local username="";

local curPos="1"
local channel="0"
local x,y=term.getSize()
local xzentral=x/2
local yzentral=y/2

function joinChannel()
term.clear()
term.setCursorPos(xzentral-4,yzentral)
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
textutils.slowWrite("Join channel: ")
channel=read()

if channel=="" then term.setCursorPos(12,10) term.clearLine() print("Error: Please enter a Channelname ! ") term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)os.sleep(1) joinChannel() else
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)
term.setCursorPos(xzentral-4,yzentral)
term.clearLine()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.setCursorPos(xzentral-4,yzentral)
textutils.slowWrite("Joining channel...")
os.sleep(1)
rednet.broadcast("*** "..username.." joined the chat ***",channel)
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)

return

end
end





function menu()
fs.delete("/chatfolder")
term.clear()






    if curPos=="1" then

        term.clear()
        term.setCursorPos(xzentral-4,yzentral-1)
        term.setBackgroundColor(colors.white)
        term.setTextColor(colors.black)
        print("Join channel")
        term.setCursorPos(xzentral-4,yzentral)
        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        print("Settings")
        term.setCursorPos(xzentral-4,yzentral+1)
        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        print("Quit")
local event, key=os.pullEvent("key")

        if key==208
            then


                curPos="2" menu()

            elseif key==28
                then
                    joinChannel()
                    return
                    else menu()
        end
    end


    if curPos=="2" then
        term.setBackgroundColor(colors.black)
        term.clear()
        term.setBackgroundColor(colors.black)
        term.setCursorPos(xzentral-4,yzentral-1)
        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        print("Join channel")
        term.setCursorPos(xzentral-4,yzentral)
        term.setBackgroundColor(colors.white)
        term.setTextColor(colors.black)
        print("Settings")
        term.setCursorPos(xzentral-4,yzentral+1)
        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        print("Quit")
        term.setBackgroundColor(colors.black)
    local event, key=os.pullEvent("key")
        if key==200
            then
                curPos="1" menu()


            elseif key==208
                then
                    term.setBackgroundColor(colors.black)
                    curPos="3"
                    menu()

                elseif key==28
                    then
                        nickname()
                        else menu() term.setBackgroundColor(colors.black)
        end
    end


    if curPos=="3" then
        term.clear()
        term.setCursorPos(xzentral-4,yzentral-1)
        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        print("Join channel")
        term.setCursorPos(xzentral-4,yzentral)
        term.setBackgroundColor(colors.black)
        term.setTextColor(colors.white)
        print("Settings")
        term.setCursorPos(xzentral-4,yzentral+1)
        term.setBackgroundColor(colors.white)
        term.setTextColor(colors.black)
        print("Quit")

local event, key=os.pullEvent("key")
            if key==200
                then
                    curPos="2" menu()

                elseif key==28
                    then
                        term.setBackgroundColor(colors.black) term.setTextColor(colors.white) term.clear() term.setCursorPos(xzentral-4,yzentral) textutils.slowPrint("Good Bye") term.setCursorPos(1,1) os.sleep(2) os.shutdown()

else term.clear() term.setBackgroundColor(colors.black)  menu()
            end
    end
end







function close()





local event, button, xPos, yPos = os.pullEvent("mouse_click")

if xPos==50 and yPos==1 then term.clear()    menu()
    else
    end




end



function nickname()
term.clear()
term.setCursorPos(14,10)
write("Username:")
 username=read();
if username=="" then term.setCursorPos(12,10) term.clearLine() print("Error: Please enter a Username ! ") os.sleep(2) nickname() else
term.clear()
term.setCursorPos(12,9)
print("-------------------------------")
term.setCursorPos(12,11)
print("-------------------------------")
term.setCursorPos(16,10)
textutils.slowPrint("Username:"..username.." saved")


os.sleep(2)
end
end


-------------------------------------------------------------------------------------------------------------------
local chat="";



function writetoscreen(text)
term.clear()

local h=fs.open("/chatfolder/chat"..channel,"a")
h.writeLine(text);
h.flush();
h.close();

cursorold()
local g=fs.open("/chatfolder/chat"..channel,"r");

print(g.readAll());
g.close()
end

function oldmessages()


    cursorold()
local l=fs.open("/chatfolder/chat"..channel,"r");

print(l.readAll());
l.close()

end

function writetoscreen_local(text)
term.clear()

local h=fs.open("/chatfolder/chat"..channel,"a")
h.writeLine("["..username.."]"..":"..text);
h.flush();
h.close();

cursorold()
local g=fs.open("/chatfolder/chat"..channel,"r");

print(g.readAll());
g.close()
end


function cursornew()
intx, inty= term.getSize();
term.setCursorPos(1,inty)
end


function cursorold()
term.setCursorPos(1,2)
end




 function getSide()
for _,side in ipairs({"top", "bottom", "front", "left", "right", "back"}) do
    if peripheral.isPresent(side) then if peripheral.getType(side)=="modem" then modemside=side if modemside="" then term.setTextColor(colors.red) term.setCursorPos(xzentral-4,yzentral)print("ERROR:Please attach a modem!") os.shutdown() else rednet.open(modemside)
    end
end
end
end
end




function send ()
cursornew()
term.clearLine()
term.setCursorPos(1,inty-1)
term.setCursorPos(1,1)
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
write("---You are chatting in channel "..channel.."---             ") term.setCursorPos(x-2,1) write("[X]")
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)
term.setCursorPos(1,inty-1)
print("---------------------------------------------------")
cursornew()
write("Text:")
local msg=read();
term.clearLine()
cursornew()
term.clear()
if msg=="" then oldmessages() else
chat=chat..msg
cursorold()
--write(chat)
writetoscreen_local(msg)
rednet.broadcast("["..username.."]"..":"..msg,channel)
cursornew()
term.clearLine()
end
end

function receive()
id,message,protocol=rednet.receive(channel)
cursorold()
chat=chat..message
--write(chat)
writetoscreen(message)
end

fs.delete("chat")
getSide();
nickname()
menu()


term.clear()


while true do

parallel.waitForAny(send,receive,close)
end
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