@abstract
extends Resource

## Class that can hold items in it
class_name Inventory

signal stack_added(item : Stack,position : int)
signal stack_taken(item : Stack,position : int)

func _init() -> void:
	resource_local_to_scene = true

## Tries to add an item into inventory. Returns not stored stack of item.
@abstract
func add(stack : Stack) -> Stack

## Returns if conditions of adding are met
@abstract
func can_add() -> bool

## Tries to take first item. Returns null if no items in inventory
@abstract
func pop() -> Stack

## Tries to take certain item from inventory. Returns null if no item found
@abstract
func take(item : Item,amount: int) -> Stack

## Finds first entry of item. Returns -1 if no item found
@abstract
func find(item : Item) -> int

## Does inventory have certain item?
func has(item : Item) -> bool:
	return find(item) != -1