extends SceneTree

## The greengrocer: do the pyramids build and SETTLE, does produce burst instead of
## shattering, does a collapse crush its own bottom layer, and does the floor get
## slippery.
##   Godot --headless --path game --script dev/probe_grocer.gd

func _initialize() -> void:
	var main: Node = (load("res://main.tscn") as PackedScene).instantiate()
	get_root().add_child(main)
	await process_frame
	main._load_level("grocer")
	for i in 10:
		await physics_frame

	var splat = main.get("_splat")
	var produce := _count("produce")
	print("site      : ", main.get("_plan").level_name())
	print("produce   : %d   glass: %d   total smashables: %d" % [
		produce, _count("glass"), get_nodes_in_group("smashable").size()])

	# --- do the stacks hold? ---
	for i in 120:
		await physics_frame
	var moving := 0
	var total := 0.0
	for n in get_nodes_in_group("smashable"):
		var b := n as RigidBody3D
		if b == null or b.freeze:
			continue
		var v := b.linear_velocity.length()
		total += v
		if v > 0.15:
			moving += 1
	print("after 2s  : %d still moving, total %.2f m/s   (stacks should be at rest)" % [
		moving, total])
	print("survived  : %d produce (spawn crush would show up as losses)" % _count("produce"))

	# --- squash one: does it burst rather than shard? ---
	var before_l: float = splat.litres
	var debris_before := get_nodes_in_group("debris").size()
	var victim: Smashable = null
	for n in get_nodes_in_group("smashable"):
		if (n as Smashable).kind == "produce":
			victim = n
			break
	var at := victim.global_position
	victim.shatter(Vector3.UP)
	await process_frame
	print("squash one: litres %.2f -> %.2f   debris %d -> %d  (must NOT rise: fruit has no shards)" % [
		before_l, splat.litres, debris_before, get_nodes_in_group("debris").size()])

	# --- drop a melon on a pile: does the collapse crush? ---
	var n0 := _count("produce")
	for n in get_nodes_in_group("smashable"):
		var b := n as Smashable
		if b != null and b.kind == "produce":
			b.apply_central_impulse(Vector3(randf_range(-3, 3), 0, randf_range(-3, 3)))
	for i in 150:
		await physics_frame
	print("shoved all: %d -> %d produce   %.1f litres from the collapse" % [
		n0, _count("produce"), splat.litres])

	# --- slippery? ---
	var player = main.get("_player")
	player.global_position = Vector3(at.x, 0.0, at.z)
	await process_frame
	print("slip here : %.2f  (0 = dry floor)" % splat.slip_under_player())
	print("hud       : ", splat.hud_line())

	# --- and none of it leaks to the office ---
	main._load_level("scranton")
	for i in 6:
		await physics_frame
	print("at office : litres %.1f (reset)   produce %d" % [splat.litres, _count("produce")])
	quit()

func _count(kind: String) -> int:
	var n := 0
	for s in get_nodes_in_group("smashable"):
		if (s as Smashable) != null and (s as Smashable).kind == kind:
			n += 1
	return n