class_name SceneManager extends Node2D

var bullet = preload("res://scenes/bullet.tscn")
var grenade = preload("res://scenes/grenade.tscn")
@onready var coins = $"../Coins"
@onready var enemies = $"../Enemies"


var bulletArray = []
var totalAllowedBullets = 7

# Called when the node enters the scene tree for the first time.
func _ready():
	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 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:
			if not obj.coinCollectedSignal.is_connected(Gamecontroller._on_coin_collected):
				#hook up a listener at the game controller
				obj.coinCollectedSignal.connect(Gamecontroller._on_coin_collected)
			if not obj.tree_exited.is_connected(updateCoins):
				obj.tree_exited.connect(updateCoins)
			totalCoins +=1
	#tell GC how many coins total
	Gamecontroller.totalCoins(totalCoins)	
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	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:
	print("Change to level "+level)
	get_tree().call_deferred("change_scene_to_file", level)
	
func destroy(body)->void:
	body.queue_free()