using System.Linq;
using OpenRA.FileFormats;
using System.Drawing;
using OpenRA.Support;
#region Copyright & License Information
/*
 * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made 
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation. For more information,
 * see LICENSE.
 */
#endregion

namespace OpenRA.Widgets.Delegates
{
	public class MusicPlayerDelegate : IWidgetDelegate
	{
		string CurrentSong = null;
		public MusicPlayerDelegate()
		{
			var bg = Widget.RootWidget.GetWidget("MUSIC_MENU");
			CurrentSong = GetNextSong();

			bg.GetWidget("BUTTON_CLOSE").OnMouseUp = mi => {
				Game.Settings.Save();
				Widget.RootWidget.CloseWindow();
				return true;
			};
			
			Widget.RootWidget.GetWidget("MAINMENU_BUTTON_MUSIC").OnMouseUp = mi => {
				Widget.RootWidget.OpenWindow("MUSIC_MENU");
				return true;
			};
			
			bg.GetWidget("BUTTON_PLAY").OnMouseUp = mi =>
			{
				if (CurrentSong == null)
					return true;
				
				Sound.PlayMusicThen(Rules.Music[CurrentSong].Filename,
				      () => bg.GetWidget(Game.Settings.Sound.Repeat ? "BUTTON_PLAY" : "BUTTON_NEXT").OnMouseUp(new MouseInput()));
				bg.GetWidget("BUTTON_PLAY").Visible = false;
				bg.GetWidget("BUTTON_PAUSE").Visible = true;

				return true;
			};
			
			bg.GetWidget("BUTTON_PAUSE").OnMouseUp = mi =>
			{				
				Sound.PauseMusic();
				bg.GetWidget("BUTTON_PAUSE").Visible = false;
				bg.GetWidget("BUTTON_PLAY").Visible = true;
				return true;
			};
			
			bg.GetWidget("BUTTON_STOP").OnMouseUp = mi =>
			{
				Sound.StopMusic();
				bg.GetWidget("BUTTON_PAUSE").Visible = false;
				bg.GetWidget("BUTTON_PLAY").Visible = true;
				
				return true;
			};
			
			bg.GetWidget("BUTTON_NEXT").OnMouseUp = mi =>
			{
				CurrentSong = GetNextSong();
				return bg.GetWidget("BUTTON_PLAY").OnMouseUp(mi);
			};

			bg.GetWidget("BUTTON_PREV").OnMouseUp = mi =>
			{
				CurrentSong = GetPrevSong();
				return bg.GetWidget("BUTTON_PLAY").OnMouseUp(mi);
			};
			
			var shuffle = bg.GetWidget<CheckboxWidget>("SHUFFLE");
			shuffle.OnMouseDown = mi =>
			{
				Game.Settings.Sound.Shuffle ^= true;
				return true;
			};
			shuffle.Checked = () => Game.Settings.Sound.Shuffle;
			
			var repeat = bg.GetWidget<CheckboxWidget>("REPEAT");
			repeat.OnMouseDown = mi => 
			{
				Game.Settings.Sound.Repeat ^= true;
				return true;
			};
			repeat.Checked = () => Game.Settings.Sound.Repeat;
			
			bg.GetWidget<LabelWidget>("TIME").GetText = () =>
			{
				if (CurrentSong == null)
					return "";
				return "{0:D2}:{1:D2} / {2:D2}:{3:D2}".F((int)Sound.MusicSeekPosition / 60, (int)Sound.MusicSeekPosition % 60,
			                                                                                    Rules.Music[CurrentSong].Length / 60, Rules.Music[CurrentSong].Length % 60);
			};
			
			var ml = bg.GetWidget<ListBoxWidget>("MUSIC_LIST");
			var itemTemplate = ml.GetWidget<LabelWidget>("MUSIC_TEMPLATE");
			int offset = itemTemplate.Bounds.Y;
			
			foreach (var kv in Rules.Music.Where(m => m.Value.Exists))
			{
				var song = kv.Key;
				if (CurrentSong == null)
					CurrentSong = song;

				var template = itemTemplate.Clone() as LabelWidget;
				template.Id = "SONG_{0}".F(song);
				template.GetBackground = () => ((song == CurrentSong) ? "dialog2" : null);
				template.OnMouseDown = mi =>
				{
					CurrentSong = song;
					bg.GetWidget("BUTTON_PLAY").OnMouseUp(mi);
					return true;
				};
				template.Parent = ml;

				template.Bounds = new Rectangle(template.Bounds.X, offset, template.Bounds.Width, template.Bounds.Height);
				template.IsVisible = () => true;
				
				template.GetWidget<LabelWidget>("TITLE").GetText = () => "   " + Rules.Music[song].Title;
				template.GetWidget<LabelWidget>("LENGTH").GetText = () => "{0:D2}:{1:D2}".F(Rules.Music[song].Length / 60, Rules.Music[song].Length % 60);

				ml.AddChild(template);

				offset += template.Bounds.Height;
				ml.ContentHeight += template.Bounds.Height;
			}
		}
		
		string GetNextSong()
		{
			var songs = Rules.Music.Where(a => a.Value.Exists)
				.Select(a => a.Key);
			
			if (Game.Settings.Sound.Shuffle)
				return songs.Random(Game.CosmeticRandom);
			
			return songs.SkipWhile(m => m != CurrentSong)
				.Skip(1).FirstOrDefault() ?? songs.FirstOrDefault();

		}

		string GetPrevSong()
		{
			var songs = Rules.Music.Where(a => a.Value.Exists)
				.Select(a => a.Key).Reverse();
			
			if (Game.Settings.Sound.Shuffle)
				return songs.Random(Game.CosmeticRandom);
			
			return songs.SkipWhile(m => m != CurrentSong)
				.Skip(1).FirstOrDefault() ?? songs.FirstOrDefault();
		}
	}
}