/*
 * FSpot.OpenWithMenu
 *
 * Author(s)
 * 	Loz  <gnome2@flower.powernet.co.uk>
 * 	Gabriel Burt  <gabriel.burt@gmail.com>
 * 	Larry Ewing  <lewing@novell.com>
 * 	Stephane Delcroix  <stephane@delcroix.org>
 *
 * This is free software. See COPYING for details.
 */

using System;
using System.Collections;
using System.Runtime.InteropServices;
using Gtk;
using Gdk;
using Gnome.Vfs;
using Mono.Unix;

namespace FSpot.Extensions {
	public class OpenWithMenu: Gtk.Menu {
		public delegate void OpenWithHandler (MimeApplication app);
		public event OpenWithHandler ApplicationActivated;
	
		public delegate string [] MimeFetcher ();
		private MimeFetcher mime_fetcher;
	
		private string [] mime_types;
		private bool populated = false;
		
		private string ignore_app = null;
		public string IgnoreApp {
			get { return ignore_app; }
			set { ignore_app = value; }
		}
	
		private bool show_icons = false;
		public bool ShowIcons {
			get { return show_icons; }
			set { show_icons = value; }
		}
	
		private bool hide_invalid = true;
		public bool HideInvalid {
			get { return hide_invalid; }
			set { hide_invalid = value; }
		}
	
		static OpenWithMenu () {
			Gnome.Vfs.Vfs.Initialize ();
		}
	
		public OpenWithMenu (MimeFetcher mime_fetcher)
		{
			this.mime_fetcher = mime_fetcher;
		}
		
		public void Populate (object sender, EventArgs args)
		{
			string [] mime_types = mime_fetcher ();
	
			//foreach (string mime in mime_types)
			//	System.Console.WriteLine ("Populating open with menu for {0}", mime);
			
			if (this.mime_types != mime_types && populated) {
				populated = false;
	
				Widget [] dead_pool = Children;
				for (int i = 0; i < dead_pool.Length; i++)
					dead_pool [i].Destroy ();
			}
	
			if (populated)
				return;
	
			ArrayList union, intersection;
			ApplicationsFor (this, mime_types, out union, out intersection);
	
			ArrayList list = (HideInvalid) ? intersection : union;
	
			foreach (MimeApplication app in list) {
				//System.Console.WriteLine ("Adding app {0} to open with menu (binary name = {1}", app.Name, app.BinaryName);
				//System.Console.WriteLine ("Desktop file path: {0}, id : {1}", app.DesktopFilePath);
				AppMenuItem i = new AppMenuItem (this, app);
				i.Activated += HandleItemActivated;
				// Make it not sensitive it we're showing everything
				i.Sensitive = (HideInvalid || intersection.Contains (app));
				Append (i);
			}
			
			if (Children.Length == 0) {
				MenuItem none = new Gtk.MenuItem (Catalog.GetString ("No applications available"));
				none.Sensitive = false;
				Append (none);
			}
	
			ShowAll ();
	
			populated = true;
		}
	
		private static void ApplicationsFor (OpenWithMenu menu, string [] mime_types, out ArrayList union, out ArrayList intersection)
		{
			//Console.WriteLine ("Getting applications");
			union = new ArrayList ();
			intersection = new ArrayList ();
			
			if (mime_types == null || mime_types.Length < 1)
				return;
	
			bool first = true;
			foreach (string mime_type in mime_types) {
				if (mime_type == null)
					continue;
	
				MimeApplication [] apps = Gnome.Vfs.Mime.GetAllApplications (mime_type);
				for (int i = 0; i < apps.Length; i++) {
					apps [i] = apps [i].Copy ();
				}
	
				foreach (MimeApplication app in apps) {
					// Skip apps that don't take URIs
					if (! app.SupportsUris ())
						continue;
					
					// Skip apps that we were told to ignore
					if (menu.IgnoreApp != null)
						if (app.BinaryName.IndexOf (menu.IgnoreApp) != -1)
							continue;
	
					if (! union.Contains (app))
						union.Add (app);
					
					if (first)
						intersection.Add (app);
				}
	
				if (! first) {
					for (int i = 0; i < intersection.Count; i++) {
						MimeApplication app = intersection [i] as MimeApplication;
						if (System.Array.IndexOf (apps, app) == -1) {
							intersection.Remove (app);
							i--;
						}
					}
				}
	
				first = false;
			}
		}
		
		private void HandleItemActivated (object sender, EventArgs args)
		{
			AppMenuItem app = (sender as AppMenuItem);
	
			if (ApplicationActivated != null)
				ApplicationActivated (app.App);
		}
		
		private class AppMenuItem : ImageMenuItem {
			public MimeApplication App;
	
			public AppMenuItem (OpenWithMenu menu, MimeApplication mime_application) : base (mime_application.Name)
			{
				App = mime_application;
				
				if (menu.ShowIcons) {
					if (mime_application.Icon != null) {
						Gdk.Pixbuf pixbuf = null; 
	
						try {
							if (mime_application.Icon.StartsWith ("/"))
								pixbuf = new Gdk.Pixbuf (mime_application.Icon, 16, 16);
							else 
								pixbuf = IconTheme.Default.LoadIcon (mime_application.Icon,
												     16, (IconLookupFlags)0);
						} catch (System.Exception) {
							pixbuf = null;
						}
	
						if (pixbuf != null)
							Image = new Gtk.Image (pixbuf);
					}
				}
			}
		}
	}
}