local network = require("network")
local component = require("component")

local event = {}
local addr_num = 0

function event.listen(event, callback)
  if event ~= "modem_message" then
    error("Event '"..event"' is not supported!")
  end
  addr = "A"..addr_num
  addr_num = addr_num + 1
  function ev_callback(ev, local_addr, ...)
    -- Inject local address so the check passes
    component.modem.address = local_addr
    callback(ev, local_addr, ...)
  end
  network.register(addr, ev_callback)
end

function event.ignore(event, callback)
  if event ~= "modem_message" then
    error("Event '"..event"' is not supported!")
  end
  network.deregister(network.get_scene())
end

function event.pullFiltered(timeout, filter)
  while true do
    local msg = table.pack(network.pull())
    if msg == nil then
      return nil
    elseif filter(table.unpack(msg)) then
      return table.unpack(msg)
    end
  end
end

return event