extends Node2D
class_name SelectionManager

const SIGNAL_SELECTION_CHANGED = "selection-changed"

@export var selected_box_hidden_color = Color(1, 1, 1, 0)
@export var selected_box_color = Color(1, 1, 1, 0.6)
@onready var selection: Array[Positional] = []
var anim_t: float = 0.0

func _process(delta):
	anim_t += delta * 8
	anim_t = clamp(anim_t, 0, 1)
	queue_redraw()

func clear():
	anim_t = 0
	selection = []
	emit_signal(SIGNAL_SELECTION_CHANGED)
	print("clear selection ", len(selection))

func append_array(items: Array[Positional]):
	selection.append_array(items)
	emit_signal(SIGNAL_SELECTION_CHANGED)

func select_array(items: Array[Positional]):
	clear()
	if items.is_empty():
		return
	append_array(items)
	print("selected ", len(selection))

func _draw():
	if selection.is_empty():
		return
	for tile in selection:
		draw_rect(
			tile.worldbox.grow(lerp(-16, 0, anim_t)),
			lerp(selected_box_hidden_color, selected_box_color, anim_t ** 1.3),
			false, 3
		)