-- startup.lua : Bay Sign Renderer (single monitor)
-- Reads config from "bay.cfg"

local mon = peripheral.find("monitor")
if not mon then error("No monitor attached") end

-- ---- settings ----
local TEXT_SCALE = 0.5 -- change to 1.0 if you want bigger text
-- ------------------

local function readCfg(path)
  if not fs.exists(path) then
    error("Missing config file: " .. path)
  end
  local h = fs.open(path, "r")
  local data = h.readAll()
  h.close()
  local ok, cfg = pcall(textutils.unserialize, data)
  if not ok or type(cfg) ~= "table" then
    error("Invalid bay.cfg (must be a serialized table)")
  end
  return cfg
end

local cfg = readCfg("bay.cfg")

mon.setTextScale(TEXT_SCALE)
mon.setBackgroundColor(colors.black)
mon.clear()

local w, h = mon.getSize()

local function center(y, text, color)
  if y < 1 or y > h then return end
  if #text > w - 2 then
    text = string.sub(text, 1, w - 5) .. "..."
  end
  mon.setCursorPos(math.floor((w - #text) / 2) + 1, y)
  mon.setTextColor(color or colors.white)
  mon.write(text)
end

local function frame()
  mon.setTextColor(colors.gray)
  for x = 1, w do
    mon.setCursorPos(x, 1) mon.write("═")
    mon.setCursorPos(x, h) mon.write("═")
  end
  for y = 1, h do
    mon.setCursorPos(1, y) mon.write("║