fix: slimes

pumpkin-util/src/random/mod.rs

@@ -144,6 +144,30 @@ pub fn get_region_seed(world_seed: u64, region_x: i32, region_z: i32, salt: u32)
         .wrapping_add(i64::from(salt) as u64)
 }
 
+/// Generates a seed for slime chunk determination.
+///
+/// This follows Minecraft's specific formula for identifying if a chunk
+/// is a "slime chunk" where slimes can spawn regardless of light levels.
+///
+/// # Arguments
+/// - `x` – The X chunk coordinate.
+/// - `z` – The Z chunk coordinate.
+/// - `seed` – The world seed.
+/// - `salt` – A salt value (default is 987234911).
+///
+/// # Returns
+/// A seed value to be used with a legacy random generator.
+#[inline]
+#[must_use]
+pub fn seed_slime_chunk(x: i32, z: i32, seed: u64, salt: u64) -> u64 {
+    (seed
+        .wrapping_add((x.wrapping_mul(x).wrapping_mul(4_987_142)) as i64 as u64)
+        .wrapping_add((x.wrapping_mul(5_947_611)) as i64 as u64)
+        .wrapping_add((z.wrapping_mul(z) as i64).wrapping_mul(4_392_871) as u64)
+        .wrapping_add((z.wrapping_mul(389_711)) as i64 as u64))
+        ^ salt
+}
+
 /// Generates a carver seed for cave and ravine generation.
 ///
 /// Carver seeds are used for terrain carving features like caves and ravines.

pumpkin-util/src/text/mod.rs

@@ -288,6 +288,25 @@ impl TextComponentBase {
     pub fn to_translated(self) -> Self {
         // NOTE: Divide the translation into slices and inserts the substitutions.
         let component = match *self.content {
+            TextContent::Translate {
+                translate,
+                bedrock_translate,
+                with,
+            } => {
+                let mut translated_with = vec![];
+                for w in with {
+                    translated_with.push(w.to_translated());
+                }
+                Self {
+                    content: Box::new(TextContent::Translate {
+                        translate,
+                        bedrock_translate,
+                        with: translated_with,
+                    }),
+                    style: self.style,
+                    extra: self.extra,
+                }
+            }
             TextContent::Custom { key, with, locale } => {
                 let translation = get_translation(&key, locale);
                 let mut translation_parent = translation.clone();

pumpkin/src/entity/ai/control/mod.rs

@@ -1,6 +1,8 @@
+use crate::entity::mob::Mob;
 use pumpkin_util::math::subtract_angles;
 
 pub mod look_control;
+pub mod move_control;
 
 pub trait Control: Send + Sync {
     fn change_angle(&self, start: f32, end: f32, max_change: f32) -> f32 {
@@ -9,3 +11,7 @@ pub trait Control: Send + Sync {
         start + j
     }
 }
+
+pub trait MoveControlTrait: Control {
+    fn tick(&mut self, mob: &dyn Mob);
+}

pumpkin/src/entity/ai/control/move_control.rs

@@ -0,0 +1,148 @@
+use crate::entity::ai::control::{Control, MoveControlTrait};
+use crate::entity::mob::Mob;
+use pumpkin_data::attributes::Attributes;
+use pumpkin_util::math::vector3::Vector3;
+use std::sync::atomic::Ordering;
+
+#[derive(Default, Clone, Copy, PartialEq, Eq)]
+pub enum Operation {
+    #[default]
+    Wait,
+    MoveTo,
+    Strafe,
+    Jumping,
+}
+
+pub struct MoveControl {
+    pub wanted_x: f64,
+    pub wanted_y: f64,
+    pub wanted_z: f64,
+    pub speed_modifier: f64,
+    pub strafe_forwards: f32,
+    pub strafe_right: f32,
+    pub operation: Operation,
+}
+
+impl Default for MoveControl {
+    fn default() -> Self {
+        Self {
+            wanted_x: 0.0,
+            wanted_y: 0.0,
+            wanted_z: 0.0,
+            speed_modifier: 0.0,
+            strafe_forwards: 0.0,
+            strafe_right: 0.0,
+            operation: Operation::Wait,
+        }
+    }
+}
+
+impl Control for MoveControl {}
+
+impl MoveControlTrait for MoveControl {
+    fn tick(&mut self, mob: &dyn Mob) {
+        let mob_entity = mob.get_mob_entity();
+        let living_entity = &mob_entity.living_entity;
+        let entity = &living_entity.entity;
+
+        if self.operation == Operation::Strafe {
+            let movement_speed = living_entity.get_attribute_value(&Attributes::MOVEMENT_SPEED);
+            let speed_modified = (self.speed_modifier * movement_speed) as f32;
+            let xa = self.strafe_forwards;
+            let za = self.strafe_right;
+            let mut dist = xa.hypot(za);
+            if dist < 1.0 {
+                dist = 1.0;
+            }
+
+            let dist_norm = speed_modified / dist;
+            let _xa_norm = xa * dist_norm;
+            let _za_norm = za * dist_norm;
+
+            // TODO: is_walkable check
+
+            living_entity.movement_input.store(Vector3::new(
+                self.strafe_right as f64,
+                0.0,
+                self.strafe_forwards as f64,
+            ));
+            // Vanilla sets speed here too
+            self.operation = Operation::Wait;
+        } else if self.operation == Operation::MoveTo {
+            self.operation = Operation::Wait;
+            let pos = entity.pos.load();
+            let xd = self.wanted_x - pos.x;
+            let zd = self.wanted_z - pos.z;
+            let yd = self.wanted_y - pos.y;
+            let dd = xd * xd + yd * yd + zd * zd;
+
+            if dd < 2.5000003E-7 {
+                living_entity
+                    .movement_input
+                    .store(Vector3::new(0.0, 0.0, 0.0));
+                return;
+            }
+
+            let y_rot_d = (zd.atan2(xd).to_degrees() as f32) - 90.0;
+            entity
+                .yaw
+                .store(self.change_angle(entity.yaw.load(), y_rot_d, 90.0));
+
+            let movement_speed = living_entity.get_attribute_value(&Attributes::MOVEMENT_SPEED);
+            let speed = self.speed_modifier * movement_speed;
+            living_entity
+                .movement_input
+                .store(Vector3::new(0.0, 0.0, speed));
+
+            // TODO: Jump if needed (based on collision and height difference)
+            let step_height = living_entity.get_attribute_value(&Attributes::STEP_HEIGHT);
+            if yd > step_height
+                && xd * xd + zd * zd < 1.0f64.max(entity.entity_dimension.load().width as f64)
+            {
+                living_entity.jumping.store(true, Ordering::SeqCst);
+                self.operation = Operation::Jumping;
+            }
+        } else if self.operation == Operation::Jumping {
+            let movement_speed = living_entity.get_attribute_value(&Attributes::MOVEMENT_SPEED);
+            let speed = self.speed_modifier * movement_speed;
+            living_entity
+                .movement_input
+                .store(Vector3::new(0.0, 0.0, speed));
+
+            if entity.on_ground.load(Ordering::Relaxed) {
+                self.operation = Operation::Wait;
+            }
+        } else {
+            living_entity
+                .movement_input
+                .store(Vector3::new(0.0, 0.0, 0.0));
+        }
+    }
+}
+
+impl MoveControl {
+    pub fn has_wanted(&self) -> bool {
+        self.operation == Operation::MoveTo
+    }
+
+    pub fn get_speed_modifier(&self) -> f64 {
+        self.speed_modifier
+    }
+
+    pub fn set_wanted_position(&mut self, x: f64, y: f64, z: f64, speed_modifier: f64) {
+        self.wanted_x = x;
+        self.wanted_y = y;
+        self.wanted_z = z;
+        self.speed_modifier = speed_modifier;
+        if self.operation != Operation::Jumping {
+            self.operation = Operation::MoveTo;
+        }
+    }
+
+    pub fn strafe(&mut self, forwards: f32, right: f32) {
+        self.operation = Operation::Strafe;
+        self.strafe_forwards = forwards;
+        self.strafe_right = right;
+        self.speed_modifier = 0.25;
+    }
+}

