extends Node3D
## Visible, dodgeable Alien Grunt projectile. Swept ray prevents tunnelling.
const SPEED := 8.0
const LIFETIME := 3.0
var direction := Vector3.FORWARD
var damage := 8.0
var shooter: CharacterBody3D
var player: CharacterBody3D
var age := 0.0
var spent := false

func _ready() -> void:
	add_to_group("boss_projectiles")
	var model: Node3D = preload("res://assets/boss/hornet_textured.scn").instantiate()
	add_child(model)
	for area in model.find_children("*", "Area3D", true, false):
		area.collision_layer = 0
		area.collision_mask = 0
	var anim := model.get_node_or_null("AnimationPlayer") as AnimationPlayer
	if anim != null:
		# The exported native scene already marks idle as looping.
		anim.play("idle")
	var mesh := SphereMesh.new()
	mesh.radius = 0.055
	mesh.height = 0.11
	var glow := StandardMaterial3D.new()
	glow.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	glow.albedo_color = Color(1, 0.7, 0.1)
	mesh.material = glow
	var marker := MeshInstance3D.new()
	marker.mesh = mesh
	marker.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	add_child(marker)
	if direction.length_squared() > 0:
		look_at(global_position + direction)

func _physics_process(dt: float) -> void:
	if spent:
		return
	age += dt
	if age >= LIFETIME or not is_instance_valid(shooter) or shooter.dead \
			or not is_instance_valid(player) or player.hp <= 0:
		queue_free()
		return
	var next := global_position + direction * SPEED * dt
	var query := PhysicsRayQueryParameters3D.create(global_position, next, 1 | 2)
	query.exclude = [shooter.get_rid()]
	var hit := get_world_3d().direct_space_state.intersect_ray(query)
	if not hit.is_empty():
		spent = true
		if hit.collider == player:
			player.take_damage(damage)
		queue_free()
	else:
		global_position = next