ua_inspector

defmodule Mix.Tasks.UaInspector.Download do
  @moduledoc """
  Mix task to download database file(s) from your command line.

  ## Arguments

  When run without arguments the task will display the target directory for the
  downloaded files and will ask for confirmation before downloading.

  - `--force`: skip confirmation before downloading
  - `--quiet`: silences task output (does not imply `--force`!)

  ## Informational README

  If you are using the default databases from the default remote location an
  informational README with the filename `ua_inspector.readme.md` will be
  placed next to the downloaded file(s). Inside you will find a link to the
  original database source.

  The creation of this file can be deactivated by configuration:

      config :ua_inspector,
        skip_download_readme: true
  """

  @shortdoc "Downloads database files"

  alias UAInspector.Config
  alias UAInspector.Downloader

  use Mix.Task

  @cli_options [
    aliases: [f: :force],
    strict: [force: :boolean, quiet: :boolean]
  ]

  @impl Mix.Task
  def run(args) do
    :ok = load_app(args)
    :ok = Config.init_env()

    {opts, _argv, _errors} = OptionParser.parse(args, @cli_options)

    unless opts[:quiet] do
      Mix.shell().info("Download path: #{Config.database_path()}")
      Mix.shell().info("This command will replace any existing files!")
    end

    if request_confirmation(opts) do
      perform_download(opts)
    else
      exit_unconfirmed(opts)
    end
  end

  defp exit_unconfirmed(opts) do
    unless opts[:quiet] do
      Mix.shell().info("Download aborted!")
    end

    :ok
  end

  defp perform_download(opts) do
    :ok = Downloader.download(:client_hints)
    :ok = Downloader.download(:databases)
    :ok = Downloader.download(:short_code_maps)
    :ok = Downloader.README.write()

    unless opts[:quiet] do
      Mix.shell().info("Download complete!")
    end

    :ok
  end

  defp request_confirmation(opts) do
    case opts[:force] do
      true -> true
      _ -> Mix.shell().yes?("Download databases?")
    end
  end

  defp load_app(args) do
    _ = Mix.Task.run("loadpaths", args)

    unless "--no-compile" in args do
      _ = Mix.Task.run("compile", args)
    end

    :ok
  end
end