if fs.exists("disk/") then
    if fs.exists("disk/.bal") then
    term.clear()
    else
    shell.run("cp", "startup", "disk/.bal")
    end
end

local function script(C, B)
    w = true
    while w do
    print("::::")
    rednet.send(C, "WELCOME ENTER COMMAND OR ?")
    RXID, RX = rednet.receive()
    if RXID == C then
        if B == 0 then
            rednet.send(C, "OUT OF CREDDITS - PLEASE RECONNECT!")
            os.reboot()
        end
        if RX == "?" then
            rednet.send(C, "BAL | IN | OUT | END")
        elseif RX == "BAL" then
            rednet.send(C, B.."creddits")
        elseif RX == "END" then
            rednet.send(C, "Thank you!")
            os.reboot()
        elseif RX == "IN" then
            rednet.send(C, fs.list("disk/")[2])
            if fs.list("disk/")[2] == ".bal" or fs.list("disk/")[2] == "emails" then
            print("")
            else
                fs.delete("disk/"..fs.list("disk/")[2])
            end
        elseif RX == "OUT" then
            rednet.send(C, "TO?")
            z = true
            while z do
            x, y = rednet.receive()
            if x == C then
                TO = y
                rednet.send(C, "MSG?")
                t = true
                while t do
                p, o = rednet.receive()
                if p == C then
                    rednet.send(tonumber(TO), "RE")
                    sleep(1)
                    rednet.send(tonumber(TO), o)
                    print(C.."sent"..o.."to"..TO)
                    B = B - 25
                    rednet.send(C, "DONE")
                    t = false
                    z = false
                else
                end
                end
            else
            end
            end
    else
        rednet.send(RXID, "SERVER IN USE")
    end
    end
    end
end
B = 100
if fs.exists("disk/.bal") then
    PASS = "A"
    print("STARTING!")
    rednet.open("top")
    rednet.broadcast("I AM ALIVE!")
    print(os.time())
    while true do
        shell.run("id")
        print("READY")
        CLIENT, C_MSG = rednet.receive()
        if C_MSG == "LOGIN" then
            print(CLIENT.." is connecting")
            rednet.send(CLIENT, "PSWD?")
            CLI = false
            w = true
            while w do
                X, Y = rednet.receive()
                if X == CLIENT then
                    if PASS == Y then
                        print(CLIENT.." : joined")
                        w = false
                        CLI = true
                        script(CLIENT, B)
                        print("SCRIPT STOPPED")
                        break
                    else
                        print("Wrong pass")
                        rednet.broadcast(CLIENT.."IS BREAKING INTO MY SYSTEM!")
                        w = false
                        break
                    end
                w = false
                break
                end
            end
        elseif C_MSG == "RE" then
            l = true
            while l do
                AA, BB = rednet.receive()
                if AA == CLIENT then
                    shell.run("mkdir disk/emails/")
                    shell.run("cp", "disk/.bal", BB)
                    l = false
                    print("RECIVED EMAILS")
                    break
                end
            end
        end
    end
else
    print("insert disk and reboot!")
end