Refactor conversation stuff

item/Item.gd

@@ -8,6 +8,11 @@ enum ItemType {
   KEY_ITEM,
 }
 
+enum ItemId {
+  NULL,
+  POTION,
+}
+
 # Properties
 var itemType:ItemType
 var key:String
@@ -22,5 +27,11 @@ func getName() -> String:
   return self.key
 
 # Item Table
-static var NULL:Item = Item.new("NULL", ItemType.NULL)
-static var POTION:Item = Item.new("POTION", ItemType.MEDICINE)
+static var ITEM_DEFINITIONS = {
+  [ItemId.NULL]: Item.new("NULL", ItemType.NULL),
+  [ItemId.POTION]: Item.new("POTION", ItemType.MEDICINE),
+}
+
+static func getItemById(itemId:ItemId) -> Item:
+  assert(ITEM_DEFINITIONS.has(itemId))
+  return ITEM_DEFINITIONS[itemId]