# frozen_string_literal: true

module Html2rss
  module AttributePostProcessors
    ##
    # Returns the URI as String.
    # If the URL is relative, it builds an absolute one with the channel's URL as base.
    #
    # Imagine this HTML structure:
    #
    #    <span>http://why-not-use-a-link.uh </span>
    #
    # YAML usage example:
    #
    #    selectors:
    #      link:
    #        selector: span
    #        extractor: text
    #        post_process:
    #          name: parse_uri
    #
    # Would return:
    #    'http://why-not-use-a-link.uh'
    class ParseUri < Base
      def self.validate_args!(value, context)
        url_types = [String, URI::HTTP, Addressable::URI].freeze

        assert_type(value, url_types, :value, context:)
        assert_type(context.config.url, url_types, :url, context:)

        raise ArgumentError, 'The `value` option is missing or empty.' if value.to_s.empty?
      end

      ##
      # @return [String]
      def get
        config_url = context.config.url

        Html2rss::Utils.build_absolute_url_from_relative(
          Html2rss::Utils.sanitize_url(value),
          config_url
        ).to_s
      end
    end
  end
end