content;
	}
}
} // namespace FBXDocParser