if Code.ensure_loaded?(Mix.Phoenix) do
  defmodule Mix.Tasks.Temple.Gen.Layout do
    use Mix.Task

    @shortdoc "Generates a default Phoenix layout file in Temple"

    @moduledoc """
    Generates a Phoenix layout file in Temple.
        mix temple.gen.layout
    """
    def run(_args) do
      context_app = Mix.Phoenix.context_app()
      web_prefix = Mix.Phoenix.web_path(context_app)
      binding = [application_module: Mix.Phoenix.base()]

      Mix.Phoenix.copy_from(temple_paths(), "priv/templates/temple.gen.layout", binding, [
        {:eex, "app.html.eex", "#{web_prefix}/templates/layout/app.html.exs"}
      ])

      instructions = """
      A new #{web_prefix}/templates/layout/app.html.exs file was generated.
      """

      Mix.shell().info(instructions)
    end

    defp temple_paths do
      [".", :temple]
    end
  end
end