#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
#include "ball.h"    // for Ball
#include "external/texture.h"  // for Texture

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;

    // 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;
        int ball_colors[8][3];
    };

    // Temas de colores definidos
    ThemeColors themes_[4] = {
        // SUNSET: Naranjas, rojos, amarillos, rosas
        {180.0f / 255.0f, 140.0f / 255.0f, 100.0f / 255.0f,  // Fondo superior (naranja suave)
            40.0f / 255.0f, 20.0f / 255.0f, 60.0f / 255.0f,     // Fondo inferior (púrpura oscuro)
            {{255, 140, 0}, {255, 69, 0}, {255, 215, 0}, {255, 20, 147}, {255, 99, 71}, {255, 165, 0}, {255, 192, 203}, {220, 20, 60}}},
        // OCEAN: Azules, turquesas, blancos
        {100.0f / 255.0f, 150.0f / 255.0f, 200.0f / 255.0f,  // Fondo superior (azul cielo)
            20.0f / 255.0f, 40.0f / 255.0f, 80.0f / 255.0f,     // Fondo inferior (azul marino)
            {{0, 191, 255}, {0, 255, 255}, {32, 178, 170}, {176, 224, 230}, {70, 130, 180}, {0, 206, 209}, {240, 248, 255}, {64, 224, 208}}},
        // NEON: Cian, magenta, verde lima, amarillo vibrante
        {20.0f / 255.0f, 20.0f / 255.0f, 40.0f / 255.0f,  // Fondo superior (negro azulado)
            0.0f / 255.0f, 0.0f / 255.0f, 0.0f / 255.0f,       // Fondo inferior (negro)
            {{0, 255, 255}, {255, 0, 255}, {50, 205, 50}, {255, 255, 0}, {255, 20, 147}, {0, 255, 127}, {138, 43, 226}, {255, 69, 0}}},
        // FOREST: Verdes, marrones, amarillos otoño
        {144.0f / 255.0f, 238.0f / 255.0f, 144.0f / 255.0f,  // Fondo superior (verde claro)
            101.0f / 255.0f, 67.0f / 255.0f, 33.0f / 255.0f,    // Fondo inferior (marrón tierra)
            {{34, 139, 34}, {107, 142, 35}, {154, 205, 50}, {255, 215, 0}, {210, 180, 140}, {160, 82, 45}, {218, 165, 32}, {50, 205, 50}}}
    };

    // 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 pushUpBalls();
    void switchBallsGravity();
    void changeGravityDirection(GravityDirection direction);
    void toggleVSync();
    void toggleFullscreen();
    std::string gravityDirectionToString(GravityDirection direction) const;

    // 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);
};