defmodule Mix.Tasks.Enguia.Build do
  @shortdoc "Builds priv/static/enguia.js from assets/js/enguia/"
  @moduledoc """
  Bundles the Enguia JavaScript sources into `priv/static/enguia.js`.

      $ mix enguia.build
      $ mix enguia.build --watch
      $ mix enguia.build --minify
  """

  use Mix.Task

  @impl Mix.Task
  def run(args) do
    {opts, _, _} = OptionParser.parse(args, switches: [watch: :boolean, minify: :boolean])

    script =
      cond do
        opts[:watch] -> "build:watch"
        opts[:minify] -> "build:minified"
        true -> "build"
      end

    Mix.shell().info("Running npm run #{script}...")

    case System.cmd("npm", ["run", script], stderr_to_stdout: true) do
      {output, 0} ->
        Mix.shell().info(output)
        Mix.shell().info("Done.")

      {output, code} ->
        Mix.shell().error(output)
        Mix.raise("enguia.build failed with exit code #{code}")
    end
  end
end