/*
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  following disclaimer.

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

namespace Assimp {
namespace FBX {

    using namespace Util;

// ------------------------------------------------------------------------------------------------
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";
    }

    std::string templateName;

    // lower-case shading because Blender (for example) writes "Phong"
    std::transform(shading.begin(), shading.end(), shading.begin(), Assimp::ToLower<char>);
    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 (!con->PropertyName().length()) {
            continue;
        }

        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);
        if(!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;
        }

    }
}


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


// ------------------------------------------------------------------------------------------------
Texture::Texture(uint64_t id, const Element& element, const Document& doc, const std::string& name)
: Object(id,element,name)
, uvScaling(1.0f,1.0f)
, media(0)
{
    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(ParseTokenAsFloat(GetRequiredToken(*ModelUVTranslation,0)),
            ParseTokenAsFloat(GetRequiredToken(*ModelUVTranslation,1))
        );
    }

    if(ModelUVScaling) {
        uvScaling = aiVector2D(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));
    }

    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;
    }

    // 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 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(BlendModes!=0)
    {
        blendMode = (BlendMode)ParseTokenAsInt(GetRequiredToken(*BlendModes,0));
    }
    if(Alphas!=0)
    {
        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 Element& element, const Document& doc, const std::string& name)
: Object(id,element,name)
, contentLength(0)
, content(0)
{
    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_DEBUG_F("Caught exception in FBXMaterial (likely because content was already loaded): ",
                    runtimeError.what());
        }
    }

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


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

} //!FBX
} //!Assimp

#endif
