defmodule Mix.Tasks.Dockerize do
  use Mix.Task

  def run([path]) when is_binary(path) do
    absolute_path = Path.expand(path)

    cond do
      !File.exists?(absolute_path) ->
        IO.puts("Error: path \"#{path}\" does not exist!")

      !File.dir?(absolute_path) ->
        IO.puts("Error: path \"#{path}\" is not a directory!")

      !File.exists?(Path.join(absolute_path, "mix.exs")) ->
        IO.puts("Error: path \"#{path}\" is not a mix project!")

      true ->
        DockerizeElixir.dockerize(absolute_path)
    end
  end

  def run(_) do
    IO.puts("Usage: mix dockerize path")
  end
end