noaa_weather.rb

require 'open-uri'
require 'rubygems'
require 'nokogiri'
require 'rest_client'
require 'date'

module NOAA
  WEATHER_URL = 'http://www.weather.gov/forecasts/xml/sample_products/browser_interface/ndfdXMLclient.php'

  def current_weather(zip)
    response = RestClient.get WEATHER_URL, {
      :params => {
        :zipCodeList  => zip,
        :product      => 'time-series',
        :begin        => DateTime.now.to_s,
        :end          => (DateTime.now + 3).to_s,
        :appt         => 'appt',
      }
    }

    parsed_resp = Nokogiri::XML(response)

    times =  parsed_resp.css("time-layout start-valid-time").map do |date_elem|
      DateTime.parse(date_elem.content)
    end
    temps = parsed_resp.css("temperature[type=apparent] value").map do |temp_elem|
      temp_elem.content
    end
    zipped = times.zip(temps)

    dict = zipped.map do |z|
      {
        :time => z[0],
        :temp => z[1],
      }
    end

    return dict
  end
  module_function :current_weather

  def history_weather(station_code)
    url = "http://www.weather.gov/data/obhistory/#{station_code}.html"
    today = Date.today.day
    yesterday = (Date.today - 1).day

    html_doc = Nokogiri::HTML(open(url))
    table = html_doc.css('table')[3]
    rows = table.css('tr[bgcolor!="#b0c4de"]')
    temps = rows.map do |row|
      td = row.css('td')
      p td.to_xml
      date = td[0].content.to_i
      if date == today || date == yesterday then
        if(td[8].content != '') then
          return {
            :max => td[8].content.to_i,
            :min => td[9].content.to_i,
          }
        end
      end
    end
    return temps
  end
  module_function :history_weather

end