local function isempty(s)
  return s == nil or s == ''
end

minetest.register_node("firesafety:beepybox", {
    description = "Emergency button for fires",
    tiles = {
    "fire_safety_redside.png",
    "fire_safety_redside.png",
    "fire_safety_redside.png",
    "fire_safety_redside.png",
    "fire_safety_redside.png",
    "fire_safety_fire_button.png"},
    groups = {dig_immediate=2},
    paramtype = "light",
    paramtype2 = "facedir",
    drawtype = "nodebox",
    paramtype = "light",
    node_box = {
        type = "fixed",
        fixed = {
            {-0.3125, -0.3125, 0.125, -0.1875, 0.3125, 0.5}, -- NodeBox2
            {-0.1875, -0.25, 0.1875, 0.1875, 0.1875, 0.5}, -- NodeBox3
            {-0.25, 0.1875, 0.125, 0.3125, 0.3125, 0.5}, -- NodeBox4
            {0.1875, -0.3125, 0.125, 0.3125, 0.3125, 0.5}, -- NodeBox5
            {-0.25, -0.3125, 0.125, 0.3125, -0.1875, 0.5}, -- NodeBox6
        }
    },

    digilines = {
        effector = {
            action = function() end
        }
    },

    on_punch = function(pos, node, puncher, pointed_thing)
        if puncher:is_player() then
            print(puncher:get_player_name() .. " pounded the alarm at ")
            print(pos)
        end

        local setchan = minetest.get_meta(pos):get_string("channel")

        print("Sending to " ..  setchan)

        digilines.receptor_send(pos, rules, setchan, "fire")

        -- TODO: store the name of the puncher in somewhere permanent
    end,

    on_construct = function(pos)
        local meta = minetest.get_meta(pos)
        meta:set_string("formspec", "field[channel;Channel;${channel}]")
    end,

    on_receive_fields = function(pos, _, fields, sender)
        local name = sender:get_player_name()
        if minetest.is_protected(pos, name) and not minetest.check_player_privs(name, {protection_bypass=true}) then
            minetest.record_protection_violation(pos, name)
            return
        end
        if (fields.channel) then
            minetest.get_meta(pos):set_string("channel", fields.channel)
        end
    end
})