class_name SceneManager extends Node2D

var bullet = preload("res://scenes/bullet.tscn")

@onready var coins: Node2D = $"../Coins"
@onready var enemies: Node2D = $"../Enemies"

var bulletArray = []
var totalAllowedBullets = 7

var grenade = preload("res://scenes/grenade.tscn")

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	Gamecontroller.reset()
	buildLevel()

func buildLevel() -> void:
	# hook up coins
	if coins:
		updateCoins()
	
	if enemies:
		updateEnemies()
	
	# wire up signals from GameController
	Gamecontroller.levelChangeSignal.connect(changeScene)
	Gamecontroller.destroySignal.connect(destroy)

func updateEnemies() -> void:
	var totalEnemies = 0
	for obj in enemies.get_children():
		if obj is Slime:
			totalEnemies += 1
			# hook up a listener at the game controller
			if not obj.slimeDamageSignal.is_connected(Gamecontroller._on_slime_damage):
				obj.slimeDamageSignal.connect(Gamecontroller._on_slime_damage)
				Gamecontroller.addEnemyToLevel(obj)
	Gamecontroller.totalEnemies(totalEnemies)

func updateCoins() -> void:
	var totalCoins = 0
	for obj in coins.get_children():
		if obj is Coin:
			totalCoins += 1
			# hook up a listener at the game controller
			if not obj.coinCollectedSignal.is_connected(Gamecontroller._on_coin_collected):
				obj.coinCollectedSignal.connect(Gamecontroller._on_coin_collected)
			if not obj.tree_exited.is_connected(updateCoins):
				obj.tree_exited.connect(updateCoins)
	# tell GC how many coins total
	Gamecontroller.totalCoins(totalCoins)

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass

func bulletFactory()->Bullet:
	var myBullet:Bullet
	if bulletArray.size() < totalAllowedBullets:
		# make a new bullet
		myBullet = bullet.instantiate()
		myBullet.bulletDamageSignal.connect(Gamecontroller.bulletDamage)
		owner.add_child(myBullet)
	else:
		myBullet = bulletArray.pop_back()
		
	bulletArray.push_front(myBullet)
	return myBullet

func makeBullet(_bulletPosition, _bulletSpeed)->void:
	print("make a bullet, put it in the world")
	var myBullet = bulletFactory()
	myBullet.transform = _bulletPosition
	myBullet.setSpeed(_bulletSpeed)

func makeGrenade(_grenadePosition, _grenadeDirection)->void:
	print("SM make a grenade")
	var myGrenade:Grenade = grenade.instantiate()
	owner.add_child(myGrenade)
	myGrenade.apply_central_impulse(Vector2(_grenadeDirection, -1)*200)
	myGrenade.transform = _grenadePosition

func changeScene(level) -> void:
	get_tree().call_deferred("change_scene_to_file", level)

func destroy(body) -> void:
	body.queue_free()