#region Copyright & License Information
/*
 * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
 * This file is part of OpenRA.
 * 
 *  OpenRA is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  OpenRA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using OpenRA.Graphics;

namespace OpenRA.Traits
{
	public abstract class RenderSimpleInfo : ITraitInfo
	{
		public readonly string Image = null;
		public readonly string Palette = null;
		public abstract object Create(ActorInitializer init);
	}

	public abstract class RenderSimple : IRender, ITick
	{
		public Dictionary<string, AnimationWithOffset> anims = new Dictionary<string, AnimationWithOffset>();
		public Animation anim { get { return anims[""].Animation; } protected set { anims[""].Animation = value; } }

		public string GetImage(Actor self)
		{
			return self.Info.Traits.Get<RenderSimpleInfo>().Image ?? self.Info.Name;
		}

		public RenderSimple(Actor self, Func<int> baseFacing)
		{
			anims.Add( "", new Animation( GetImage(self), baseFacing ) );
		}

		public virtual IEnumerable<Renderable> Render( Actor self )
		{
			var palette = self.Info.Traits.Get<RenderSimpleInfo>().Palette;
			foreach( var a in anims.Values )
				if( a.DisableFunc == null || !a.DisableFunc() )
					yield return ( palette == null ) ? a.Image( self ) : a.Image( self ).WithPalette(palette);
		}

		public virtual void Tick(Actor self)
		{
			foreach( var a in anims.Values )
				a.Animation.Tick();
		}

		public class AnimationWithOffset
		{
			public Animation Animation;
			public Func<float2> OffsetFunc;
			public Func<bool> DisableFunc;
			public int ZOffset;

			public AnimationWithOffset( Animation a )
				: this( a, null, null )
			{
			}

			public AnimationWithOffset( Animation a, Func<float2> o, Func<bool> d )
			{
				this.Animation = a;
				this.OffsetFunc = o;
				this.DisableFunc = d;
			}

			public Renderable Image( Actor self )
			{
				var r = Util.Centered( self, Animation.Image, self.CenterLocation 
					+ (OffsetFunc != null ? OffsetFunc() : float2.Zero) );
				return ZOffset != 0 ? r.WithZOffset(ZOffset) : r;
			}

			public static implicit operator AnimationWithOffset( Animation a )
			{
				return new AnimationWithOffset( a );
			}
		}
	}
}