defmodule AuthN.UserNotifier do
  @callback deliver_confirmation_instructions(struct, String.t) :: atom
  @callback deliver_reset_password_instructions(struct, String.t) :: atom
  @callback deliver_update_email_instructions(struct, String.t) :: atom

  defp deliver(to, body) do
    require Logger
    Logger.debug(body)
    {:ok, %{to: to, body: body}}
  end

  @doc """
  Deliver instructions to confirm account.
  """
  def deliver_confirmation_instructions(user, url) do
    deliver(user.email, """

    ==============================

    Hi #{user.email},

    You can confirm your account by visiting the url below:

    #{url}

    If you didn't create an account with us, please ignore this.

    ==============================
    """)
  end

  @doc """
  Deliver instructions to reset password account.
  """
  def deliver_reset_password_instructions(user, url) do
    deliver(user.email, """

    ==============================

    Hi #{user.email},

    You can reset your password by visiting the url below:

    #{url}

    If you didn't request this change, please ignore this.

    ==============================
    """)
  end

  @doc """
  Deliver instructions to update your e-mail.
  """
  def deliver_update_email_instructions(user, url) do
    deliver(user.email, """

    ==============================

    Hi #{user.email},

    You can change your e-mail by visiting the url below:

    #{url}

    If you didn't request this change, please ignore this.

    ==============================
    """)
  end
end