class_name ScoreLabel
extends Control

const DESIRED_SCALE := Vector2.ONE * .5

static var instance: ScoreLabel

@onready var label: Label = get_child(0)
var tween: Tween
var _display_score := 0
var score := 0:
	set(v):
		var delta = abs(v - score)
		score = v

		if label != null:
			if tween != null: tween.stop()
			tween = create_tween()
			tween.tween_method((func(n):
				_display_score = n
				label.text = str(n)
			), _display_score, score, .25)

			scale += Vector2.ONE * pow(delta, 1.25) / 400

func exp_lerp(a: Variant, b: Variant, decay: float, dt: float) -> Variant:
	return lerp(a, b, 1 - exp(-decay * dt))

func _init() -> void:
	instance = self

func _ready() -> void:
	scale = DESIRED_SCALE
	score = score
	SignalBus.building_destroyed.connect(func(_building, increment):
		score += increment
	)

func _process(delta: float) -> void:
	pass
	scale = exp_lerp(scale, DESIRED_SCALE, 05, delta)