update

enemy/enemy_movement.gd

@@ -0,0 +1,62 @@
+extends Node
+
+const SPEED := 3.0
+const ATTACK_RANGE := 2.0
+const REGEN_FAST := 0.10
+const REGEN_SLOW := 0.01
+
+@onready var enemy: CharacterBody3D = get_parent()
+@onready var nav_agent: NavigationAgent3D = get_parent().get_node("NavigationAgent3D")
+
+func _physics_process(delta: float) -> void:
+  match enemy.state:
+    enemy.State.IDLE:
+      enemy.velocity.x = 0
+      enemy.velocity.z = 0
+    enemy.State.CHASE:
+      _chase()
+    enemy.State.RETURN:
+      _return_to_spawn(delta)
+
+func _chase() -> void:
+  if not is_instance_valid(enemy.target):
+    enemy.state = enemy.State.RETURN
+    return
+  var dist_to_target := enemy.global_position.distance_to(enemy.target.global_position)
+  if dist_to_target <= ATTACK_RANGE:
+    enemy.state = enemy.State.ATTACK
+    return
+  nav_agent.target_position = enemy.target.global_position
+  var next_pos := nav_agent.get_next_path_position()
+  var direction := (next_pos - enemy.global_position).normalized()
+  direction.y = 0
+  enemy.velocity.x = direction.x * SPEED
+  enemy.velocity.z = direction.z * SPEED
+
+func _return_to_spawn(delta: float) -> void:
+  var dist := enemy.global_position.distance_to(enemy.spawn_position)
+  if dist < 1.0:
+    enemy.state = enemy.State.IDLE
+    enemy.velocity.x = 0
+    enemy.velocity.z = 0
+    return
+  nav_agent.target_position = enemy.spawn_position
+  var next_pos := nav_agent.get_next_path_position()
+  var direction := (next_pos - enemy.global_position).normalized()
+  direction.y = 0
+  enemy.velocity.x = direction.x * SPEED
+  enemy.velocity.z = direction.z * SPEED
+  _regenerate(delta)
+
+func _regenerate(delta: float) -> void:
+  var health: float = Stats.get_stat(enemy, "health")
+  var max_health: float = Stats.get_stat(enemy, "max_health")
+  if health == null or max_health == null:
+    return
+  if health < max_health:
+    var rate: float = REGEN_FAST
+    if health >= max_health * 0.99:
+      rate = REGEN_SLOW
+    health = min(health + max_health * rate * delta, max_health)
+    Stats.set_stat(enemy, "health", health)
+    EventBus.health_changed.emit(enemy, health, max_health)