/*     _______________   ,----------------------------------------------------------------.
      //`````````````\\  \                                                                 \
     //~~~~~~~~~~~~~~~\\  \   by @ohsqueezy           &  @sleepin                           \ 
    //=================\\  \     [ohsqueezy.itch.io]     [sleepin.itch.io]                   \ 
   //                   \\  \                                                                 \ 
  //                     \\  \  code released under the zlib license [git.nugget.fun/pudding]  \ 
 //      ☆ GUNKISS ☆      \\  \                                                                 \
//_________________________\\  `---------------------------------------------------------------*/

#ifndef MODEL_H_
#define MODEL_H_

/* GL functions */
#if defined(__EMSCRIPTEN__)
#include <GL/glew.h>
#else
#include "glew/glew.h"
#endif

#include <iostream>
#include <string>
#include <map>
#include <memory>
#include <iterator>
#include "glm/glm.hpp"
#include "Attributes.hpp"
#include "Texture.hpp"

class Model
{

protected:

    std::map<std::string, std::shared_ptr<sb::Attributes>> model_attributes;
    std::map<std::string, sb::Texture> model_texture;
    glm::mat4 model_transformation = glm::mat4(1);

public:

    Model();
    Model(const std::map<std::string, std::shared_ptr<sb::Attributes>>&);
    Model(const std::map<std::string, sb::Attributes>&);
    Model(const std::initializer_list<std::string>&);
    std::map<std::string, std::shared_ptr<sb::Attributes>>& attributes();
    std::shared_ptr<sb::Attributes>& attributes(const std::string&);
    void attributes(const std::string&, const sb::Attributes&);
    void attributes(const std::string&, const std::shared_ptr<sb::Attributes>&);
    std::shared_ptr<sb::Attributes>& operator[](const std::string&);
    void enable();
    void disable();
    sb::Texture& texture(const std::string&);
    void texture(const std::string&, const sb::Texture&);
    void transformation(const glm::mat4&);
    std::size_t size();
    operator glm::mat4() const;

};

class Plane : public Model
{

public:

    inline const static std::shared_ptr<sb::Attributes> position = std::make_shared<sb::Attributes>(sb::Attributes{
            {-1.0f, 1.0f}, {1.0f, 1.0f},  {-1.0f, -1.0f},
            {1.0f, 1.0f}, {1.0f, -1.0f}, {-1.0f, -1.0f}
        });
    inline const static std::shared_ptr<sb::Attributes> uv = std::make_shared<sb::Attributes>(sb::Attributes{
            {0.0f, 1.0f}, {1.0f, 1.0f}, {0.0f, 0.0f},
            {1.0f, 1.0f}, {1.0f, 0.0f}, {0.0f, 0.0f}
        });

    Plane() : Model(std::map<std::string, std::shared_ptr<sb::Attributes>>({{"position", position}, {"uv", uv}})) {}

};

/* Plane that stores multiple textures which can be cycled through and looped. Only one texture is
 * active at a time, returned by Background::current. Cycle only goes forward, using Background::next. */
class Background : public Plane
{

private:

    std::uint8_t offset = 0;

public:

    void next();
    const sb::Texture& current() const;

};

class CameraView : public Plane
{

private:

    bool swapped = false;

public:

    CameraView();
    void generate(const glm::vec2&);
    sb::Texture& current();
    sb::Texture& free();
    void swap();

};

#endif