Working meta scenes

scripts/System/ItemSystem.gd

@@ -17,7 +17,9 @@ class ItemStackTypeComparator:
 
 # Constants
 const ITEM_STACK_SIZE_MAX = 99;
-var ITEM_POTION = preload("res://scripts/Item/Potion.gd").new();
+static var ITEM_POTION = preload("res://scripts/Item/Potion.gd").new();
+
+# Class
 var inventory:Array[ItemStack] = [];
 
 # Methods
@@ -78,6 +80,23 @@ func removeItem(item: Item, quantity: int) -> void:
 		if quantity == 0:
 			return
 
+func removeStack(stack: ItemStack) -> void:
+	self.removeItem(stack.item, stack.quantity);
+
+func hasItem(item: Item, quantity: int = 1) -> bool:
+	var totalQuantity = 0
+	
+	for stack in inventory:
+		if stack.item != item:
+			continue
+		
+		totalQuantity += stack.quantity
+
+		if totalQuantity >= quantity:
+			return true
+	
+	return false
+
 func sortBy(by:ItemSortType) -> void:
 	match by:
 		ItemSortType.NAME: