// Simple Lyric plugin
// (C) 2005 Fernando Herrera <fherrera@onirica.com>
// This file is Under GPL 2.0
// Compile with "mcs -target:library -out:Lyrics.dll Lyrics.cs -pkg:muine-plugin"

using Muine.PluginLib;
using System;
using System.IO;
using System.Net;
using System.Xml;
using Gtk;

public class Lyrics : Plugin
{
	private IPlayer player;
	private Window lyrics;
	TextView view;
	private class AsyncUpdate {

		public void UpdateLyrics (string[] artists, string title, TextView view)
		{
			bool found = false;
			TextBuffer buffer = view.Buffer;
			buffer.Clear();

			if (artists.Length > 0 && artists[0] != null && title != null) {
				buffer.InsertAtCursor ("\nSearching for lyrics...\n");
				buffer.ApplyTag ("title", buffer.StartIter, buffer.EndIter);

				WebClient client = new WebClient();
				Stream data = client.OpenRead  ("http://lyrc.com.ar/xsearch.php?songname="+title+"&artist="+artists[0]+"&act=1");
				StreamReader reader = new StreamReader (data);
				string s = reader.ReadToEnd ();
				XmlTextReader xmlreader = new XmlTextReader (s, XmlNodeType.Element, null);
				while (xmlreader.Read ()) {
					if (xmlreader.LocalName=="lyric") {
						xmlreader.Read ();
						buffer.Clear();
						buffer.InsertAtCursor (artists[0] + ": " + title + "\n\n");
						buffer.ApplyTag ("title", buffer.StartIter, buffer.EndIter);
						buffer.InsertAtCursor (xmlreader.Value);
						buffer.InsertAtCursor ("\n\nLyrics provided by lyrc.com.ar");
						buffer.ApplyTag ("copy", buffer.GetIterAtLine (buffer.LineCount - 1), buffer.EndIter);
						found = true;
						break;
					}
				}
				xmlreader.Close();
			}

			if (found == false) {
				buffer.Clear();
				buffer.InsertAtCursor ("\nLyrics not found!\n");
				buffer.ApplyTag ("title", buffer.StartIter, buffer.EndIter);
			}
		}
	}

	private delegate void AsyncDelegate(string[] artists, string title, TextView view);

	public override void Initialize(IPlayer player)
	{
		this.player = player;

		ActionEntry [] action_entries = new Gtk.ActionEntry [] {
			new ActionEntry ("ShowLyrics", Gtk.Stock.Italic, "Show _Lyrics ",
			"<control><shift>L", null, new EventHandler (OnShowLyrics))
		};
		ActionGroup action_group = new ActionGroup ("LyricsPluginActions");
		action_group.Add (action_entries);

		player.UIManager.InsertActionGroup (action_group, -1);
		player.UIManager.AddUi (this.player.UIManager.NewMergeId (),
		"/MenuBar/FileMenu/ExtraFileActions", "ShowLyricsMenuItem", "ShowLyrics",
		UIManagerItemType.Menuitem, false);
		player.SongChangedEvent += new SongChangedEventHandler (OnSongChangedEvent);

		view = new TextView ();
		TextBuffer buffer = view.Buffer;
		TextTag titleTag = new TextTag ("title");
		titleTag.Weight = Pango.Weight.Bold;
		buffer.TagTable.Add (titleTag);
		TextTag copyTag = new TextTag ("copy");
		copyTag.Weight = Pango.Weight.Light;
		copyTag.Style = Pango.Style.Italic;
		buffer.TagTable.Add (copyTag);

		lyrics = null;
	}
	
	private void OnHideLyrics (object sender, Gtk.DeleteEventArgs args)
	{
		lyrics.Hide ();
		args.RetVal = true;
	}
	private void OnShowLyrics (object sender, EventArgs e)
	{
		AsyncUpdate au = new AsyncUpdate ();
		AsyncDelegate dlgt = new AsyncDelegate(au.UpdateLyrics);
		if (lyrics != null) {
			lyrics.ShowAll ();
			lyrics.Present ();
			return;
		}

		lyrics = new Window ("Lyrics");
		lyrics.SetDefaultSize (600,400);

		ScrolledWindow scroll = new ScrolledWindow ();
		scroll.VscrollbarPolicy = PolicyType.Automatic;
		scroll.HscrollbarPolicy = PolicyType.Automatic;
		scroll.Add (view);
		lyrics.Add (scroll);
		lyrics.DeleteEvent += OnHideLyrics; 

		dlgt.BeginInvoke(player.PlayingSong.Artists, player.PlayingSong.Title, view, null, null);

		lyrics.ShowAll ();
	}

	private void OnSongChangedEvent (ISong song)
	{
		if (song == null)
			return;
		if (lyrics != null) {
			AsyncUpdate au = new AsyncUpdate ();
			AsyncDelegate dlgt = new AsyncDelegate(au.UpdateLyrics);
			dlgt.BeginInvoke(song.Artists, song.Title, view, null, null);
		}
	}
}