extends Node
var failures := 0
func check(ok: bool, message: String) -> void:
	if not ok:
		failures += 1
		push_error(message)
func count_numbers() -> int:
	var count := 0
	for child: Node in get_children():
		if child.get_script() == load("res://scripts/combat/damage_number.gd"):
			count += 1
	return count
func _ready() -> void:
	GameState.save_locked = true
	call_deferred("run")
func run() -> void:
	var hero = load("res://scenes/player/player.tscn").instantiate()
	add_child(hero)
	hero.set_physics_process(false)
	var enemy = load("res://scenes/enemies/enemy.tscn").instantiate()
	add_child(enemy)
	enemy.set_physics_process(false)
	enemy.active = true
	# The squirrel's zero-damage lunge must not immunize the hero against its
	# real body contact, including when both land during the same frame.
	enemy.setup("crazy_squirrel")
	enemy.target = hero
	hero.health = 100.0
	hero.invulnerability = 0.0
	var health_events: Array = []
	hero.health_changed.connect(func(current: float, _maximum: float): health_events.append(current))
	hero.take_damage(0.0)
	check(is_zero_approx(hero.invulnerability) and health_events.is_empty(), "zero damage grants no immunity or hurt event")
	enemy._perform_direct_hit(Vector2.RIGHT)
	check(hero.health < 100.0, "squirrel body contact still hurts after its zero-damage lunge")
	var wounded: float = hero.health
	var contacts := int(GameState.get_entity_counter("enemies", "crazy_squirrel", "times_damaged_player"))
	enemy._perform_direct_hit(Vector2.RIGHT)
	check(hero.health == wounded, "real hurt immunity still blocks subsequent contact")
	check(GameState.get_entity_counter("enemies", "crazy_squirrel", "times_damaged_player") == contacts,
		"a refused contact does not count as damage")
	hero.invulnerability = 0.0
	for actor in [hero, enemy]:
		actor.health = 100.0
		actor.attack_invulnerable = false
		var before := count_numbers()
		actor.take_damage(0.0, Vector2.RIGHT, 100.0)
		check(count_numbers() == before, "intentional zero hit emits no number")
		check(actor.health == 100.0 and actor.knockback_velocity.x > 0.0, "zero hit preserves health and knockback")
		if actor == hero:
			hero.invulnerability = 0.0
		actor.attack_invulnerable = true
		before = count_numbers()
		actor.take_damage(0.0)
		check(count_numbers() == before, "invulnerability does not display an intentional zero")
		actor.take_damage(5.0)
		check(count_numbers() == before + 1, "blocked positive damage retains its feedback")
		actor.attack_invulnerable = false
		before = count_numbers()
		actor.take_damage(2.0)
		check(count_numbers() == before + 1, "positive damage still displays")
	check(hero._roll_damage(0.0) == 0.0, "zero authored hero damage stays zero")
	check(hero._roll_damage(0.1) >= 1.0, "positive damage retains existing minimum")
	AudioDirector.stop_all()
	await get_tree().process_frame
	print("ZERO HIT NUMBERS: ", "PASSED" if failures == 0 else "FAILED")
	get_tree().quit(0 if failures == 0 else 1)