Initial commit

singletons/Inventory.gd

@@ -0,0 +1,45 @@
+extends Node
+
+"""
+Minimal inventory system implementation. 
+It's just a dictionary where items are identified by a string key and hold an int amount
+"""
+
+# action can be 'added' some amount of some items is added and 'removed' when some amount
+# of some item is removed
+signal item_changed(action, type, amount)
+
+var inventory = {}
+
+
+func get_item(type:String) -> int:
+	if inventory.has(type):
+		return inventory[type]
+	else:
+		return 0
+
+
+func add_item(type:String, amount:int) -> bool:
+	if inventory.has(type):
+		inventory[type] += amount
+		emit_signal("item_changed", "added", type, amount)
+		return true
+	else:
+		inventory[type] = amount
+		emit_signal("item_changed", "added", type, amount)
+		return true
+
+
+func remove_item(type:String, amount:int) -> bool:
+	if inventory.has(type) and inventory[type] >= amount:
+		inventory[type] -= amount
+		if inventory[type] == 0:
+			inventory.erase(type)
+		emit_signal("item_changed", "removed", type, amount)
+		return true
+	else:
+		return false
+
+
+func list() -> Dictionary:
+	return inventory.duplicate()