/*
Open Asset Import Library (assimp)
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*/

/** @file NFFLoader.h
 *  @brief Declaration of the NFF importer class.
 */
#ifndef AI_NFFLOADER_H_INCLUDED
#define AI_NFFLOADER_H_INCLUDED

#include "BaseImporter.h"
#include <assimp/types.h>
#include <assimp/material.h>
#include <vector>


namespace Assimp    {

// ----------------------------------------------------------------------------------
/** NFF (Neutral File Format) Importer class.
 *
 * The class implements both Eric Haynes NFF format and Sense8's NFF (NFF2) format.
 * Both are quite different and the loading code is somewhat dirty at
 * the moment. Sense8 should be moved to a separate loader.
*/
class NFFImporter : public BaseImporter
{
public:
    NFFImporter();
    ~NFFImporter();


public:

    // -------------------------------------------------------------------
    /** 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;

protected:

    // -------------------------------------------------------------------
    /** Return importer meta information.
     * See #BaseImporter::GetInfo for the details
     */
    const aiImporterDesc* GetInfo () const;

    // -------------------------------------------------------------------
    /** Imports the given file into the given scene structure.
    * See BaseImporter::InternReadFile() for details
    */
    void InternReadFile( const std::string& pFile, aiScene* pScene,
        IOSystem* pIOHandler);

private:


    // describes face material properties
    struct ShadingInfo
    {
        ShadingInfo()
            : color     (0.6f,0.6f,0.6f)
            , diffuse   (1.f,1.f,1.f)
            , specular  (1.f,1.f,1.f)
            , ambient   (0.f,0.f,0.f)
            , emissive  (0.f,0.f,0.f)
            , refracti  (1.f)
            , twoSided  (false) // for NFF2
            , shaded    (true)  // for NFF2
            , opacity   (1.f)
            , shininess (0.f)
            , mapping   (aiTextureMapping_UV)
        {}

        aiColor3D color,diffuse,specular,ambient,emissive;
        float refracti;

        std::string texFile;

        // For NFF2
        bool twoSided;
        bool shaded;
        float opacity, shininess;

        std::string name;

        // texture mapping to be generated for the mesh - uv is the default
        // it means: use UV if there, nothing otherwise. This property is
        // used for locked meshes.
        aiTextureMapping mapping;

        // shininess is ignored for the moment
        bool operator == (const ShadingInfo& other) const
        {
            return color == other.color     &&
                diffuse  == other.diffuse   &&
                specular == other.specular  &&
                ambient  == other.ambient   &&
                refracti == other.refracti  &&
                texFile  == other.texFile   &&
                twoSided == other.twoSided  &&
                shaded   == other.shaded;

            // Some properties from NFF2 aren't compared by this operator.
            // Comparing MeshInfo::matIndex should do that.
        }
    };

    // describes a NFF light source
    struct Light
    {
        Light()
            : intensity (1.f)
            , color     (1.f,1.f,1.f)
        {}

        aiVector3D position;
        float intensity;
        aiColor3D color;
    };

    enum PatchType
    {
        PatchType_Simple = 0x0,
        PatchType_Normals = 0x1,
        PatchType_UVAndNormals = 0x2
    };

    // describes a NFF mesh
    struct MeshInfo
    {
        MeshInfo(PatchType _pType, bool bL = false)
            : pType     (_pType)
            , bLocked   (bL)
            , radius    (1.f,1.f,1.f)
            , dir       (0.f,1.f,0.f)
            , matIndex  (0)
        {
            name[0] = '\0'; // by default meshes are unnamed
        }

        ShadingInfo shader;
        PatchType pType;
        bool bLocked;

        // for spheres, cones and cylinders: center point of the object
        aiVector3D center, radius, dir;

        char name[128];

        std::vector<aiVector3D> vertices, normals, uvs;
        std::vector<unsigned int> faces;

        // for NFF2
        std::vector<aiColor4D>  colors;
        unsigned int matIndex;
    };


    // -------------------------------------------------------------------
    /** Loads the material table for the NFF2 file format from an
     *  external file.
     *
     *  @param output Receives the list of output meshes
     *  @param path Path to the file (abs. or rel.)
     *  @param pIOHandler IOSystem to be used to open the file
    */
    void LoadNFF2MaterialTable(std::vector<ShadingInfo>& output,
        const std::string& path, IOSystem* pIOHandler);

};

} // end of namespace Assimp

#endif // AI_NFFIMPORTER_H_IN