elevator lobby client

local logo = {
  "   ___  ",
  "  / _ \\ ",
  " / , _/",
  "/_/|_/"
}

-- Configuration
local configFileName = "lobby_config.txt"
local computerID = os.getComputerID()
local config = {channel = "", currentFloor = "", computerID = ""}


local modem = peripheral.find("modem")
local monitor = peripheral.wrap("top")
monitor.setTextScale(1)

local elevatorFloor = 0
local lastButtonPress = 0
local cooldown = 2  -- 2-second cooldown
local idleSent = false

-- Save Config to file
local function saveConfig(config)
  local configData = textutils.serializeJSON(config)
  local file = fs.open(configFileName, "w")
  file.write(configData)
  file.close()
end

-- Load Config from file
local function loadConfig()
  if fs.exists(configFileName) then
      local file = fs.open(configFileName, "r")
      local configData = file.readAll()
      file.close()
      local loadedConfig = textutils.unserializeJSON(configData)
      config = loadedConfig
  end
end

local function refreshMonitor()
  monitor.clear()
  monitor.setCursorPos(1, 1)
end

local function centerText(monitor, text)
  local width, height = monitor.getSize()
  local x = math.ceil((width - #text) / 2)
  local y = math.ceil(height / 2)
  monitor.setCursorPos(x, y)
  monitor.write(text)
end

local function displayLogo(monitor, logo, color)
  refreshMonitor()
  monitor.setTextColour(color)
  local _, height = monitor.getSize()
  local yStart = math.ceil(height / 2) - math.ceil(#logo / 2)

  for y, line in ipairs(logo) do
    monitor.setCursorPos(1, yStart + y - 1)
    monitor.write(line)
  end
end

local function chosenDirection(floor, targetFloor)
  if floor < targetFloor then
    return "down"
  elseif floor > targetFloor then
    return "up"
  end
end

local function handleTouch(x, y)
  local currentTime = os.epoch("utc")
  if currentTime - lastButtonPress >= cooldown * 1000 then
      local message = chosenDirection(tonumber(config.currentFloor), elevatorFloor)
      modem.transmit(tonumber(config.channel), tonumber(config.channel) + 1, message)
      lastButtonPress = currentTime
  else
      print("Button press ignored due to cooldown.")
  end
end

local function handleModemMessages(message)
  if string.sub(message, 1, 5) == "idle:" then
      local newFloor = tonumber(string.sub(message, 6))
      print("Elevator floor: " .. newFloor)
      elevatorFloor = newFloor
      if elevatorFloor == tonumber(config.currentFloor) then
          print("Elevator is on this floor.")
          displayLogo(monitor, logo, colours.green)
      else
          print("Elevator is on " .. elevatorFloor)
          displayLogo(monitor, logo, colours.purple)
      end
  end
end


local function mainLoop(config)
  modem.open(tonumber(config.channel))
  while true do
    local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent()
    if event == "modem_message" then
      if senderChannel == tonumber(config.channel) then
        handleModemMessages(message)
      end
    end

    if event == "monitor_touch" then
      handleTouch(x, y)
    end
  end
end

-- Initialization
local function initializeClient()
  loadConfig()
  if not config.channel or config.channel == "" then
      print("Please enter the channel to use:")
      config.channel = tonumber(read())
  end
  if not config.currentFloor or config.currentFloor == "" then
      print("Please enter the current floor:")
      config.currentFloor = tonumber(read())
  end
  if not config.computerID then
      config.computerID = computerID
  end
  saveConfig(config)
  mainLoop(config)
end

-- Entry Point
initializeClient()