arch_test

if Code.ensure_loaded?(Igniter.Mix.Task) do
  defmodule Mix.Tasks.ArchTest.Gen.Naming do
    use Igniter.Mix.Task

    @shortdoc "Generate naming convention rules"

    @moduledoc """
    Generates a naming convention architecture test file.

    ## Usage

        mix arch_test.gen.naming

    Creates `test/arch/naming_arch_test.exs` banning `*Manager` and `*God`
    module names and enforcing that Ecto schemas live under a `Schemas` namespace.
    """

    @impl Igniter.Mix.Task
    def igniter(igniter) do
      app = Igniter.Project.Application.app_name(igniter)
      ns = Macro.camelize(to_string(app))
      module = Module.concat([ns, "Naming", "ArchTest"])
      path = "test/arch/naming_arch_test.exs"

      Igniter.create_new_file(igniter, path, """
      defmodule #{inspect(module)} do
        use ExUnit.Case
        use ArchTest, app: #{inspect(app)}

        test "no Manager modules" do
          modules_matching("#{ns}.**.*Manager") |> should_not_exist()
        end

        test "no God modules" do
          modules_matching("#{ns}.**.*God") |> should_not_exist()
        end

        test "Ecto schemas reside under a Schemas namespace" do
          modules_satisfying(fn m -> function_exported?(m, :__schema__, 1) end)
          |> should_reside_under("#{ns}.**.Schemas", allow_empty: true)
        end
      end
      """)
    end
  end
end