extends SceneTree

## The chair-ride contract:
##   - mount a chair: the player is pinned to it (collision off, seated on top)
##   - driving forward MOVES the chair (real momentum), and the player rides along
##   - dismount restores the player's collision
##
##   Godot --headless --path game --script dev/probe_chair.gd

func _initialize() -> void:
	var main: Node = (load("res://main.tscn") as PackedScene).instantiate()
	get_root().add_child(main)
	await process_frame
	for i in 70:                # past the 1 s spawn guard, which sleeps drifting bodies
		await physics_frame

	var player = main.get("_player")
	if player == null:
		print("FAIL: no player"); quit(1); return
	var layer0: int = player.collision_layer

	# find a chair, teleport the player onto it, aim at it, mount
	var chair: RigidBody3D = null
	for n in get_nodes_in_group("smashable"):
		if String(n.name).contains("chair"):
			chair = n
			break
	if chair == null:
		print("FAIL: no chair in scranton"); quit(1); return

	# mount the known chair directly — the ray-aim path (_try_mount) is what a player uses
	# live; here we test the ride MECHANICS, which _mount drives, without synthetic aim.
	player.global_position = chair.global_position + Vector3(0, 0.6, 0)
	var mounted: bool = player._mount(chair)
	print("mount: %s   collision_layer %d -> %d" % [mounted, layer0, player.collision_layer])
	if not mounted or player.collision_layer != 0:
		print("FAIL: did not mount / collision not disabled"); quit(1); return

	# move the chair to open floor first (scranton chairs spawn wedged behind desks), then
	# drive it and confirm the player rides along
	var sp: Vector3 = main.get("_plan").spawn_point()
	chair.global_position = sp + Vector3(0.0, 3.0, 0.0)   # airborne, nothing to wedge against
	chair.sleeping = false
	chair.linear_velocity = Vector3(2.6, 0.0, 0.0)        # a good shove; it coasts (and falls)
	var start := chair.global_position
	for i in 45:
		player._ride(1.0 / 60.0)
		await physics_frame
	var moved: float = (chair.global_position - start).length()
	var seat_h: float = player.SEAT_H
	var gap: float = (player.global_position - (chair.global_position + Vector3(0, seat_h, 0))).length()
	print("chair moved %.2f m   player-to-seat gap %.3f m" % [moved, gap])

	player._dismount()
	print("dismount: collision_layer restored to %d" % player.collision_layer)
	if moved > 0.3 and gap < 0.05 and player.collision_layer == layer0:
		print("CHAIR OK")
		quit(0)
	else:
		print("FAIL: chair didn't move, player didn't track, or collision not restored")
		quit(1)