# weapon_trace_endpoint_parity_test —— 40250 CWeaponTrace::SetWeaponInstance/Update。
#
# 参考端先按武器包围盒到骨骼原点的最大距离计算 m_fLength，Update 再沿
# 武器局部 Z 轴追加 m_fLength * __GetReachScale()；不是取某个 AABB 角点
# 作为任意方向的刀尖。
extends SceneTree

const WeaponTrace = preload("res://ui/weapon_trace.gd")

var _fail := 0

func _ck(condition: bool, message: String) -> void:
	if not condition:
		_fail += 1
		printerr("FAIL: " + message)

func _init() -> void:
	call_deferred("_run")

func _run() -> void:
	var host := Node3D.new()
	root.add_child(host)
	var weapon := MeshInstance3D.new()
	var box := BoxMesh.new()
	box.size = Vector3(0.2, 0.2, 1.6)
	weapon.mesh = box
	host.add_child(weapon)

	var trace: Node = WeaponTrace.new()
	host.add_child(trace)
	await process_frame
	_ck(trace.attach_to_weapon(weapon), "weapon geometry resolves")

	var expected := sqrt(0.1 * 0.1 + 0.1 * 0.1 + 0.8 * 0.8)
	_ck(is_zero_approx(float(trace._tip_local.x)),
		"reference trace endpoint stays on the local Z axis")
	_ck(is_zero_approx(float(trace._tip_local.y)),
		"reference trace endpoint does not use an arbitrary AABB corner direction")
	_ck(is_equal_approx(float(trace._tip_local.z), expected),
		"reference endpoint uses max bound distance as m_fLength")

	trace.set_reach_scale(1.5)
	var scaled_expected := expected * 1.5
	_ck(is_equal_approx(float(trace._tip_local.z), scaled_expected),
		"__GetReachScale scales the local endpoint length")

	if _fail == 0:
		print("PASS: weapon_trace_endpoint_parity_test (bone-axis length + reach scale)")
		quit(0)
	else:
		printerr("%d check(s) failed" % _fail)
		quit(1)