local update_formspec = function(meta)
	meta:set_string("formspec", "size[8,1;]" ..
		"button_exit[0.1,0.2;8,1;execute;Execute]")
end

minetest.register_node("epic:function", {
	description = "Epic function block: start-block for further epic blocks",
	tiles = epic.create_texture("function", "epic_go.png"),
	paramtype2 = "facedir",
	groups = {cracky=3,oddly_breakable_by_hand=3,epic=1},
	on_rotate = epic.on_rotate,

	epic = {
		on_enter = function(_, _, _, ctx)
			ctx.next()
		end
	},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		update_formspec(meta, pos)
	end,

	on_receive_fields = function(pos, _, fields, sender)
		if not sender then
			return
		end

		if not minetest.check_player_privs(sender, "epic_debug") then
			-- direct call not allowed
			return
		end

		if minetest.is_protected(pos, sender:get_player_name()) then
			-- not allowed
			return
		end

		if fields.execute then
			local name = "function@" .. minetest.pos_to_string(pos)
			epic.execute_epic(sender, pos, name)
		end

	end

})