/*

Open Asset Import Library (assimp)

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  following disclaimer.

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  copyright notice, this list of conditions and the

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*/

/** @file  PLYLoader.h

 *  @brief Declaration of the .ply importer class.

 */

#pragma once

#ifndef AI_PLYLOADER_H_INCLUDED

#define AI_PLYLOADER_H_INCLUDED

#include "PlyParser.h"

#include <assimp/BaseImporter.h>

#include <assimp/types.h>

#include <vector>

struct aiNode;

struct aiMaterial;

struct aiMesh;

namespace Assimp {

using namespace PLY;

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

/// @brief Importer class to load the stanford PLY file format

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

class PLYImporter final : public BaseImporter {

public:

    /// @brief Default constructor

    PLYImporter() = default;

    /// @brief Destructor

    ~PLYImporter() override;

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

    /// Returns whether the class can handle the format of the given file.

    /// @see BaseImporter::CanRead() for details.

    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const override;

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

    /// Extract a vertex from the DOM

    void LoadVertex(const PLY::Element *pcElement, const PLY::ElementInstance *instElement, unsigned int pos);

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

    /// @brief Extract a face from the DOM

    /// The function will also take care of the correct winding order of the triangles.

    /// @param pcElement The element containing the face data

    /// @param instElement The element instance containing the face data

    /// @param pos The position of the face in the element instance. This is needed to correctly assign the face to the mesh.

    void LoadFace(const PLY::Element *pcElement, const PLY::ElementInstance *instElement, unsigned int pos);

    /// @brief Will create a triangle from a triangle strip. 

    /// The function will use the first three vertices of the strip to create the first triangle, then the second,

    /// third and fourth vertex to create the second triangle and so on. The function will also take care of the correct 

    /// winding order of the triangles.

    /// @param instElement The element instance containing the triangle strip data

    /// @param iProperty   The index of the property containing the triangle strip data

    /// @param eType       The data type of the triangle strip data

    void createFromeTriStrip(const Assimp::PLY::ElementInstance *instElement, unsigned int iProperty, Assimp::PLY::EDataType eType);

protected:

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

    const aiImporterDesc *GetInfo() const override;

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

    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;

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

    /// @brief  Extract a material list from the DOM    

    /// @param pvOut          The output material list. The function will fill the list with the extracted materials.

    /// @param defaultTexture The default texture to use for the materials. This is needed to correctly assign the texture to the materials.

    /// @param pointsOnly     Whether the file contains only points. This is needed to correctly assign the material properties.

    void LoadMaterial(std::vector<aiMaterial *> *pvOut, std::string &defaultTexture, const bool pointsOnly);

private:

    unsigned char *mBuffer{nullptr};

    PLY::DOM *pcDOM{nullptr};

    aiMesh *mGeneratedMesh{nullptr};

};

} // end of namespace Assimp

#endif // AI_3DSIMPORTER_H_INC