10 files changed, 120 insertions, 37 deletions
diff --git a/sim/CMakeLists.txt b/sim/CMakeLists.txt
index 55dcc60..a221d2f 100644
--- a/sim/CMakeLists.txt
+++ b/sim/CMakeLists.txt
@@ -2,6 +2,7 @@ project(sim)
 add_library(
 	${PROJECT_NAME} STATIC
 	src/BaseBattle.cpp
+	src/BaseSimulation.cpp
 	src/Battle.cpp
 	src/Builder.cpp
 	src/FloatingMovement.cpp
diff --git a/sim/include/kurator/sim.h b/sim/include/kurator/sim.h
index 3c4364c..3330c48 100644
--- a/sim/include/kurator/sim.h
+++ b/sim/include/kurator/sim.h
@@ -3,6 +3,7 @@
 #include <kurator/campaign/Scenario.h>
 
 #include "sim/State.h"
+#include "sim/System.h"
 
 
 namespace kurator
@@ -11,7 +12,8 @@ namespace sim
 {
 
 
-void load_scenario(State& ctx, const campaign::Scenario& scenario);
+auto load_scenario(const campaign::Scenario& scenario) -> State;
+auto base_simulation_systems(State& ctx) -> System;
 
 
 }  // namespace sim
diff --git a/sim/include/kurator/sim/System.h b/sim/include/kurator/sim/System.h
new file mode 100644
index 0000000..101812a
--- /dev/null
+++ b/sim/include/kurator/sim/System.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <functional>
+
+#include <kurator/engine/Context.h>
+
+
+namespace kurator
+{
+namespace sim
+{
+
+
+using System = std::function<void(engine::Context&)>;
+
+
+}  // namespace sim
+}  // namespace kurator
diff --git a/sim/src/BaseBattle.cpp b/sim/src/BaseBattle.cpp
index 916a9f8..ee09740 100644
--- a/sim/src/BaseBattle.cpp
+++ b/sim/src/BaseBattle.cpp
@@ -1,21 +1,11 @@
 #include "BaseBattle.h"
 
-#include <algorithm>
-
 #include <entt/entity/registry.hpp>
 #include <entt/signal/dispatcher.hpp>
 
 #include <kurator/engine/Context.h>
 #include <kurator/campaign/Scenario.h>
 #include <kurator/sim.h>
-#include <kurator/sim/components.h>
-#include <kurator/sim/FloatingMovement.h>
-#include <kurator/sim/systems.h>
-#include <kurator/sim/TurretControl.h>
-#include <kurator/universe/UniqueIdentifier.h>
-
-#include "Builder.h"
-#include "RandomSpawner.h"
 
 
 namespace kurator
@@ -24,10 +14,10 @@ namespace sim
 {
 
 
-BaseBattle::BaseBattle(const campaign::Scenario& scenario)
+BaseBattle::BaseBattle(const campaign::Scenario& scenario) :
+	state {load_scenario(scenario)},
+	base {base_simulation_systems(state)}
 {
-	load_scenario(state, scenario);
-	manager.extend(state.registry);
 }
 
 
@@ -48,23 +38,7 @@ BaseBattle::const_context() const
 void
 BaseBattle::update(engine::Context& ctx)
 {
-	pick_random_targets();
-	keep_at_range(ctx);
-	FloatingMovement::update(ctx);
-	TurretControl::update(ctx);
-	kill_off_dead(ctx);
-	manager.update(ctx);
-}
-
-
-void
-BaseBattle::pick_random_targets()
-{
-	auto view = state.registry.view<Team, AIState>();
-	for (auto&& [entity, team, ai] : view.each()) {
-		if (!state.registry.valid(ai.target))
-			ai.target = manager.random(team.id);
-	}
+	base(ctx);
 }
 
 
diff --git a/sim/src/BaseBattle.h b/sim/src/BaseBattle.h
index 6f59457..3e98658 100644
--- a/sim/src/BaseBattle.h
+++ b/sim/src/BaseBattle.h
@@ -4,6 +4,7 @@
 #include <kurator/campaign/Scenario.h>
 #include <kurator/sim/Battle.h>
 #include <kurator/sim/State.h>
+#include <kurator/sim/System.h>
 
 #include "TeamManager.h"
 
