class ECBRates

# File lib/ecb_rates.rb, line 57
def convert date; date.is_a?(String) ? Date.parse(date).to_s : date.to_s end

# File lib/ecb_rates.rb, line 32
def get_rate_for currency, converted_date
  rates_for_period = Hash.from_xml(get_rates_from_ecb)
  rates_for_chosed_date = rates_for_period["Envelope"]["Cube"]["Cube"].detect { |h| h["time"] == converted_date }
  if rates_for_chosed_date
    rate_with_currency = rates_for_chosed_date["Cube"].detect { |h| h["currency"] == currency }
    if rate_with_currency && rate_with_currency["rate"]
      rate_with_currency["rate"].to_f
    else
      puts "######## Service have no such currency. Check it please. ########"
    end
  else
    puts "######## No rate for this date. May be it was a weekend? ########"
  end
end

# File lib/ecb_rates.rb, line 48
def get_rates_from_ecb
  uri = URI.parse ECB_URL_90
  http = Net::HTTP.new uri.host, uri.port
  request = Net::HTTP::Post.new uri.path
  response = http.request request
  response.body
end

# File lib/ecb_rates.rb, line 22
def rates_for currency, date = Date.today
  converted_date = convert date
  if converted_date > Date.today.to_s
    puts "######## The date should be in the past. ########"
  else
    get_rate_for currency.upcase, converted_date
  end
end