extends Area2D

# TODO: Make a random spawner for invaders
# TODO: Give points if shot

signal shot

const BULLET = preload("res://scenes/bullet.tscn")

@export var move_speed := 100.0
var movement_direction := Vector2.ZERO
var random_position := Vector2.ZERO
var can_shoot := false
var viewport_size : Vector2

func _ready() -> void:
	viewport_size = get_viewport_rect().size

	# I am sorry to who has to make sense of this
	random_position.x = randi_range(1, 2)
	if random_position.x == 2:
		random_position.x = viewport_size.x-1
		movement_direction.x = -1
	else:
		movement_direction.x = 1
	random_position.y = randi_range(32, viewport_size.y + 32)
	position = random_position


func _process(delta: float) -> void:
	position += move_speed * movement_direction * delta

	if can_shoot:
		# FIXME: Proper shoot angle and not able to sudoku
		shoot($GunMarker.global_position, randf_range(90.0, 92.0))

	# "Die", if off screen
	if position.x > viewport_size.x or position.x < 0:
		queue_free()

func _on_flying_tone_finished() -> void:
	$FlyingTone.play()

func _on_body_entered(body: Node2D) -> void:
	if body.is_in_group("ship"):
		body.crash()

func _on_area_entered(area: Area2D) -> void:
	if area.is_in_group("bullet"):
		shot.emit()
	crash()

func shoot(pos : Vector2, rot : float) -> void:
	var bullet := BULLET.instantiate()
	bullet.position = pos
	bullet.rotation = rot
	bullet.life_span = 0.3
	$Projectiles.add_child(bullet)
	$ShootSound.play()
	can_shoot = false
	$ShootTimer.start()

func crash() -> void:
	$AnimationPlayer.play("crash")

func _on_shoot_timer_timeout() -> void:
	can_shoot = true