@tool
extends Inventory

class_name InOutInventory

@export var input_capacity : int
@export var output_capacity : int

@export_storage var input_array : Array[InventorySlot]
@export_storage var output_slot : InventorySlot

func resize() -> void:
	input_array.resize(input_capacity)
	for i in range(input_capacity):
		input_array[i] = InventorySlot.new()
	output_slot = InventorySlot.new()

func _init() -> void:
	super()
	resize.call_deferred()

func add(stack : Stack) -> Stack:
	for i in range(input_capacity):
		if input_array[i].can_be_merged(stack.held_item):
			stack_added.emit(stack,i)
			input_array[i].merge_stack(stack)
		if stack.is_valid() == false:
			return null
	return stack

func add_from_side(stack : Stack, _ang_diff : float) -> Stack:
	return add(stack)

func can_add(item : Item = null) -> bool:
	if item == null:
		return false
	else:
		for i in range(input_capacity):
			if input_array[i].can_be_merged(item):
				return true
		return false

func can_add_from_side(_ang_diff : float,item: Item = null) -> bool:
	return can_add(item)

## Tries to take first item. Returns null if no items in inventory
func pop() -> Stack:
	if output_slot.held_item != null:
		var extracted = output_slot.extract()
		stack_taken.emit(extracted,0)
		return extracted
	return null

func peek() -> Stack:
	if output_slot.held_item != null:
		var peeked = output_slot.as_stack()
		return peeked
	return null

## Tries to take certain item from inventory. Returns null if no item found
func take(item: Item,amount: int) -> Stack:
	if item != output_slot.filter:
		return null
	var extracted = output_slot.extract_stack(amount)
	return extracted

func find_input(item : Item) -> int:
	for i in range(input_capacity):
		if input_array[i].held_item == item:
			return i
	return -1

func find(item : Item) -> int:
	if output_slot.held_item == item:
		return 0
	return -1