defmodule Swoosh.Adapters.Mailinator do

  @moduledoc ~S"""
  An adapter that sends email to Mailinator.com service using the SMTP protocol.

  Underneath this adapter uses the
  [gen_smtp](https://github.com/gen-smtp/gen_smtp) library, add it to your mix.exs file.

  ## Example

      # mix.exs
      def deps do
        [
         {:swoosh, "~> 1.3"},
         {:gen_smtp, "~> 1.1"}
        ]
      end

      # config/config.exs
      config :sample, Sample.Mailer,
        adapter: Swoosh.Adapters.Mailinator

      # lib/sample/mailer.ex
      defmodule Sample.Mailer do
        use Swoosh.Mailer, otp_app: :sample
      end

  ## Note

  This adatper relay the email to the Mailinator.com SMTP server, no mater the internet domain of the recipient.

  This service provide no encryption in transit (SSL/TLS) nor authentication.

  This service provide public access to mailboxes.

  Don't use this adapter for confidential information.

  Use for tests only.
"""

  use Swoosh.Adapter, required_config: []

  alias Swoosh.Email
  alias Swoosh.Mailer

  def deliver(%Email{html_body: html, text_body: text} = email, _) when is_nil(html) do
    email |> delegate
  end

  def deliver(%Email{html_body: html, text_body: text} = email, _) when is_nil(text) do
    email |> delegate
  end

  def deliver(%Email{html_body: _, text_body: _} = email, _) do
    email
    |> Map.put(:text_body, nil)
    |> delegate
  end

  def deliver(%Email{text_body: _} = email, _) do
    email
    |> Map.put(:html_body, nil)
    |> delegate
  end

  def deliver(%Email{html_body: _} = email, _) do
    email
    |> Map.put(:text_body, nil)
    |> delegate
  end

  defp delegate(%Email{} = email) do
    email
    |> Mailer.deliver([
      adapter: Swoosh.Adapters.SMTP,
      relay: "mail.mailinator.com",
      port: 25,
      tls: :never,
      auth: :never,
      retries: 1,
      no_mx_lookups: true
    ])
  end
end