#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.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;

namespace OpenRA.FileFormats
{
	public class TerrainTypeInfo
	{
		public string Type;
		public bool Buildable = true;
		public bool AcceptSmudge = true;
		public bool IsWater = false;
		public Color Color;

		public TerrainTypeInfo() {}
		public TerrainTypeInfo(MiniYaml my) { FieldLoader.Load(this, my); }
		public MiniYaml Save() { return FieldSaver.Save(this); }
	}
	
	public class TileTemplate
	{
		public ushort Id;
		public string Image;
		public int2 Size;
		public bool PickAny;
		public Dictionary<byte, string> Tiles = new Dictionary<byte, string>();
		
		static List<string> fields = new List<string>() {"Id", "Image", "Size", "PickAny"};

		public TileTemplate() {}
		public TileTemplate(MiniYaml my)
		{
			FieldLoader.LoadFields(this, my.Nodes, fields);

			Tiles = my.Nodes["Tiles"].Nodes.ToDictionary(
				t => byte.Parse(t.Key),
				t => t.Value.Value);
		}
		
		public MiniYaml Save()
		{
			var root = new Dictionary<string, MiniYaml>();
			foreach (var field in fields)
			{
				FieldInfo f = this.GetType().GetField(field);
				if (f.GetValue(this) == null) continue;
				root.Add(field, new MiniYaml(FieldSaver.FormatValue(this, f), null));
			}

			root.Add("Tiles",
				new MiniYaml(null, Tiles.ToDictionary(
					p => p.Key.ToString(),
					p => new MiniYaml(p.Value))));
			
			return new MiniYaml(null, root);
		}
	}
	
	public class TileSet
	{
		public string Name;
		public string Id;
		public string Palette;
		public string[] Extensions;
		public Dictionary<string, TerrainTypeInfo> Terrain = new Dictionary<string, TerrainTypeInfo>();
		public Dictionary<ushort, Terrain> Tiles = new Dictionary<ushort, Terrain>();
		public Dictionary<ushort, TileTemplate> Templates = new Dictionary<ushort, TileTemplate>();
		static List<string> fields = new List<string>() {"Name", "Id", "Palette", "Extensions"};

		public TileSet() {}
		public TileSet( string filepath )
		{
			var yaml = MiniYaml.FromFile(filepath);
			
			// General info
			FieldLoader.Load(this, yaml["General"]);

			// TerrainTypes
			Terrain = yaml["Terrain"].Nodes.Values
				.Select(y => new TerrainTypeInfo(y)).ToDictionary(t => t.Type);

			// Templates
			Templates = yaml["Templates"].Nodes.Values
				.Select(y => new TileTemplate(y)).ToDictionary(t => t.Id);
		}
		
		public void LoadTiles()
		{
			foreach (var t in Templates)
				using( Stream s = FileSystem.OpenWithExts(t.Value.Image, Extensions) )
				{
					if( !Tiles.ContainsKey( t.Key ) )
						Tiles.Add( t.Key, new Terrain( s ) );
				}
		}
		
		public void Save(string filepath)
		{			
			var root = new Dictionary<string, MiniYaml>();
			foreach (var field in fields)
			{
				FieldInfo f = this.GetType().GetField(field);
				if (f.GetValue(this) == null) continue;
				root.Add(field, new MiniYaml(FieldSaver.FormatValue(this, f), null));
			}
			
			var gen = new Dictionary<string, MiniYaml>();
			foreach (var field in fields)
			{
				FieldInfo f = this.GetType().GetField(field);
				if (f.GetValue(this) == null) continue;
				gen.Add(field, new MiniYaml(FieldSaver.FormatValue(this, f), null));
			}
			root.Add("General", new MiniYaml(null, gen)); 
			
			root.Add("Terrain",
				new MiniYaml(null, Terrain.ToDictionary(
					t => "TerrainType@{0}".F(t.Value.Type),
					t => t.Value.Save())));
			
			root.Add("Templates",
				new MiniYaml(null, Templates.ToDictionary(
					t => "Template@{0}".F(t.Value.Id),
					t => t.Value.Save())));
			root.WriteToFile(filepath);
		} 
				
		public byte[] GetBytes(TileReference<ushort,byte> r)
		{
			Terrain tile;
			if( Tiles.TryGetValue( r.type, out tile ) )
				return tile.TileBitmapBytes[ r.image ];
			
			byte[] missingTile = new byte[ 24 * 24 ];
			for( int i = 0 ; i < missingTile.Length ; i++ )
				missingTile[ i ] = 0x36;

			return missingTile;
		}

		public string GetTerrainType(TileReference<ushort, byte> r)
		{
			var tt = Templates[r.type].Tiles;
			string ret;
			if (!tt.TryGetValue(r.image, out ret))
				return "Clear"; // Default walkable
			return ret;
		}
	}
}