using System;
using System.IO;
using System.Xml;
using System.Collections;
using System.Reflection;
using Server;
using Server.Items;
using Server.Commands;

namespace Server.Commands
{
	public class Categorization
	{
		private static CategoryEntry m_RootItems, m_RootMobiles;

		public static CategoryEntry Items
		{
			get
			{
				if ( m_RootItems == null )
					Load();

				return m_RootItems;
			}
		}

		public static CategoryEntry Mobiles
		{
			get
			{
				if ( m_RootMobiles == null )
					Load();

				return m_RootMobiles;
			}
		}

		public static void Initialize()
		{
			CommandSystem.Register( "RebuildCategorization", AccessLevel.Administrator, new CommandEventHandler( RebuildCategorization_OnCommand ) );
		}

		[Usage( "RebuildCategorization" )]
		[Description( "Rebuilds the categorization data file used by the Add command." )]
		public static void RebuildCategorization_OnCommand( CommandEventArgs e )
		{
			CategoryEntry root = new CategoryEntry( null, "Add Menu", new CategoryEntry[]{ Items, Mobiles } );

			Export( root, "Data/objects.xml", "Objects" );

			e.Mobile.SendMessage( "Categorization menu rebuilt." );
		}

		public static void RecurseFindCategories( CategoryEntry ce, ArrayList list )
		{
			list.Add( ce );

			for ( int i = 0; i < ce.SubCategories.Length; ++i )
				RecurseFindCategories( ce.SubCategories[i], list );
		}

		public static void Export( CategoryEntry ce, string fileName, string title )
		{
			XmlTextWriter xml = new XmlTextWriter( fileName, System.Text.Encoding.UTF8 );

			xml.Indentation = 1;
			xml.IndentChar = '\t';
			xml.Formatting = Formatting.Indented;

			xml.WriteStartDocument( true );

			RecurseExport( xml, ce );

			xml.Flush();
			xml.Close();
		}

		public static void RecurseExport( XmlTextWriter xml, CategoryEntry ce )
		{
			xml.WriteStartElement( "category" );

			xml.WriteAttributeString( "title", ce.Title );

			ArrayList subCats = new ArrayList( ce.SubCategories );

			subCats.Sort( new CategorySorter() );

			for ( int i = 0; i < subCats.Count; ++i )
				RecurseExport( xml, (CategoryEntry)subCats[i] );

			ce.Matched.Sort( new CategorySorter() );

			for ( int i = 0; i < ce.Matched.Count; ++i )
			{
				CategoryTypeEntry cte = (CategoryTypeEntry)ce.Matched[i];

				xml.WriteStartElement( "object" );

				xml.WriteAttributeString( "type", cte.Type.ToString() );

				object obj = cte.Object;

				if ( obj is Item )
				{
					Item item = (Item)obj;

					int itemID = item.ItemID;

					if ( item is BaseAddon && ((BaseAddon)item).Components.Count == 1 )
						itemID = ((AddonComponent)(((BaseAddon)item).Components[0])).ItemID;

					if ( itemID >= 0x4000 )
						itemID = 1;

					xml.WriteAttributeString( "gfx", XmlConvert.ToString( itemID ) );

					int hue = item.Hue & 0x7FFF;

					if ( (hue & 0x4000) != 0 )
						hue = 0;

					if ( hue != 0 )
						xml.WriteAttributeString( "hue", XmlConvert.ToString( hue ) );

					item.Delete();
				}
				else if ( obj is Mobile )
				{
					Mobile mob = (Mobile)obj;

					int itemID = ShrinkTable.Lookup( mob, 1 );

					xml.WriteAttributeString( "gfx", XmlConvert.ToString( itemID ) );

					int hue = mob.Hue & 0x7FFF;

					if ( (hue & 0x4000) != 0 )
						hue = 0;

					if ( hue != 0 )
						xml.WriteAttributeString( "hue", XmlConvert.ToString( hue ) );

					mob.Delete();
				}

				xml.WriteEndElement();
			}

			xml.WriteEndElement();
		}

		public static void Load()
		{
			ArrayList types = new ArrayList();

			AddTypes( Core.Assembly, types );

			for ( int i = 0; i < ScriptCompiler.Assemblies.Length; ++i )
				AddTypes( ScriptCompiler.Assemblies[i], types );

			m_RootItems = Load( types, "Data/items.cfg" );
			m_RootMobiles = Load( types, "Data/mobiles.cfg" );
		}

		private static CategoryEntry Load( ArrayList types, string config )
		{
			CategoryLine[] lines = CategoryLine.Load( config );

			if ( lines.Length > 0 )
			{
				int index = 0;
				CategoryEntry root = new CategoryEntry( null, lines, ref index );

				Fill( root, types );

				return root;
			}

			return new CategoryEntry();
		}

		private static Type typeofItem = typeof( Item );
		private static Type typeofMobile = typeof( Mobile );
		private static Type typeofConstructable = typeof( ConstructableAttribute );

		private static bool IsConstructable( Type type )
		{
			if ( !type.IsSubclassOf( typeofItem ) && !type.IsSubclassOf( typeofMobile ) )
				return false;

