extends Node3D
class_name HitscanTracer

var speed: float = 300.0 # Extremely fast
var target_position: Vector3
var distance_traveled: float = 0.0
var max_distance: float = 0.0


## Spawn a cel-styled tracer bolt: unshaded hot core with an ink outline,
## flying from origin to target. Shared by every hitscan weapon and the
## remote-fire replay so all bullets look on-theme.
static func spawn_bolt(scene: Node, origin: Vector3, target: Vector3,
		color: Color = Color(1.0, 0.72, 0.15)) -> void:
	if scene == null or origin.distance_squared_to(target) <= 0.1:
		return
	var tracer := HitscanTracer.new()

	var core := MeshInstance3D.new()
	var core_mesh := CapsuleMesh.new()
	core_mesh.radius = 0.025
	core_mesh.height = 1.1
	var m := StandardMaterial3D.new()
	m.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	m.albedo_color = color.lightened(0.35)
	m.emission_enabled = true
	m.emission = color
	m.emission_energy_multiplier = 2.2
	core_mesh.material = m
	core.mesh = core_mesh
	core.rotation.x = deg_to_rad(90) # orient capsule along Z
	core.position = Vector3(0, 0, -0.55) # tail sits at the origin
	core.material_overlay = LevelMaterials.outline(0.004)
	tracer.add_child(core)

	tracer.position = origin
	tracer.target_position = target
	scene.add_child(tracer)
	var up := Vector3.UP
	if absf((target - origin).normalized().dot(up)) > 0.99:
		up = Vector3.RIGHT
	tracer.look_at(target, up)

func _ready() -> void:
	max_distance = global_position.distance_to(target_position)
	if max_distance < 0.1:
		queue_free()

func _physics_process(delta: float) -> void:
	var move_dist = speed * delta
	distance_traveled += move_dist
	
	if distance_traveled >= max_distance:
		# Reached target
		queue_free()
	else:
		global_position += -global_transform.basis.z * move_dist