2 files changed, 73 insertions, 3 deletions

diff --git a/src/openvic-simulation/map/ProvinceInstance.cpp b/src/openvic-simulation/map/ProvinceInstance.cpp
index e85c576..949a2a3 100644
--- a/src/openvic-simulation/map/ProvinceInstance.cpp
+++ b/src/openvic-simulation/map/ProvinceInstance.cpp
@@ -235,6 +235,12 @@ void ProvinceInstance::update_modifier_sum(Date today, StaticModifierCache const
 	modifier_sum.add_modifier_nullcheck(province_definition.get_climate(), province_source);
 
 	modifier_sum.add_modifier_nullcheck(terrain_type, province_source);
+
+	if constexpr (!ADD_OWNER_CONTRIBUTION) {
+		if (owner != nullptr) {
+			owner->contribute_province_modifier_sum(modifier_sum);
+		}
+	}
 }
 
 void ProvinceInstance::contribute_country_modifier_sum(ModifierSum const& owner_modifier_sum) {
@@ -242,11 +248,66 @@ void ProvinceInstance::contribute_country_modifier_sum(ModifierSum const& owner_
 }
 
 fixed_point_t ProvinceInstance::get_modifier_effect_value(ModifierEffect const& effect) const {
-	return modifier_sum.get_effect(effect);
+	if constexpr (ADD_OWNER_CONTRIBUTION) {
+		return modifier_sum.get_effect(effect);
+	} else {
+		using enum ModifierEffect::target_t;
+
+		if (owner != nullptr) {
+			if ((effect.get_targets() & PROVINCE) == NO_TARGETS) {
+				// Non-province targeted effects are already added to the country modifier sum
+				return owner->get_modifier_effect_value(effect);
+			} else {
+				// Province-targeted effects aren't passed to the country modifier sum
+				return owner->get_modifier_effect_value(effect) + modifier_sum.get_effect(effect);
+			}
+		} else {
+			return modifier_sum.get_effect(effect);
+		}
+	}
 }
 
 fixed_point_t ProvinceInstance::get_modifier_effect_value_nullcheck(ModifierEffect const* effect) const {
-	return modifier_sum.get_effect_nullcheck(effect);
+	if (effect != nullptr) {
+		return get_modifier_effect_value(*effect);
+	} else {
+		return fixed_point_t::_0();
+	}
+}
+
+void ProvinceInstance::push_contributing_modifiers(
+	ModifierEffect const& effect, std::vector<ModifierSum::modifier_entry_t>& contributions
+) const {
+	if constexpr (ADD_OWNER_CONTRIBUTION) {
+		modifier_sum.push_contributing_modifiers(effect, contributions);
+	} else {
+		using enum ModifierEffect::target_t;
+
+		if (owner != nullptr) {
+			if ((effect.get_targets() & PROVINCE) == NO_TARGETS) {
+				// Non-province targeted effects are already added to the country modifier sum
+				owner->push_contributing_modifiers(effect, contributions);
+			} else {
+				// Province-targeted effects aren't passed to the country modifier sum
+				modifier_sum.push_contributing_modifiers(effect, contributions);
+				owner->push_contributing_modifiers(effect, contributions);
+			}
+		} else {
+			modifier_sum.push_contributing_modifiers(effect, contributions);
+		}
+	}
+}
+
+std::vector<ModifierSum::modifier_entry_t> ProvinceInstance::get_contributing_modifiers(ModifierEffect const& effect) const {
+	if constexpr (ADD_OWNER_CONTRIBUTION) {
+		return modifier_sum.get_contributing_modifiers(effect);
+	} else {
+		std::vector<ModifierSum::modifier_entry_t> contributions;
+
+		push_contributing_modifiers(effect, contributions);
+
+		return contributions;
+	}
 }
 
 void ProvinceInstance::update_gamestate(Date today, DefineManager const& define_manager) {
diff --git a/src/openvic-simulation/map/ProvinceInstance.hpp b/src/openvic-simulation/map/ProvinceInstance.hpp
index 0b02c41..91e8ee1 100644
--- a/src/openvic-simulation/map/ProvinceInstance.hpp
+++ b/src/openvic-simulation/map/ProvinceInstance.hpp
@@ -69,7 +69,12 @@ namespace OpenVic {
 		CountryInstance* PROPERTY(controller);
 		ordered_set<CountryInstance*> PROPERTY(cores);
 
-		// The total/resultant modifier affecting this province, including owner country contributions.
+	public:
+		static constexpr bool ADD_OWNER_CONTRIBUTION = true;
+
+	private:
+		// The total/resultant modifier affecting this province, including owner country contributions if
+		// ADD_OWNER_CONTRIBUTION is true.
 		ModifierSum PROPERTY(modifier_sum);
 		std::vector<ModifierInstance> PROPERTY(event_modifiers);
 
@@ -133,6 +138,10 @@ namespace OpenVic {
 		void contribute_country_modifier_sum(ModifierSum const& owner_modifier_sum);
 		fixed_point_t get_modifier_effect_value(ModifierEffect const& effect) const;
 		fixed_point_t get_modifier_effect_value_nullcheck(ModifierEffect const* effect) const;
+		void push_contributing_modifiers(
+			ModifierEffect const& effect, std::vector<ModifierSum::modifier_entry_t>& contributions
+		) const;
+		std::vector<ModifierSum::modifier_entry_t> get_contributing_modifiers(ModifierEffect const& effect) const;
 
 		void update_gamestate(Date today, DefineManager const& define_manager);
 		void tick(Date today);