extends Node

export (PackedScene) var Tower = preload("res://Tower.tscn");

onready var screen_size = Vector2(ProjectSettings.get("display/window/size/width"), ProjectSettings.get("display/window/size/height"))

export var tower_density = 250

signal spawn

var last_built = 300

var towers = []

func build_tower():
	var tower = Tower.instance()
	tower.connect("exit", 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

func build_all_towers():
	while towers.size() > 0:
		towers.pop_back().queue_free()

	last_built = 300
	while last_built < screen_size.x * 3:
		build_tower()

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

func _on_Tower_exit():
	towers.pop_front()
	build_tower()