class_name SceneManager
extends Node2D

var bullet = preload("res://scenes/bullet.tscn")
var grenade = preload("res://scenes/grenade.tscn")
var bullet_array = []
var total_allowed_bullets : int = 7

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

func _ready() -> void:
	GameController.reset()
	build_level()

func build_level() -> void:
	if coins:
		update_coins()
	
	var _total_enemies : int = 0
	if enemies:
		update_enemies()
	# Wire up signals from GameController
	GameController.level_changed.connect(change_scene)
	GameController.destroyed.connect(destroy)

func update_enemies() -> void:
	var total_enemies : int = 0
	for enemy in enemies.get_children():
		if enemy is Slimer:
			total_enemies = total_enemies + 1
			if not enemy.player_slimed.is_connected(GameController.on_player_slimed):
				enemy.player_slimed.connect(GameController.on_player_slimed)
				GameController.add_enemy_to_level(enemy)

func update_coins() -> void:
	var total_coins : int = 0
	for coin in coins.get_children():
		if coin is Coin:
			print_debug("Adding %s to the total" % str(coin))
			if not coin.coin_collected.is_connected(GameController.on_coin_collected):
				coin.coin_collected.connect(GameController.on_coin_collected)
				print_debug("There are %s coins in the total" % str(total_coins))
			if not coin.tree_exited.is_connected(update_coins):
				coin.tree_exited.connect(update_coins)
			total_coins += 1
	GameController.set_total_coins(total_coins)

func make_bullet(_bullet_position, _bullet_speed) -> void:
	print("make a bullet; put it in the world")
	var my_bullet = bullet_factory()
	my_bullet.transform = _bullet_position
	my_bullet.set_speed(_bullet_speed)
	
func make_grenade(_grenade_position, _grenade_direction) -> void:
	print("SM make a grenade")
	var my_grenade : Grenade = grenade.instantiate()
	GameController.add_child(my_grenade)
	my_grenade.transform = _grenade_position
	my_grenade.apply_central_impulse(Vector2(_grenade_direction, -1) * 200)

func bullet_factory() -> Bullet:
	var my_bullet : Bullet
	if bullet_array.size() < total_allowed_bullets:
		# make a new bullet
		my_bullet = bullet.instantiate()
		my_bullet.bullet_damaged.connect(GameController.bullet_damage)
		owner.add_child(my_bullet)
	else:
		my_bullet = bullet_array.pop_back()
	bullet_array.push_front(my_bullet)
	return my_bullet

func _on_world_boundary_body_entered(body: Node2D) -> void:
	if body is Player:
		var current_scene = get_tree()
		current_scene.call_deferred("reload_current_scene")

func change_scene(level) -> void:
	print_debug("Changing scene to level %s" % level)
	get_tree().call_deferred("change_scene_to_file", level)

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