defp deps do
  [
    {:ex_ussd, "~> 1.1.0"}
  ]
end

# config/config.exs
# TODO: This are example values, replace them with your own
config :ex_ussd,
 nav: [
   ExUssd.Nav.new(type: :home, name: "HOME", match: "00", reverse: true, orientation: :vertical),
   ExUssd.Nav.new(type: :back, name: "BACK", match: "0", right: 1),
   ExUssd.Nav.new(type: :next, name: "MORE", match: "98")
 ],
 delimiter: ").",
 default_error: "invalid input,try again\n"

defmodule ApiWeb.HomeResolver do
  use ExUssd
  
  def ussd_init(menu, _payload) do
    {:ok, ExUssd.set(menu, title: "Enter your PIN")}
  end

  def ussd_callback(menu, payload, %{attempt: %{count: count}}) do
    if payload.text == "5555" do
      menu =
        menu
        |> ExUssd.set(data: %{name: "John"}) # use payload `phone_number` to fetch the user from DB
        |> ExUssd.set(resolve: &home_rc/2)
      {:ok, menu}
    else
      {:error, "Wrong PIN, #{2 - count} attempt left"}
    end
  end

  def ussd_after_callback(%{error: true} = menu, _payload, %{attempt: %{count: 3}}) do
    menu = 
      menu
      |> ExUssd.set(title: "Account is locked, Dial *234# to reset your account")
      |> ExUssd.set(should_close: true)
    {:ok, menu}
  end

  def home_rc(%ExUssd{data: %{name: name}} = menu, _) do
    menu =  
      menu
      |> ExUssd.set(title: "Welcome #{name}!")
      |> ExUssd.add(ExUssd.new(name: "option 1"))
      |> ExUssd.add(ExUssd.new(name: "option 2"))
      |> ExUssd.set(show_navigation: false) # hide navigation options
    {:ok, menu}
  end
end