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

Copyright (c) 2006-2020, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the
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
materials provided with the distribution.

* 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
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

----------------------------------------------------------------------
*/

/** @file PbrtExporter.h
* Declares the exporter class to write a scene to a pbrt file
*/
#ifndef AI_PBRTEXPORTER_H_INC
#define AI_PBRTEXPORTER_H_INC

#ifndef ASSIMP_BUILD_NO_PBRT_EXPORTER

#include <assimp/types.h>
//#include <assimp/material.h>
#include <assimp/StreamWriter.h> // StreamWriterLE
#include <assimp/Exceptional.h> // DeadlyExportError

#include <vector>
#include <map>
#include <set>
#include <unordered_set>
#include <memory> // shared_ptr
#include <sstream> // stringstream

struct aiScene;
struct aiNode;
struct aiMaterial;

namespace Assimp
{

class IOSystem;
class IOStream;
class ExportProperties;

// ---------------------------------------------------------------------
/** Helper class to export a given scene to a Pbrt file. */
// ---------------------------------------------------------------------
class PbrtExporter
{
public:
    /// Constructor for a specific scene to export
    PbrtExporter(const aiScene* pScene, IOSystem* pIOSystem,
        const std::string path, const std::string file);
    
    /// Destructor
    virtual ~PbrtExporter();

private:
    // the scene to export
    const aiScene* mScene;
    
    /// Stringstream to write all output into
    std::stringstream mOutput;

    /// The IOSystem for output
    IOSystem* mIOSystem;

    /// Path of the directory where the scene will be exported
    const std::string mPath;

    /// Name of the file (without extension) where the scene will be exported
    const std::string mFile;

private:
    //  A private set to keep track of which textures have been declared
    std::set<std::string> mTextureSet;

private:
    // Writing the comment header
    void WriteHeader();

    // Writing the metadata into a comment
    void WriteMetaData();

    // Writing the pbrt scene-wide rendering options
    void WriteSceneWide();

    // Writing the shapes to distinct files
    void WriteShapes();

    // Writing the pbrt world defintion
    void WriteWorldDefinition();

    // Writing the Camera data
    void WriteCameras();
    void WriteCamera(int i);
    
    // Writing the Embedded Texture data
    void WriteEmbeddedTextures();

    // Writing the Material data
    void WriteMaterials();
    void WriteMaterial(int i);
    void WriteNewTextures(aiMaterial* material);

    // Writing the Light data
    void WriteLights();
    
    // Writing the Object data
    void WriteObjects();
    void WriteObject(int i);

    // Writing the Object Instances
    void WriteObjectInstances();
    void WriteObjectInstance(aiNode* node, aiMatrix4x4 parentTransform);
};

} // namespace Assimp

#endif // ASSIMP_BUILD_NO_PBRT_EXPORTER

#endif // AI_PBRTEXPORTER_H_INC