pumpkin/src/entity/ai/goal/active_target.rs

@@ -9,6 +9,7 @@ use crate::world::World;
 use pumpkin_data::attributes::Attributes;
 use pumpkin_data::entity::EntityType;
 use rand::RngExt;
+use std::future::Future;
 use std::sync::Arc;
 
 const DEFAULT_RECIPROCAL_CHANCE: i32 = 10;
@@ -39,9 +40,11 @@ impl ActiveTargetGoal {
         target_predicate.base_max_distance = mob
             .living_entity
             .get_attribute_value(&Attributes::FOLLOW_RANGE);
+
         if let Some(predicate) = predicate {
             target_predicate.set_predicate(predicate);
         }
+
         Self {
             track_target_goal,
             target: None,
@@ -62,6 +65,7 @@ impl ActiveTargetGoal {
         target_predicate.base_max_distance = mob
             .living_entity
             .get_attribute_value(&Attributes::FOLLOW_RANGE);
+
         Box::new(Self {
             track_target_goal,
             target: None,
@@ -71,16 +75,29 @@ impl ActiveTargetGoal {
         })
     }
 
+    pub fn set_target(&mut self, target: Option<Arc<dyn EntityBase>>) {
+        self.target = target;
+    }
+
     fn find_closest_target(&mut self, mob: &MobEntity) {
+        let follow_range = mob
+            .living_entity
+            .get_attribute_value(&Attributes::FOLLOW_RANGE);
+
+        // Vanilla updates the target conditions with the current follow distance on every search
+        self.target_predicate.base_max_distance = follow_range;
+
         let world = mob.living_entity.entity.world.load();
+
+        // Vanilla searches using getEyeY(), so we offset the position by the eye height
+        let mut search_pos = mob.living_entity.entity.pos.load();
+        search_pos.y += mob.living_entity.entity.entity_dimension.load().eye_height as f64;
+
         if self.target_type == &EntityType::PLAYER {
             let potential_player = world
-                .get_closest_player(
-                    mob.living_entity.entity.pos.load(),
-                    mob.living_entity
-                        .get_attribute_value(&Attributes::FOLLOW_RANGE),
-                )
+                .get_closest_player(search_pos, follow_range)
                 .map(|p: Arc<Player>| p as Arc<dyn EntityBase>);
+
             if let Some(potential_entity) = potential_player
                 && let Some(living) = potential_entity.get_living_entity()
                 && self
@@ -91,12 +108,9 @@ impl ActiveTargetGoal {
                 return;
             }
         } else {
-            let potential_entity = world.get_closest_entity(
-                mob.living_entity.entity.pos.load(),
-                mob.living_entity
-                    .get_attribute_value(&Attributes::FOLLOW_RANGE),
-                Some(&[self.target_type]),
-            );
+            let potential_entity =
+                world.get_closest_entity(search_pos, follow_range, Some(&[self.target_type]));
+
             if let Some(potential_entity) = potential_entity
                 && let Some(living) = potential_entity.get_living_entity()
                 && self
@@ -123,6 +137,7 @@ impl Goal for ActiveTargetGoal {
             self.target.is_some()
         })
     }
+
     fn should_continue<'a>(&'a self, mob: &'a dyn Mob) -> GoalFuture<'a, bool> {
         Box::pin(async { self.track_target_goal.should_continue(mob).await })
     }
@@ -130,7 +145,6 @@ impl Goal for ActiveTargetGoal {
     fn start<'a>(&'a mut self, mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
         Box::pin(async {
             mob.set_mob_target(self.target.clone()).await;
-
             self.track_target_goal.start(mob).await;
         })
     }

pumpkin/src/entity/ai/goal/track_target.rs

@@ -5,19 +5,19 @@ use crate::entity::living::LivingEntity;
 use crate::entity::mob::Mob;
 use pumpkin_data::attributes::Attributes;
 use rand::RngExt;
+use std::sync::atomic::{AtomicI32, Ordering};
 
 const UNSET: i32 = 0;
 const CAN_TRACK: i32 = 1;
 const CANNOT_TRACK: i32 = 2;
 
