[LUA] IRC|Server

--[[ term.redirect(peripheral.wrap("back")) ]]--
OtherServers = {}
function Clear()
  term.setCursorPos(1,1)
  term.clear()
end
function tag(tag)
  return "["..tag.."]"
end
function tagView(msg)
  local ReturnMsg = msg
  local ReturnTag = {}
  if string.find(ReturnMsg, "%[") and string.find(ReturnMsg, "%]") then
    while true do
      first = string.find(ReturnMsg, "%[", 1)
      last = string.find(ReturnMsg, "%]", 2)
      if first and last then ReturnTag[#ReturnTag+1] = string.sub(ReturnMsg, first+1, last-1)
        ReturnMsg = string.sub(ReturnMsg, last+1, string.len(msg))
      else
        break
      end
    end
    ReturnTag[#ReturnTag+1] = ReturnMsg
    return unpack(ReturnTag)
  else
    return false
  end
end

function openRednet()
  for _,side in ipairs(rs.getSides()) do
    if peripheral.isPresent(side) and peripheral.getType(side) == "modem" then
      rednet.open(side)
      return side
    end
  end
  error("No modem attached")
end
openRednet()
if fs.exists("ChatSettings/Settings") then
  dofile("ChatSettings/Settings")
else
  write("Server network name. Caps specific!: ")
  ServerName = io.read()
  fs.makeDir("ChatSettings")
  local WriteSettings = io.open("/ChatSettings/Settings","w")
  WriteSettings:write("\nServerName = "..[["]]..ServerName..[["]])
  WriteSettings:close()
  shell.run("clear")
end
Clear()
print("Identifying myself")
Messages = {}
Clients = {}
rednet.broadcast(tag(ServerName).."Im a server!")
TimeOut = os.startTimer(0.5)
while true do
  event,param1,param2 = os.pullEvent()
  if event == "rednet_message" then
    TagOne, TagTwo, TagThree = tagView(param2)
    if TagTwo == "We have the same name! Lets join!" then
      OtherServers[#OtherServers+1] = param1
      rednet.send(param1, "Ok. Im libraryaddict!")
      print("Found a network with the same name! Joining them")
    end
  elseif event == "timer" and param1 == TimeOut then
    break
  end
end

function checkServers(para)
  for n=1,#OtherServers do
    if OtherServers[n] == para then
      return true
    end
  end
  return false
end

function sendServers(para)
  for n=1,#OtherServers do
    rednet.send(OtherServers[n], para)
  end
end
Stored = {}
function checkMessage(para)
  for n=1,10 do
    if Stored[n] == para then
      return true
    end
  end
end

function sendClients(para)
  for n=1,#Clients do
    rednet.send(Clients[n], para)
  end
end

function checkClients(para)
  for n=1,#Clients do
    if Clients[n] == para then
      return true
    end
  end
  return false
end

function setMessage(para)
  for n=1,10 do
    if Stored[n] == nil then
      Stored[n] = para
      if n ~= 10 then
        Stored[n+1] = nil
      else
        Stored[1] = nil
      end
      return true
    end
  end
end
ClientsNA = {}
ServersNA = {}
ClientsName = {}
print("Now acting as a LibChat IRC Server")
function Ping()
  for n=1,#Clients do
    for a=1,#ClientsNA do
      if Clients[n] == ClientsNA[a] then
        sendServers(tag(os.clock()..os.getComputerID())..tag("LibChatServer").."** "..ClientsName[n].." has left the server")
        sendClients(tag("LibChat").."** "..ClientsName[n].." has left the server")
        setMessage(tag(os.clock()..os.getComputerID())..tag("LibChatServer").."** "..ClientsName[n].." has left the server")
        table.remove(Clients, n)
        table.remove(ClientsName, n)
      end
    end
  end
  for n=1,#OtherServers do
    for a=1,#ServersNA do
      if OtherServers[n] == ServersNA[a] then
        table.remove(OtherServers, n)
      end
    end
  end
  ClientsNA = {}
  ServersNA = {}
  for n=1,#Clients do
    ClientsNA[n] = Clients[n]
  end
  for n=1,#OtherServers do
    ServersNA[n] = OtherServers[n]
  end
  for n=1,#Clients do
    rednet.send(Clients[n], "Ping")
  end
  for n=1,#OtherServers do
    rednet.send(OtherServers[n], "Ping")
  end
  Pi = os.startTimer(1)
end