			ConstructorInfo ctor = type.GetConstructor( Type.EmptyTypes );

			return ( ctor != null && ctor.IsDefined( typeofConstructable, false ) );
		}

		private static void AddTypes( Assembly asm, ArrayList types )
		{
			Type[] allTypes = asm.GetTypes();

			for ( int i = 0; i < allTypes.Length; ++i )
			{
				Type type = allTypes[i];

				if ( type.IsAbstract )
					continue;

				if ( IsConstructable( type ) )
					types.Add( type );
			}
		}

		private static void Fill( CategoryEntry root, ArrayList list )
		{
			for ( int i = 0; i < list.Count; ++i )
			{
				Type type = (Type)list[i];
				CategoryEntry match = GetDeepestMatch( root, type );

				if ( match == null )
					continue;

				try
				{
					match.Matched.Add( new CategoryTypeEntry( type ) );
				}
				catch
				{
				}
			}
		}

		private static CategoryEntry GetDeepestMatch( CategoryEntry root, Type type )
		{
			if ( !root.IsMatch( type ) )
				return null;

			for ( int i = 0; i < root.SubCategories.Length; ++i )
			{
				CategoryEntry check = GetDeepestMatch( root.SubCategories[i], type );

				if ( check != null )
					return check;
			}

			return root;
		}
	}

	public class CategorySorter : IComparer
	{
		public int Compare( object x, object y )
		{
			string a = null, b = null;

			if ( x is CategoryEntry )
				a = ((CategoryEntry)x).Title;
			else if ( x is CategoryTypeEntry )
				a = ((CategoryTypeEntry)x).Type.Name;

			if ( y is CategoryEntry )
				b = ((CategoryEntry)y).Title;
			else if ( y is CategoryTypeEntry )
				b = ((CategoryTypeEntry)y).Type.Name;

			if ( a == null && b == null )
				return 0;

			if ( a == null )
				return 1;

			if ( b == null )
				return -1;

			return a.CompareTo( b );
		}
	}

	public class CategoryTypeEntry
	{
		private Type m_Type;
		private object m_Object;

		public Type Type{ get{ return m_Type; } }
		public object Object{ get{ return m_Object; } }

		public CategoryTypeEntry( Type type )
		{
			m_Type = type;
			m_Object = Activator.CreateInstance( type );
		}
	}

	public class CategoryEntry
	{
		private string m_Title;
		private Type[] m_Matches;
		private CategoryEntry[] m_SubCategories;
		private CategoryEntry m_Parent;
		private ArrayList m_Matched;

		public string Title{ get{ return m_Title; } }
		public Type[] Matches{ get{ return m_Matches; } }
		public CategoryEntry Parent{ get{ return m_Parent; } }
		public CategoryEntry[] SubCategories{ get{ return m_SubCategories; } }
		public ArrayList Matched{ get{ return m_Matched; } }

		public CategoryEntry()
		{
			m_Title = "(empty)";
			m_Matches = new Type[0];
			m_SubCategories = new CategoryEntry[0];
			m_Matched = new ArrayList();
		}

		public CategoryEntry( CategoryEntry parent, string title, CategoryEntry[] subCats )
		{
			m_Parent = parent;
			m_Title = title;
			m_SubCategories = subCats;
			m_Matches = new Type[0];
			m_Matched = new ArrayList();
		}

		public bool IsMatch( Type type )
		{
			bool isMatch = false;

			for ( int i = 0; !isMatch && i < m_Matches.Length; ++i )
				isMatch = ( type == m_Matches[i] || type.IsSubclassOf( m_Matches[i] ) );

			return isMatch;
		}

		public CategoryEntry( CategoryEntry parent, CategoryLine[] lines, ref int index )
		{
			m_Parent = parent;

			string text = lines[index].Text;

			int start = text.IndexOf( '(' );

			if ( start < 0 )
				throw new FormatException( String.Format( "Input string not correctly formatted ('{0}')", text ) );

			m_Title = text.Substring( 0, start ).Trim();

			int end = text.IndexOf( ')', ++start );

			if ( end < start )
				throw new FormatException( String.Format( "Input string not correctly formatted ('{0}')", text ) );

			text = text.Substring( start, end-start );
			string[] split = text.Split( ';' );

			ArrayList list = new ArrayList();

			for ( int i = 0; i < split.Length; ++i )
			{
				Type type = ScriptCompiler.FindTypeByName( split[i].Trim() );

				if ( type == null )
					Console.WriteLine( "Match type not found ('{0}')", split[i].Trim() );
				else
					list.Add( type );
			}

			m_Matches = (Type[])list.ToArray( typeof( Type ) );
			list.Clear();

			int ourIndentation = lines[index].Indentation;

			++index;

			while ( index < lines.Length && lines[index].Indentation > ourIndentation )
				list.Add( new CategoryEntry( this, lines, ref index ) );

			m_SubCategories = (CategoryEntry[])list.ToArray( typeof( CategoryEntry ) );
			list.Clear();

			m_Matched = list;
		}
	}

	public class CategoryLine
	{
		private int m_Indentation;
		private string m_Text;

		public int Indentation{ get{ return m_Indentation; } }
		public string Text{ get{ return m_Text; } }

		public CategoryLine( string input )
		{
			int index;

			for ( index = 0; index < input.Length; ++index )
			{
				if ( Char.IsLetter( input, index ) )
					break;
			}

			if ( index >= input.Length )
				throw new FormatException( String.Format( "Input string not correctly formatted ('{0}')", input ) );

			m_Indentation = index;
			m_Text = input.Substring( index );
		}

		public static CategoryLine[] Load( string path )
		{
			ArrayList list = new ArrayList();

			if ( File.Exists( path ) )
			{
				using ( StreamReader ip = new StreamReader( path ) )
				{
					string line;

					while ( (line = ip.ReadLine()) != null )
						list.Add( new CategoryLine( line ) );
				}
			}

			return (CategoryLine[])list.ToArray( typeof( CategoryLine ) );
		}
	}
}