-#[expect(dead_code)]
 pub struct TrackTargetGoal {
     goal_control: Controls,
     check_visibility: bool,
     check_can_navigate: bool,
-    can_navigate_flag: i32,
-    check_can_navigate_cooldown: i32,
-    time_without_visibility: i32,
+    can_navigate_flag: AtomicI32,
+    check_can_navigate_cooldown: AtomicI32,
+    time_without_visibility: AtomicI32,
     pub max_time_without_visibility: i32,
     target_predicate: TargetPredicate,
 }
@@ -30,9 +30,9 @@ impl TrackTargetGoal {
             goal_control: Controls::TARGET,
             check_visibility,
             check_can_navigate,
-            can_navigate_flag: UNSET,
-            check_can_navigate_cooldown: 0,
-            time_without_visibility: 0,
+            can_navigate_flag: AtomicI32::new(UNSET),
+            check_can_navigate_cooldown: AtomicI32::new(0),
+            time_without_visibility: AtomicI32::new(0),
             max_time_without_visibility: 60,
             target_predicate: TargetPredicate::create_attackable(),
         }
@@ -42,45 +42,57 @@ impl TrackTargetGoal {
         Self::new(check_visibility, false)
     }
 
-    fn can_navigate_to_entity(&mut self, mob: &dyn Mob, _target: &LivingEntity) -> bool {
-        self.check_can_navigate_cooldown = to_goal_ticks(10 + mob.get_random().random_range(0..5));
+    pub fn set_unseen_memory_ticks(mut self, ticks: i32) -> Self {
+        self.max_time_without_visibility = ticks;
+        self
+    }
+
+    fn can_navigate_to_entity(&self, mob: &dyn Mob, _target: &LivingEntity) -> bool {
+        let cooldown = to_goal_ticks(10 + mob.get_random().random_range(0..5));
+        self.check_can_navigate_cooldown
+            .store(cooldown, Ordering::Relaxed);
         // TODO: after implementing path
         false
     }
 
+    /// Equivalent to Vanilla's `canAttack` check inside `TargetGoal`
     pub fn can_track(
-        &mut self,
+        &self,
         mob: &dyn Mob,
         target: Option<&LivingEntity>,
         target_predicate: &TargetPredicate,
     ) -> bool {
-        if target.is_none() {
+        let Some(target) = target else {
             return false;
-        }
+        };
+
         let mob_entity = mob.get_mob_entity();
-        let target = target.unwrap();
-        let world = mob_entity.living_entity.entity.world.load_full();
+        let world = mob_entity.living_entity.entity.world.load();
+
         if !target_predicate.test(&world, Some(&mob_entity.living_entity), target) {
             return false;
         }
-        // TODO: isInPositionTargetRange check
+
+        // TODO: isInPositionTargetRange (isWithinHome in Java) check
 
         if self.check_can_navigate {
-            self.check_can_navigate_cooldown -= 1;
-            if self.check_can_navigate_cooldown <= 0 {
-                self.can_navigate_flag = UNSET;
+            let cooldown = self
+                .check_can_navigate_cooldown
+                .fetch_sub(1, Ordering::Relaxed)
+                - 1;
+            if cooldown <= 0 {
+                self.can_navigate_flag.store(UNSET, Ordering::Relaxed);
             }
 
-            if self.can_navigate_flag == UNSET {
-                let value = if self.can_navigate_to_entity(mob, target) {
-                    CAN_TRACK
-                } else {
-                    CANNOT_TRACK
-                };
-                self.can_navigate_flag = value;
+            if self.can_navigate_flag.load(Ordering::Relaxed) == UNSET {
+                let can_reach = self.can_navigate_to_entity(mob, target);
+                self.can_navigate_flag.store(
+                    if can_reach { CAN_TRACK } else { CANNOT_TRACK },
+                    Ordering::Relaxed,
+                );
             }
 
-            if self.can_navigate_flag == CANNOT_TRACK {
+            if self.can_navigate_flag.load(Ordering::Relaxed) == CANNOT_TRACK {
                 return false;
             }
         }
@@ -107,6 +119,12 @@ impl Goal for TrackTargetGoal {
                 return false;
             }
 
+            if !self.can_track(mob, Some(target), &self.target_predicate) {
+                return false;
+            }
+
+            // TODO: Team checks (return false if on the same team)
+
             let dist_sq = mob_entity
                 .living_entity
                 .entity
@@ -118,21 +136,36 @@ impl Goal for TrackTargetGoal {
             let follow_range = mob_entity
                 .living_entity
                 .get_attribute_value(&Attributes::FOLLOW_RANGE);
+
             if dist_sq > follow_range * follow_range {
                 return false;
             }
 
-            // TODO: Visibility timeout (check_visibility flag)
+            if self.check_visibility {
+                // TODO: mob.getSensing().hasLineOfSight(target)
+                let has_line_of_sight = true;
 
+                if has_line_of_sight {
+                    self.time_without_visibility.store(0, Ordering::Relaxed);
+                } else {
+                    let unseen_ticks =
+                        self.time_without_visibility.fetch_add(1, Ordering::Relaxed) + 1;
+                    if unseen_ticks > to_goal_ticks(self.max_time_without_visibility) {
+                        return false;
+                    }
+                }
+            }
+
+            mob.set_mob_target(Some(target_base.clone())).await;
             true
         })
     }
 
     fn start<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
         Box::pin(async {
-            self.can_navigate_flag = 0;
-            self.check_can_navigate_cooldown = 0;
-            self.time_without_visibility = 0;
+            self.can_navigate_flag.store(UNSET, Ordering::Relaxed);
+            self.check_can_navigate_cooldown.store(0, Ordering::Relaxed);
+            self.time_without_visibility.store(0, Ordering::Relaxed);
         })
     }
 

