term.clear()
term.setCursorPos(1,1)

print("ID:",os.getComputerID())

sidez={"top","bottom","left","right","front","back"}
for i=1,6 do
 if peripheral.isPresent(sidez[i]) then
  if peripheral.getType(sidez[i])=="modem" then
   rednet.open(sidez[i]) break
end end end

players = {}

while true do

    event,id,message=os.pullEvent()
    if event=="redstone" and players ~= nil then
        for i=1,#players do
            rednet.send(players[i].HID, 0)
        end
        sleep(2)
    elseif event=="rednet_message" then
        print(event,"|",id,"|",message)
        if message=="register" then
            player = {
                HID = id,
                state = 0
            }

            unique = true

            for i=1,#players do
                if players[i].HID == id then
                   unique = false
                end
            end

            if unique then
                players[#players + 1] = player
                rednet.send(id, "registered")
            end
        elseif message == "reset" then
            print("game reset")
            for i=1,#players do
             rednet.send(players[i].HID, "reset")
            end
        elseif message=="ready" then
            for i=1,#players do
                if players[i].HID == id then
                    players[i].state = 1
                end
            end
        elseif message=="unready" then
            for i=1,#players do
                if players[i].HID == id then
                    players[i].state = 0
                end
            end
        end
    end

    allPlayersReady = true

    for i=1,#players do
        if players[i].state == 0 then
            allPlayersReady = false
        end
    end

    if allPlayersReady then
        for i=1,#players do
            players[i].state = 0
            rednet.send(players[i].HID, "go")
        end
    end
end