add event system and use it to propagate to print traces

src/lib/sim/Simulation.cpp

@@ -7,6 +7,7 @@
 #include "CombatSystem.h"
 #include "DynamicBodySystem.h"
 #include "FactionComponent.h"
+#include "EventManager.h"
 #include "HealthComponent.h"
 #include "ModuleOwnerComponent.h"
 #include "MovementIntentSystem.h"
@@ -71,9 +72,13 @@ Simulation::Simulation(GameConfig config, unsigned int seed)
     }
 
     placeInitialStructures();
+	registerForEvents();
 }
 
-Simulation::~Simulation() = default;
+Simulation::~Simulation()
+{
+	unregisterForEvents();
+}
 
 const GameConfig& Simulation::config() const
 {
@@ -88,6 +93,7 @@ void Simulation::reset(GameConfig newConfig, unsigned int seed)
 
 void Simulation::reset(unsigned int seed)
 {
+	EventManager::destroyInstance();
     m_rng.seed(seed);
     m_currentTick              = 0;
     m_nextDepartureTick        = secondsToTicks(m_config.world.departureIntervalSeconds);
@@ -147,6 +153,8 @@ void Simulation::reset(unsigned int seed)
 
 void Simulation::tick()
 {
+	EventManager::getInstance()->processEvents();
+
     // Step 1: wave scheduler
     m_waveSystem->tickWaveScheduler(m_currentTick, *m_shipSystem,
                                     m_config.world.heightTiles);
@@ -199,8 +207,6 @@ void Simulation::tick()
     m_scrapSystem->tickDespawn(m_currentTick);
 
     ++m_currentTick;
-
-	PRINT_TRACES();
 }
 
 // ---------------------------------------------------------------------------
@@ -642,6 +648,11 @@ const EntityAdmin& Simulation::admin() const
     return m_admin;
 }
 
+void Simulation::handleEvent(std::shared_ptr<const TracePrintRequestedEvent> event)
+{
+	PRINT_TRACES();
+}
+
 BuildingId Simulation::allocateBuildingId()
 {
     return m_nextBuildingId++;

src/lib/sim/Simulation.h

@@ -10,15 +10,16 @@
 
 #include "BeltSystem.h"
 #include "EntityAdmin.h"
-
 #include "entt/entity/entity.hpp"
 #include "SchematicDropEvent.h"
 #include "BuildingType.h"
 #include "BuildingId.h"
+#include "EventHandler.h"
 #include "FireEvent.h"
 #include "GameConfig.h"
 #include "Rotation.h"
 #include "Tick.h"
+#include "TracePrintRequestedEvent.h"
 
 class AiSystem;
 class BuildingSystem;
@@ -29,7 +30,7 @@ class ShipSystem;
 class ScrapSystem;
 class WaveSystem;
 
-class Simulation
+class Simulation: public CombinedEventHandler<TracePrintRequestedEvent>
 {
 public:
     explicit Simulation(GameConfig config, unsigned int seed = 0);
@@ -83,6 +84,8 @@ public:
     const EntityAdmin&    admin() const;
 
 private:
+	void handleEvent(std::shared_ptr<const TracePrintRequestedEvent> event) override;
+
     BuildingId allocateBuildingId();  // Strictly increasing; never returns kInvalidBuildingId.
 
     // Populate HQ, player defence stations, and the first enemy station set.