#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program 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.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Globalization;
using CodeImp.DoomBuilder.Data;
using System.IO;
using CodeImp.DoomBuilder.Rendering;

#endregion

namespace CodeImp.DoomBuilder.ZDoom
{
	public sealed class PatchStructure
	{
		#region ================== Constants

		// Some odd things in ZDoom
		private const string IGNORE_SPRITE = "TNT1A0";

		#endregion

		#region ================== Variables

		// Declaration
		private readonly string name;
		private readonly int offsetx;
		private readonly int offsety;
		private readonly bool flipx;
		private readonly bool flipy;
		private readonly float alpha;
		private readonly int rotation; //mxd
		private readonly TexturePathRenderStyle renderStyle; //mxd
		private readonly PixelColor blendColor; //mxd
		private readonly TexturePathBlendStyle blendStyle; //mxd
		private readonly float tintAmmount; //mxd
		private static readonly string[] renderStyles = { "copy", "translucent", "add", "subtract", "reversesubtract", "modulate", "copyalpha", "copynewalpha", "overlay" }; //mxd
		private readonly bool skip; //mxd

		#endregion

		#region ================== Properties

		public string Name { get { return name; } }
		public int OffsetX { get { return offsetx; } }
		public int OffsetY { get { return offsety; } }
		public bool FlipX { get { return flipx; } }
		public bool FlipY { get { return flipy; } }
		public float Alpha { get { return alpha; } }
		public int Rotation { get { return rotation; } } //mxd
		public TexturePathRenderStyle RenderStyle { get { return renderStyle; } } //mxd
		public TexturePathBlendStyle BlendStyle { get { return blendStyle; } }
		public float TintAmmount { get { return tintAmmount; } }
		public PixelColor BlendColor { get { return blendColor; } }//mxd
		public bool Skip { get { return skip; } } //mxd

		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		internal PatchStructure(TexturesParser parser)
		{
			// Initialize
			alpha = 1.0f;
			renderStyle = TexturePathRenderStyle.Copy;//mxd
			blendStyle = TexturePathBlendStyle.None; //mxd
			
			// There should be 3 tokens separated by 2 commas now:
			// Name, Width, Height

			// First token is the class name
			parser.SkipWhitespace(true);
			name = parser.StripTokenQuotes(parser.ReadToken(false)); //mxd. Don't skip newline
			if(string.IsNullOrEmpty(name))
			{
				parser.ReportError("Expected patch name");
				return;
			}

			//mxd. Skip what must be skipped
			skip = (name.ToUpperInvariant() == IGNORE_SPRITE);

			//mxd
			name = name.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);

			// Now we should find a comma
			if(!parser.NextTokenIs(",")) return; //mxd

			// Next is the patch width
			parser.SkipWhitespace(true);
			string tokenstr = parser.ReadToken();
			if(string.IsNullOrEmpty(tokenstr) || !int.TryParse(tokenstr, NumberStyles.Integer, CultureInfo.InvariantCulture, out offsetx))
			{
				parser.ReportError("Expected offset in pixels");
				return;
			}

			// Now we should find a comma again
			if(!parser.NextTokenIs(",")) return; //mxd

			// Next is the patch height
			parser.SkipWhitespace(true);
			tokenstr = parser.ReadToken();
			if(string.IsNullOrEmpty(tokenstr) || !int.TryParse(tokenstr, NumberStyles.Integer, CultureInfo.InvariantCulture, out offsety))
			{
				parser.ReportError("Expected offset in pixels");
				return;
			}

			// Next token is the beginning of the texture scope. If not, then the patch info ends here.
			if(!parser.NextTokenIs("{", false)) return; //mxd

			// Now parse the contents of texture structure
			bool done = false; //mxd
			while(!done && parser.SkipWhitespace(true))
			{
				string token = parser.ReadToken();
				token = token.ToLowerInvariant();

				switch(token) 
				{
					case "flipx":
						flipx = true;
						break;

					case "flipy":
						flipy = true;
						break;

					case "alpha":
						if(!ReadTokenFloat(parser, token, out alpha)) return;
						alpha = General.Clamp(alpha, 0.0f, 1.0f);
						break;

					case "rotate":
						if(!ReadTokenInt(parser, token, out rotation)) return;
						rotation = rotation % 360; //Coalesce multiples
						if(rotation < 0) rotation += 360; //Force positive

