[CC] Shooting Range Client

local serverid = 559
local sessionName = ""
local sessionData = {}

function verify()
    rednet.open("bottom")
    rednet.send(serverid, ":verify")
    local id, msg = rednet.receive(2)
    if id~=nil then
        return true
    end
    return false
end

function isUser(name)
    rednet.open("bottom")
    rednet.send(serverid, ":user")
    rednet.receive(2)
    rednet.send(serverid, name)
    local id, msg = rednet.receive(2)
    if id~=nil then
        return msg
    end
    return nil
end

function getUserData(name)
    rednet.open("bottom")
    rednet.send(serverid, ":data")
    rednet.receive(2)
    rednet.send(serverid, name)
    local id, msg = rednet.receive(2)
    sessionData = textutils.unserialize(msg)
end

function session()
    print("Please enter your name:")
    sessionName = read()
    print("Please wait...")
    local data = isUser(sessionName)
    if data ~= nil then
        if data == ":newUser" then
            print("Welcome to the shooting range!")
        else
            print("Welcome back "..sessionName.."!")
        end
    else
        return
    end
    getUserData(sessionName)
    print("Your highscore is: "..sessionData.highscore)
end

function main()
    print("Welcome!")
    print("Please wait...")
    if not verify() then
        print("Make sure the computer on the back is on.")
    end
    while not verify() do
        sleep(1)
    end
    session()
end

main()