class_name Launcher
extends Node2D


signal get_firing
signal is_full
signal gain_new_bullet
signal interrupt_wave
signal move_visor


enum State {
	READY,
	FIRING,
	WAITING,
	INTERRUPTING,
	DEAD
}


const visor_min_heigth = 10
const visor_start_shift = Vector2(0, -visor_min_heigth)

const Ball = preload("res://component/entity/ball/Ball.tscn")


export (float) var bullet_speed = 500.0
export (float) var visor_ratio = 1.0


var nbAmmo := 0
var nbStorage := 1
var current_state = State.WAITING


onready var target = $TargetLine
onready var visor = $TargetLine/TargetVisor
onready var source = $Source
onready var shootDelay = $ShootDelay


func _ready() -> void:
	get_ready()


func _input(event: InputEvent) -> void:
	if event is InputEventMouseButton and event.is_pressed():
		trigger(event.position)
	elif event is InputEventMouseMotion and current_state == State.READY:
		aim_at(event.position)


func aim_at(cursor: Vector2) -> void:
	var visor_pos = (cursor - source.position) * visor_ratio
	if abs(visor_pos.y) > visor_min_heigth:
		visor.position = visor_pos
		emit_signal("move_visor")


func trigger(aim: Vector2) -> void:
	if (current_state == State.READY):
		current_state = State.FIRING
		emit_signal("get_firing")
	elif (current_state == State.WAITING):
		current_state = State.INTERRUPTING
		emit_signal("interrupt_wave")


func shoot() -> void:
		var bullet = Ball.instance()
		bullet.position = source.position
		bullet.linear_velocity = (target.get_visor_pos() - source.position).normalized()
		bullet.linear_velocity *= bullet_speed
		add_child(bullet)
		bullet.connect("tree_exited", self, "_on_Ball_tree_exited")
		self.connect("interrupt_wave", bullet, "_on_Launcher_interrupt_wave")


func gain_new_bullet() -> void:
	load_bullet(1)
	emit_signal("gain_new_bullet")


func load_bullet(n: int) -> void:
	nbStorage += n


func end_of_round() -> void:
	if (current_state != State.DEAD):
		get_ready()


func get_ready() -> void:
	current_state = State.READY
	target.set_visor_pos(source.position + visor_start_shift)
	nbAmmo = nbStorage
	nbStorage = 0


func die() -> void:
	current_state = State.DEAD


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


func _on_Launcher_get_firing() -> void:
	shootDelay.start()


func _on_Ball_tree_exited() -> void:
	if get_tree() == null:
		return # Game is exiting

	load_bullet(1)
	if (get_tree().get_nodes_in_group("ball").size() == 0):
		emit_signal("is_full")


func _on_Grid_has_moved() -> void:
	end_of_round()


func _on_Grid_kace_broken() -> void:
	gain_new_bullet()


func _on_DeadLine_game_lost() -> void:
	die()