NETWORK_SIDE = "right"
NETWORK_BROADCAST_CHANNEL = 1
NETWORK_LISTEN_CHANNEL = os.getComputerID() % 0xFFFF

MESSAGE_PING = "miner ping"
MESSAGE_INITIALIZE = "miner initialize"
MESSAGE_STATUS = "miner status"
MESSAGE_STATUS_IDLE = "miner status idle"
MESSAGE_DISCONNECT = "miner disconnect"


function Broadcast()
  while true do
    print("Ping...");
    wireless.transmit(NETWORK_BROADCAST_CHANNEL, NETWORK_LISTEN_CHANNEL, MESSAGE_PING);

    for i = 1, #connections do
      print("Asking status on " .. connections[i].channel);
      wireless.transmit(connections[i].channel, NETWORK_LISTEN_CHANNEL, MESSAGE_STATUS);
    end

    os.sleep(3);
  end
end

function UpdateConnections()
  while true do
    local event, side, in_channel, out_channel, message, client_distance = os.pullEvent("modem_message");
    if (message == MESSAGE_INITIALIZE) then
      connections[1 + #connections] = {channel = out_channel, distance = client_distance}
      print("a miner has connected to " .. out_channel);
    end

    local connection
    for i = 1, #connections do
      if (connections[i].channel == out_channel) then
        connection = connections[i]
        break
      end
    end

    if (connection ~= nil) then
      if (message == MESSAGE_STATUS_IDLE) then
        print("Miner " .. out_channel .. " is idle");
      end
    end
  end
end


function EscPress()
  while true do
    local e, key = os.pullEvent("key")
    if key ~= 1 then
     return true
    end
  end
end


wireless = peripheral.wrap(NETWORK_SIDE)
wireless.open(NETWORK_LISTEN_CHANNEL);

connections = {}

parallel.waitForAny(Broadcast,
                    UpdateConnections,
                    EscPress)