--[[
	verify_revert.luau -- confirm the reverted convention is in Edit source.
	Reads .Source text (never require(), which caches for the Studio session).
	Asserts the NEW-BAD tokens are ABSENT and the ORIGINAL-GOOD tokens PRESENT,
	so a stale copy fails loudly instead of passing.
]]

local RS = game:GetService("ReplicatedStorage")
local SSS = game:GetService("ServerScriptService")

local function find(name)
	for _, root in ipairs({ SSS, RS, game:GetService("ServerStorage"), workspace }) do
		local m = root:FindFirstChild(name, true)
		if m and m:IsA("ModuleScript") then
			return m
		end
	end
	return nil
end

local out = {}
local pass, fail = 0, 0
local function check(label, cond, detail)
	if cond then
		pass += 1
		table.insert(out, string.format("  %-34s OK    %s", label, detail or ""))
	else
		fail += 1
		table.insert(out, string.format("  %-34s FAIL  %s", label, detail or ""))
	end
end

local cm = find("CarManager")
local ch = find("Chassis")
if not cm or not ch then
	return "FATAL: CarManager or Chassis not found in Edit"
end

local cmSrc = cm.Source
local chSrc = ch.Source

table.insert(out, string.format("CarManager  %d bytes  %s", #cmSrc, cm:GetFullName()))
check("isFront reverted to zSign < 0", cmSrc:find("isFront = zSign < 0", 1, true) ~= nil, "")
check("bad zSign > 0 GONE", cmSrc:find("isFront = zSign > 0", 1, true) == nil, "")
check("shell solver back on -Z", cmSrc:find("atan2(nose.X, -nose.Z)", 1, true) ~= nil, "")
check("bad solver GONE", cmSrc:find("atan2(-nose.X, nose.Z)", 1, true) == nil, "")
check("regression warning recorded", cmSrc:find("made things strictly worse", 1, true) ~= nil, "")

table.insert(out, string.format("Chassis     %d bytes  %s", #chSrc, ch:GetFullName()))
check("DRIVE_SIGN reverted to -1", chSrc:find("DRIVE_SIGN = -1", 1, true) ~= nil, "")
check("bad DRIVE_SIGN = 1 GONE", chSrc:find("DRIVE_SIGN = 1 ", 1, true) == nil, "")

table.insert(out, "")
table.insert(out, string.format(">>> %d passed, %d failed", pass, fail))
if fail > 0 then
	table.insert(out, ">>> REVERT INCOMPLETE -- do not press Play")
else
	table.insert(out, ">>> Revert confirmed in Edit source. Save (Ctrl+S) before Play.")
	table.insert(out, "    NOTE: this proves the SOURCE is reverted. It does NOT prove the")
	table.insert(out, "    cars render correctly -- only your eyes in Play can show that.")
end

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