require 'toml'

module RevealCK
  #
  # Public: A Config knows about the core configuration values of a
  # RevealCK Presentation: title, author, theme, etc. It knows about
  # sensible defaults, and it can read these from a toml file.
  #
  class Config

    def initialize(args = {})
      config_file = args[:config_file]
      @config = load_config config_file
    end

    def title
      @config['title']
    end

    def author
      @config['author']
    end

    def theme
      @config['presentation']['theme']
    end

    private

    DEFAULTS = {
      'title' => 'Slides',
      'author' => 'Hakim El Hattab',
      'presentation' => {
        'theme' => 'default'
      }
    }

    def load_config(config_file)
      config = DEFAULTS.dup
      if config_file && File.exists?(config_file)
        file_config = TOML.load_file config_file
        config.merge! file_config
      end
      config
    end

  end
end