#region Copyright & License Information
/*
 * Copyright 2007-2017 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, either version 3 of
 * the License, or (at your option) any later version. For more
 * information, see COPYING.
 */
#endregion

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

namespace OpenRA.Traits
{
	[Desc("This actor is selectable. Defines bounds of selectable area, selection class and selection priority.")]
	public class SelectableInfo : ITraitInfo, IDecorationBoundsInfo
	{
		public readonly int Priority = 10;

		[Desc("Bounds for the selectable area.")]
		public readonly int[] Bounds = null;

		[Desc("Area outside the visible selection box that is enabled for selection")]
		public readonly int Margin = 0;

		[Desc("All units having the same selection class specified will be selected with select-by-type commands (e.g. double-click). "
		+ "Defaults to the actor name when not defined or inherited.")]
		public readonly string Class = null;

		[VoiceReference] public readonly string Voice = "Select";

		public object Create(ActorInitializer init) { return new Selectable(init.Self, this); }
	}

	public class Selectable : IMouseBounds, IDecorationBounds
	{
		public readonly string Class = null;

		public SelectableInfo Info;

		public Selectable(Actor self, SelectableInfo info)
		{
			Class = string.IsNullOrEmpty(info.Class) ? self.Info.Name : info.Class;
			Info = info;
		}

		Rectangle IMouseBounds.MouseoverBounds(Actor self, WorldRenderer wr)
		{
			if (Info.Bounds == null)
				return Rectangle.Empty;

			var size = new int2(Info.Bounds[0], Info.Bounds[1]);

			var offset = -size / 2 - new int2(Info.Margin, Info.Margin);
			if (Info.Bounds.Length > 2)
				offset += new int2(Info.Bounds[2], Info.Bounds[3]);

			var xy = wr.ScreenPxPosition(self.CenterPosition) + offset;
			return new Rectangle(xy.X, xy.Y, size.X + 2 * Info.Margin, size.Y + 2 * Info.Margin);
		}

		Rectangle IDecorationBounds.DecorationBounds(Actor self, WorldRenderer wr)
		{
			if (Info.Bounds == null)
				return Rectangle.Empty;

			var size = new int2(Info.Bounds[0], Info.Bounds[1]);

			var offset = -size / 2;
			if (Info.Bounds.Length > 2)
				offset += new int2(Info.Bounds[2], Info.Bounds[3]);

			var xy = wr.ScreenPxPosition(self.CenterPosition) + offset;
			return new Rectangle(xy.X, xy.Y, size.X, size.Y);
		}
	}
}