@@ -17,14 +18,13 @@ namespace sim
 class BaseBattle : public Battle
 {
 public:
-	BaseBattle(const campaign::Scenario& scenario);
+	explicit BaseBattle(const campaign::Scenario& scenario);
 	engine::Context context() override;
 	engine::ConstContext const_context() const override;
 	void update(engine::Context& ctx) override;
 private:
 	State state;
-	TeamManager manager;
-	void pick_random_targets();
+	System base;
 };
 
 
diff --git a/sim/src/BaseSimulation.cpp b/sim/src/BaseSimulation.cpp
new file mode 100644
index 0000000..05b224d
--- /dev/null
+++ b/sim/src/BaseSimulation.cpp
@@ -0,0 +1,37 @@
+#include "BaseSimulation.h"
+
+#include <kurator/engine/Context.h>
+#include <kurator/sim/State.h>
+#include <kurator/sim/FloatingMovement.h>
+#include <kurator/sim/TurretControl.h>
+
+#include "systems.h"
+#include "TeamManager.h"
+
+
+namespace kurator
+{
+namespace sim
+{
+
+
+BaseSimulation::BaseSimulation(State& ctx)
+{
+	manager.extend(ctx.registry);
+}
+
+
+void
+BaseSimulation::operator()(engine::Context& ctx)
+{
+	pick_random_targets(ctx, manager);
+	keep_at_range(ctx);
+	FloatingMovement::update(ctx);
+	TurretControl::update(ctx);
+	kill_off_dead(ctx);
+	manager.update(ctx);
+}
+
+
+}  // namespace sim
+}  // namespace kurator
diff --git a/sim/src/BaseSimulation.h b/sim/src/BaseSimulation.h
new file mode 100644
index 0000000..4d73382
--- /dev/null
+++ b/sim/src/BaseSimulation.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <kurator/engine/Context.h>
+#include <kurator/sim/State.h>
+
+#include "TeamManager.h"
+
+
+namespace kurator
+{
+namespace sim
+{
+
+
+class BaseSimulation
+{
+public:
+	explicit BaseSimulation(State& ctx);
+	void operator()(engine::Context& ctx);
+private:
+	TeamManager manager;
+};
+
+
+}  // namespace sim
+}  // namespace kurator
diff --git a/sim/src/sim.cpp b/sim/src/sim.cpp
index f915d20..4cb7467 100644
--- a/sim/src/sim.cpp
+++ b/sim/src/sim.cpp
@@ -3,8 +3,10 @@
 #include <kurator/campaign/Scenario.h>
 #include <kurator/sim/components.h>
 #include <kurator/sim/State.h>
+#include <kurator/sim/System.h>
 #include <kurator/universe/UniqueIdentifier.h>
 
+#include "BaseSimulation.h"
 #include "Builder.h"
 #include "RandomSpawner.h"
 
@@ -15,9 +17,10 @@ namespace sim
 {
 
 
-void
-load_scenario(State& ctx, const campaign::Scenario& scenario)
+State
+load_scenario(const campaign::Scenario& scenario)
 {
+	State ctx {};
 	RandomSpawner spawner {scenario.last_team(), scenario.radius, 0.1};
 	Builder build {ctx.registry, spawner};
 	for (const auto& ship : scenario.ships) {
@@ -29,6 +32,14 @@ load_scenario(State& ctx, const campaign::Scenario& scenario)
 			state.keep_at_range = std::min(state.keep_at_range, turret_type.optimal_range);
 		}
 	}
+	return ctx;
+}
+
+
+System
+base_simulation_systems(State& ctx)
+{
+	return BaseSimulation{ctx};
 }
 
 
diff --git a/sim/src/systems.cpp b/sim/src/systems.cpp
index 114ed2f..4dc1e71 100644
--- a/sim/src/systems.cpp
+++ b/sim/src/systems.cpp
@@ -1,4 +1,4 @@
-#include <kurator/sim/systems.h>
+#include "systems.h"
 
 #include <kurator/engine/Context.h>
 #include <kurator/sim/components.h>
@@ -15,6 +15,17 @@ namespace sim
 
 
 void
+pick_random_targets(engine::Context& ctx, TeamManager& manager)
+{
+	auto view = ctx.registry.view<Team, AIState>();
+	for (auto&& [entity, team, ai] : view.each()) {
+		if (!ctx.registry.valid(ai.target))
+			ai.target = manager.random(team.id);
+	}
+}
+
+
+void
 keep_at_range(engine::Context& ctx)
 {
 	auto view = ctx.registry.view<Transform, AIState>();
diff --git a/sim/include/kurator/sim/systems.h b/sim/src/systems.h
index 76353c2..4c8838b 100644
--- a/sim/include/kurator/sim/systems.h
+++ b/sim/src/systems.h
@@ -2,6 +2,8 @@
 
 #include <kurator/engine/Context.h>
 
+#include "TeamManager.h"
+
 
 namespace kurator
 {
@@ -9,6 +11,7 @@ namespace sim
 {
 
 
+void pick_random_targets(engine::Context& ctx, TeamManager& manager);
 void keep_at_range(engine::Context& ctx);
 void kill_off_dead(engine::Context& ctx);