extends SceneTree
var failures := 0
func check(ok: bool, label: String) -> void:
	if not ok:
		failures += 1
		if failures < 6: printerr("FAIL: " + label)
func _init() -> void:
	call_deferred("run")
func run() -> void:
	var world = ClassDB.instantiate("Metin2World")
	world.auto_load = false
	world.objects_enabled = false
	world.env_enabled = false
	world.assets_root = AssetRoot.path()
	world.map_path = "OutdoorA1/metin2_map_a1"
	root.add_child(world)
	check(world.load_map(), "real A1 loads")
	var pieces := 0
	var vertices_checked := 0
	var near_shore := 0
	var boundary_vertices := 0
	for mesh in world.find_children("*", "MeshInstance3D", true, false):
		if not String(mesh.name).begins_with("Water"):
			continue
		pieces += 1
		var material: ShaderMaterial = mesh.mesh.surface_get_material(0)
		check(material.shader.code.contains("unshaded") and material.shader.code.contains("ALBEDO = tex;")
			and material.shader.code.contains("ALPHA = COLOR.a;"), "water selects texture RGB / vertex alpha")
		var arrays: Array = mesh.mesh.surface_get_arrays(0)
		var vertices: PackedVector3Array = arrays[Mesh.ARRAY_VERTEX]
		var colors: PackedColorArray = arrays[Mesh.ARRAY_COLOR]
		for i in vertices.size():
			var v := vertices[i]
			# sample_height selects a neighbouring chunk on the outer border;
			# no such chunk exists there. The mesh still has its padded edge data.
			if v.x >= 1024.0 or v.z >= 1280.0:
				boundary_vertices += 1
				continue
			var depth := (v.y - float(world.sample_height(v.x, v.z))) * 100.0
			var expected := clampf(depth / 200.0, 0.0, 0.8) # A1 HeightScale=0.5
			# ArrayMesh stores vertex colors as RGBA8, like legacy diffuse DWORD.
			check(absf(colors[i].a - expected) < 1.0 / 255.0 + 0.0001, "real shoreline depth formula pos=%s actual=%s expected=%s" % [v, colors[i].a, expected])
			if colors[i].a < 0.12: near_shore += 1
			vertices_checked += 1
		for i in range(0, vertices.size(), 4):
			check(absf(vertices[i + 1].x - vertices[i].x - 2.0) < 0.001, "retain every water cell's depth samples")
	check(pieces > 0 and vertices_checked > 0 and near_shore > 0, "water and shallow shoreline exercised")
	world.free()
	await process_frame
	print("water_reference_test: failures=%d pieces=%d vertices=%d shallow=%d boundary_skipped=%d (geometry/material, not 40250 pixels)" % [failures, pieces, vertices_checked, near_shore, boundary_vertices])
	quit(1 if failures else 0)