src/openvic-simulation/misc/GameAdvancementHook.hpp


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#pragma once

#include <chrono>
#include <functional>
#include <vector>
#include "openvic-simulation/utility/Getters.hpp"

namespace OpenVic {
   // Conditionally advances game with provided behaviour
   // Class governs game speed and pause state
   class GameAdvancementHook {
   public:
      using AdvancementFunction = std::function<void()>;
      using RefreshFunction = std::function<void()>;
      using speed_t = int8_t;

      // Minimum number of miliseconds before the simulation advances
      static const std::vector<std::chrono::milliseconds> GAME_SPEEDS;

   private:
      using time_point_t = std::chrono::time_point<std::chrono::high_resolution_clock>;

      time_point_t last_polled_time;
      // A function pointer that advances the simulation, intended to be a capturing
      // lambda or something similar. May need to be reworked later
      AdvancementFunction trigger_function;
      RefreshFunction refresh_function;
      speed_t PROPERTY_CUSTOM_NAME(current_speed, get_simulation_speed);

   public:
      bool is_paused;

      GameAdvancementHook(
         AdvancementFunction tick_function, RefreshFunction update_function, bool start_paused = true, speed_t starting_speed = 0
      );

      void set_simulation_speed(speed_t speed);
      void increase_simulation_speed();
      void decrease_simulation_speed();
      bool can_increase_simulation_speed() const;
      bool can_decrease_simulation_speed() const;
      GameAdvancementHook& operator++();
      GameAdvancementHook& operator--();
      void conditionally_advance_game();
      void reset();
   };
}