From 07049889c4b1afc2306ee609dc3b0ff69a92e3f4 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Fri, 11 Nov 2022 16:32:05 +0100
Subject: Hiding away implementation details of battle simulation

---
 battles/src/Battle.cpp | 42 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 35 insertions(+), 7 deletions(-)

(limited to 'battles/src')

diff --git a/battles/src/Battle.cpp b/battles/src/Battle.cpp
index 454cbfd..99ed076 100644
--- a/battles/src/Battle.cpp
+++ b/battles/src/Battle.cpp
@@ -1,7 +1,10 @@
 #include <kurator/battles/Battle.h>
 
+#include <memory>
 #include <random>
 
+#include <entt/entity/registry.hpp>
+
 #include <kurator/battles/components.h>
 #include <kurator/battles/Scenario.h>
 #include <kurator/universe/ShipType.h>
@@ -13,27 +16,52 @@ namespace battles
 {
 
 
-Battle::Battle(Scenario scenario)
+class BaseBattle : public Battle
+{
+public:
+	BaseBattle(const Scenario& scenario);
+	entt::registry& registry() override;
+	void update(float dt) override;
+private:
+	entt::registry _registry;
+};
+
+
+BaseBattle::BaseBattle(const Scenario& scenario)
 {
 	std::random_device dev;
 	std::uniform_real_distribution<> pos{-2.5, 2.5};
 	for (const auto& ship : scenario.ships) {
-		const auto entity = registry.create();
-		registry.emplace<universe::ShipType>(entity, ship.type);
-		registry.emplace<Team>(entity, ship.team);
-		registry.emplace<Transform>(entity, Point{pos(dev), pos(dev)}, Point{0.0, 0.0});
+		const auto entity = _registry.create();
+		_registry.emplace<universe::ShipType>(entity, ship.type);
+		_registry.emplace<Team>(entity, ship.team);
+		_registry.emplace<Transform>(entity, Point{pos(dev), pos(dev)}, Point{0.0, 0.0});
 	}
 }
 
 
+entt::registry&
+BaseBattle::registry()
+{
+	return _registry;
+}
+
+
 void
-Battle::update(const float dt)
+BaseBattle::update(const float dt)
 {
-	auto view = registry.view<Transform, Team>();
+	auto view = _registry.view<Transform, Team>();
 	for (auto&& [entity, transform, team] : view.each())
 		transform.position.x += 0.1 * dt * (team.id * 2 - 1);
 }
 
 
+std::unique_ptr<Battle>
+prepare(const Scenario& scenario)
+{
+	return std::make_unique<BaseBattle>(scenario);
+}
+
+
 }  // namespace battles
 }  // namespace kurator
-- 
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