5 files changed, 39 insertions, 5 deletions
diff --git a/src/game/game.cpp b/src/game/game.cpp
index c41364a..de2b4df 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -16,7 +16,8 @@ Game::Game(
 	  _cursor_controller(std::move(cursor_controller)),
 	  _generation_tracker(std::move(generation_tracker)),
 	  _status_manager(std::move(status_manager)),
-	  _user_input_observer(std::move(user_input_observer))
+	  _user_input_observer(std::move(user_input_observer)),
+	  _gen_update_speed_millis(1000)
 {
 }
 
@@ -129,14 +130,33 @@ void Game::on_update() noexcept
 		_status_manager->set_section_body(StatusLineSection::D, onoff ? "yes" : "no");
 	}
 
-	const auto time_since_last_update =
-		std::chrono::system_clock::now() - _last_update_time;
+	const auto time_now = std::chrono::system_clock::now();
+
+	const auto time_since_last_update = time_now - _last_update_time;
 
 	_status_manager->set_section_body(
 		StatusLineSection::F,
 		fmt::format("{} nanoseconds", time_since_last_update.count()));
 
-	_last_update_time = std::chrono::system_clock::now();
+	const auto time_since_last_gen_update =
+		std::chrono::duration_cast<std::chrono::milliseconds>(
+			time_now - _last_gen_update_time);
+
+	if (!_generation_tracker->get_is_paused() &&
+		time_since_last_gen_update.count() > _gen_update_speed_millis)
+	{
+		const auto new_current_gen = _generation_tracker->get_current_generation() + 1U;
+
+		_generation_tracker->set_current_generation(new_current_gen);
+
+		_status_manager->set_section_body(
+			StatusLineSection::E,
+			fmt::format("{}", new_current_gen));
+
+		_last_gen_update_time = time_now;
+	}
+
+	_last_update_time = time_now;
 }
 
 void Game::on_exit() const noexcept
diff --git a/src/game/game.hpp b/src/game/game.hpp
index 955269c..75fb165 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -33,7 +33,12 @@ private:
 	std::shared_ptr<IStatusManager> _status_manager;
 	std::shared_ptr<IUserInputObserver> _user_input_observer;
 
-	std::chrono::system_clock::time_point _last_update_time;
+	using TimePoint = std::chrono::system_clock::time_point;
+
+	TimePoint _last_update_time;
+	TimePoint _last_gen_update_time;
+
+	int _gen_update_speed_millis;
 
 	void _move_cursor(const Vector2 &direction) noexcept;
 };
diff --git a/src/game/generation_tracker.cpp b/src/game/generation_tracker.cpp
index 0a7a923..15b4ce4 100644
--- a/src/game/generation_tracker.cpp
+++ b/src/game/generation_tracker.cpp
@@ -7,6 +7,11 @@ auto GenerationTracker::get_current_generation() const noexcept -> uint32_t
 	return _current_generation;
 }
 
+void GenerationTracker::set_current_generation(uint32_t current_generation) noexcept
+{
+	_current_generation = current_generation;
+}
+
 auto GenerationTracker::get_is_paused() const noexcept -> bool
 {
 	return _is_paused;
diff --git a/src/game/generation_tracker.hpp b/src/game/generation_tracker.hpp
index bd15a3e..1a83d71 100644
--- a/src/game/generation_tracker.hpp
+++ b/src/game/generation_tracker.hpp
@@ -11,6 +11,8 @@ public:
 
 	[[nodiscard]] auto get_current_generation() const noexcept -> uint32_t override;
 
+	void set_current_generation(uint32_t current_generation) noexcept override;
+
 	[[nodiscard]] auto get_is_paused() const noexcept -> bool override;
 
 	void set_is_paused(bool is_paused) noexcept override;
diff --git a/src/interfaces/generation_tracker.hpp b/src/interfaces/generation_tracker.hpp
index ca2e36b..c3f6a7e 100644
--- a/src/interfaces/generation_tracker.hpp
+++ b/src/interfaces/generation_tracker.hpp
@@ -13,6 +13,8 @@ public:
 
 	[[nodiscard]] virtual auto get_current_generation() const noexcept -> uint32_t = 0;
 
+	virtual void set_current_generation(uint32_t current_generation) noexcept = 0;
+
 	[[nodiscard]] virtual auto get_is_paused() const noexcept -> bool = 0;
 
 	virtual void set_is_paused(bool is_paused) noexcept = 0;