/**
 * Universal Subscription Mechanism
 * http://www.kbcafe.com/rss/usm.html
 * Author: Randy Charles Morin - http://www.kbcafe.com
 * No warranty. Public domain. Attribution appreciated.
 **/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace kb.rss
{
	/// <summary>
	/// Summary description for UniversalSubscriptionMechanism.
	/// </summary>
	public class UniversalSubscriptionMechanism
	{
		public UniversalSubscriptionMechanism()
		{
		}

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main(string [] args) 
		{
			if (args == null || args.Length == 0)
			{
				Register();
				return;
			}

			try
			{
				System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
				doc.Load(args[0]);
				System.Xml.XmlNamespaceManager nsmgr = new System.Xml.XmlNamespaceManager(doc.NameTable);
				nsmgr.AddNamespace("atom", "http://purl.org/atom/ns#");
				System.Xml.XmlNode node = doc.DocumentElement.SelectSingleNode("//atom:link[@rel='start']", nsmgr);
				if (node != null)
				{
					string url = ((System.Xml.XmlElement)node).GetAttribute("href");
					string title = url;
					node = doc.DocumentElement.SelectSingleNode("//channel/title");
					if (node != null)
					{
						title = ((System.Xml.XmlElement)node).InnerText;
					}

					if (System.Windows.Forms.MessageBox.Show(
						string.Format("Would you like to add {0} to My Yahoo!?", title),
						"Yahoo! USM", System.Windows.Forms.MessageBoxButtons.YesNo,
						System.Windows.Forms.MessageBoxIcon.Question,
						System.Windows.Forms.MessageBoxDefaultButton.Button1)
						!= System.Windows.Forms.DialogResult.Yes)
					{
						return;
					}

					System.Uri uri = new System.Uri(string.Format("http://add.my.yahoo.com/rss?url={0}", url));
					System.Diagnostics.Process.Start(uri.AbsoluteUri);
					return;
				}

				node = doc.DocumentElement.SelectSingleNode("//channel/link");
				if (node != null)
				{
					string url = kb.rss.Discovery.AutoDiscoverRss(((System.Xml.XmlElement)node).InnerText);
					if (url != null)
					{
						string title = url;
						node = doc.DocumentElement.SelectSingleNode("//channel/title");
						if (node != null)
						{
							title = ((System.Xml.XmlElement)node).InnerText;
						}

						if (System.Windows.Forms.MessageBox.Show(
							string.Format("Would you like to add {0} to My Yahoo!?", title),
							"Yahoo! USM", System.Windows.Forms.MessageBoxButtons.YesNo,
							System.Windows.Forms.MessageBoxIcon.Question,
							System.Windows.Forms.MessageBoxDefaultButton.Button1)
							!= System.Windows.Forms.DialogResult.Yes)
						{
							return;
						}

						System.Uri uri = new System.Uri(string.Format("http://add.my.yahoo.com/rss?url={0}", url));
						System.Diagnostics.Process.Start(uri.AbsoluteUri);
						return;
					}
				}

				node = doc.DocumentElement.SelectSingleNode("//atom:feed/atom:link[@rel='alternate']", nsmgr);
				if (node != null)
				{
					string url = kb.rss.Discovery.AutoDiscoverAtom(((System.Xml.XmlElement)node).GetAttribute("href"));
					if (url != null)
					{
						string title = url;
						node = doc.DocumentElement.SelectSingleNode("//atom:feed/atom:title", nsmgr);
						if (node != null)
						{
							title = ((System.Xml.XmlElement)node).InnerText;
						}

						if (System.Windows.Forms.MessageBox.Show(
							string.Format("Would you like to add {0} to My Yahoo!?", title),
							"Yahoo! USM", System.Windows.Forms.MessageBoxButtons.YesNo,
							System.Windows.Forms.MessageBoxIcon.Question,
							System.Windows.Forms.MessageBoxDefaultButton.Button1)
							!= System.Windows.Forms.DialogResult.Yes)
						{
							return;
						}

						System.Uri uri = new System.Uri(string.Format("http://add.my.yahoo.com/rss?url={0}", url));
						System.Diagnostics.Process.Start(uri.AbsoluteUri);
						return;
					}
				}


			}
			catch(System.Exception x)
			{
				System.Windows.Forms.MessageBox.Show(x.Message, "Error", 
					System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error);
			}
		}

		static void Register()
		{
			Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(".rss");
			if (key != null)
			{
				if (System.Windows.Forms.MessageBox.Show("Do you want Yahoo! USM to be your default RSS reader?", 
					"RSS file handler found", System.Windows.Forms.MessageBoxButtons.YesNo, 
					System.Windows.Forms.MessageBoxIcon.Question, System.Windows.Forms.MessageBoxDefaultButton.Button1)
					!= System.Windows.Forms.DialogResult.Yes)
				{
					return;
				};
			}

			key = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey(".rss");
			key.SetValue("", "rssfile");

			key = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey("rssfile");
			key = key.CreateSubKey("shell");
			key = key.CreateSubKey("open");
			key = key.CreateSubKey("command");
			key.SetValue("", string.Format("\"{0}\" \"%1\"", typeof(UniversalSubscriptionMechanism).Assembly.Location));

			key = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey("MIME\\Database\\Content Type");
			Microsoft.Win32.RegistryKey key2 = key.CreateSubKey("application/atom+xml");
			key2.SetValue("Extension", ".rss");
			key2 = key.CreateSubKey("application/rdf+xml");
			key2.SetValue("Extension", ".rss");
			key2 = key.CreateSubKey("application/rss+xml");
			key2.SetValue("Extension", ".rss");
		}

	}
}