when there is only one player remaing, goes back

CMakeLists.txt

@@ -132,6 +132,8 @@ set(SOURCES
 	sources/Runner/CreditScene.cpp
 	sources/Component/Score/ScoreComponent.cpp
 	sources/Component/Score/ScoreComponent.hpp
+	sources/System/EndCondition/EndConditionSystem.hpp
+	sources/System/EndCondition/EndConditionSystem.cpp
 )
 add_executable(bomberman
                sources/main.cpp

sources/System/EndCondition/EndConditionSystem.cpp

@@ -0,0 +1,21 @@
+
+#include "EndConditionSystem.hpp"
+#include <map>
+#include "Runner/Runner.hpp"
+
+namespace BBM {
+
+	EndConditionSystem::EndConditionSystem(WAL::Wal &wal)
+		: System(wal)
+	{}
+
+	void EndConditionSystem::onSelfUpdate()
+	{
+		unsigned int alivePlayersCount = 0;
+
+        for (auto & [_ , healthComponent]: this->_wal.getScene()->view<HealthComponent>())
+            alivePlayersCount += (healthComponent.getHealthPoint() != 0);
+        if (alivePlayersCount <= 1)
+            Runner::gameState.nextScene = Runner::gameState.MainMenuScene;
+	}
+}

sources/System/EndCondition/EndConditionSystem.hpp

@@ -0,0 +1,26 @@
+
+#pragma once
+
+#include "System/System.hpp"
+#include "Component/Score/ScoreComponent.hpp"
+#include "Component/Health/HealthComponent.hpp"
+#include "Wal.hpp"
+
+namespace BBM
+{
+	class EndConditionSystem : public WAL::System<ScoreComponent, HealthComponent>
+	{
+	public:
+		//! @inherit
+		void onSelfUpdate() override;
+		
+		//! @brief ctor
+		EndConditionSystem(WAL::Wal &wal);
+		//! @brief Default copy ctor
+		EndConditionSystem(const EndConditionSystem &) = default;
+		//! @brief Default dtor
+		~EndConditionSystem() override = default;
+		//! @brief A SoundManager screen system can't be assigned.
+		EndConditionSystem &operator=(const EndConditionSystem &) = delete;
+	};
+}