class_name BulletTool

static func fromArea(area: Area2D) -> BulletBase:
	if area is BulletBase:
		return area as BulletBase
	else:
		return null
static func canDamage(bullet: BulletBase, target: EntityBase) -> bool:
	if !bullet or !target or !bullet.launcher: return false
	if target.currentInvinsible: return false
	var launcherIsPlayer = bullet.launcher.isPlayer()
	if bullet.launcher is SummonBase:
		var summon = bullet.launcher as SummonBase
		if is_instance_valid(summon.myMaster):
			launcherIsPlayer = summon.myMaster.isPlayer()
	if !GameRule.allowFriendlyFire and !bullet.allowFriendlyDamage:
		if target.isPlayer() == launcherIsPlayer and bullet.launcher.currentFocusedBoss != target:
			return false
	if !bullet.canDamageSelf:
		if target == bullet.launcher:
			return false
	return true
static func findClosetBullet(to: Vector2, fromTree: SceneTree) -> BulletBase:
	var result: BulletBase = null
	var lastDistance = INF
	for bullet in fromTree.get_nodes_in_group("bullets"):
		if to.distance_to(bullet.position) < lastDistance:
			lastDistance = to.distance_to(bullet.position)
			result = bullet
	return result
static func findClosetBulletCanDamage(to: Vector2, fromTree: SceneTree, target: EntityBase, maxDistance: float = INF) -> BulletBase:
	var result: BulletBase = null
	var lastDistance = INF
	for bullet in fromTree.get_nodes_in_group("bullets"):
		if canDamage(bullet, target):
			if to.distance_to(bullet.position) < lastDistance:
				lastDistance = to.distance_to(bullet.position)
				result = bullet
	if is_instance_valid(result):
		if result.position.distance_to(to) > maxDistance:
			return null
	return result