//  AboutDialog.cs
//
// Author:
//   Todd Berman  <tberman@sevenl.net>
//   John Luke  <jluke@cfl.rr.com>
//   Lluis Sanchez Gual  <lluis@novell.com>
//   Viktoria Dudka  <viktoriad@remobjects.com>
//
// Copyright (c) 2004 Todd Berman
// Copyright (c) 2004 John Luke
// Copyright (C) 2008 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;
using System.Text;

using Gdk;
using Gtk;
using GLib;
using Pango;
using System.IO;
using Mono.Unix;
using Pinta.Core;

namespace Pinta
{
	internal class ScrollBox : DrawingArea
	{
		Pixbuf image;
		Pixbuf image_top;
		Pixbuf monoPowered;
		int scroll;
		Pango.Layout layout;
		int monoLogoSpacing = 80;
		int textTop;
		int scrollPause;
		int scrollStart;
		Gdk.GC backGc;

		internal uint TimerHandle;

		string[] authors = new string[] {
			"Jonathan Pobst",
			"Olivier Dufour",
		};

		string[] oldAuthors = new string[] {
			"Aaron Bockover",
			"Anirudh Sanjeev",
			"Greg Lowe",
			"Hanh Pham",
			"Joe Hillenbrand",
			"Jon Rimmer",
			"Jonathan Pobst",
			"Juergen Obernolte",
			"Khairuddin Ni'am",
			"Krzysztof Marecki",
			"Maia Kozheva",
			"Marco Rolappe",
			"Mathias Fussenegger",
			"Obinou Conseil",
			"Olivier Dufour",
			"Richard Cohn"
		};

		public ScrollBox ()
		{
			this.Realized += new EventHandler (OnRealized);
			this.ModifyBg (Gtk.StateType.Normal, new Gdk.Color (49, 49, 74));

			image = PintaCore.Resources.GetIcon ("About.Image.png");
			image_top = PintaCore.Resources.GetIcon ("About.ImageTop.png");
			monoPowered = PintaCore.Resources.GetIcon ("About.MonoPowered.png");

			this.SetSizeRequest (450, image.Height - 1);

			TimerHandle = GLib.Timeout.Add (50, new TimeoutHandler (ScrollDown));
		}

		string CreditText {
			get {
				StringBuilder sb = new StringBuilder ();
				sb.AppendFormat ("<b>{0}</b>\n\n", Catalog.GetString ("Contributors to this Release"));

				for (int n = 0; n < authors.Length; n++) {
					sb.Append (authors[n]);
					if (n % 2 == 1)
						sb.Append ("\n");
					else if (n < authors.Length - 1)
						sb.Append (",  ");
				}

				sb.Append ("\n\n<b>" + Catalog.GetString ("Previous Contributors") + "</b>\n\n");
				for (int n = 0; n < oldAuthors.Length; n++) {
					sb.Append (oldAuthors[n]);
					if (n % 2 == 1)
						sb.Append ("\n");
					else if (n < oldAuthors.Length - 1)
						sb.Append (",  ");
				}

				string trans = Catalog.GetString ("translator-credits");

				if (trans != "translator-credits") {
					sb.AppendFormat ("\n\n<b>{0}</b>\n\n", Catalog.GetString ("Translated by:"));
					sb.Append (trans);
				}

				sb.AppendLine ();
				sb.AppendLine ();
				sb.AppendLine ();
				sb.AppendFormat ("<b>{0}</b>\n", Catalog.GetString ("Based on the work of Paint.NET:"));
				sb.AppendLine ();
				sb.Append ("http://www.getpaint.net/");

				sb.AppendLine ();
				sb.AppendLine ();
				sb.AppendLine ();
				sb.AppendFormat ("<b>{0}</b>\n", Catalog.GetString ("Using some icons from:"));
				sb.AppendLine ();
				sb.AppendLine ("Silk - http://www.famfamfam.com/lab/icons/silk");
				sb.Append ("Fugue - http://pinvoke.com/");

				return sb.ToString ();
			}
		}

		bool ScrollDown ()
		{
			//if (scrollPause > 0) {
			//        if (--scrollPause == 0)
			//                ++scroll;
			//} else
				++scroll;
			int w, h;
			this.GdkWindow.GetSize (out w, out h);
			this.QueueDrawArea (0, 0, w, image.Height);
			return true;
		}

		private void DrawImage ()
		{
			if (image != null) {
				int w, h;
				this.GdkWindow.GetSize (out w, out h);
				this.GdkWindow.DrawPixbuf (backGc, image, 0, 0, (w - image.Width) / 2, 0, -1, -1, RgbDither.Normal, 0,
				0);
			}
		}

		private void DrawImageTop ()
		{
			if (image_top != null) {
				int w, h;
				this.GdkWindow.GetSize (out w, out h);
				this.GdkWindow.DrawPixbuf (backGc, image_top, 0, 0, (w - image.Width) / 2, 0, -1, -1, RgbDither.Normal, 0,
				0);
			}
		}

		private void DrawText ()
		{
			int width, height;
			GdkWindow.GetSize (out width, out height);

			int widthPixel, heightPixel;
			layout.GetPixelSize (out widthPixel, out heightPixel);

