require 'yaml'

class Configuration
  # Configurable Options
  #
  # We support a couple of different download methods. The :openuri
  # method utilizes the ruby open-uri library, and provides its own
  # progress bar with no external dependencies. The :wget method, on the
  # other hand, requires GNU Wget (http://www.gnu.org/software/wget/),
  # but will support auto-resume of partially-downloaded files for
  # example.

  USERCONF_PATH = ENV['HOME'] + '/.whatever-dl.conf.yml'
  @dict = {}

  def initialize()
    cfg = default_configuration()

    # Now, load the user configuration which will override the
    # variables defined above.
    begin
      user_config = YAML.load(File.open(USERCONF_PATH))

      # We require ruby-1.9.x now so this should exist.
      cfg.merge!(user_config)

    rescue Errno::ENOENT
      # If the user config file doesn't exist, whatever.
    end

    # Convert all of the keys to symbols.
    cfg = cfg.inject({}){|memo,(k,v)| memo[k.to_sym] = v; memo}

    @dict = cfg
  end

  def method_missing(sym, *args)
    # Replace all missing method calls with dictionary lookups.
    return @dict[sym]
  end


  private;

  def default_configuration()
    d = {}

    d['download_method'] = 'openuri'
    d['user_agent'] = 'whatever-dl'

    return d
  end

end