pumpkin/src/entity/mob/magma_cube.rs

@@ -22,4 +22,22 @@ impl Mob for MagmaCubeEntity {
     fn get_mob_entity(&self) -> &MobEntity {
         self.slime.get_mob_entity()
     }
+
+    fn mob_tick<'a>(
+        &'a self,
+        caller: &'a Arc<dyn crate::entity::EntityBase>,
+    ) -> crate::entity::EntityBaseFuture<'a, ()> {
+        self.slime.mob_tick(caller)
+    }
+
+    fn post_tick(&self) -> crate::entity::EntityBaseFuture<'_, ()> {
+        self.slime.post_tick()
+    }
+
+    fn mob_player_collision<'a>(
+        &'a self,
+        player: &'a Arc<crate::entity::player::Player>,
+    ) -> crate::entity::EntityBaseFuture<'a, ()> {
+        self.slime.mob_player_collision(player)
+    }
 }

pumpkin/src/entity/mob/mod.rs

@@ -1,6 +1,8 @@
 use super::{Entity, EntityBase, NBTStorage, ai::pathfinder::Navigator, living::LivingEntity};
 use crate::entity::EntityBaseFuture;
+use crate::entity::ai::control::MoveControlTrait;
 use crate::entity::ai::control::look_control::LookControl;
+use crate::entity::ai::control::move_control::MoveControl;
 use crate::entity::ai::goal::goal_selector::GoalSelector;
 use crate::entity::player::Player;
 use crate::server::Server;
@@ -68,6 +70,7 @@ pub struct MobEntity {
     pub navigator: std::sync::Mutex<Navigator>,
     pub target: tokio::sync::Mutex<Option<Arc<dyn EntityBase>>>,
     pub look_control: std::sync::Mutex<LookControl>,
+    pub move_control: std::sync::Mutex<Box<dyn MoveControlTrait>>,
     pub position_target: AtomicCell<BlockPos>,
     pub position_target_range: AtomicI32,
     pub love_ticks: AtomicI32,
@@ -90,9 +93,7 @@ const NIGHT_START: i64 = 12542;
 const NIGHT_END: i64 = 23459;
 
 impl MobEntity {
-    #[expect(dead_code)]
     const AI_DISABLED_FLAG: u8 = 1;
-    #[expect(dead_code)]
     const LEFT_HANDED_FLAG: u8 = 2;
     const ATTACKING_FLAG: u8 = 4;
 
@@ -105,6 +106,7 @@ impl MobEntity {
             navigator: std::sync::Mutex::new(Navigator::default()),
             target: tokio::sync::Mutex::new(None),
             look_control: std::sync::Mutex::new(LookControl::default()),
+            move_control: std::sync::Mutex::new(Box::new(MoveControl::default())),
             position_target: AtomicCell::new(BlockPos::ZERO),
             position_target_range: AtomicI32::new(-1),
             love_ticks: AtomicI32::new(0),
@@ -135,6 +137,26 @@ impl MobEntity {
         self.set_mob_flag(Self::ATTACKING_FLAG, attacking);
     }
 
+    pub fn is_attacking(&self) -> bool {
+        (self.mob_flags.load(Relaxed) & Self::ATTACKING_FLAG) != 0
+    }
+
+    pub fn set_left_handed(&self, left_handed: bool) {
+        self.set_mob_flag(Self::LEFT_HANDED_FLAG, left_handed);
+    }
+
+    pub fn is_left_handed(&self) -> bool {
+        (self.mob_flags.load(Relaxed) & Self::LEFT_HANDED_FLAG) != 0
+    }
+
+    pub fn set_no_ai(&self, no_ai: bool) {
+        self.set_mob_flag(Self::AI_DISABLED_FLAG, no_ai);
+    }
+
+    pub fn is_no_ai(&self) -> bool {
+        (self.mob_flags.load(Relaxed) & Self::AI_DISABLED_FLAG) != 0
+    }
+
     fn set_mob_flag(&self, flag: u8, value: bool) {
         let old_b = self.mob_flags.load(Ordering::Relaxed);
 
@@ -178,22 +200,19 @@ impl MobEntity {
 
         let target_hitbox = target.get_entity().bounding_box.load();
 
-        let attack_box_max = self.get_attack_box(max_range).await;
-
-        let intersects_max = attack_box_max.intersects(&target_hitbox);
-
-        if !intersects_max {
+        if !self
+            .get_attack_box(max_range)
+            .await
+            .intersects(&target_hitbox)
+        {
             return false;
         }
 
-        if min_range > 0.0 {
-            let attack_box_min = self.get_attack_box(min_range).await;
-            if attack_box_min.intersects(&target_hitbox) {
-                return false;
-            }
-        }
-
-        true
+        min_range <= 0.0
+            || !self
+                .get_attack_box(min_range)
+                .await
+                .intersects(&target_hitbox)
     }
 
     pub fn is_dark_enough_to_spawn(world: &World, pos: &BlockPos, is_thundering: bool) -> bool {
@@ -445,6 +464,10 @@ pub trait Mob: EntityBase + Send + Sync {
         Box::pin(async { false })
     }
 
+    fn mob_player_collision<'a>(&'a self, _player: &'a Arc<Player>) -> EntityBaseFuture<'a, ()> {
+        Box::pin(async {})
+    }
+
     fn get_owner_uuid(&self) -> Option<Uuid> {
         None
     }
@@ -517,12 +540,17 @@ impl<T: Mob + Send + 'static> EntityBase for T {
                 *mob_entity.navigator.lock().unwrap() = navigator;
             };
 
-            // Look Control is synchronous, so we can just use a normal block
+            // Controllers are synchronous, so we can just use normal blocks
             {
                 let mut look_control = mob_entity.look_control.lock().unwrap();
                 look_control.tick(self);
             };
 
+            {
+                let mut move_control = mob_entity.move_control.lock().unwrap();
+                move_control.tick(self);
+            };
+
             mob_entity.living_entity.tick(caller, server).await;
             self.post_tick().await;
 
@@ -608,6 +636,10 @@ impl<T: Mob + Send + 'static> EntityBase for T {
         Box::pin(async move { self.mob_interact(player, item_stack).await })
     }
 
+    fn on_player_collision<'a>(&'a self, player: &'a Arc<Player>) -> EntityBaseFuture<'a, ()> {
+        Box::pin(async move { self.mob_player_collision(player).await })
+    }
+
     fn get_entity(&self) -> &Entity {
         &self.get_mob_entity().living_entity.entity
     }

pumpkin/src/entity/mob/slime.rs

@@ -1,21 +1,38 @@
-use std::sync::atomic::Ordering;
+use std::sync::atomic::{AtomicBool, AtomicI32, Ordering};
 use std::sync::{Arc, Weak};
 