			GdkWindow.DrawLayout (Style.WhiteGC, 0, textTop - scroll, layout);
			GdkWindow.DrawPixbuf (backGc, monoPowered, 0, 0, (width / 2) - (monoPowered.Width / 2), textTop - scroll + heightPixel + monoLogoSpacing, -1, -1, RgbDither.Normal, 0, 0);

			heightPixel = heightPixel - 80 + image.Height;

			if ((scroll == heightPixel) && (scrollPause == 0))
				scrollPause = 60;
			if (scroll > heightPixel + monoLogoSpacing + monoPowered.Height + 250)
				scroll = scrollStart;
		}

		protected override bool OnExposeEvent (Gdk.EventExpose evnt)
		{
			int w, h;

			this.GdkWindow.GetSize (out w, out h);
			this.DrawImage ();
			this.DrawText ();
			this.DrawImageTop ();
			
			return false;
		}

		protected void OnRealized (object o, EventArgs args)
		{
			int x, y;
			int w, h;
			GdkWindow.GetOrigin (out x, out y);
			GdkWindow.GetSize (out w, out h);

			textTop = y + image.Height - 30;
			scrollStart = -(image.Height - textTop);
			scroll = scrollStart;

			layout = new Pango.Layout (this.PangoContext);
			// FIXME: this seems wrong but works
			layout.Width = w * (int)Pango.Scale.PangoScale;
			layout.Wrap = Pango.WrapMode.Word;
			layout.Alignment = Pango.Alignment.Center;
			FontDescription fd = FontDescription.FromString ("Tahoma 10");
			layout.FontDescription = fd;
			layout.SetMarkup (CreditText);

			backGc = new Gdk.GC (GdkWindow);
			backGc.RgbBgColor = new Gdk.Color (49, 49, 74);
		}

		protected override void OnDestroyed ()
		{
			base.OnDestroyed ();
			backGc.Dispose ();
		}

	}

	internal class AboutDialog : Dialog
	{
		ScrollBox aboutPictureScrollBox;
		Pixbuf imageSep;

		public AboutDialog () : base (string.Empty, PintaCore.Chrome.MainWindow, DialogFlags.Modal)
		{
			Title = Catalog.GetString ("About Pinta");
			//TransientFor = IdeApp.Workbench.RootWindow;
			AllowGrow = false;
			HasSeparator = false;
			Icon = PintaCore.Resources.GetIcon ("Pinta.png");

			VBox.BorderWidth = 0;

			aboutPictureScrollBox = new ScrollBox ();

			VBox.PackStart (aboutPictureScrollBox, false, false, 0);
			imageSep = PintaCore.Resources.GetIcon ("About.ImageSep.png");

			VBox.PackStart (new Gtk.Image (imageSep), false, false, 0);

			Notebook notebook = new Notebook ();
			notebook.BorderWidth = 6;
			notebook.AppendPage (new AboutPintaTabPage (), new Label (Title));
			notebook.AppendPage (new VersionInformationTabPage (), new Label (Catalog.GetString ("Version Info")));
			
			VBox.PackStart (notebook, true, true, 4);

			AddButton (Gtk.Stock.Close, (int)ResponseType.Close);

			ShowAll ();
		}

		void ChangeColor (Gtk.Widget w)
		{
			w.ModifyBg (Gtk.StateType.Normal, new Gdk.Color (69, 69, 94));
			w.ModifyBg (Gtk.StateType.Active, new Gdk.Color (69, 69, 94));
			w.ModifyFg (Gtk.StateType.Normal, new Gdk.Color (255, 255, 255));
			w.ModifyFg (Gtk.StateType.Active, new Gdk.Color (255, 255, 255));
			w.ModifyFg (Gtk.StateType.Prelight, new Gdk.Color (255, 255, 255));

			Gtk.Container c = w as Gtk.Container;

			if (c != null) {
				foreach (Widget cw in c.Children)
					ChangeColor (cw);
			}
		}

		public new int Run ()
		{
			int tmp = base.Run ();
			GLib.Source.Remove (aboutPictureScrollBox.TimerHandle);
			return tmp;
		}
	}
}