extends SceneTree
var failures := 0
func _initialize() -> void: call_deferred("run")
func run() -> void:
 var stage := Node3D.new()
 root.add_child(stage)
 StairFlight.build(stage, Vector3.ZERO, 1, 3.7, true, null)
 for data in [[Vector3(0,-0.2,-2), Vector3(8,0.4,4)], [Vector3(0,3.5,9.4),Vector3(8,0.4,4)]]:
  var body := StaticBody3D.new()
  body.position = data[0]
  var box := BoxShape3D.new()
  box.size = data[1]
  var shape := CollisionShape3D.new()
  shape.shape = box
  body.add_child(shape)
  stage.add_child(body)
 var p := CharacterBody3D.new()
 p.floor_snap_length = 0.3
 p.floor_max_angle = deg_to_rad(48)
 var capsule := CapsuleShape3D.new()
 capsule.height = 1.8
 capsule.radius = 0.36
 var collider := CollisionShape3D.new()
 collider.shape = capsule
 collider.position.y = 0.9
 p.add_child(collider)
 stage.add_child(p)
 await physics_frame
 await physics_frame
 for lane in [-0.56,0.0,0.56]:
  p.position = Vector3(lane,0.02,-1.5)
  for tick in 160:
   p.velocity = Vector3(signf(lane) * 1.0, -3, 5.8)
   if lane == 0: p.velocity.x = 0
   p.move_and_slide()
   await physics_frame
  var passed := p.position.z > 7.7 and p.position.y > 3.5
  print("STAIR WALK lane=", lane, " position=", p.position, " passed=", passed)
  if not passed: failures += 1
 stage.queue_free()
 await process_frame
 print("STAIR WALK RESULT ", 3-failures, "/3")
 quit(1 if failures else 0)