+use crossbeam::atomic::AtomicCell;
+use pumpkin_data::attributes::Attributes;
 use pumpkin_data::entity::EntityType;
-use pumpkin_data::sound::Sound;
+use pumpkin_data::sound::{Sound, SoundCategory};
+use pumpkin_data::tag::Taggable;
 use pumpkin_nbt::compound::NbtCompound;
+use pumpkin_util::Difficulty;
+use pumpkin_util::math::boundingbox::{BoundingBox, EntityDimensions};
+use pumpkin_util::math::position::BlockPos;
+use pumpkin_util::math::vector3::Vector3;
 
 use crate::entity::{
-    Entity, NBTStorage, NbtFuture,
-    ai::goal::{
-        active_target::ActiveTargetGoal, look_around::RandomLookAroundGoal,
-        look_at_entity::LookAtEntityGoal, swim::SwimGoal, wander_around::WanderAroundGoal,
-    },
+    Entity, EntityBase, NBTStorage, NbtFuture,
+    ai::control::{Control, MoveControlTrait},
+    ai::goal::{Goal, GoalFuture, active_target::ActiveTargetGoal},
     mob::{Mob, MobEntity},
 };
+use crate::world::World;
+use pumpkin_util::random::RandomImpl;
+use rand::RngExt;
 
 pub struct SlimeEntity {
     entity: Arc<MobEntity>,
+    jump_delay: AtomicI32,
+    target_yaw: AtomicCell<f32>,
+    is_aggressive: AtomicBool,
+    was_on_ground: AtomicBool,
+    pub squish: AtomicCell<f32>,
+    pub target_squish: AtomicCell<f32>,
+    pub o_squish: AtomicCell<f32>,
+    speed_modifier: AtomicCell<f64>,
+    has_split: AtomicBool,
 }
 
 impl SlimeEntity {
@@ -23,34 +40,164 @@ impl SlimeEntity {
         let mob_entity = MobEntity::new(entity);
         let slime = Self {
             entity: Arc::new(mob_entity),
+            jump_delay: AtomicI32::new(0),
+            target_yaw: AtomicCell::new(0.0),
+            is_aggressive: AtomicBool::new(false),
+            was_on_ground: AtomicBool::new(false),
+            squish: AtomicCell::new(0.0),
+            target_squish: AtomicCell::new(0.0),
+            o_squish: AtomicCell::new(0.0),
+            speed_modifier: AtomicCell::new(0.0),
+            has_split: AtomicBool::new(false),
         };
         let mob_arc = Arc::new(slime);
-        let mob_weak: Weak<dyn Mob> = {
-            let mob_arc: Arc<dyn Mob> = mob_arc.clone();
-            Arc::downgrade(&mob_arc)
-        };
 
         {
+            let mut move_control = mob_arc.entity.move_control.lock().unwrap();
+            *move_control = Box::new(SlimeMoveControl::new(Arc::downgrade(&mob_arc)));
+
             let mut goal_selector = mob_arc.entity.goals_selector.lock().unwrap();
             let mut target_selector = mob_arc.entity.target_selector.lock().unwrap();
 
-            goal_selector.add_goal(0, Box::new(SwimGoal::default()));
-            goal_selector.add_goal(5, Box::new(WanderAroundGoal::new(1.0)));
-            goal_selector.add_goal(
-                6,
-                LookAtEntityGoal::with_default(mob_weak, &EntityType::PLAYER, 6.0),
-            );
-            goal_selector.add_goal(6, Box::new(RandomLookAroundGoal::default()));
+            goal_selector.add_goal(1, Box::new(SlimeFloatGoal::new(mob_arc.clone())));
+            goal_selector.add_goal(2, Box::new(SlimeAttackGoal::new(mob_arc.clone())));
+            goal_selector.add_goal(3, Box::new(SlimeRandomDirectionGoal::new(mob_arc.clone())));
+            goal_selector.add_goal(5, Box::new(SlimeKeepOnJumpingGoal::new(mob_arc.clone())));
 
             target_selector.add_goal(
                 1,
                 ActiveTargetGoal::with_default(&mob_arc.entity, &EntityType::PLAYER, true),
             );
+            target_selector.add_goal(
+                3,
+                ActiveTargetGoal::with_default(&mob_arc.entity, &EntityType::IRON_GOLEM, true),
+            );
         };
 
