/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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following conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  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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* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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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 "ByteSwapper.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;

    const char* const sh = shading.c_str();
    if(!strcmp(sh,"phong")) {
        templateName = "Material.FbxSurfacePhong";
    }
    else if(!strcmp(sh,"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);

    // 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) {
        //this field is ommited 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()) {
                DOMWarning("video content is not binary data, ignoring", &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 (runtime_error runtimeError) {
            //we don't need the content data for contents that has already been loaded
        }
    }

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


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

} //!FBX
} //!Assimp

#endif