update

systems/shield_system.gd

@@ -0,0 +1,38 @@
+extends Node
+
+func _process(delta: float) -> void:
+  for entity in Stats.entities:
+    if not is_instance_valid(entity):
+      continue
+    var data: Dictionary = Stats.entities[entity]
+    if not data["alive"]:
+      continue
+    var max_shield: float = data["max_shield"]
+    if max_shield <= 0:
+      continue
+    var shield: float = data["shield"]
+    if shield < max_shield:
+      data["shield_regen_timer"] += delta
+      if data["shield_regen_timer"] >= data["shield_regen_delay"]:
+        var regen_rate: float = max_shield / data["shield_regen_time"]
+        shield += regen_rate * delta
+        if shield >= max_shield:
+          shield = max_shield
+          EventBus.shield_regenerated.emit(entity)
+        data["shield"] = shield
+        EventBus.shield_changed.emit(entity, shield, max_shield)
+
+func absorb(entity: Node, amount: float) -> float:
+  var shield: float = Stats.get_stat(entity, "shield")
+  if shield == null or shield <= 0:
+    return amount
+  Stats.set_stat(entity, "shield_regen_timer", 0.0)
+  var absorbed: float = min(amount, shield)
+  shield -= absorbed
+  Stats.set_stat(entity, "shield", shield)
+  var max_shield: float = Stats.get_stat(entity, "max_shield")
+  if shield <= 0:
+    EventBus.shield_broken.emit(entity)
+  EventBus.shield_changed.emit(entity, shield, max_shield)
+  return amount - absorbed
+