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// SSPHH/Fluxions/Unicornfish/Viperfish/Hatchetfish/Sunfish/KASL/GLUT Extensions
// Copyright (C) 2017 Jonathan Metzgar
// All rights reserved.
//
// This program is free software : you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.If not, see <https://www.gnu.org/licenses/>.
//
// For any other type of licensing, please contact me at [email protected]
#ifndef FLUXIONS_SIMPLE_MATERIALS_HPP
#define FLUXIONS_SIMPLE_MATERIALS_HPP
 
#include <fluxions_stdcxx.hpp>
#include <fluxions_fileio.hpp>
#include <fluxions_simple_texture.hpp>
#include <fluxions_resource_manager.hpp>
#include <fluxions_simple_property.hpp>
 
namespace Fluxions
{
    using namespace std;
 
 
    struct SimpleMaterial
    {
        Vector3f Kd;
        Vector3f Ks;
        Vector3f Ke;
        Vector3f Ka;
        Vector3f Tf; // Translucency;   // Tf
        float Tr = 0.0f; // TranslucencyLevel -- same as (1 - d)
        Vector3f Refract;
        Vector3f Opacity;
        float Ns = 0.0f; // Specular exponent [0 <= Ns <= 1000]
        float Ni = 0.0f;
        float d = 1.0f; // dissolved -- same as (1 - Tr)
 
        float PBm = 0.0f; // for roughness
        float PBk = 0.0f; // for metals
        float PBKdm = 0.0f; // for diffuse roughness (Oren-Nayer)
        float PBKsm = 0.0f; // for specular roughness (Cook-Torrance)
        float PBior = 0.0f; // for Fresnel reflection (Cook-Torrance)
        float PBGGXgamma = 0.11f; // for GGX BRDF (0.0 - 1.0 maps to 1.0 to 10.0 in the shader)
        string PBmap;
 
        float EmissionGlossiness;
        float ReflectFresnel;
        float RefractGlossiness;
        float ReflectGlossiness;
        float AnisotropyAmount;
        float AnisotropyRotation;
        Vector3f AttenuationColor;
        float AttenuationDistance;
        Vector3f ScatteringAlbedo;
        float MeanCosine;
        vector<string> RefractMode;
        bool HasRoundedCorners = false;
        float RoundedCorners;
        bool IsPortal = false;
        bool HasIesProfile = false;
        string IesProfileFilename;
        Matrix4f IesProfileMatrix;
        bool IesProfileKeepSharp;
        vector<string> Invisible;
        string map_Ka;
        string map_Kd;
        string map_Ks;
        string map_Ke;
        string map_d;
        string map_opacity;
        string map_Ns;
        string map_Ni;
        string map_Tr;// translucency;
        string map_Tf;//Tf translucencyLevel;
        string map_refract;
        string map_anisotropy;
        string map_anisorotation;
        string map_scatteringAlbedo;
        string map_attenuation;
        string map_normal;
        string map_bump;
 
        SimpleAssociativePropertyList Properties;
    };
 
 
    struct SimpleMap
    {
        string mapName;
        GLuint mapId;
        string pathname;
        string shader;
        GLuint textureId;
        GLuint samplerId;
        GLint unitId; // we're not using GLenum here because unitId can be < 0 and no overflow is expected.
        GLint map_loc;
        GLint map_mix_loc;
        SimpleTexture textureObject;
    };
 
 
    ostream & WriteMaterial(ostream &ostr, const SimpleMaterial &mtl);
    istream & ReadMaterial(istream &istr, SimpleMaterial &mtl);
    void SetMaterialDefaults(SimpleMaterial &mtl);
 
 
    struct SimpleMaterialLibrary
    {
        TResourceManager<SimpleMap> maps;
        TResourceManager<SimpleMaterial> mtls;
        FilePathInfo fpi;
        string name;
 
        SimpleMaterialLibrary() { }
        ~SimpleMaterialLibrary() { }
    };
 
 
    class SimpleMaterialSystem
    {
    private:
        string defaultName = "<INVALIDMATERIAL>";
        string currentMtlLibName;
        GLuint currentMtlLibId = 0;
        string currentMtlName;
        GLuint currentMtlId = 0;
 
        SimpleMaterialLibrary *currentMtlLibPtr = nullptr;
        SimpleMaterial *currentMtlPtr = nullptr;
 
        TResourceManager<SimpleMaterialLibrary> mtllibs;
        TResourceManager<string> shaderMaps;
 
        map<string, string> maps_paths;
        string defaultMapPath = "<UNKNOWN>";
 
        void SynchronizeIds();
    public:
        SimpleMaterialSystem();
        ~SimpleMaterialSystem();
 
        void Clear();
 
        auto begin() -> decltype(mtllibs.begin()) { return mtllibs.begin(); }
        auto end() -> decltype(mtllibs.end()) { return mtllibs.end(); }
        auto size() -> decltype(mtllibs.size()) { return mtllibs.size(); }
 
        bool Save(const string &path);
        bool Load(const string &mtllibName, const string &filename);
        bool Save(const string &mtllibName, const string &filename);
 
        SimpleMaterialLibrary *CreateLibrary(const string &name);
        SimpleMaterial *CreateMaterial(const string &name);
 
        void DeleteLibrary(const string &name);
        void DeleteMaterial(const string &name);
        void DeleteLibraryMaterial(const string &mtllibName, const string &mtlName);
 
        SimpleMaterialLibrary *SetLibrary(const string &name);
        SimpleMaterial *SetMaterial(const string &name);
        SimpleMaterial *SetLibraryMaterial(const string &mtllibName, const string &mtlName);
        const SimpleMaterial *GetLibraryMaterial(const string &mtllibName, const string &mtlName) const;
        SimpleMaterial *GetCurrentMaterial() { return currentMtlPtr; }
 
        const string & GetLibraryName();
        const string & GetMaterialName();
        const string & GetMaterialName(GLuint id);
 
        GLuint GetLibraryId();
        GLuint GetMaterialId();
        GLuint GetLibraryId(const string &name);
        GLuint GetMaterialId(const string &name);
        GLuint GetLibraryMaterialId(const string &mtllibName, const string &mtlName);
 
        bool AddMap(const string &path, const string &filename);
        bool AddMapShader(const string &name, const string &shader);
        void LoadMaps();
        SimpleMap *GetTextureMap(const string &name);
        const SimpleMap *GetTextureMap(const string &name) const;
 
        const string & GetMapPath(const string & mapName) const;
    };
}
 
#endif