function removeName(para)
  for n=1,#ClientsNA do
    if ClientsNA[n] == para then
      table.remove(ClientsNA, n)
    end
  end
  for n=1,#ServersNA do
    if ServersNA[n] == para then
      table.remove(ServersNA, n)
    end
  end
end
Ping()

function Pig()
  for n=1,#OtherServers do
    rednet.send(OtherServers[n], "Ping")
  end
  Ba = os.startTimer(0.8)
end

function Players()
  Namez = ""
  for n=1,#ClientsName do
    Namez = Namez..ClientsName[n]
    if ClientsName[n+1] then
      Namez = Namez..", "
    end
  end
  if #ClientsName ~= 0 then
    return "People in channel: "..Namez
  else
    return "** Server is empty"
  end
end
Pig()
while true do
  event,param1,param2 = os.pullEvent()
  if param2 == nil then param2 = "" end
  if event == "rednet_message" then
    TagOne, TagTwo, TagThree, TagFour = tagView(param2)
    if TagTwo == "Im a server!" then
      if TagOne == ServerName then
        rednet.send(param1, tag(ServerName).."We have the same name! Lets join!")
      end
    elseif param2 == "Ok. Im libraryaddict!" then
      OtherServers[#OtherServers+1] = param1
      print(param1.." joined the network!")
      for n=1,#ClientsName do
        rednet.send(param1, tag(os.time()..os.getComputerID())..tag("AddPlayer")..tag(n)..ClientsName[n])
      end
    elseif param2 == "Pinger!" then
      rednet.send(param1, tag("LibChat").."Pong!")
    elseif param2 == "Players?" then
      rednet.send(param1, tag("LibChat")..Players())
    elseif TagTwo == "NickChange" then
      for n=1,#ClientsName do
        if Clients[n] == param1 and ClientsName[n] == TagThree and not checkMessage(param2) then
          ClientsName[n] = TagFour
          setMessage(param2)
          sendServers(param2)
          sendClients(tag("LibChat").."** "..TagThree.." is now known as "..TagFour)
        end
      end
    elseif param2 == "Zero Zero Two Nine'r looking for network. Over" then
      rednet.send(param1, tag(ServerName).."We receive and we confirm. Over")
    elseif TagOne == "You are the chosen one" then
      if not checkClients(param1) then
        rednet.send(param1, tag("LibChat")..Players(param1))
        Clients[#Clients+1] = param1
        ClientsName[#ClientsName+1] = TagTwo
        setMessage(tag(os.time()..os.getComputerID())..tag("AddPlayer")..tag(#ClientsName)..TagTwo)
        sendServers(tag(os.time()..os.getComputerID())..tag("AddPlayer")..tag(#ClientsName)..TagTwo)
        print("ComputerID:"..param1.." is now one of my clients")
        setMessage(tag(os.clock()..os.getComputerID())..tag("LibChatServer").."** "..TagTwo.." has joined the server")
        sendServers(tag(os.clock()..os.getComputerID())..tag("LibChatServer").."** "..TagTwo.." has joined the server")
        sendClients(tag("LibChat").."** "..TagTwo.." has joined the server")
        print(TagTwo.." has joined the server")
      end
    elseif param2 == "Pong" then
      removeName(param1)
    elseif param2 == "Ping" then
      rednet.send(param1, "Pong")
    elseif checkServers(param1) and TagTwo == "AddPlayer" then
      if not checkMessage(param2) then
      ClientsName[tonumber(TagThree)] = TagFour
      setMessage(tag(os.time()..os.getComputerID())..tag("AddPlayer")..tag(#ClientsName)..TagThree)
      sendServers(tag(os.time()..os.getComputerID())..tag("AddPlayer")..tag(#ClientsName)..TagThree)
      end
    elseif checkClients(param1) and not checkMessage(param2) then
      local thing = string.gsub(TagThree, "!LeftBracket!", "%]")
      thing = string.gsub(thing, "!RightBracket!", "%[")
      print(thing)
      setMessage(param2)
      sendServers(param2)
      sendClients(tag("LibChat")..TagThree)
    elseif checkServers(param1) and not checkMessage(param2) then
      print(TagThree)
      setMessage(param2)
      sendServers(param2)
      sendClients(tag("LibChat")..TagThree)
    end
  elseif event == "timer" and param1 == Pi then
    Ping()
  elseif event == "timer" and param1 == Ba then
    Pig()
  end
end