						if(rotation != 0 && rotation != 90 && rotation != 180 && rotation != 270) 
						{
							parser.LogWarning("Unsupported rotation (" + rotation + ") in patch \"" + name + "\"");
							rotation = 0;
						}
						break;

					case "style": //mxd
						string s;
						if(!ReadTokenString(parser, token, out s)) return;
						int index = Array.IndexOf(renderStyles, s.ToLowerInvariant());
						renderStyle = index == -1 ? TexturePathRenderStyle.Copy : (TexturePathRenderStyle) index;
						break;

					case "blend": //mxd
						int val;
						if(!ReadTokenColor(parser, token, out val)) return;
						blendColor = PixelColor.FromInt(val);

						parser.SkipWhitespace(false);
						token = parser.ReadToken();

						if(token == ",") //read tint ammount
						{ 
							parser.SkipWhitespace(false);
							if(!ReadTokenFloat(parser, token, out tintAmmount)) return;
							tintAmmount = General.Clamp(tintAmmount, 0.0f, 1.0f);
							blendStyle = TexturePathBlendStyle.Tint;
						} 
						else 
						{
							blendStyle = TexturePathBlendStyle.Blend;
							// Rewind so this structure can be read again
							parser.DataStream.Seek(-token.Length, SeekOrigin.Current);
						}
						break;

					case "}":
						// Patch scope ends here,
						// break out of this parse loop
						done = true;
						break;
				}
			}
		}

		#endregion

		#region ================== Methods

		// This reads the next token and sets a floating point value, returns false when failed
		private static bool ReadTokenFloat(TexturesParser parser, string propertyname, out float value)
		{
			// Next token is the property value to set
			parser.SkipWhitespace(true);
			string strvalue = parser.ReadToken();
			if(!string.IsNullOrEmpty(strvalue))
			{
				// Try parsing as value
				if(!float.TryParse(strvalue, NumberStyles.Float, CultureInfo.InvariantCulture, out value))
				{
					parser.ReportError("Expected numeric value for property \"" + propertyname + "\"");
					return false;
				}
				// Success
				return true;
			}

			// Can't find the property value!
			parser.ReportError("Expected a value for property \"" + propertyname + "\"");
			value = 0.0f;
			return false;
		}

		// This reads the next token and sets an integral value, returns false when failed
		private static bool ReadTokenInt(TexturesParser parser, string propertyname, out int value)
		{
			// Next token is the property value to set
			parser.SkipWhitespace(true);
			string strvalue = parser.ReadToken();
			if(!string.IsNullOrEmpty(strvalue))
			{
				// Try parsing as value
				if(!int.TryParse(strvalue, NumberStyles.Integer, CultureInfo.InvariantCulture, out value))
				{
					parser.ReportError("Expected integral value for property \"" + propertyname + "\"");
					return false;
				}

				// Success
				return true;
			}

			// Can't find the property value!
			parser.ReportError("Expected a value for property \"" + propertyname + "\"");
			value = 0;
			return false;
		}

		//mxd. This reads the next token and sets a string value, returns false when failed
		private static bool ReadTokenString(TexturesParser parser, string propertyname, out string value) 
		{
			parser.SkipWhitespace(true);
			value = parser.StripTokenQuotes(parser.ReadToken());
			
			if(string.IsNullOrEmpty(value)) 
			{
				// Can't find the property value!
				parser.ReportError("Expected a value for property \"" + propertyname + "\"");
				return false;
			}

			return true;
		}

		//mxd. This reads the next token and sets a PixelColor value, returns false when failed
		private static bool ReadTokenColor(TexturesParser parser, string propertyname, out int value) 
		{
			parser.SkipWhitespace(true);
			string strvalue = parser.StripTokenQuotes(parser.ReadToken());
			value = 0;

			if(string.IsNullOrEmpty(strvalue)) 
			{
				// Can't find the property value!
				parser.ReportError("Expected a value for property \"" + propertyname + "\"");
				return false;
			}

			if(strvalue[0] != '#') 
			{
				parser.ReportError("Expected color value for property \"" + propertyname + "\"");
				return false;
			}

			// Try parsing as value
			if(!int.TryParse(strvalue.Remove(0, 1), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out value)) 
			{
				parser.ReportError("Expected color value for property \"" + propertyname + "\"");
				return false;
			}

			return true;
		}

		#endregion
	}
}