Wireless Chat (OpenComputers) - FIXED

local com = require("component")
local event = require("event")
local unicode = require("unicode")
local computer = require("computer")
local gpu = com.gpu
local w, h = gpu.getViewport()
local scren_buffer = {}
local text_buffer = ""
local theme = 1
local modem,tunnel
local nick,port


local function connect()
  io.write("Ник:")
  nick = io.read()
  io.write("Код чата:")
  port = io.read()
end

connect()

gpu.fill(1, 1, w, h, " ")
gpu.set(w / 2 - 3, 1, "Чат")
gpu.set(1, 5, "Enter -- Отправить сообщение")
gpu.set(1, 6, "Alt   -- Смена темы")
gpu.set(1, 7, "Ctrl  -- Выход")
gpu.set(1, h, "> ")

if com.isAvailable("tunnel") then
  modem = com.tunnel
  tunnel = true
  gpu.set(1, h-1, "Cвязь через связанную плату")
elseif com.isAvailable("modem") then
  modem = com.modem
  modem.open(tonumber(port))
  tunnel = false
  gpu.set(1, h-1, "Cвязь через модем, порт "..port)
else
  os.execute("cls")
  print("нет связанной платы или модема")
  os.exit()
end

local function refresh()
  gpu.fill(1, 1, w, h, " ")
  for i, v in ipairs(scren_buffer) do
    gpu.set(1, h-1-i, v)
  end
  gpu.set(1, h, "> "..text_buffer)
  if #scren_buffer > h then
    table.remove(scren_buffer)
  end
end

local function receive(_,_,_,_,_,message)
  table.insert(scren_buffer,1,"< "..message)
  refresh()
  computer.beep(1600, 0.1)
end

local function keydown()
  local e,_,char,key = event.pull(1,"key_down")
  if e == "key_down" then
    if key == 28 or key == 156 then--Enter
      if unicode.len(text_buffer) > 0 then
        table.insert(scren_buffer,1,"> "..text_buffer)
        if tunnel then
          modem.send(nick .. ": " .. text_buffer)
        else
          modem.broadcast(tonumber(port),nick .. ": " .. text_buffer)
        end
        text_buffer = ""
        refresh()
        return
      end
    elseif key == 29 or key == 157 then--Ctrl
      event.ignore("modem_message", receive)
      gpu.setResolution(w, h)
      gpu.setBackground(0x000000)
      gpu.setForeground(0xFFFFFF)
      os.execute("cls")
      os.exit()
    elseif key == 56 or key == 184 then--Alt
      theme = theme + 1
      if theme == 5 then
        theme = 1
      end
      if theme == 1 then
        gpu.setBackground(0x000000)
        gpu.setForeground(0xFFFFFF)
      elseif theme == 2 then
        gpu.setForeground(0x000000)
        gpu.setBackground(0xFFFFFF)
      elseif theme == 3 then
        gpu.setForeground(0xFF8000)
        gpu.setBackground(0x000000)
      elseif theme == 4 then
        gpu.setForeground(0x000000)
        gpu.setBackground(0x008000)
      end
      refresh()
    elseif key == 14 then--Backspace
      text_buffer = unicode.sub(text_buffer,0,unicode.len(text_buffer)-1)
    elseif key == 211 then--Del
      text_buffer = ""
    elseif key == 42 or key == 54 then--Shift
      --игнорировать нажатие
    elseif unicode.len(text_buffer) <= w-3 then
      text_buffer = text_buffer..unicode.char(char)
    end
    blink = false
    gpu.set(1, h, "> "..text_buffer)
    gpu.fill(unicode.len(text_buffer)+3, h, w, 1, " ")
  end
  pos = unicode.len(text_buffer)+3
  blink = not blink
  if blink then
    gpu.set(pos,h,"█")
  else
    gpu.set(pos,h," ")
  end
end

event.listen("modem_message", receive)
while true do
  keydown()
end