local HttpService = game:GetService("HttpService")
local RS = game:GetService("ReplicatedStorage")
local Circuit = require(RS:WaitForChild("Shared"):WaitForChild("Circuit"))
local map = workspace:FindFirstChild("Map")
if not map then return "no Map" end

-- Aggregate PA parts EXCLUDING the slips we just built, so we can see the lot.
local agg = { xMin = math.huge, xMax = -math.huge, zMin = math.huge, zMax = -math.huge }
local names = {}
local biggest, biggestArea = nil, 0
for _, d in ipairs(map:GetDescendants()) do
	if d:IsA("BasePart") and d.Name:sub(1, 2) == "PA" and not d.Name:find("Slip") then
		names[d.Name] = (names[d.Name] or 0) + 1
		agg.xMin = math.min(agg.xMin, d.Position.X - d.Size.X / 2)
		agg.xMax = math.max(agg.xMax, d.Position.X + d.Size.X / 2)
		agg.zMin = math.min(agg.zMin, d.Position.Z - d.Size.Z / 2)
		agg.zMax = math.max(agg.zMax, d.Position.Z + d.Size.Z / 2)
		local area = d.Size.X * d.Size.Z
		if area > biggestArea then
			biggestArea = area
			biggest = ("%s size=(%d,%d,%d) pos=(%d,%d,%d) yTop=%.1f"):format(
				d.Name, d.Size.X, d.Size.Y, d.Size.Z,
				d.Position.X, d.Position.Y, d.Position.Z,
				d.Position.Y + d.Size.Y / 2)
		end
	end
end

local nameList = {}
for n, c in pairs(names) do
	table.insert(nameList, n .. "x" .. c)
end
table.sort(nameList)
-- cap the list so the payload can't truncate
local head = {}
for i = 1, math.min(#nameList, 40) do head[i] = nameList[i] end

local s = Circuit.samples
local function probe(i)
	local a, b = s[i], s[i + 1]
	local d = (b.pos - a.pos)
	local fwd = Vector3.new(d.X, 0, d.Z).Unit
	local right = fwd:Cross(Vector3.yAxis)
	return ("s%d pos=(%d,%d) fwd=(%.2f,%.2f) right=(%.2f,%.2f)"):format(
		i, a.pos.X, a.pos.Z, fwd.X, fwd.Z, right.X, right.Z)
end

return HttpService:JSONEncode({
	pa_nonslip_bounds = { x = { math.floor(agg.xMin), math.floor(agg.xMax) }, z = { math.floor(agg.zMin), math.floor(agg.zMax) } },
	biggest_pa_part = biggest,
	distinct_pa_names = #nameList,
	sample_names = head,
	pa_center = tostring(Circuit.PA_CENTER),
	joins = { probe(525), probe(537), probe(551), probe(539) },
})