defmodule Mix.Tasks.Holo.Test.CheckFileNames do
  @moduledoc """
  Checks if any test scripts have invalid file names.
  File name is valid if it ends with "_test" suffix and has ".exs" extension.
  If there are any invalid file names, the task exits with code 1.
  Support dir and text_helper.exs file are ignored.

  Scripts not adhering to the aforementioned rules wouldn't be picked up by the mix test task.

  ## Examples

      $ mix holo.test.check_file_names test/elixir
  """

  use Mix.Task

  alias Hologram.Commons.FileUtils
  alias Hologram.Commons.PathUtils

  @requirements ["app.config"]

  @doc false
  @impl Mix.Task
  def run(args) do
    args
    |> hd()
    |> find_invalid_file_names()
    |> print_result_and_exit()
  end

  defp find_invalid_file_names(path) do
    path
    |> FileUtils.list_files_recursively()
    |> Enum.reject(
      &(String.ends_with?(&1, "_test.exs") ||
          String.starts_with?(&1, Path.join(path, "support") <> PathUtils.path_separator()) ||
          &1 == Path.join(path, "test_helper.exs"))
    )
  end

  defp green(text) do
    IO.ANSI.green() <> text <> IO.ANSI.reset()
  end

  defp print_result_and_exit([]) do
    "All test scripts have valid file names."
    |> green()
    # credo:disable-for-next-line Credo.Check.Refactor.IoPuts
    |> IO.puts()

    :ok
  end

  defp print_result_and_exit(invalid_file_names) do
    "Found test scripts with invalid file names:"
    |> red()
    # credo:disable-for-next-line Credo.Check.Refactor.IoPuts
    |> IO.puts()

    # credo:disable-for-next-line Credo.Check.Refactor.IoPuts
    Enum.each(invalid_file_names, &IO.puts(red("  * " <> &1)))

    exit({:shutdown, 1})
  end

  defp red(text) do
    IO.ANSI.red() <> text <> IO.ANSI.reset()
  end
end