args = { ... }
peripheral.find("modem", rednet.open)
door_name = os.getComputerLabel() or "door"
open = false
closed = true
side = "back"
relay_mode = false
if #args >= 1 then
    door_name = args[1]
end
for i = 2, #args do
    if string.lower(args[i]) == "inverted" then
        open = true
        closed = false
    elseif string.lower(args[i]) == "back"
      or string.lower(args[i]) == "front"
      or string.lower(args[i]) == "left"
      or string.lower(args[i]) == "right"
      or string.lower(args[i]) == "top"
      or string.lower(args[i]) == "bottom" then
        side = string.lower(args[i])
    else
        print("Using '" .. args[i] .. "' as relay name")
        relay_name = args[i]
        relay_mode = true
    end
end

print("Starting door server for " .. door_name)
rednet.host("door_server", door_name)
while true do
    print("Waiting for command ...")
    local id, msg, _ = rednet.receive("door_server")
    if string.lower(msg) == "open" then
        print("Received open command")
        if relay_mode then
            local relay = peripheral.wrap(relay_name)
            relay.setOutput(side, open)
        else
            redstone.setOutput(side, open)
        end
        rednet.send(id, "Door opened", "door_server")
    elseif string.lower(msg) == "close" then
        print("Received close command")
        if relay_mode then
            local relay = peripheral.wrap(relay_name)
            relay.setOutput(side, closed)
        else
            redstone.setOutput(side, closed)
        end
        rednet.send(id, "Door closed", "door_server")
    elseif string.lower(msg) == "status" then
        print("Received status command")
        local state = "unknown"
        if relay_mode then
            local relay = peripheral.wrap(relay_name)
            if relay.getOutput(side) == open then
                state = "open"
            elseif relay.getOutput(side) == closed then
                state = "closed"
            end
        else
            if redstone.getOutput(side) == open then
                state = "open"
            elseif redstone.getOutput(side) == closed then
                state = "closed"
            end
        end
        rednet.send(id, state, "door_server")
    elseif string.lower(msg) == "help" then
        rednet.send(id, "Available commands:\n  open\n  close\n  status\n  help", "door_server")
    end
end
rednet.unhost("door_server", door_name)
rednet.close()