extends Node

@onready var screen_size = Vector2(ProjectSettings.get("display/window/size/viewport_width"), ProjectSettings.get("display/window/size/viewport_height"))

# Tower variables
@export var Tower = preload("res://Tower.tscn"); # Tower scene
@export var tower_density = 250 # How often a tower should be added
var last_built = 300 # Helper variable to adhear the tower density
var towers = []

signal spawn # A tower is spawned in

# Build a single tower
func build_tower():
	var tower = Tower.instantiate()
	tower.connect("exit", Callable(self, "_on_Tower_exit"))

	var pos = Vector2(last_built, (randf() * (screen_size.y * 0.7)) + screen_size.y * 0.15)  # The player's movement vector.
	
	tower.position = pos
	towers.append(tower)
	
	emit_signal("spawn", tower.get_global_transform().get_origin().x)
	add_child(tower)
	last_built += tower_density

# Build all towers
func build_all_towers():
	get_tree().call_group("tower", "queue_free")
	last_built = 300
	while last_built < screen_size.x * 3:
		build_tower()

func _ready():
	# Connect signals
	var ui = get_node("UI")
	var player = get_node("Player")
	player.connect("start", Callable(self, "build_all_towers"))
	player.connect("start", Callable(ui, "_on_Player_start"))
	player.connect("hit", Callable(ui, "_on_Player_hit"))
	player.connect("passed", Callable(ui, "_on_Player_passed"))
	connect("spawn", Callable(player, "_on_Tower_spawn"))
	randomize()

func _on_Tower_exit():
	build_tower()