# test_bridge_height_parity.gd
# 验证 40250 规范：桥梁与静态物体 (.mdatr) 高度采样 1:1 对齐测试。
# 验证点：
# 1. 在桥梁所在位置，world.sample_height 返回桥面高度（由 .mdatr 中的 height 网格计算），
#    而不是桥下方河床/水面的裸地形高度。
# 2. 桥梁外侧（偏离桥面）的点，正确回退到裸地形采样高度。
# 3. 角色踏上桥梁时，Y 坐标与桥面高度一致，不再掉落穿透到桥底水下。
extends SceneTree

const ASSETS_PATH := "res://../assets"
const MAP_PATH := "OutdoorA1/metin2_map_a1"

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

func _run() -> void:
	print("=== Starting test_bridge_height_parity ===")
	var world: Node = null
	if ClassDB.class_exists("Metin2World"):
		world = ClassDB.instantiate("Metin2World")
	else:
		printerr("FAIL: Metin2World not available")
		quit(1)
		return

	get_root().add_child(world)

	var assets_abs := ProjectSettings.globalize_path(ASSETS_PATH)
	world.set("assets_root", assets_abs)
	world.set("map_path", MAP_PATH)
	world.set("objects_enabled", true)
	world.set("water_enabled", true)
	world.set("load_radius_tiles", -1) # load all chunks

	var ok: bool = bool(world.call("load_map"))
	if not ok:
		printerr("FAIL: load_map failed")
		quit(1)
		return

	# 测试桥梁 1: a1-024-10m-bridge (位于 Chunk 002002)
	# 原始 areadata: x=76156.88 y=-59454.84 z=19693.11 bias=-290.0
	# Godot 坐标: x = 761.57, z = 594.55
	var b1_x := 761.57
	var b1_z := 594.55
	var h1: float = float(world.call("sample_height", b1_x, b1_z))
	print("Bridge 1 (a1-024-10m-bridge) at (%f, %f) sample_height = %f m" % [b1_x, b1_z, h1])

	# 桥面应在 205m ~ 207m 区间，而河床地形在 ~198.2m
	if h1 < 204.0 or h1 > 208.0:
		printerr("FAIL: Bridge 1 deck height expected ~206m, got %f m (fell through to riverbed?)" % h1)
		quit(1)
		return
	print("PASS: Bridge 1 deck height correctly sampled at %f m (> 198.2m riverbed)" % h1)

	# 偏离桥面的点 (向河道侧移 15米): (761.57, 570.0) 应为河床高度 ~198m
	var off_z := 570.0
	var h_off: float = float(world.call("sample_height", b1_x, off_z))
	print("Off-bridge riverbed at (%f, %f) sample_height = %f m" % [b1_x, off_z, h_off])
	if h_off > 202.0:
		printerr("FAIL: Off-bridge point expected riverbed terrain height (< 202m), got %f m" % h_off)
		quit(1)
		return
	print("PASS: Off-bridge point correctly falls back to terrain height %f m" % h_off)

	# 测试桥梁 2: general_obj_suspension bridge01 (位于 Chunk 000002)
	# 原始 areadata: pos=21390.722656 -70045.242188 13467.375000 rot=roll 270.0
	# Godot 坐标: x = 213.91, z = 700.45
	var b2_x := 213.91
	var b2_z := 700.45
	var h2: float = float(world.call("sample_height", b2_x, b2_z))
	print("Bridge 2 (suspension bridge01) at (%f, %f) sample_height = %f m" % [b2_x, b2_z, h2])
	# 悬索吊桥高度采样验证
	if h2 <= 0.0:
		printerr("FAIL: Bridge 2 sample_height returned invalid height %f" % h2)
		quit(1)
		return
	print("PASS: Bridge 2 height correctly sampled at %f m" % h2)

	# 模拟角色走上桥梁：角色位置沿桥梁中轴线前进
	# 桥梁走向从 x=750 到 x=770，z=594.55
	var step_ok := true
	for x_offset in range(-10, 11, 2):
		var test_x := b1_x + float(x_offset)
		var test_h := float(world.call("sample_height", test_x, b1_z))
		if test_h < 203.0:
			printerr("FAIL: Character fell through bridge deck at x=%f! height=%f" % [test_x, test_h])
			step_ok = false
			break
	if not step_ok:
		quit(1)
		return
	print("PASS: Character walking along bridge deck maintained deck elevation across entire span!")

	world.call("unload_map")
	world.queue_free()

	print("ALL BRIDGE HEIGHT PARITY CHECKS PASSED (40250 STRICT)")
	quit(0)