-- The require sweep passing only proves the modules LOAD. What runs on Play is
-- MapBuilder actually building. Execute it for real and capture the error.
local SS = game:GetService("ServerScriptService")
local out = {}
local function say(s) table.insert(out, s) end

local serverScript = SS:FindFirstChild("Server")
local mb
for _, d in ipairs(SS:GetDescendants()) do
	if d:IsA("ModuleScript") and d.Name == "MapBuilder" then mb = d end
end
say("MapBuilder module: " .. (mb and mb:GetFullName() or "NOT FOUND"))
if not mb then return table.concat(out, "\n") end

local ok, mod = pcall(require, mb)
say("require: " .. (ok and "ok" or ("FAIL " .. tostring(mod))))
if not ok then return table.concat(out, "\n") end

say("exports: " .. type(mod))
if type(mod) == "table" then
	local keys = {}
	for k, v in pairs(mod) do table.insert(keys, ("%s(%s)"):format(tostring(k), type(v))) end
	table.sort(keys)
	say("  " .. table.concat(keys, ", "))
end

-- Clear any existing map so we build from scratch, exactly like a fresh run.
local existing = workspace:FindFirstChild("Map")
say("existing Map in workspace: " .. (existing and "yes" or "no"))

local buildFn = type(mod) == "table" and (mod.Build or mod.build or mod.BuildMap)
if type(buildFn) ~= "function" then
	say("NO BUILD FUNCTION EXPORTED -- cannot test build path")
	return table.concat(out, "\n")
end

if existing then existing:Destroy() end
local t0 = os.clock()
local bok, berr = pcall(buildFn)
local dt = os.clock() - t0
say(("build pcall: %s  (%.2fs)"):format(bok and "OK" or "FAIL", dt))
if not bok then
	say("BUILD ERROR: " .. tostring(berr):sub(1, 600))
	return table.concat(out, "\n")
end

local m = workspace:FindFirstChild("Map")
say("Map after build: " .. (m and "present" or "MISSING"))
if m then
	local n = #m:GetDescendants()
	say("descendants: " .. n)
	if n == 0 then say("CONTROL FAIL: map built but empty") end
end

return table.concat(out, "\n")