spaceship/enemies/EnemyProjectile.gd

extends Area2D

# Mirrors Projectile.gd, but travels the other direction: fired by an enemy
# component (see EnemyRangedWeaponComponent, #45) and damages player_ships.
# This is the half of ranged combat that never existed before #44 - enemies
# could previously only hurt the fleet by physical contact.

@export var speed: float = 260.0
@export var lifetime: float = 3.0
@export var damage: int = 1
@export var bolt_length: float = 20.0
@export var color: Color = Color(1.0, 0.4, 0.35)

var velocity: Vector2 = Vector2.ZERO
var age: float = 0.0


func _ready() -> void:
	add_to_group("enemy_projectiles")
	area_entered.connect(_on_area_entered)
	queue_redraw()


func launch(direction: Vector2) -> void:
	velocity = direction.normalized() * speed
	rotation = direction.angle() + PI / 2.0


func _physics_process(delta: float) -> void:
	position += velocity * delta
	age += delta
	if age >= lifetime:
		queue_free()


func _on_area_entered(area: Area2D) -> void:
	if area.is_in_group("player_ships"):
		area.take_damage(damage)
		queue_free()
		return
	# #101: structures are targets too. The hitbox is a child Area2D of the
	# Building, which is a plain Node2D and could not be hit otherwise.
	if area.is_in_group("player_buildings"):
		area.take_damage(damage)
		queue_free()


func _draw() -> void:
	var tip: Vector2 = Vector2(0, -bolt_length * 0.6)
	var tail: Vector2 = Vector2(0, bolt_length * 0.4)
	NeonDraw.draw_glowing_line(self, tail, tip, color, 1.0, 0.5)