#region Copyright & License Information
/*
 * Copyright (c) The OpenRA Developers and Contributors
 * 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.Linq;
using OpenRA.Traits;

namespace OpenRA.Mods.Common.Traits
{
	[TraitLocation(SystemActors.World)]
	public class TerrainTunnelInfo : TraitInfo<TerrainTunnel>, Requires<TerrainTunnelLayerInfo>, ILobbyCustomRulesIgnore
	{
		[FieldLoader.Require]
		[Desc("Location of the tunnel")]
		public readonly CPos Location = CPos.Zero;

		[FieldLoader.Require]
		[Desc("Height of the tunnel floor in map height steps.")]
		public readonly byte Height = 0;

		[FieldLoader.Require]
		[Desc("Size of the tunnel footprint")]
		public readonly CVec Dimensions = CVec.Zero;

		[FieldLoader.Require]
		[Desc("Tunnel footprint.", "_ is passable, x is blocked, and o are tunnel portals.")]
		public readonly string Footprint = string.Empty;

		[FieldLoader.Require]
		[Desc("Terrain type of the tunnel floor.")]
		public readonly string TerrainType = null;

		public IEnumerable<CPos> TunnelCells()
		{
			return CellsMatching('_').Concat(CellsMatching('o'));
		}

		public IEnumerable<CPos> PortalCells()
		{
			return CellsMatching('o');
		}

		IEnumerable<CPos> CellsMatching(char c)
		{
			var index = 0;
			var footprint = Footprint.Where(x => !char.IsWhiteSpace(x)).ToArray();
			for (var y = 0; y < Dimensions.Y; y++)
				for (var x = 0; x < Dimensions.X; x++)
					if (footprint[index++] == c)
						yield return Location + new CVec(x, y);
		}
	}

	public class TerrainTunnel { }
}