+        mob_arc.randomize_size();
+
         mob_arc
     }
 
+    pub fn randomize_size(&self) {
+        let mut size_scale = rand::random_range(0..3);
+        if size_scale < 2 && rand::random_range(0.0..1.0) < 0.5 {
+            size_scale += 1;
+        }
+        let size = 1 << size_scale;
+        self.set_size(size, true);
+    }
+
+    pub fn set_size(&self, size: i32, update_health: bool) {
+        let actual_size = size.clamp(1, 127);
+        let entity = &self.entity.living_entity.entity;
+        entity.data.store(actual_size, Ordering::Relaxed);
+
+        // Update attributes
+        {
+            let mut attributes = self.entity.living_entity.attributes.write().unwrap();
+            if let Some(health) = attributes.get_mut(&Attributes::MAX_HEALTH.id) {
+                health.base_value = (actual_size * actual_size) as f64;
+                health.dirty.store(true, Ordering::Relaxed);
+            }
+            if let Some(speed) = attributes.get_mut(&Attributes::MOVEMENT_SPEED.id) {
+                speed.base_value = (0.2 + 0.1 * actual_size as f32) as f64;
+                speed.dirty.store(true, Ordering::Relaxed);
+            }
+            if let Some(damage) = attributes.get_mut(&Attributes::ATTACK_DAMAGE.id) {
+                damage.base_value = actual_size as f64;
+                damage.dirty.store(true, Ordering::Relaxed);
+            }
+        }
+
+        if update_health {
+            let max_health = self
+                .entity
+                .living_entity
+                .get_attribute_value(&Attributes::MAX_HEALTH) as f32;
+            self.entity.living_entity.health.store(max_health);
+        }
+
+        // Refresh dimensions
+        let scaled_dimensions = EntityDimensions {
+            width: entity.entity_type.dimension[0] * actual_size as f32,
+            height: entity.entity_type.dimension[1] * actual_size as f32,
+            eye_height: entity.entity_type.eye_height * actual_size as f32,
+        };
+        entity.entity_dimension.store(scaled_dimensions);
+
+        let pos = entity.pos.load();
+        let new_bb = BoundingBox::new_from_pos(pos.x, pos.y, pos.z, &scaled_dimensions);
+        entity.bounding_box.store(new_bb);
+    }
+
+    pub fn get_size(&self) -> i32 {
+        self.entity
+            .living_entity
+            .entity
+            .data
+            .load(Ordering::Relaxed)
+    }
+
+    pub fn is_tiny(&self) -> bool {
+        self.get_size() <= 1
+    }
+
+    pub fn check_slime_spawn_rules(world: &World, pos: &BlockPos) -> bool {
+        if world.level_info.load().difficulty == Difficulty::Peaceful {
+            return false;
+        }
+
+        // TODO: check spawn reason. if it's spawner, we should return true if block below is valid
+        // For now, we assume natural spawning as that's what we are implementing.
+
+        // Swamp/Surface Spawning
+        let biome = world.get_biome(pos);
+        if biome.has_tag(&pumpkin_data::tag::WorldgenBiome::MINECRAFT_ALLOWS_SURFACE_SLIME_SPAWNS)
+            && pos.0.y > 50
+            && pos.0.y < 70
+        {
+            let time = world.level_time.blocking_lock().time_of_day;
+            let moon_phase = (time / 24000) % 8;
+            let surface_slime_spawn_chance = Self::get_spawn_chance(moon_phase);
+            let mut rng = rand::rng();
+            if rng.random::<f32>() < surface_slime_spawn_chance
+                && world.get_max_local_raw_brightness(pos) <= rng.random_range(0..8)
+            {
+                return true;
+            }
+        }
+
+        // Slime Chunk Spawning
+        let chunk_pos = pos.chunk_position();
+        let world_seed = world.level.seed.0;
+        let slime_seed = pumpkin_util::random::seed_slime_chunk(
+            chunk_pos.x,
+            chunk_pos.y,
+            world_seed,
+            987_234_911,
+        );
+        let mut slime_rand = pumpkin_util::random::legacy_rand::LegacyRand::from_seed(slime_seed);
+
+        let mut rng = rand::rng();
+        if rng.random_range(0..10) == 0 && slime_rand.next_bounded_i32(10) == 0 && pos.0.y < 40 {
+            return true;
+        }
+
+        false
+    }
+
+    fn get_spawn_chance(moon_phase: i64) -> f32 {
+        match moon_phase {
+            0 => 1.0,
+            1 | 7 => 0.75,
+            2 | 6 => 0.5,
+            3 | 5 => 0.25,
+            4 => 0.0,
+            _ => 0.0,
+        }
+    }
+
     pub(crate) const fn hurt_sound_for_size(size: i32) -> Sound {
         if size == 1 {
             Sound::EntitySlimeHurtSmall
@@ -58,31 +205,66 @@ impl SlimeEntity {
             Sound::EntitySlimeHurt
         }
     }
+
+    fn get_jump_delay(&self) -> i32 {
+        rand::random_range(10..30)
+    }
+
+    fn rot_lerp(&self, start: f32, end: f32, max_step: f32) -> f32 {
+        let mut diff = (end - start).rem_euclid(360.0);
+        if diff > 180.0 {
+            diff -= 360.0;
+        }
+        start + diff.clamp(-max_step, max_step)
+    }
+
+    fn do_play_jump_sound(&self) -> bool {
+        self.get_size() > 0
+    }
+
+    fn get_jump_sound(&self) -> Sound {
+        if self.is_tiny() {
+            Sound::EntitySlimeJumpSmall
+        } else {
+            Sound::EntitySlimeJump
+        }
+    }
+
+    fn get_squish_sound(&self) -> Sound {
+        if self.is_tiny() {
+            Sound::EntitySlimeSquishSmall
+        } else {
+            Sound::EntitySlimeSquish
+        }
+    }
+
+    fn get_sound_volume(&self) -> f32 {
+        0.4 * self.get_size() as f32
+    }
+
+    fn get_sound_pitch(&self) -> f32 {
+        let pitch_adjuster = if self.is_tiny() { 1.4 } else { 0.8 };
+        (rand::random_range(0.0..1.0) - rand::random_range(0.0..1.0)) * 0.2 + 1.0 * pitch_adjuster
+    }
 }
 
 impl NBTStorage for SlimeEntity {
     fn write_nbt<'a>(&'a self, nbt: &'a mut NbtCompound) -> NbtFuture<'a, ()> {
         Box::pin(async move {
             self.entity.living_entity.write_nbt(nbt).await;
-            nbt.put_int(
-                "Size",
-                self.entity
-                    .living_entity
-                    .entity
-                    .data
-                    .load(Ordering::Relaxed),
-            );
+            nbt.put_int("Size", self.get_size() - 1);
+            nbt.put_bool("wasOnGround", self.was_on_ground.load(Ordering::Relaxed));
         })
     }
 
