//   SparkleShare, an instant update workflow to Git.
//   Copyright (C) 2010  Hylke Bons <hylkebons@gmail.com>
//
//   This program is free software: you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//   GNU General Public License for more details.
//
//   You should have received a copy of the GNU General Public License
//   along with this program. If not, see <http://www.gnu.org/licenses/>.

using Mono.Unix;
using Mono.Unix.Native;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using SparkleLib;
using SparkleLib.Options;
using System.Text;


namespace SparkleShare {

	// This is SparkleShare!
	public class SparkleShare {

		public static SparkleController Controller;
		public static SparkleUI UI;


		// Short alias for the translations
		public static string _ (string s)
		{
			return Catalog.GetString (s);
		}
		

		public static void Main (string [] args)
		{
	
			// Use translations
			Catalog.Init (Defines.GETTEXT_PACKAGE, Defines.LOCALE_DIR);

			
			// Don't allow running as root
			if (new UnixUserInfo (UnixEnvironment.UserName).UserId == 0) {

				Console.WriteLine (_("Sorry, you can't run SparkleShare with these permissions."));
				Console.WriteLine (_("Things would go utterly wrong.")); 

				Environment.Exit (0);

			}

			
			// Parse the command line options
			bool hide_ui   = false;
			bool show_help = false;

			var p = new OptionSet () {
				{ "d|disable-gui", _("Don't show the notification icon"), v => hide_ui = v != null },
				{ "v|version", _("Print version information"), v => { PrintVersion (); } },
				{ "h|help", _("Show this help text"), v => show_help = v != null }
			};

			try {

				p.Parse (args);

			} catch (OptionException e) {

				Console.Write ("SparkleShare: ");
				Console.WriteLine (e.Message);
				Console.WriteLine ("Try `sparkleshare --help' for more information.");

			}

			if (show_help)
				ShowHelp (p);
			
			
			// Load the right controller for the OS
			string controller_name;
			switch (SparkleShare.Platform) {

				case PlatformID.Unix:
					SetProcessName ("sparkleshare");
					controller_name = "Lin";
				break;

				case PlatformID.MacOSX:
					controller_name = "Mac";
				break;
				
				case PlatformID.Win32NT:
					controller_name = "Win";
				break;
				
				default:
					controller_name = "Lin";
				break;

			}


			// Initialize the controller this way so that
			// there aren't any exceptions in the OS specific UI's
			Controller = (SparkleController) Activator.CreateInstance (
				Type.GetType ("SparkleShare.Sparkle" + controller_name + "Controller"));
		
			if (Controller != null && !hide_ui) {

				UI = new SparkleUI ();
				UI.Run ();

			}

		}


		// Prints the help output
		public static void ShowHelp (OptionSet option_set)
		{

			Console.WriteLine (" ");
			Console.WriteLine (_("SparkleShare, an instant update workflow to Git."));
			Console.WriteLine (_("Copyright (C) 2010 Hylke Bons"));
			Console.WriteLine (" ");
			Console.WriteLine (_("This program comes with ABSOLUTELY NO WARRANTY."));
			Console.WriteLine (" ");
			Console.WriteLine (_("This is free software, and you are welcome to redistribute it "));
			Console.WriteLine (_("under certain conditions. Please read the GNU GPLv3 for details."));
			Console.WriteLine (" ");
			Console.WriteLine (_("SparkleShare automatically syncs Git repositories in "));
			Console.WriteLine (_("the ~/SparkleShare folder with their remote origins."));
			Console.WriteLine (" ");
			Console.WriteLine (_("Usage: sparkleshare [start|stop|restart] [OPTION]..."));
			Console.WriteLine (_("Sync SparkleShare folder with remote repositories."));
			Console.WriteLine (" ");
			Console.WriteLine (_("Arguments:"));

			option_set.WriteOptionDescriptions (Console.Out);
			Environment.Exit (0);

		}


		// Prints the version information
		public static void PrintVersion ()
		{

			Console.WriteLine (_("SparkleShare " + Defines.VERSION));
			Environment.Exit (0);

		}


		// Strange magic needed by SetProcessName ()
		[DllImport ("libc")]
		private static extern int prctl (int option, byte [] arg2, IntPtr arg3,	IntPtr arg4, IntPtr arg5);
		
		
		// Sets the Unix process name to 'sparkleshare' instead of 'mono'
		private static void SetProcessName (string name)
		{

			try {

				if (prctl (15, Encoding.ASCII.GetBytes (name + "\0"), IntPtr.Zero, IntPtr.Zero, IntPtr.Zero) != 0) {

					throw new ApplicationException ("Error setting process name: " +
						Mono.Unix.Native.Stdlib.GetLastError ());

				}

			} catch (EntryPointNotFoundException) {

				Console.WriteLine ("SetProcessName: Entry point not found");

			}

		}
		
		
		// Strange magic needed by Platform ()
		[DllImport ("libc")]
		static extern int uname (IntPtr buf);


		// This fixes the PlatformID enumeration for MacOSX in Environment.OSVersion.Platform,
		// which is intentionally broken in Mono for hystorical reasons
		static PlatformID Platform {
			
			get {
		
				IntPtr buf = IntPtr.Zero;
			
				try {
			        
					buf = Marshal.AllocHGlobal (8192);
			       
					if (uname (buf) == 0 && Marshal.PtrToStringAnsi (buf) == "Darwin")
						return PlatformID.MacOSX;
			      
				} catch {
					
				} finally {
			      
					if (buf != IntPtr.Zero)
						Marshal.FreeHGlobal (buf);
	
				}
			
				return Environment.OSVersion.Platform;
	
			}
		
		}
			
	}
	
}