network = require("network")

event = {}

addr_num = 0
last_msg = nil

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, addr1, addr2, port, dist, msg)
        last_msg = {
            ev=ev,
            addr1=addr1,
            addr2=addr2,
            port=port,
            dist=dist,
            msg=msg,
        }
        callback(ev, addr1, addr2, port, dist, msg)
    end
    network.register(addr, ev_callback)
end

function event.ignore(event, callback)
    if event ~= "modem_message" then
        error("Event '"..event"' is not supported!")
    end
    error("Not implemented yet")
end

function event.pull(event, callback)
    -- Just return the last message and hope it is the
    -- right one ...
    if last_msg == nil then
        error("No previous message found")
    end
    return last_msg.ev, last_msg.addr1, last_msg.addr2, last_msg.port, last_msg.dist, last_msg.msg
end

return event