module BomWarnings

# File lib/bom_warnings.rb, line 13
def fetch_index(fetch: RabbotHttp.method(:fetch))
  fetch.call(INDEX_URL)
end

# File lib/bom_warnings.rb, line 37
def format_report(state:, items:)
  title = state.to_s.strip.empty? ? "Australia" : state.upcase
  header = IrcFormat.report_header(tag: "WARN", title: title, style: STYLE_TITLE)
  if items.empty?
    return [header, "No current warnings found"].join("\n")
  end

  lines = items.map.with_index(1) { |item, index| "#{index}. #{item[:title]}" }
  footer = IrcFormat.report_footer("#{items.length} warnings", "Bureau of Meteorology")
  ([header] + lines + [footer]).join("\n")
end

# File lib/bom_warnings.rb, line 49
def lookup(state: nil, fetch: RabbotHttp.method(:fetch))
  html = fetch_index(fetch: fetch)
  items = parse_warnings(html, state: state)
  format_report(state: state, items: items)
rescue StandardError
  "Could not fetch BOM warnings"
end

# File lib/bom_warnings.rb, line 17
def parse_warnings(html, state: nil)
  doc = Nokogiri::HTML(html.to_s)
  items = doc.css("ul li a, .list li a").map do |link|
    title = link.text.to_s.squeeze(" ").strip
    href = link["href"].to_s
    next if title.empty?

    { title: title, href: href }
  end.compact

  if state
    needle = state.to_s.downcase
    items = items.select do |item|
      item[:title].downcase.include?(needle) || item[:href].downcase.include?(needle)
    end
  end

  items.uniq { |item| item[:title] }.first(8)
end