Whatever lol

item/Inventory.gd

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+class_name Inventory
+const Item = preload("res://item/Item.gd")
+const ItemStack = preload("res://item/ItemStack.gd")
+
+var items:Array[ItemStack] = []
+
+enum InventorySortType {
+  ITEM_TYPE,
+  ITEM_KEY
+}
+
+signal itemAdded(item:Item)
+signal itemRemoved(item:Item)
+signal itemQuantityChanged(item:Item, quantity:int)
+signal inventorySorted(sortBy:InventorySortType, reverse:bool)
+
+func setItem(item:Item, quantity:int) -> void:
+  if quantity < 0:
+    push_error("Cannot set item quantity to negative value, using 0")
+    quantity = 0
+
+  # Is item already in inventory?
+  for itemStack in items:
+    if itemStack.item != item:
+      continue
+    
+    # Item stack already present.
+    if quantity == 0:
+      items.erase(itemStack)
+      itemRemoved.emit(item)
+      itemQuantityChanged.emit(item, 0)
+    else:
+      itemStack.quantity = quantity
+      itemQuantityChanged.emit(item, quantity)
+    return
+
+  # Not in stack, create new stack
+  var stack:ItemStack = ItemStack.new()
+  stack.item = item
+  stack.quantity = quantity
+  items.append(stack)
+  itemAdded.emit(item)
+  itemQuantityChanged.emit(item, quantity)
+
+func getItemQuantity(item:Item) -> int:
+  for itemStack in items:
+    if itemStack.item == item:
+      return itemStack.quantity
+  return 0
+
+func addItem(item:Item, quantity:int = 1) -> void:
+  # Add can only take positive quantities, otherwise use set or remove
+  if quantity <= 0:
+    push_error("Cannot add non-positive item quantity")
+    return
+  self.setItem(item, self.getItemQuantity(item) + quantity)
+
+func removeItem(item:Item) -> void:
+  self.setItem(item, 0)
+
+func sort(sortBy:InventorySortType, reverse:bool = false) -> void:
+  match sortBy:
+    InventorySortType.ITEM_TYPE:
+      items.sort_custom(_sortByItemType)
+    InventorySortType.ITEM_KEY:
+      items.sort_custom(_sortByItemKey)
+  
+  if reverse:
+    items.reverse()
+
+  inventorySorted.emit(sortBy, reverse)
+
+# Sorters
+func _sortByItemType(a:ItemStack, b:ItemStack) -> int:
+  return int(a.item.itemType) - int(b.item.itemType)
+
+func _sortByItemKey(a:ItemStack, b:ItemStack) -> int:
+  return a.item.key.casecmp_to(b.item.key)