extends Spatial

onready var camera := $Camera
onready var hand := $Camera/Hand
onready var cards := $Cards
onready var handCard := $Camera/Hand/Card4

export var mouseHandThreshold = 0.9

var holdingCard: bool

var mouseOrigin: Vector2
var lastCameraTransform: Transform

func _input(event: InputEvent):
	# Camera zoom
	if event.is_action("zoom_in"):
		camera.zoom(true)
	elif event.is_action("zoom_out"):
		camera.zoom(false)
	# Save original camera and mouse position before panning
	if event.is_action_pressed("pan"):
		mouseOrigin = get_viewport().get_mouse_position()
		lastCameraTransform = camera.transform

func _process(delta: float):
	# If mouse is under a certain area then we're managing our hand
	var absMousePos := get_viewport().get_mouse_position()
	# If panning, translate mouse delta to camera delta
	if Input.is_action_pressed("pan"):
		var mouseDelta := absMousePos - mouseOrigin
		var mousePos: Vector2 = mouseDelta * 0.0096 * (1-camera.getZoomLevel()/5) # Magic numbers everywhere
		camera.transform.origin = lastCameraTransform.origin - Vector3(mousePos.x, 0, mousePos.y)
	# If holding a card, move it between board/hand
	if holdingCard:
		var relPos: float = absMousePos.y / get_viewport().size.y
		var selectingHand: bool = relPos > mouseHandThreshold
		if selectingHand and not handCard.inHand:
			call_deferred("reparent", handCard, cards, hand)
			handCard.inHand = true
		elif not selectingHand and handCard.inHand:
			call_deferred("reparent", handCard, hand, cards)
			handCard.inHand = false

func _card_picked():
	holdingCard = true

func _card_dropped():
	holdingCard = false

func reparent(object: Node, from: Node, to: Node):
	from.remove_child(object)
	to.add_child(object)
	object.set_owner(to)