From ec2f951152cd19ce861d9ae19f0bfac67595834c Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sun, 20 Nov 2022 00:54:28 +0100
Subject: Implemented verbose damage modifier based on range

---
 battles/src/BaseBattle.cpp                     | 19 ++++++++++++++++---
 universe/include/kurator/universe/TurretType.h |  4 +++-
 universe/src/SampleRepository.cpp              |  2 +-
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/battles/src/BaseBattle.cpp b/battles/src/BaseBattle.cpp
index e102d79..604a607 100644
--- a/battles/src/BaseBattle.cpp
+++ b/battles/src/BaseBattle.cpp
@@ -1,5 +1,8 @@
 #include "BaseBattle.h"
 
+#include <algorithm>
+#include <cmath>
+
 #include <entt/entity/registry.hpp>
 #include <entt/signal/dispatcher.hpp>
 
@@ -105,6 +108,15 @@ BaseBattle::floating_movement(const float dt)
 }
 
 
+double
+effective_damage(const universe::TurretType& def, const double distance)
+{
+	const auto overflow = distance - def.optimal_range;
+	const auto falloff = std::max(0.0, overflow / def.optimal_range / def.falloff_modifier);
+	return def.base_damage * std::pow(def.falloff_intensity, std::pow(falloff, 2));
+}
+
+
 void
 BaseBattle::turrets(const float dt)
 {
@@ -123,9 +135,10 @@ BaseBattle::turrets(const float dt)
 			auto& target_points = _registry.get<HitPoints>(state.target);
 			const auto& target = _registry.get<Transform>(state.target);
 			const auto distance = transform.position - target.position;
-			if (def.range > distance.magnitude()) {
-				target_points.health -= def.base_damage;
-				_dispatcher.trigger(Hit{def.base_damage, entity, state.target});
+			const auto damage = effective_damage(def, distance.magnitude());
+			if (damage > 0.0) {
+				target_points.health -= damage;
+				_dispatcher.trigger(Hit{damage, entity, state.target});
 			}
 			control.reload = def.rate_of_fire;
 		}
diff --git a/universe/include/kurator/universe/TurretType.h b/universe/include/kurator/universe/TurretType.h
index b3a6eb2..7723d88 100644
--- a/universe/include/kurator/universe/TurretType.h
+++ b/universe/include/kurator/universe/TurretType.h
@@ -14,7 +14,9 @@ struct TurretType
 	std::string name;
 	double base_damage;
 	double rate_of_fire;
-	double range;
+	double optimal_range;
+	double falloff_modifier;
+	double falloff_intensity;
 };
 
 
diff --git a/universe/src/SampleRepository.cpp b/universe/src/SampleRepository.cpp
index 1d875e7..2886e3d 100644
--- a/universe/src/SampleRepository.cpp
+++ b/universe/src/SampleRepository.cpp
@@ -23,7 +23,7 @@ static const std::unordered_map<std::string, ShipType> ships {
 
 
 static const std::unordered_map<std::string, TurretType> turrets {
-	{"cannon", {"Cannon", 1.0, 1.0, 1.2}},
+	{"cannon", {"Cannon", 1.0, 1.0, 1.5, 0.5, 0.2}},
 };
 
 
-- 
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