/* NotificationHelper.cs
 *
 * GNOME Do is the legal property of its developers. Please refer to the
 * COPYRIGHT file distributed with this source distribution.
 *  
 * 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 System;

using Gtk;
using Gdk;
using LibNotify = Notifications;
	
namespace Docky.Services
{	
	
	internal class NotificationService
	{
		enum NotificationCapability {
				actions,
				append,
				body,
				body_hyperlinks,
				body_images,
				body_markup,
				icon_multi,
				icon_static,
				image_svg,
				max,
				positioning, // not an official capability
				scaling, // not an official capability
				sound
		}
		
		const string DefaultIconName = "docky";
		
		const int StatusIconSize = 24;
		const int NoteIconSize = 48;
		const int LettersPerWord = 7;
		const int MillisecondsPerWord = 350;
		const int MinNotifyShow = 5000;
		const int MaxNotifyShow = 10000;

		static Pixbuf DefaultIcon;
		static StatusIcon statusIcon;
		
		public static void Initialize ()
		{
			DefaultIcon = DockServices.Drawing.LoadIcon (DefaultIconName, NoteIconSize);
			statusIcon = new StatusIcon ();
			statusIcon.Pixbuf = DockServices.Drawing.LoadIcon (DefaultIconName, StatusIconSize);
			statusIcon.Visible = false;	
		}

		static int ReadableDurationForMessage (string title, string message)
		{
			int t = (title.Length + message.Length) / LettersPerWord * MillisecondsPerWord;	
			return Math.Min (Math.Max (t, MinNotifyShow), MaxNotifyShow);
		}

		public static LibNotify.Notification Notify (string title, string message, string icon)
		{	
			if (ServerIsNotifyOSD ()) {
				return Notify (title, message, icon, Screen.Default, 0, 0);
			}
			
			Screen screen = Screen.Default;
			int x = 0, y = 0;
			
			// if we aren't using notify-osd, show a status icon
			DockServices.System.RunOnMainThread (() => {
				statusIcon.Visible = true;
			});
			
			Rectangle area;
			Orientation orientation;

			statusIcon.GetGeometry (out screen, out area, out orientation);
			x = area.X + area.Width / 2;
			y = area.Y + area.Height - 5;
			
			return Notify (title, message, icon, screen, x, y);
		}
		
		static LibNotify.Notification Notify (string title, string message, string icon, Screen screen, int x, int y)
		{
			LibNotify.Notification notify = ToNotify (title, message, icon);
			notify.SetGeometryHints (screen, x, y);
			notify.Show ();
			
			notify.Closed += delegate {
				DockServices.System.RunOnMainThread (() => statusIcon.Visible = false );
			};
			
			return notify;
		}
		
		static bool SupportsCapability (NotificationCapability capability)
		{
			// positioning and scaling are not actual capabilities, i just know for a fact most other servers
			// support geo. hints, and notify-osd is the only that auto scales images
			if (capability == NotificationCapability.positioning)
				return !ServerIsNotifyOSD ();
			else if (capability == NotificationCapability.scaling)
				return ServerIsNotifyOSD ();
			
			return Array.IndexOf (LibNotify.Global.Capabilities, Enum.GetName (typeof (NotificationCapability), capability)) > -1;
		}

		static LibNotify.Notification ToNotify (string title, string message, string icon)
		{
			LibNotify.Notification notify = new LibNotify.Notification ();
			notify.Body = GLib.Markup.EscapeText (message);
			notify.Summary = title;
			notify.Timeout = ReadableDurationForMessage (title, message);
			
			if (SupportsCapability (NotificationCapability.scaling) && !icon.Contains ("@")) {
				notify.IconName = string.IsNullOrEmpty (icon)
					? DefaultIconName
					: icon;
			} else {
				notify.Icon = string.IsNullOrEmpty (icon)
					? DefaultIcon
					: DockServices.Drawing.LoadIcon (icon, NoteIconSize);
			}

			return notify;
		}
		
		static bool ServerIsNotifyOSD ()
		{
			return LibNotify.Global.ServerInformation.Name == "notify-osd";
		}
	}
}
	
