Rainy Day CC Clock

local monitorName = "top"
local rainSensor = "right"

--Basic Variables
local textSize = 1
local militaryTime = true
local updateDelay = 2

--Customize Notifications
local dayMessage = "Day"
local nightMessage = "Night"
local clearMessage = "Clear"
local rainMessage = "Storm"

--Used on Advanced Monitors
local timeColor = colors.white
local dayTextColor = colors.lightBlue
local nightTextColor = colors.blue
local dayBackColor = colors.black
local nightBackColor = colors.black
local clearWeatherColor = colors.yellow
local rainyWeatherColor = colors.red

--Used Internally
local monitor = nil
local rainOn = false
local isAm = true
local tTime
local x = 1
local y = 1

local function getSetup()
  print("Connecting to monitor.")
  while monitor == nil do
    monitor = peripheral.wrap(monitorName)
    if monitor == nil then
      print("Waiting for monitor.")
      os.sleep(2)
    end
  end
  print("Monitor found. Establishing base variables.")

  monitor.clear()
  monitor.setTextScale(textSize)
  x, y = monitor.getSize()

  if y < 3 then
    print("Text size too large for current monitor. Please adjust.")
  end
end

local function centerText(cString)
  local sSize = string.len(cString)
  if sSize < x then
    offset = math.floor((x - sSize) / 2) + 1
  else
    offset = 1
  end

  return offset
end

local function formatTime(curTime)
  local curHour = 1
  local curMin = 1
  local strTime = ""

  curHour = math.floor(curTime)
  curMin = math.floor((curTime - curHour) * 60)

  if curHour < 12 then
    isAm = true
  else
    isAm = false
    if militaryTime == false then
      curHour = curHour - 12
    end
  end

  if curMin < 10 then
    curMin = "0"..curMin
  end

  if curHour < 10 then
    strTime = "0"..curHour..":"..curMin
  else
    strTime = tostring(curHour)..":"..curMin
  end

  return strTime
end

getSetup()

if y >= 3 then
  print("Starting main loop.")

  while true do
    tTime = formatTime(os.time())
    if monitor.isColor() then
      if isAm then
        monitor.setBackgroundColor(dayBackColor)
      else
        monitor.setBackgroundColor(nightBackColor)
      end
    end

    monitor.clear()

    if militaryTime == false then
      if isAm then
        tTime = tTime.." AM"
      else
        tTime = tTime.." PM"
      end
    end

    monitor.setCursorPos(centerText(tTime),1)
    if monitor.isColor() then
      monitor.setTextColor(timeColor)
    end
    monitor.write(tTime)

    if os.time() < 6 or os.time() > 18 then
      if monitor.isColor() then
        monitor.setTextColor(nightTextColor)
      end
      monitor.setCursorPos(centerText(nightMessage),2)
      monitor.write(nightMessage)
    else
      if monitor.isColor() then
        monitor.setTextColor(dayTextColor)
      end
      monitor.setCursorPos(centerText(dayMessage),2)
      monitor.write(dayMessage)
    end

    if redstone.getInput(rainSensor) then
      if monitor.isColor() then
        monitor.setTextColor(rainyWeatherColor)
      end
      monitor.setCursorPos(centerText(rainMessage),3)
      monitor.write(rainMessage)
    else
      if monitor.isColor() then
        monitor.setTextColor(clearWeatherColor)
      end
      monitor.setCursorPos(centerText(clearMessage),3)
      monitor.write(clearMessage)
    end

    os.sleep(updateDelay)
  end
end