-- Why did the building-clip probe return 0 with a 0 control? Diagnose the metric.
local ws = game:GetService("Workspace")
local map = ws:FindFirstChild("Map")

local BUILDING = {
	Building = true,
	TokyoTower = true,
	TowerDeck = true,
	TowerAntenna = true,
	ShiodomeTower = true,
	TowerCrown = true,
	DietTower = true,
	RoppongiHills = true,
	TokyoStation = true,
	StationDome = true,
	Skytree = true,
	GinzaBlock = true,
	NationalDiet = true,
	BridgeTower = true,
	TowerCrossbeam = true,
	Structure = true,
	PalaceWall = true,
}

local ramp, bld = {}, {}
local anyQueryOff, anyCollideOff = 0, 0
for _, d in ipairs(ws:GetDescendants()) do
	if d:IsA("BasePart") then
		if d.Name:find("PAEntryRamp") or d.Name:find("PAExitRamp") then
			table.insert(ramp, d)
		elseif BUILDING[d.Name] then
			table.insert(bld, d)
			if not d.CanQuery then
				anyQueryOff += 1
			end
			if not d.CanCollide then
				anyCollideOff += 1
			end
		end
	end
end

if #bld == 0 then
	return "NO building parts found in Workspace at all (name set wrong?)"
end

-- nearest building to the ramp chain (subsample ramps for speed)
local bd, br, bb = math.huge, nil, nil
for i = 1, #ramp, 7 do
	local r = ramp[i]
	for _, b in ipairs(bld) do
		local dd = (r.Position - b.Position).Magnitude
		if dd < bd then
			bd, br, bb = dd, r, b
		end
	end
end

-- how many buildings are anywhere near the PA at all?
local cen = Vector3.new(-4128, 81, -7438)
local near2000 = 0
for _, b in ipairs(bld) do
	if (b.Position - cen).Magnitude < 2000 then
		near2000 += 1
	end
end

-- does the raw overlap API return ANYTHING for a ramp part? (metric sanity)
local op = OverlapParams.new()
op.MaxParts = 50
local sample = ramp[math.floor(#ramp / 2)]
local hits = ws:GetPartBoundsInBox(sample.CFrame, sample.Size * 1.2, op)
local hn = {}
for i = 1, math.min(#hits, 8) do
	table.insert(hn, hits[i].Name)
end

return ("buildings=%d (CanQuery off=%d, CanCollide off=%d) | nearestBldToRamp=%.0f (%s -> %s @%.0f,%.0f,%.0f) | bldWithin2000ofPA=%d | overlapSanity hits=%d [%s]"):format(
	#bld,
	anyQueryOff,
	anyCollideOff,
	bd,
	br and br.Name or "nil",
	bb and bb.Name or "nil",
	bb and bb.Position.X or 0,
	bb and bb.Position.Y or 0,
	bb and bb.Position.Z or 0,
	near2000,
	#hits,
	table.concat(hn, ",")
)