fix(ai): damage endermen in rain (#2714)

pumpkin-util/src/biome.rs

@@ -67,7 +67,6 @@ impl TemperatureModifier {
 /// Represents weather information for a biome, including temperature and precipitation.
 #[derive(Clone, Debug)]
 pub struct Weather {
-    #[expect(dead_code)]
     has_precipitation: bool,
     /// Base temperature of the biome.
     temperature: f32,
@@ -136,4 +135,37 @@ impl Weather {
             modified_temperature
         }
     }
+
+    #[must_use]
+    pub fn warm_enough_to_rain(&self, x: i32, y: i32, z: i32, sea_level: i32) -> bool {
+        self.compute_temperature(f64::from(x), y, f64::from(z), sea_level) >= 0.15
+    }
+
+    #[must_use]
+    pub fn is_rain_at(&self, x: i32, y: i32, z: i32, sea_level: i32) -> bool {
+        self.has_precipitation && self.warm_enough_to_rain(x, y, z, sea_level)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{TemperatureModifier, Weather};
+
+    #[test]
+    fn precipitation_controls_rain() {
+        let weather = Weather::new(false, 1.0, TemperatureModifier::None, 0.0);
+        assert!(!weather.is_rain_at(0, 64, 0, 63));
+    }
+
+    #[test]
+    fn warm_precipitation_is_rain() {
+        let weather = Weather::new(true, 1.0, TemperatureModifier::None, 0.0);
+        assert!(weather.is_rain_at(0, 64, 0, 63));
+    }
+
+    #[test]
+    fn cold_precipitation_is_snow() {
+        let weather = Weather::new(true, 0.0, TemperatureModifier::None, 0.0);
+        assert!(!weather.is_rain_at(0, 64, 0, 63));
+    }
 }

pumpkin/src/entity/mob/enderman.rs

@@ -427,8 +427,12 @@ impl Mob for EndermanEntity {
                 return;
             }
 
-            // TODO: also check rain
-            if entity.touching_water.load(Ordering::SeqCst) {
+            let world = entity.world.load();
+            let raining_at_feet = world.is_raining_at(&entity.block_pos.load()).await;
+            let raining_at_head = world
+                .is_raining_at(&entity.bounding_box.load().max_block_pos())
+                .await;
+            if entity.touching_water.load(Ordering::SeqCst) || raining_at_feet || raining_at_head {
                 self.mob_entity
                     .living_entity
                     .damage_with_context(self, 1.0, DamageType::DROWN, None, None, None)

pumpkin/src/world/mod.rs

@@ -162,6 +162,8 @@ use weather::Weather;
 
 type FlowingFluidProperties = pumpkin_data::fluid::FlowingWaterLikeFluidProperties;
 
+const MAX_LIGHT_LEVEL: u8 = 15;
+
 use rustc_hash::{FxHashMap, FxHashSet};
 
 impl PumpkinError for GetBlockError {
@@ -1730,6 +1732,20 @@ impl World {
         self.weather.lock().await.raining
     }
 
+    pub async fn is_raining_at(&self, pos: &BlockPos) -> bool {
+        if !self.is_raining().await {
+            return false;
+        }
+        if self.get_heightmap_height(MotionBlocking, pos.0.x, pos.0.z) + 1 > pos.0.y {
+            return false;
+        }
+        self.can_see_sky(pos)
+            && self
+                .get_biome(pos)
+                .weather
+                .is_rain_at(pos.0.x, pos.0.y, pos.0.z, self.sea_level)
+    }
+
     pub async fn set_raining(&self, raining: bool) {
         let mut weather = self.weather.lock().await;
         if weather.raining != raining {
@@ -4439,6 +4455,13 @@ impl World {
             .get_sky_light_level(&self.level, position)
     }
 
+    #[must_use]
+    pub fn can_see_sky(&self, position: &BlockPos) -> bool {
+        position.0.y >= self.dimension.min_y
+            && position.0.y < self.dimension.min_y + self.dimension.height
+            && self.get_sky_light_level(position) >= MAX_LIGHT_LEVEL
+    }
+
     pub fn set_block_light_level(&self, position: &BlockPos, light_level: u8) {
         let _ = self
             .level