#ifndef _ENGINE_H
#define _ENGINE_H

#include "shader.h"

static const std::string COMBINE_BUFFER = "_rt_FullFrameBuffer";
static const std::string MIPMAPPED_BUFFER = "_rt_MipMappedFrameBuffer";

namespace Mauri
{

struct View
{
    f32 width = 0.f;
    f32 height = 0.f;

    s32 ortho_width;
    s32 ortho_height;

    vec2 texel_size;
    vec2 texel_half_size;

    f32 scale;

    vec2 camera_pos;
    vec2 cursor_pos;

    f32 adjusted_width;
    f32 adjusted_height;

    auto center(f32 buffer_width, f32 buffer_height) -> void;

    auto center_scale_viewport() -> void;
    auto center_viewport(f32 buffer_width, f32 buffer_height) -> void;
    auto default_viewport(f32 buffer_width, f32 buffer_height) -> void;
};

class Scene;

class Engine
{
  public:
    Engine(Scene *scene, f32 rate, bool audio);
    ~Engine();

    Scene *scene;

    f32 rate;
    f32 time;

    bool audio_enabled;

    View view;

    mat4x4 default_mat;
    mat4x4 default_mat_inverse;

    RenderObject *default_object;
    RenderObject *flipped_object;
    RenderObject *fullscreen_object;

    Shader *shader;
    RenderShader *render_shader;

    Framebuffer *combine_buffer;
    std::vector<Framebuffer *> framebuffers;

    auto create_framebuffer(const std::string &name, f32 width, f32 height, f32 scale) -> void;

    auto get_framebuffer(const std::string &name) -> Framebuffer *;
    auto get_framebuffer_texture(const std::string &name) -> Texture *;

    auto update() -> void;
    auto draw() -> void;
    auto run() -> void;
};

} // namespace Mauri

#endif // _ENGINE_H