Kace/godot/scripts/Launcher.gd

extends Node2D

signal get_firing

enum State {
	READY,
	FIRING,
	WAITING,
}

const BULLET_SPEED = 300.0

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

var nbAmmo = 1
var nbStorage = 0

onready var target = $Target
onready var source = $Source
onready var shootDelay = $ShootDelay
onready var grid = $Grid

onready var current_state = State.READY


func _input(event):
	if event is InputEventMouseButton and event.is_pressed() :
		trigger(event.position)


func trigger(aim:Vector2):
	if (current_state == State.READY):
		current_state = State.FIRING
		target.position = aim
		emit_signal("get_firing")


func shoot():
		var bullet = _ballScene.instance()
		bullet.position = source.position
		bullet.linear_velocity = (target.position - source.position).normalized()
		bullet.linear_velocity *= BULLET_SPEED
		bullet.grid = grid
		add_child(bullet)
		bullet.connect("tree_exited", self, "_on_Ball_tree_exited")


func loadBullet(n:int):
	nbStorage += n


func _on_ShootDelay_timeout():
	shoot()
	nbAmmo -= 1
	if (nbAmmo == 0):
		current_state = State.WAITING
	else:
		emit_signal("get_firing")


func _on_Launcher_get_firing():
	shootDelay.start()


func _on_Ball_tree_exited():
	loadBullet(1)
	if (get_tree().get_nodes_in_group("ball").size() == 0):
		current_state = State.READY
		target.position = source.position
		nbAmmo = nbStorage
		nbStorage = 0