     fn read_nbt_non_mut<'a>(&'a self, nbt: &'a NbtCompound) -> NbtFuture<'a, ()> {
         Box::pin(async move {
             self.entity.living_entity.read_nbt_non_mut(nbt).await;
-            self.entity
-                .living_entity
-                .entity
-                .data
-                .store(nbt.get_int("Size").unwrap_or(0), Ordering::Relaxed);
+            self.set_size(nbt.get_int("Size").unwrap_or(0) + 1, false);
+            self.was_on_ground.store(
+                nbt.get_bool("wasOnGround").unwrap_or(false),
+                Ordering::Relaxed,
+            );
         })
     }
 }
@@ -91,6 +273,373 @@ impl Mob for SlimeEntity {
     fn get_mob_entity(&self) -> &MobEntity {
         &self.entity
     }
+
+    fn mob_tick<'a>(
+        &'a self,
+        _caller: &'a Arc<dyn EntityBase>,
+    ) -> crate::entity::EntityBaseFuture<'a, ()> {
+        Box::pin(async move {
+            self.o_squish.store(self.squish.load());
+            self.squish
+                .store(self.squish.load() + (self.target_squish.load() - self.squish.load()) * 0.5);
+
+            let on_ground = self
+                .entity
+                .living_entity
+                .entity
+                .on_ground
+                .load(Ordering::Relaxed);
+            let was_on_ground = self.was_on_ground.load(Ordering::Relaxed);
+
+            if on_ground && !was_on_ground {
+                // TODO: particles
+
+                let world = self.entity.living_entity.entity.world.load();
+                world.play_sound_fine(
+                    self.get_squish_sound(),
+                    SoundCategory::Hostile,
+                    &self.entity.living_entity.entity.pos.load(),
+                    self.get_sound_volume(),
+                    ((rand::random_range(0.0..1.0) - rand::random_range(0.0..1.0)) * 0.2 + 1.0)
+                        / 0.8,
+                );
+
+                self.target_squish.store(-0.5);
+            } else if !on_ground && was_on_ground {
+                self.target_squish.store(1.0);
+            }
+
+            self.was_on_ground.store(on_ground, Ordering::Relaxed);
+            self.target_squish.store(self.target_squish.load() * 0.6);
+
+            self.is_aggressive.store(false, Ordering::Relaxed);
+            self.speed_modifier.store(0.0);
+        })
+    }
+
+    fn mob_player_collision<'a>(
+        &'a self,
+        player: &'a Arc<crate::entity::player::Player>,
+    ) -> crate::entity::EntityBaseFuture<'a, ()> {
+        Box::pin(async move {
+            if !self.is_tiny() {
+                // dealDamage
+                self.entity.try_attack(self, &**player).await;
+            }
+        })
+    }
+
+    fn post_tick(&self) -> crate::entity::EntityBaseFuture<'_, ()> {
+        Box::pin(async move {
+            if self.entity.living_entity.dead.load(Ordering::Relaxed)
+                && self.get_size() > 1
+                && self
+                    .has_split
+                    .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+                    .is_ok()
+            {
+                let size = self.get_size();
+                let world = self.entity.living_entity.entity.world.load();
+                let pos = self.entity.living_entity.entity.pos.load();
+                let half_size = size / 2;
+                let count = 2 + rand::random_range(0..3);
+
+                let width = self
+                    .entity
+                    .living_entity
+                    .entity
+                    .entity_dimension
+                    .load()
+                    .width;
+                let xz_offset = width / 4.0;
+
+                for i in 0..count {
+                    let xd = ((i % 2) as f32 - 0.5) * xz_offset;
+                    let zd = ((i / 2) as f32 - 0.5) * xz_offset;
+
+                    let new_pos = pumpkin_util::math::vector3::Vector3::new(
+                        pos.x + xd as f64,
+                        pos.y + 0.5,
+                        pos.z + zd as f64,
+                    );
+                    let new_entity = Entity::new(world.clone(), new_pos, &EntityType::SLIME);
+                    let slime = SlimeEntity::new(new_entity);
+                    slime.set_size(half_size, true);
+                    slime
+                        .entity
+                        .living_entity
+                        .entity
+                        .yaw
+                        .store(rand::random_range(0.0..360.0));
+                    world.spawn_entity(slime).await;
+                }
+            }
+        })
+    }
+}
+
+pub struct SlimeMoveControl {
+    slime: Weak<SlimeEntity>,
+}
+
+impl SlimeMoveControl {
+    pub fn new(slime: Weak<SlimeEntity>) -> Self {
+        Self { slime }
+    }
+}
+
+impl Control for SlimeMoveControl {}
+
+impl MoveControlTrait for SlimeMoveControl {
+    fn tick(&mut self, mob: &dyn Mob) {
+        let Some(slime) = self.slime.upgrade() else {
+            return;
+        };
+        let mob_entity = mob.get_mob_entity();
+        let living_entity = &mob_entity.living_entity;
+        let entity = &living_entity.entity;
+
+        let current_yaw = entity.yaw.load();
+        let new_yaw = slime.rot_lerp(current_yaw, slime.target_yaw.load(), 90.0);
+        entity.yaw.store(new_yaw);
+        entity.head_yaw.store(new_yaw);
+        entity.body_yaw.store(new_yaw);
+
+        let speed_modifier = slime.speed_modifier.load();
+        let mut movement_input = Vector3::new(0.0, 0.0, 0.0);
+
+        let on_ground = entity.on_ground.load(Ordering::Relaxed);
+
+        if on_ground {
+            if speed_modifier > 0.0 {
+                let current_delay = slime.jump_delay.load(Ordering::Relaxed);
+                if current_delay <= 0 {
+                    // Start jump
+                    let mut next_delay = slime.get_jump_delay();
+                    if slime.is_aggressive.load(Ordering::Relaxed) {
+                        next_delay /= 3;
+                    }
+                    slime.jump_delay.store(next_delay, Ordering::Relaxed);
+                    living_entity.jumping.store(true, Ordering::SeqCst);
+                    if slime.do_play_jump_sound() {
+                        let world = entity.world.load();
+                        world.play_sound_fine(
+                            slime.get_jump_sound(),
+                            SoundCategory::Hostile,
+                            &entity.pos.load(),
+                            slime.get_sound_volume(),
+                            slime.get_sound_pitch(),
+                        );
+                    }
+                    movement_input.z = speed_modifier;
+                } else {
