local function on_place(itemstack, placer, pointed_thing)
    if not minetest.is_player(placer) then
        return minetest.item_place(itemstack, placer, pointed_thing)
    end

    local look_dir = placer:get_look_dir()

    if not vector.check(look_dir) then
        return minetest.item_place(itemstack, placer, pointed_thing)
    end

    local facedir = minetest.dir_to_facedir(look_dir)
    local aim_dir = pointed_thing.under - pointed_thing.above

    local param2 = 20 + math.random(0, 3) -- random rotation for the "upside-down" position
    if aim_dir.y == -1 then
        param2 = 0
    elseif aim_dir.x == 1 then
        param2 = 16
    elseif aim_dir.x == -1 then
        param2 = 12
    elseif aim_dir.z == 1 then
        param2 = 8
    elseif aim_dir.z == -1 then
        param2 = 4
    end

    return minetest.item_place(itemstack, placer, pointed_thing, param2)
end


minetest.register_node("compass_rose:decal", {
        description = "Compass rose decal",
        drawtype = "nodebox",
        use_texture_alpha = "blend",
        tiles = {
            "compass_rose_decal.png",
            "blank.png",
            "blank.png",
            "blank.png",
            "blank.png",
            "blank.png",
        },

        visual_scale = 3.0,
        is_ground_content = false,
        inventory_image = "compass_rose_decal.png",
        wield_image = "compass_rose_decal.png",
        paramtype = "light",
        paramtype2 = "facedir",
        walkable = false,
        climbable = false,
        sunlight_propagates = true,
        node_box = {
            type = "fixed",
            -- shift tiny bit upwards (0.49) to prevent z-fighting
            fixed = {-1.5/3, -0.5/3, -1.5/3, 1.5/3, -0.49/3, 1.5/3}
        },
        selection_box = {
            type = "fixed",
            fixed = {-1.5, -0.45, -1.5, 1.5, -0.5, 1.5}
        },
        groups = {choppy = 3, dig_immediate = 2},
        on_place = on_place,
        on_rotate = false, -- probably disable rotations
})

if core.get_modpath("alphabet") then
    minetest.register_craft({
            type = "shaped",
            output = "compass_rose:decal",
            recipe = {
                {"", "alphabet:n", ""},
                {"alphabet:w", "default:stone_block", "alphabet:e"},
                {"", "alphabet:s", ""},
            }
    })
end