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defmodule Pandoc do
  @moduledoc """
  Documentation for `Pandoc`.
  """

  def run(profile, ["--watch" | dirs]) do
    ref =
      __MODULE__.Supervisor
      |> Supervisor.start_child(
        Supervisor.child_spec({Pandoc.Watcher, [profile, dirs: dirs]},
          restart: :transient,
          id: __MODULE__.Watcher
        )
      )
      |> case do
        {:ok, pid} -> pid
        {:error, {:already_started, pid}} -> pid
      end
      |> Process.monitor()

    receive do
      {:DOWN, ^ref, _, _, _} -> :ok
    end
  end

  def run(profile, path) do
    config = Application.get_env(:pandoc, profile)
    args = config[:args] || []

    opts = [
      cd: config[:cd] || File.cwd!(),
      into: IO.stream(:stdio, :line),
      stderr_to_stdout: true
    ]

    args =
      List.update_at(args, -1, fn v ->
        Path.join(
          v,
          path
          |> Path.basename()
          |> String.replace_suffix(".md", ".html")
          |> String.slice(11..-1//1)
        )
      end)

    "pandoc" |> System.cmd(args ++ [path], opts) |> elem(1)
  end
end