+                    slime.jump_delay.store(current_delay - 1, Ordering::Relaxed);
+                    living_entity.jumping.store(false, Ordering::SeqCst);
+                }
+            } else {
+                living_entity.jumping.store(false, Ordering::SeqCst);
+            }
+        } else {
+            // In air: move forward but don't "jump" again
+            if speed_modifier > 0.0 {
+                movement_input.z = speed_modifier;
+            }
+            living_entity.jumping.store(false, Ordering::SeqCst);
+        }
+        living_entity.movement_input.store(movement_input);
+    }
+}
+
+pub struct SlimeFloatGoal {
+    slime: Arc<SlimeEntity>,
+}
+
+impl SlimeFloatGoal {
+    pub fn new(slime: Arc<SlimeEntity>) -> Self {
+        Self { slime }
+    }
+}
+
+impl Goal for SlimeFloatGoal {
+    fn can_start<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, bool> {
+        Box::pin(async move {
+            let entity = &self.slime.entity.living_entity.entity;
+            entity.touching_water.load(Ordering::Relaxed)
+                || entity.touching_lava.load(Ordering::Relaxed)
+        })
+    }
+
+    fn tick<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
+        Box::pin(async move {
+            if rand::random_range(0.0..1.0) < 0.8 {
+                self.slime
+                    .entity
+                    .living_entity
+                    .jumping
+                    .store(true, Ordering::SeqCst);
+            }
+            self.slime.speed_modifier.store(1.2);
+        })
+    }
+
+    fn should_run_every_tick(&self) -> bool {
+        true
+    }
+
+    fn controls(&self) -> crate::entity::ai::goal::Controls {
+        crate::entity::ai::goal::Controls::JUMP | crate::entity::ai::goal::Controls::MOVE
+    }
+}
+
+pub struct SlimeAttackGoal {
+    slime: Arc<SlimeEntity>,
+    grow_tired_timer: i32,
+}
+
+impl SlimeAttackGoal {
+    pub fn new(slime: Arc<SlimeEntity>) -> Self {
+        Self {
+            slime,
+            grow_tired_timer: 0,
+        }
+    }
+}
+
+impl Goal for SlimeAttackGoal {
+    fn can_start<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, bool> {
+        Box::pin(async move {
+            let target = self.slime.entity.target.lock().await;
+            target.is_some()
+        })
+    }
+
+    fn start<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
+        Box::pin(async move {
+            self.grow_tired_timer = 300;
+        })
+    }
+
+    fn should_continue<'a>(&'a self, _mob: &'a dyn Mob) -> GoalFuture<'a, bool> {
+        Box::pin(async move {
+            let target = self.slime.entity.target.lock().await;
+            target.is_some() && self.grow_tired_timer > 0
+        })
+    }
+
+    fn tick<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
+        Box::pin(async move {
+            self.grow_tired_timer -= 1;
+            let target_guard = self.slime.entity.target.lock().await;
+            if let Some(target) = target_guard.as_ref() {
+                let pos = target.get_entity().pos.load();
+                let my_pos = self.slime.entity.living_entity.entity.pos.load();
+                let dx = pos.x - my_pos.x;
+                let dz = pos.z - my_pos.z;
+                let yaw = dx.atan2(dz).to_degrees() as f32;
+                self.slime.target_yaw.store(yaw);
+            }
+            self.slime.is_aggressive.store(true, Ordering::Relaxed);
+        })
+    }
+
+    fn should_run_every_tick(&self) -> bool {
+        true
+    }
+
+    fn controls(&self) -> crate::entity::ai::goal::Controls {
+        crate::entity::ai::goal::Controls::LOOK
+    }
+}
+
+pub struct SlimeRandomDirectionGoal {
+    slime: Arc<SlimeEntity>,
+    chosen_degrees: f32,
+    next_randomize_time: i32,
+}
+
+impl SlimeRandomDirectionGoal {
+    pub fn new(slime: Arc<SlimeEntity>) -> Self {
+        Self {
+            slime,
+            chosen_degrees: 0.0,
+            next_randomize_time: 0,
+        }
+    }
+}
+
+impl Goal for SlimeRandomDirectionGoal {
+    fn can_start<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, bool> {
+        Box::pin(async move {
+            let target = self.slime.entity.target.lock().await;
+            target.is_none()
+                && (self
+                    .slime
+                    .entity
+                    .living_entity
+                    .entity
+                    .on_ground
+                    .load(Ordering::Relaxed)
+                    || self
+                        .slime
+                        .entity
+                        .living_entity
+                        .entity
+                        .touching_water
+                        .load(Ordering::Relaxed)
+                    || self
+                        .slime
+                        .entity
+                        .living_entity
+                        .entity
+                        .touching_lava
+                        .load(Ordering::Relaxed))
+        })
+    }
+
+    fn tick<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
+        Box::pin(async move {
+            self.next_randomize_time -= 1;
+            if self.next_randomize_time <= 0 {
+                self.next_randomize_time = rand::random_range(40..100);
+                self.chosen_degrees = rand::random_range(0.0..360.0);
+            }
+            self.slime.target_yaw.store(self.chosen_degrees);
+            self.slime.is_aggressive.store(false, Ordering::Relaxed);
+        })
+    }
+
+    fn controls(&self) -> crate::entity::ai::goal::Controls {
+        crate::entity::ai::goal::Controls::LOOK
+    }
+}
+
+pub struct SlimeKeepOnJumpingGoal {
+    slime: Arc<SlimeEntity>,
+}
+
+impl SlimeKeepOnJumpingGoal {
+    pub fn new(slime: Arc<SlimeEntity>) -> Self {
+        Self { slime }
+    }
+}
+
+impl Goal for SlimeKeepOnJumpingGoal {
+    fn can_start<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, bool> {
+        Box::pin(async move {
+            let vehicle = self.slime.entity.living_entity.entity.vehicle.lock().await;
+            vehicle.is_none()
+        })
+    }
+
+    fn tick<'a>(&'a mut self, _mob: &'a dyn Mob) -> GoalFuture<'a, ()> {
+        Box::pin(async move {
+            self.slime.speed_modifier.store(1.0);
+        })
+    }
+
+    fn controls(&self) -> crate::entity::ai::goal::Controls {
+        crate::entity::ai::goal::Controls::JUMP | crate::entity::ai::goal::Controls::MOVE
+    }
 }
 
 #[cfg(test)]

pumpkin/src/entity/type.rs

@@ -338,6 +338,9 @@ pub fn check_spawn_rules(
     if id == EntityType::BAT.id {
         return bat::BatEntity::check_bat_spawn_rules(world, pos);
     }
+    if id == EntityType::SLIME.id {
+        return SlimeEntity::check_slime_spawn_rules(world, pos);
+    }
 
     // TODO
     true