module RssFilter

# File lib/rss_filter.rb, line 31
def apply(items, link_filter:)
  filter = normalize_page_url(link_filter)
  return items if filter.nil? || filter.empty?

  items.select { |item| item_matches?(item, filter) }
end

# File lib/rss_filter.rb, line 21
def item_matches?(item, link_filter)
  filter = normalize_page_url(link_filter)
  return true if filter.nil? || filter.empty?

  needle = filter.downcase
  [item[:link], item[:guid]].map { |value| normalize_page_url(value).to_s.downcase }.any? do |haystack|
    !haystack.empty? && (haystack.include?(needle) || needle.include?(haystack))
  end
end

# File lib/rss_filter.rb, line 14
def normalize_page_url(url)
  value = UrlLink.normalize_url(url)
  return nil unless UrlLink.valid_url?(value)

  value.chomp("/")
end