Module: Ballast::Emoji::Utils

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# File 'lib/ballast/emoji.rb', line 13

module Utils
  attr_accessor :url_mapper

  # Returns the regular expression which matches all the known emojis.
  #
  # @return [Regexp] The regular expression which matches all the known emojis.
  def replace_regex
    @replace_regex ||= /(#{::Emoji.send(:unicodes_index).keys.join("|")})/
  end

  # Replaces all the emojis in the text using the requested mod.
  #
  # @param text [String] The text to manipulate.
  # @param mode [Symbol] The method to use when replacing icons.
  # @param options [Hash] The options to pass to the replacing method.
  # @return [String] The text with all emojis replaced.
  def replace(text, mode: :html, **options)
    mode = :markup unless mode && ::Emoji::Character.new(nil).respond_to?(mode)
    text.ensure_string.gsub(replace_regex) { invoke(::Emoji.find_by_unicode(Regexp.last_match[1]), mode, options) }
  end

  # Lists all the emoji known in a hash.
  #
  # @param keys_method [Symbol] The method to use for keys.
  # @param values_method [Symbol] The method to use for values.
  # @param options [Hash] The options to pass to all methods.
  # @return [Hash] A hash of all known emojis.
  def enumerate(keys_method: :markup, values_method: :html, **options)
    tester = ::Emoji::Character.new(nil)
    keys_method = :markup unless keys_method && tester.respond_to?(keys_method)
    values_method = :html unless values_method && tester.respond_to?(values_method)

    ::Emoji.all.reduce({}) { |accu, icon|
      accu[invoke(icon, keys_method, options)] = invoke(icon, values_method, options)
      accu
    }
  end

  # Returns the URL mapper for the emojis.
  #
  # @return [Proc] The current URL mapper or a default one (which will return the relative URL unmodified).
  def url_mapper
    @url_mapper || ->(url) { url }
  end

  # Returns a absolute URL for a emoji image.
  #
  # @param image [String] The relative URL of the emoji filename.
  # @return [String] The absolute URL of the emoji filename.
  def url_for(image)
    url_mapper.call(image)
  end

  private

  # :nodoc:
  def invoke(subject, method, options)
    subject.method(method).arity == 1 ? subject.send(method, options) : subject.send(method)
  end
end