//
// Copyright (C) 2008 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 Mono.Unix;

using Mistelix.Transitions;
using Mistelix.Core;
using Mistelix.DataModel;
using Mistelix.Backends.GStreamer;

namespace Mistelix.Core
{
	//
	// Container for a slideshow and all its images
	//
	public class SlideShow : SlideShowProjectElement
	{
		public SlideShow ()
		{	

		}

		public string Generate (Project project, ProgressEventHandler progress)
		{
			int total_frames = 0;
			int frames_sec = project.Details.FramesPerSecond;
			ProgressEventArgs args = new ProgressEventArgs ();
	
			for (int i = 0; i < images.Count - 1; i++) 
			{
				total_frames += (frames_sec * images[i].ShowTime) + (images[i].TransitionTime * frames_sec);
				((SlideImage) images[i]).Project = project;
			}

			((SlideImage) images[images.Count - 1]).Project = project;
			total_frames += frames_sec * images[images.Count - 1].ShowTime;
			args.Total = images.Count;

			Logger.Debug ("SlideShow.Generate. Generating MPEG for " + images.Count + " images " + "total frames " + total_frames + " at " + filename);
			
			string outfile;
			
			if (filename == null)
				outfile = GetOutputFile (project.Details.Type);
			else
				outfile = filename;
			
			Backends.GStreamer.SlideShow.CreateStream (project.FileToFullPath (outfile), project.Details.Type,
				(uint) project.Details.Width, (uint) project.Details.Height, (uint) frames_sec, (uint) total_frames);

			if (AudioFile != null) {
				Logger.Debug ("SlideShow.Generate. Audiofile {0}", AudioFile);
				Backends.GStreamer.SlideShow.AddAudio (AudioFile);
			}

			Transition transition;
			Logger.Debug ("SlideShow.Generate. Images.Count {0}", images.Count);

			// We need to make sure that source and target slides are loaded. Here we make sure that source is loaded
			((SlideImage) images[0]).LoadSlide ();

			for (int i = 0;  i < images.Count - 1; i++) {

				if (progress != null) {
					args.Progress = args.Progress + 1;
					progress (this, args);
				}

				Logger.Debug ("SlideShow.Generate. Send Fixed image {0}, time {1} (frames)", i, (uint) (frames_sec * images[i].ShowTime));
				transition = TransitionManager.CreateFromName (images[i].Transition);
				Backends.GStreamer.SlideShow.AddImageFixed (((SlideImage)images[i]), (uint) (frames_sec * images[i].ShowTime));
		
				// Transition between two images
				Logger.Debug ("SlideShow.Generate. Generate transition for frames_sec {0} and time {1}", frames_sec, images[i].TransitionTime);

				// We need to make sure that source and target slides are loaded. Here we make sure that target is loaded
				((SlideImage) images[i + 1]).LoadSlide (); // Here we do target

				transition.Source = (SlideImage) images[i];
				transition.Target = (SlideImage) images[i + 1];
				transition.Frames = frames_sec * images[i].TransitionTime;
				foreach (SlideImage img in transition)
					Backends.GStreamer.SlideShow.AddImage (img);

				Logger.Debug ("Sending subimage completed");
				((SlideImage) images[i]).ReleasePixels ();
			}

			Logger.Debug ("SlideShow.Generate. Send fixed image time {0} (frames)", (uint) (frames_sec * images[images.Count -1].ShowTime));
			Backends.GStreamer.SlideShow.AddImageFixed (((SlideImage)images[images.Count - 1]), (uint) (frames_sec * images[images.Count -1].ShowTime));
			((SlideImage) images[images.Count - 1]).ReleasePixels ();
	
			if (progress != null) {
				args.Progress = args.Progress + 1;
				progress (this, args);
			}

			// This a blocking call. It does not return until the pipeline sends an EOS
			Backends.GStreamer.SlideShow.Close ();
			Logger.Debug ("SlideShow.Generate. Finished generation");
			return project.FileToFullPath (outfile);
		}

		public override ThumbnailCollection GetThumbnailRepresentations (int width, int height)
		{
			ThumbnailCollection collection = new ThumbnailCollection ();
			int idx = 0;

			foreach (SlideImage image in images)
			{
				ThumbnailCollection.ItemTask task = new ThumbnailCollection.ItemTask (image);
				task.ThumbnailIndex = idx++;
				task.DoEventHandler += delegate (object obj, EventArgs args)
				{
					ThumbnailCollection.ItemTask item = (ThumbnailCollection.ItemTask) obj;
					SlideImage img = (SlideImage) item.Data;
					Gdk.Pixbuf im = Backends.ThumbnailCache.Factory.Provider.GetThumbnail (img.image, width, height);

					if (im == null)
						im = new Gdk.Pixbuf (img.image);

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

					item.Pixbuf = scaled;
					im.Dispose ();
				};
				collection.AddItem (task);
			}
			return collection;
		}

		// Check if the audio uses a supported format
		public bool AudioSupportedFormat (out string msg)
		{
			Dependencies dependencies;
			string format;

			format = Backends.GStreamer.DetectMedia.GetType (AudioFile);
			Logger.Debug ("SlideShow.SupportedFormat. Filename {0} is {1}", AudioFile, format);

			dependencies = new Dependencies ();
			
			if (String.Compare (format, "application/x-id3", StringComparison.OrdinalIgnoreCase) == 0)
			{				
				if (dependencies.MP3Support == false)
				{
					msg = String.Format (Catalog.GetString ("The file '{0}' is encoded in MP3 but you do not have the right codec installed."), AudioFile);
					return false;
				}
			}

			msg = string.Empty;
			return true;
		}
	}
}