extends Control

var battery_positions = [Vector3(0.0, 0.0, 3.0),
						Vector3(-3.0, 0.0, -3.0),
						Vector3(0.0, 0.0, -3.0),
						Vector3(3.0, 0.0, -3.0)]
@onready var player: CharacterBody3D = $".."
@onready var batteries = [$Panel/SubViewportContainer/SubViewport/batteries/Battery,
						$Panel/SubViewportContainer/SubViewport/batteries/Battery2,
						$Panel/SubViewportContainer/SubViewport/batteries/Battery3,
						$Panel/SubViewportContainer/SubViewport/batteries/Battery4]
var max_pos = 4
var index_shown_battery = 0

func _ready():
	update_label()

func _on_arrow_left_pressed() -> void:
	index_shown_battery -= 1
	index_shown_battery = posmod(index_shown_battery, max_pos)
	for index in range(0, len(batteries)):
		var battery = batteries[index]
		var new_pos_index = posmod(index - index_shown_battery, max_pos)
		battery.position = battery_positions[new_pos_index]
	update_label()


func _on_arrow_right_pressed() -> void:
	index_shown_battery += 1
	index_shown_battery = index_shown_battery % max_pos
	for index in range(0, len(batteries)):
		var battery = batteries[index]
		var new_pos_index = (index - index_shown_battery) % max_pos
		battery.position = battery_positions[new_pos_index]
	update_label()

func update_label() -> void:
	print(index_shown_battery)
	$Panel/BatteryLabel.text = batteries[index_shown_battery].battery_label


func _on_button_pressed() -> void:
	if not player.grabbed_item:
		var child = batteries[index_shown_battery]
		remove_child(child)
		max_pos -= 1
		batteries.remove_at(index_shown_battery)
		battery_positions.remove_at(-1)
		index_shown_battery = 0
		get_tree().current_scene.add_child(child)  # zurück zur Welt
		if child is RigidBody3D:
			child.freeze = false
			child.gravity_scale = 1.0
		player.interact_ray.grab(child)
		if len(batteries) > 0:
			reset_batteries()
	player.toggle_inventory()

func reset_batteries() -> void:
	for index in range(0, len(batteries)):
		var battery = batteries[index]
		battery.position = battery_positions[index]
	update_label()



func _unhandled_input(event: InputEvent) -> void:
	if self.visible: 
		if event is InputEventKey and event.pressed:
			print(event.keycode)
			if event.keycode == KEY_ENTER:
				_on_button_pressed()
				accept_event()
		if Input.is_action_just_pressed("ui_left"):
			_on_arrow_left_pressed()
		elif Input.is_action_just_pressed("ui_right"):
			_on_arrow_right_pressed()