class News

# File plugins/news.rb, line 84
def self.clean_google_title(title)
  title.to_s.sub(/\s+-\s+[^-]+\z/, "").strip
end

# File plugins/news.rb, line 79
def self.clean_paragraph(html)
  text = Nokogiri::HTML.fragment(html.to_s).text
  text.gsub(/\s+/, " ").strip
end

# File plugins/news.rb, line 20
def self.command_pattern
  /news$/
end

# File plugins/news.rb, line 151
def self.fetch_category_items(category_key, fetch:, limit: ITEMS_PER_CATEGORY)
  config = CATEGORIES.fetch(category_key)
  items = config[:feeds].flat_map do |feed|
    body = fetch.call(feed[:url])
    parse_rss_items(body, source: feed[:source])
  end

  unique_items(items, limit: limit)
end

# File plugins/news.rb, line 135
def self.format_article(title:, paragraph:, source:)
  "[#{source}] #{title} #{paragraph}"
end

# File plugins/news.rb, line 139
def self.format_section(label, items)
  lines = [IrcFormat.divider(label)]
  items.each do |item|
    lines << format_article(
      title: item[:title],
      paragraph: item[:paragraph],
      source: item[:source]
    )
  end
  lines.join("\n")
end

# File plugins/news.rb, line 161
def self.gather_news(fetch:)
  sections = CATEGORIES.filter_map do |key, config|
    items = fetch_category_items(key, fetch: fetch)
    next if items.empty?

    format_section(config[:label], items)
  end

  return "No news found" if sections.empty?

  [
    news_banner,
    *sections,
    IrcFormat.report_footer("ABC · SBS · Google News")
  ].join("\n")
rescue StandardError
  "Could not fetch news"
end

# File plugins/news.rb, line 75
def self.news_banner
  IrcFormat.report_header(tag: "NEWS", title: "News Digest", style: STYLE_BANNER)
end

# File plugins/news.rb, line 96
def self.normalize_item(node, source:)
  title = rss_element_text(node, "title")
  paragraph = rss_element_text(node, "description")
  paragraph = rss_element_text(node, "summary") if paragraph.empty?
  paragraph = rss_element_text(node, "content") if paragraph.empty?

  title = clean_google_title(title) if source == "Google News"
  paragraph = clean_paragraph(paragraph)

  return nil if title.empty? || paragraph.empty?

  { title: title, paragraph: paragraph, source: source }
end

# File plugins/news.rb, line 88
def self.normalize_title(title)
  title.to_s.downcase.gsub(/\s+/, " ").strip
end

# File plugins/news.rb, line 110
def self.parse_rss_items(xml, source:)
  doc = REXML::Document.new(xml.to_s)
  REXML::XPath.match(doc, "//*[local-name()='item' or local-name()='entry']").filter_map do |node|
    normalize_item(node, source: source)
  end
rescue REXML::ParseException, StandardError
  []
end

# File plugins/news.rb, line 92
def self.rss_element_text(node, name)
  REXML::XPath.first(node, ".//*[local-name()='#{name}']")&.text.to_s.strip
end

# File plugins/news.rb, line 119
def self.unique_items(items, limit: ITEMS_PER_CATEGORY)
  seen = {}
  result = []

  items.each do |item|
    key = normalize_title(item[:title])
    next if key.empty? || seen[key]

    seen[key] = true
    result << item
    break if result.length >= limit
  end

  result
end

# File plugins/news.rb, line 188
def execute(m)
  themed_flood_safe_reply(m, gather_news)
end

# File plugins/news.rb, line 184
def fetch_feed(url)
  RabbotHttp.fetch(url, user_agent: USER_AGENT)
end

# File plugins/news.rb, line 180
def gather_news(fetch: method(:fetch_feed))
  self.class.gather_news(fetch: fetch)
end