update

scripts/systems/enemy_ai_system.gd

@@ -0,0 +1,36 @@
+extends Node
+
+var attack_timers: Dictionary = {}
+
+func _physics_process(delta: float) -> void:
+  for enemy in get_tree().get_nodes_in_group("enemies"):
+    if not is_instance_valid(enemy) or not Stats.is_alive(enemy):
+      continue
+    if enemy.state != enemy.State.ATTACK:
+      continue
+    _handle_attack(enemy, delta)
+
+func _handle_attack(enemy: Node, delta: float) -> void:
+  if enemy not in attack_timers:
+    attack_timers[enemy] = 0.0
+  attack_timers[enemy] -= delta
+
+  if not is_instance_valid(enemy.target):
+    enemy.state = enemy.State.RETURN
+    return
+
+  var base: BaseStats = Stats.get_base(enemy)
+  var attack_range: float = base.attack_range if base is EnemyStats else 2.0
+  var dist: float = enemy.global_position.distance_to(enemy.target.global_position)
+  if dist > attack_range:
+    enemy.state = enemy.State.CHASE
+    return
+
+  if attack_timers[enemy] <= 0:
+    var attack_cooldown: float = base.attack_cooldown if base is EnemyStats else 1.5
+    var attack_damage: float = base.attack_damage if base is EnemyStats else 5.0
+    attack_timers[enemy] = attack_cooldown
+    EventBus.damage_requested.emit(enemy, enemy.target, attack_damage)
+
+  enemy.velocity.x = 0
+  enemy.velocity.z = 0