//
// Copyright (C) 2009 Jordi Mas i Hernandez, jmas@softcatala.org
//
// 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 Gdk;
using Gtk;
using Pango;

using Mistelix.Transitions;
using Mistelix.Core;
using Mistelix.DataModel;
using Mistelix.Widgets;

namespace Mistelix.Core
{
	// DVD Button
	public class Button : ButtonProjectElement // TODO: Should use Dispose pattern
	{
		PixbufImageSurface thumbnail;	
		int imgbox_width, imgbox_height;
		int box_width, box_height;

		public Button ()
		{	

		}

		// TODO: A button belongs to a project and it should be specified in the constructor once
		public Button (int x, int y, int linked_id) : base (x, y, linked_id)
		{
		}

		public override int ThumbnailIndex {
			get { return base.ThumbnailIndex;}
			set { 
				if (base.ThumbnailIndex == value)
					return;

				base.ThumbnailIndex = value;
				InvalidateThumbnail ();
			}
		}

		// Space needed horizontally to represent the object
		public int DrawingBoxWidth {
			get {
				if (ShowAs == ButtonShowAs.Thumbnail)
					return imgbox_width;

				return box_width;
			}
		}

		// Space needed vertically to represent the object
		public int DrawingBoxHeight {
			get {
				if (ShowAs == ButtonShowAs.Thumbnail)
					return imgbox_height;

				return box_height;
			}
		}

		// Check if a point is part of the button
		public bool Contains (int x, int y)
		{
			if ((x >= X && x <= X + DrawingBoxWidth) &&
				(y >= Y && y <= Y + DrawingBoxHeight))
				return true;

			return false;
		}

		// Indicates if the thumbnail is actually created or if the draw operation will need
		// to create it
		public bool IsThumbnailCreated {
			get { return thumbnail != null; }
		}

		public void Draw (Cairo.Context cr, Project project)
		{
			Draw (cr, project, X, Y);
		}

		public void Draw (Cairo.Context cr, Project project, int x, int y)
		{
			if (ShowAs == ButtonShowAs.Thumbnail)
				DrawThumbnail (cr, project, x, y);
			else
				DrawText (cr, project, x, y);
		}

		public void InvalidateThumbnail ()
		{
			if (thumbnail == null)
				return;

			((IDisposable)thumbnail).Dispose ();
			thumbnail = null;
		}

		void DrawThumbnail (Cairo.Context cr, Project project, int x, int y)
		{
			if (thumbnail == null)
				LoadThumbnail (project);
	
			thumbnail.Render (cr, x, y);
		}

		void DrawText (Cairo.Context cr, Project project, int x, int y)
		{
			using (Pango.Layout layout = Pango.CairoHelper.CreateLayout (cr))
			{
				layout.FontDescription = Pango.FontDescription.FromString (project.Details.ButtonsFontName);
				layout.SetMarkup (Text);
				layout.Ellipsize = Pango.EllipsizeMode.End;
				layout.Alignment = Pango.Alignment.Center;
				layout.SingleParagraphMode = true;
				layout.Width = -1;
				layout.GetPixelSize (out box_width, out box_height);

				// Background
				cr.Color = project.Details.ButtonsBackColor;
				cr.Rectangle (x, y, box_width, box_height);
				cr.Fill ();
				cr.Stroke ();

				cr.MoveTo (x, y);				
				cr.Color = project.Details.ButtonsForeColor;
	     			Pango.CairoHelper.ShowLayout (cr, layout);
			}
		}
	
		public void LoadThumbnail (Project project)
		{
			Gdk.Pixbuf pix = null;
			Resolution size;
			Gdk.Pixbuf im;

			size = ThumbnailSizeManager.List [project.Details.ButtonThumbnailSize];

			try  {
				VisibleProjectElement element;

				element = project.ElementFromID (LinkedId);

				if (element is SlideShowProjectElement == false && element is VideoProjectElement == false)
					throw new InvalidOperationException ("Only videos and slideshows allowed");

				if (element is SlideShowProjectElement) {
					SlideShowProjectElement slide;
					string file;

					slide = (SlideShowProjectElement) element;
					file = slide.images[ThumbnailIndex].image;
					im = new Gdk.Pixbuf (file);
				}
				else { // VideoProjectElement
					VideoProjectElement video;

					video = (VideoProjectElement) element;
					im = Backends.GStreamer.Thumbnail.VideoScreenshot (video.filename, ThumbnailIndex);
				}

				int max = Math.Max (im.Width, im.Height);
				Gdk.Pixbuf scaled = im.ScaleSimple (size.Width * im.Width / max, size.Height * im.Height / max, InterpType.Nearest);
				im.Dispose ();
				pix = scaled;

				imgbox_width = pix.Width;
				imgbox_height = pix.Height;
			} 
			catch (Exception e) {
				Logger.Error ("Button.LoadThumbnail. Exception {0}", e.Message);
				pix = Gtk.IconTheme.Default.LoadIcon ("gtk-new", size.Width, (Gtk.IconLookupFlags) 0);
			}
			finally {
				thumbnail = new PixbufImageSurface (pix, true);				
			}
		}
	}
}