# hit_collision_test —— §3.5：__NormalAttackProcess 的碰撞几何 headless 自检。
#   IntersectLineSegments（EterLib/lineintersect_utils.cpp）
#   DetectCollisionDynamicZCylinderVSDynamicZCylinder（GameLib/GameUtil.cpp）
#   .msm AttachingData CollisionType 3 = m_DefendingPointInstanceList
#   godot --headless --path project --script hit_collision_test.gd
extends SceneTree

const HitCollision = preload("res://hit_collision.gd")

var _fail := 0
func _ck(c: bool, m: String) -> void:
	if not c:
		_fail += 1
		printerr("FAIL: " + m)

func _init() -> void:
	_run()
	if _fail == 0:
		print("PASS: hit_collision_test (segments / z-cylinder / msm defending)")
		quit(0)
	else:
		printerr("%d check(s) failed" % _fail)
		quit(1)

func _near(a: Vector3, b: Vector3) -> bool:
	return a.distance_to(b) < 0.01

func _run() -> void:
	# --- IntersectLineSegments ---
	# 静止受击方（L22 < ε²）：OutB = B1，OutA = A 上离 B1 最近点。
	var r: Array = HitCollision.intersect_line_segments(
			Vector3(-100, 0, 0), Vector3(100, 0, 0), Vector3(0, 50, 0), Vector3(0, 50, 0))
	_ck(_near(r[0], Vector3.ZERO) and _near(r[1], Vector3(0, 50, 0)), "stationary B -> nearest on A = (0,0,0)")
	# 退化 A（L11 < ε²）
	r = HitCollision.intersect_line_segments(
			Vector3(10, 10, 0), Vector3(10, 10, 0), Vector3(0, 0, 0), Vector3(100, 0, 0))
	_ck(_near(r[0], Vector3(10, 10, 0)) and _near(r[1], Vector3(10, 0, 0)), "degenerate A -> OutB (10,0,0)")
	# 平行（|DetL| < ε）：两段 clamp 参数取中点
	r = HitCollision.intersect_line_segments(
			Vector3(0, 0, 0), Vector3(100, 0, 0), Vector3(0, 50, 0), Vector3(100, 50, 0))
	_ck(_near(r[0], Vector3(50, 0, 0)) and _near(r[1], Vector3(50, 50, 0)), "parallel -> midpoints (50,0)/(50,50)")
	# 一般情形，s/t 双越界 -> AdjustNearestPoints
	r = HitCollision.intersect_line_segments(
			Vector3(0, 0, 0), Vector3(100, 0, 0), Vector3(200, -50, 0), Vector3(200, 50, 0))
	_ck(_near(r[0], Vector3(100, 0, 0)) and _near(r[1], Vector3(200, 0, 0)), "both out of range -> (100,0)/(200,0)")
	# 参考端 rb = +dot(Lb, AB)（注释里是负号）：两条运动段十字相交时 t 被算成 -0.5，
	# 经 AdjustNearestPoints 夹到 B1。1:1 保留这个出货行为。
	r = HitCollision.intersect_line_segments(
			Vector3(-100, 0, 0), Vector3(100, 0, 0), Vector3(0, -100, 0), Vector3(0, 100, 0))
	_ck(_near(r[0], Vector3.ZERO) and _near(r[1], Vector3(0, -100, 0)),
			"shipped rb sign: crossing moving segments -> OutB clamps to B1, got %s / %s" % [r[0], r[1]])

	# --- DetectCollisionDynamicZCylinderVSDynamicZCylinder ---
	# 攻击球扫过静止受击球：只看扫掠段，不看端点；z（高度）清零。
	_ck(HitCollision.detect_z_cylinder(Vector3(-200, 0, 500), Vector3(200, 0, 500), 20.0,
			Vector3(0, 60, 0), Vector3(0, 60, 0), 70.0), "sweep passes 60cm from victim, r 20+70 -> hit (height ignored)")
	_ck(not HitCollision.detect_z_cylinder(Vector3(-200, 0, 0), Vector3(200, 0, 0), 20.0,
			Vector3(0, 100, 0), Vector3(0, 100, 0), 70.0), "sweep passes 100cm away -> no hit")
	_ck(not HitCollision.detect_z_cylinder(Vector3(-200, 0, 0), Vector3(200, 0, 0), 20.0,
			Vector3(400, 0, 0), Vector3(400, 0, 0), 70.0), "AABB reject -> no hit")
	_ck(HitCollision.detect_z_cylinder(Vector3(0, 0, 0), Vector3(0, 0, 0), 20.0,
			Vector3(80, 0, 900), Vector3(80, 0, 900), 70.0), "static spheres 80cm apart, r sum 90 -> hit")

	# --- .msm 防御球（CollisionType 3），CollisionType 1 = body 不算 ---
	var assets := AssetRoot.path()
	var wolf := assets.path_join("Monster/ymir work/monster/wolf/wolf_blue.msm")
	var ds: Array = HitCollision.parse_msm_defending(wolf)
	_ck(ds.size() == 1, "wolf_blue.msm -> 1 defending sphere, got %d" % ds.size())
	if ds.size() == 1:
		_ck(is_equal_approx(float(ds[0].radius), 90.0) and _near(ds[0].pos, Vector3(0, -15, 80)),
				"wolf defending sphere r90 (0,-15,80), got %s" % [ds[0]])
	var war := assets.path_join("root/msm/warrior_m.msm")
	ds = HitCollision.parse_msm_defending(war)
	_ck(ds.size() >= 1 and is_equal_approx(float(ds[0].radius), 70.0) and _near(ds[0].pos, Vector3(0, 0, 100)),
			"warrior_m.msm defending sphere r70 (0,0,100), got %s" % [ds])
	_ck(HitCollision.parse_msm_defending(assets.path_join("no/such.msm")).is_empty(), "missing msm -> []")
	# IS_HUGE_RACE（InstanceBase.cpp）
	_ck(HitCollision.is_huge_race(2493) and not HitCollision.is_huge_race(101), "IS_HUGE_RACE: only 2493")