From 818f2d01d49e574946d1a704e1445156afc9c2fb Mon Sep 17 00:00:00 2001
From: ShayBox <shaybox@shaybox.com>
Date: Thu, 30 Oct 2025 12:14:19 -0400
Subject: Add support for mob effects (#269)

* Add support for mob effects

* Remove Option

* MobEffectFlags

* jump_boost_power f32
---
 azalea-entity/src/effects.rs | 83 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 71 insertions(+), 12 deletions(-)

(limited to 'azalea-entity/src/effects.rs')

diff --git a/azalea-entity/src/effects.rs b/azalea-entity/src/effects.rs
index 9cc750e5..d905414d 100644
--- a/azalea-entity/src/effects.rs
+++ b/azalea-entity/src/effects.rs
@@ -1,21 +1,80 @@
-// TODO
+use std::collections::HashMap;
 
-// pub struct ActiveEffects(HashMap<azalea_registry::MobEffect, MobEffectData>);
+use azalea_registry::MobEffect;
+use bevy_ecs::component::Component;
 
-/// Returns the level of the given effect, or `None` if the effect is not
-/// active. The lowest level is 0.
-pub fn get_effect(_effect: azalea_registry::MobEffect) -> Option<u32> {
-    // TODO
-    None
+/// Data about an active mob effect that the client knows about.
+#[derive(Clone, Debug, Default)]
+pub struct MobEffectData {
+    pub amplifier: u32,
+    pub duration_ticks: u32,
+    pub ambient: bool,
+    pub show_particles: bool,
+    pub show_icon: bool,
+}
+impl MobEffectData {
+    pub fn new(
+        amplifier: u32,
+        duration_ticks: u32,
+        ambient: bool,
+        show_particles: bool,
+        show_icon: bool,
+    ) -> Self {
+        Self {
+            amplifier,
+            duration_ticks,
+            ambient,
+            show_particles,
+            show_icon,
+        }
+    }
+
+    pub fn is_ambient(&self) -> bool {
+        self.ambient
+    }
+    pub fn should_show_particles(&self) -> bool {
+        self.show_particles
+    }
+    pub fn should_show_icon(&self) -> bool {
+        self.show_icon
+    }
+}
+
+/// Component storing the active mob effects on an entity.
+#[derive(Component, Clone, Debug, Default)]
+pub struct ActiveEffects(pub HashMap<MobEffect, MobEffectData>);
+impl ActiveEffects {
+    pub fn insert(&mut self, effect: MobEffect, data: MobEffectData) {
+        self.0.insert(effect, data);
+    }
+
+    pub fn remove(&mut self, effect: MobEffect) -> Option<MobEffectData> {
+        self.0.remove(&effect)
+    }
+
+    pub fn get_level(&self, effect: MobEffect) -> Option<u32> {
+        self.0.get(&effect).map(|data| data.amplifier)
+    }
+
+    pub fn get(&self, effect: MobEffect) -> Option<&MobEffectData> {
+        self.0.get(&effect)
+    }
+}
+
+/// Returns the level (amplifier) of the given effect, or `None` if the effect
+/// is not active. The lowest level is 0.
+pub fn get_effect(active_effects: &ActiveEffects, effect: MobEffect) -> Option<u32> {
+    active_effects.get_level(effect)
 }
 
-pub fn get_dig_speed_amplifier() -> Option<u32> {
+/// Returns the amplifier for dig speed (haste / conduit power), if present.
+pub fn get_dig_speed_amplifier(active_effects: &ActiveEffects) -> Option<u32> {
     let effect_plus_one = u32::max(
-        get_effect(azalea_registry::MobEffect::Haste)
-            .map(|x| x + 1)
+        get_effect(active_effects, MobEffect::Haste)
+            .map(|level| level + 1)
             .unwrap_or_default(),
-        get_effect(azalea_registry::MobEffect::ConduitPower)
-            .map(|x| x + 1)
+        get_effect(active_effects, MobEffect::ConduitPower)
+            .map(|level| level + 1)
             .unwrap_or_default(),
     );
     if effect_plus_one > 0 {
-- 
cgit v1.2.3