/*

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/** @file  FBXMaterial.cpp

 *  @brief Assimp::FBX::Material and Assimp::FBX::Texture implementation

 */

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include "FBXParser.h"

#include "FBXDocument.h"

#include "FBXImporter.h"

#include "FBXImportSettings.h"

#include "FBXDocumentUtil.h"

#include "FBXProperties.h"

#include <assimp/ByteSwapper.h>

#include <assimp/ParsingUtils.h>

#include "FBXUtil.h"

namespace Assimp {

namespace FBX {

using namespace Util;

static float ParseTextureUVComponent(const Token &token) {

    // Metashape can store these coordinates as binary int32 rather than float/double.

    if (token.IsBinary() && token.begin() != token.end() && *token.begin() == 'I') {

        return static_cast<float>(ParseTokenAsInt(token));

    }

    return ParseTokenAsFloat(token);

}

// ------------------------------------------------------------------------------------------------

Material::Material(uint64_t id, const Element& element, const Document& doc, const std::string& name) :

        Object(id,element,name) {

    const Scope& sc = GetRequiredScope(element);

    const Element* const ShadingModel = sc["ShadingModel"];

    const Element* const MultiLayer = sc["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";

    }

    // lower-case shading because Blender (for example) writes "Phong"

    for (size_t i = 0; i < shading.length(); ++i) {

        shading[i] = static_cast<char>(tolower(static_cast<unsigned char>(shading[i])));

    }

    std::string templateName;

    if(shading == "phong") {

        templateName = "Material.FbxSurfacePhong";

    } else if(shading == "lambert") {

        templateName = "Material.FbxSurfaceLambert";

    } else {

        DOMWarning("shading mode not recognized: " + shading,&element);

    }

    props = GetPropertyTable(doc,templateName,element,sc);

    // resolve texture links

    const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID());

    for(const Connection* con : conns) {

        // texture link to properties, not objects

        if ( 0 == con->PropertyName().length()) {

            continue;

        }

        const Object* const ob = con->SourceObject();

        if(nullptr == ob) {

            DOMWarning("failed to read source object for texture link, ignoring",&element);

            continue;

        }

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

        if(nullptr == tex) {

            const LayeredTexture* const layeredTexture = dynamic_cast<const 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*)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;

        }

    }

}

// ------------------------------------------------------------------------------------------------

Texture::Texture(uint64_t id, const Element& element, const Document& doc, const std::string& name) :

        Object(id,element,name),

        uvTrans(0.0f, 0.0f),

        uvScaling(1.0f,1.0f),

        uvRotation(0.0f),

        type(),

        relativeFileName(),

        fileName(),

        alphaSource(),

        props(),

        media(nullptr) {

    const Scope& sc = GetRequiredScope(element);

    const Element* const Type = sc["Type"];

    const Element* const FileName = sc["FileName"];

    const Element* const RelativeFilename = sc["RelativeFilename"];

    const Element* const ModelUVTranslation = sc["ModelUVTranslation"];

    const Element* const ModelUVScaling = sc["ModelUVScaling"];

    const Element* const Texture_Alpha_Source = sc["Texture_Alpha_Source"];

    const Element* const Cropping = sc["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 = aiVector2D(ParseTextureUVComponent(GetRequiredToken(*ModelUVTranslation, 0)),

                ParseTextureUVComponent(GetRequiredToken(*ModelUVTranslation, 1)));

    }

    if(ModelUVScaling) {

        uvScaling = aiVector2D(ParseTextureUVComponent(GetRequiredToken(*ModelUVScaling, 0)),

                ParseTextureUVComponent(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));

    }

    props = GetPropertyTable(doc,"Texture.FbxFileTexture",element,sc);

    // 3DS Max and FBX SDK use "Scaling" and "Translation" instead of "ModelUVScaling" and "ModelUVTranslation". Use these properties if available.

    bool ok;

    const aiVector3D& scaling = PropertyGet<aiVector3D>(*props, "Scaling", ok);

    if (ok) {

        uvScaling.x = scaling.x;

        uvScaling.y = scaling.y;

    }

    const aiVector3D& trans = PropertyGet<aiVector3D>(*props, "Translation", ok);

    if (ok) {

        uvTrans.x = trans.x;

        uvTrans.y = trans.y;

    }

    const aiVector3D &rotation = PropertyGet<aiVector3D>(*props, "Rotation", ok);

    if (ok) {

        uvRotation = rotation.z;

    }

    // 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 (nullptr == 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() = default;

LayeredTexture::LayeredTexture(uint64_t id, const Element& element, const Document& /*doc*/, const std::string& name) :

        Object(id,element,name),

        blendMode(BlendMode_Modulate),

        alpha(1) {

    const Scope& sc = GetRequiredScope(element);

    const Element* const BlendModes = sc["BlendModes"];

    const Element* const Alphas = sc["Alphas"];

    if (nullptr != BlendModes) {

        blendMode = (BlendMode)ParseTokenAsInt(GetRequiredToken(*BlendModes,0));

    }

    if (nullptr != Alphas) {

        alpha = ParseTokenAsFloat(GetRequiredToken(*Alphas,0));

    }

}

LayeredTexture::~LayeredTexture() = default;

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 (nullptr == 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 Element &element, const Document &doc, const std::string &name) :

        Object(id, element, name),

        contentLength(0),

        content(nullptr) {

    const Scope& sc = GetRequiredScope(element);

    const Element* const Type = sc["Type"];

    const Element* const FileName = sc.FindElementCaseInsensitive("FileName");  //some files retain the information as "Filename", others "FileName", who knows

    const Element* const RelativeFilename = sc["RelativeFilename"];

    const Element* const Content = sc["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;

                    auto 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);

                    }

                    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);

                        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 (const runtime_error& runtimeError) {

            //we don't need the content data for contents that has already been loaded

            ASSIMP_LOG_VERBOSE_DEBUG("Caught exception in FBXMaterial (likely because content was already loaded): ",

                    runtimeError.what());

        }

    }

    props = GetPropertyTable(doc,"Video.FbxVideo",element,sc);

}

Video::~Video() {

    if (contentLength > 0) {

        delete[] content;

    }

}

} //!FBX

} //!Assimp

#endif // ASSIMP_BUILD_NO_FBX_IMPORTER