vibe3_physics/source/engine.h

#pragma once

#include <SDL3/SDL_events.h>   // for SDL_Event
#include <SDL3/SDL_render.h>   // for SDL_Renderer
#include <SDL3/SDL_stdinc.h>   // for Uint64
#include <SDL3/SDL_video.h>    // for SDL_Window

#include <array>     // for array
#include <memory>    // for unique_ptr, shared_ptr
#include <string>    // for string
#include <vector>    // for vector

#include "defines.h"  // for GravityDirection, ColorTheme, ShapeType
#include "ball.h"    // for Ball
#include "external/texture.h"  // for Texture
#include "shapes/shape.h"       // for Shape (interfaz polimórfica)

class Engine {
public:
    // Interfaz pública
    bool initialize();
    void run();
    void shutdown();

private:
    // Recursos SDL
    SDL_Window* window_ = nullptr;
    SDL_Renderer* renderer_ = nullptr;
    std::shared_ptr<Texture> texture_ = nullptr;

    // Estado del simulador
    std::vector<std::unique_ptr<Ball>> balls_;
    std::array<int, 8> test_ = {1, 10, 100, 500, 1000, 10000, 50000, 100000};
    GravityDirection current_gravity_ = GravityDirection::DOWN;
    int scenario_ = 0;
    bool should_exit_ = false;

    // Sistema de timing
    Uint64 last_frame_time_ = 0;
    float delta_time_ = 0.0f;

    // UI y debug
    bool show_debug_ = false;
    bool show_text_ = true;

    // Sistema de zoom dinámico
    int current_window_zoom_ = WINDOW_ZOOM;
    std::string text_;
    int text_pos_ = 0;
    Uint64 text_init_time_ = 0;

    // FPS y V-Sync
    Uint64 fps_last_time_ = 0;
    int fps_frame_count_ = 0;
    int fps_current_ = 0;
    std::string fps_text_ = "FPS: 0";
    bool vsync_enabled_ = true;
    std::string vsync_text_ = "VSYNC ON";
    bool fullscreen_enabled_ = false;
    bool real_fullscreen_enabled_ = false;

    // Auto-restart system
    Uint64 all_balls_stopped_start_time_ = 0;  // Momento cuando todas se pararon
    bool all_balls_were_stopped_ = false;       // Flag de estado anterior
    static constexpr Uint64 AUTO_RESTART_DELAY = 5000;  // 5 segundos en ms

    // Resolución dinámica para modo real fullscreen
    int current_screen_width_ = SCREEN_WIDTH;
    int current_screen_height_ = SCREEN_HEIGHT;

    // Sistema de temas
    ColorTheme current_theme_ = ColorTheme::SUNSET;

    // Estructura de tema de colores
    struct ThemeColors {
        float bg_top_r, bg_top_g, bg_top_b;
        float bg_bottom_r, bg_bottom_g, bg_bottom_b;
        std::vector<Color> ball_colors;
    };

    // Temas de colores definidos
    ThemeColors themes_[5];

    // Sistema de Figuras 3D (polimórfico)
    SimulationMode current_mode_ = SimulationMode::PHYSICS;
    ShapeType current_shape_type_ = ShapeType::SPHERE;     // Tipo de figura actual
    ShapeType last_shape_type_ = ShapeType::SPHERE;        // Última figura para toggle F
    std::unique_ptr<Shape> active_shape_;                  // Puntero polimórfico a figura activa
    float shape_scale_factor_ = 1.0f;                      // Factor de escala manual (Numpad +/-)
    bool depth_zoom_enabled_ = true;                       // Zoom por profundidad Z activado

    // Batch rendering
    std::vector<SDL_Vertex> batch_vertices_;
    std::vector<int> batch_indices_;

    // Métodos principales del loop
    void calculateDeltaTime();
    void update();
    void handleEvents();
    void render();

    // Métodos auxiliares
    void initBalls(int value);
    void setText();
    void pushBallsAwayFromGravity();
    void switchBallsGravity();
    void enableBallsGravityIfDisabled();
    void forceBallsGravityOn();
    void forceBallsGravityOff();
    void changeGravityDirection(GravityDirection direction);
    void toggleVSync();
    void toggleFullscreen();
    void toggleRealFullscreen();
    std::string gravityDirectionToString(GravityDirection direction) const;
    void initializeThemes();
    void checkAutoRestart();
    void performRandomRestart();

    // Sistema de zoom dinámico
    int calculateMaxWindowZoom() const;
    void setWindowZoom(int new_zoom);
    void zoomIn();
    void zoomOut();

    // Rendering
    void renderGradientBackground();
    void addSpriteToBatch(float x, float y, float w, float h, int r, int g, int b, float scale = 1.0f);

    // Sistema de Figuras 3D
    void toggleShapeMode(bool force_gravity_on_exit = true);   // Toggle PHYSICS ↔ última figura (tecla F)
    void activateShape(ShapeType type);                        // Activar figura específica (teclas Q/W/E/R/Y/U/I)
    void updateShape();                                        // Actualizar figura activa
    void generateShape();                                      // Generar puntos de figura activa
    void clampShapeScale();                                    // Limitar escala para evitar clipping
};