def ubuntu_packages(debian_package, timeout=1)
  url = "https://launchpad.net/ubuntu/+search?text=#{debian_package}"
  begin
    page = Nokogiri::HTML(open(url).read)
  rescue
    sleep(timeout)
    retry
  end
  result = []
  page.css("#search-results ul.exact-matches li").each do |exact_match|
    ubuntu_package = exact_match.at_css(".search-result-link").text.strip
    releases = exact_match.at_css(".summary").at_xpath("p[starts-with(text(), 'Available in:')]").text.strip.split("\n").last.split(",").map { |r| r.strip }
    result << { :debian => debian_package, :ubuntu => ubuntu_package, :releases => releases }
  end
  result
end

def ubuntu_versions(release, ubuntu_package, timeout=1)
  url = "https://launchpad.net/ubuntu/#{release}/+source/#{ubuntu_package}"
  begin
    page = Nokogiri::HTML(open(url).read)
  rescue
    sleep(timeout)
    retry
  end
  result = []
  page.css("#portlet-releases .portletContent li").each do |version|
    result << version.at_css("a").text.strip
  end
  result
end

def ubuntu_repository_data(debian_package)
  result = []
  ubuntu_packages(debian_package).each do |pkg|
    versioning_data = {}
    pkg[:releases].each do |release|
      versioning_data[release] = ubuntu_versions(release, pkg[:ubuntu])
    end
    pkg[:releases] = versioning_data
    result << pkg
  end
  result
end

def ubuntu_releases(debian_package, version)
  data = ubuntu_repository_data(debian_package)
  data.map { |d| d[:releases].select { |k,v| v.member? version }.keys }
end