using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Net;
using System.IO;

namespace Weather
{
    class Program
    {
        static void Main(string[] args) 
        {
            if (args.Length == 0)
            {
                DisplayWeather("CHXX0049");
                DisplayInfo();
            }
            else
            {
                switch (args[0].ToLower())
                {
                    case "hongkong":
                    case "hk":
                        DisplayWeather("CHXX0049");
                        break;
                    case "bj":
                    case "beijing":
                        DisplayWeather("CHXX0008");
                        break;
                    case "gz":
                    case "guangzhou":
                        DisplayWeather("CHXX0037");
                        break;
                    case "sz":
                    case "shengzhen":
                        DisplayWeather("CHXX0120");
                        break;
                    case "sh":
                    case "shanghai":
                        DisplayWeather("CHXX0116");
                        break;
                    default:
                        DisplayWeather(args[0]);
                        break;
                }//end of switch
            }
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }

        private static void DisplayInfo()
        {
            Console.WriteLine();
            Console.WriteLine("**************************");
            Console.WriteLine("Weather HongKong     -Hong Kong");
            Console.WriteLine("Weather Beijing      -Beijing");
            Console.WriteLine("Weather Shanghai     -Shanghai");
            Console.WriteLine("Weather Guangzhou    -Guangzhou");
            Console.WriteLine("Weather Shenzhen     -Shenzhen");
            Console.WriteLine("Weather [city code]  -visit details: http://weather.yahoo.com/China/CHXX/regional.html");
            Console.WriteLine();
        }

        private static void DisplayWeather(string cityCode)
        {
            XmlDocument document = new XmlDocument();
            Uri url = new Uri("http://xml.weather.yahoo.com/forecastrss?p="+cityCode );
            //string source = DownloadWebPage(url);
            try
            {
                document.Load(DownloadWebPage(url));
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            XmlNode n=document.SelectSingleNode("/rss/channel/title");
            Console.WriteLine(n.InnerText);
            Console.WriteLine("***********************************************************");
            XmlNodeList nodes = document.GetElementsByTagName("forecast",
                @"http://xml.weather.yahoo.com/ns/rss/1.0");

            foreach (XmlNode node in nodes)
            {
                Console.WriteLine("Date: {0} {1}\nWeather: {2}\nTemperature: {3}C to {4}C",
                    node.Attributes["date"].InnerText,
                    node.Attributes["day"].InnerText,
                    node.Attributes["text"].InnerText,
                    FToC(int.Parse(node.Attributes["low"].InnerText)),