using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using Server.Commands.Generic;
using Server.Gumps;
using Server.Network;
using CommandInfo=Server.Commands.Docs.DocCommandEntry;
using CommandInfoSorter=Server.Commands.Docs.CommandEntrySorter;

namespace Server.Commands
{
	public class HelpInfo
	{

		private static readonly Dictionary<string, CommandInfo> m_HelpInfos = new Dictionary<string, CommandInfo>();
		private static List<CommandInfo> m_SortedHelpInfo = new List<CommandInfo>();	//No need for SortedList cause it's only sorted once at creation...

		public static Dictionary<string, CommandInfo> HelpInfos{ get { return m_HelpInfos; } }
		public static List<CommandInfo> SortedHelpInfo { get { return m_SortedHelpInfo; } }

		[CallPriority( 100 )]
		public static void Initialize()
		{
			CommandSystem.Register( "HelpInfo", AccessLevel.Player, HelpInfo_OnCommand );

			FillTable();
		}

		[Usage( "HelpInfo [<command>]" )]
		[Description( "Gives information on a specified command, or when no argument specified, displays a gump containing all commands" )]
		private static void HelpInfo_OnCommand( CommandEventArgs e )
		{
			if( e.Length > 0 )
			{
				string arg = e.GetString( 0 ).ToLower();
				CommandInfo c;

				if( m_HelpInfos.TryGetValue( arg, out c ) )
				{
					Mobile m = e.Mobile;

					if( m.AccessLevel >= c.AccessLevel )
						m.SendGump( new CommandInfoGump( c ) );
					else
						m.SendMessage( "You don't have access to that command." );

					return;
				}
				else
					e.Mobile.SendMessage( String.Format( "Command '{0}' not found!", arg ) );
			}

			e.Mobile.SendGump( new CommandListGump( 0, e.Mobile, null ) );

		}

		public static void FillTable()
		{
			List<CommandEntry> commands = new List<CommandEntry>( CommandSystem.Entries.Values );
			List<CommandInfo> list = new List<CommandInfo>();

			commands.Sort();
			commands.Reverse();
			Docs.Clean( commands );

			for( int i = 0; i < commands.Count; ++i )
			{
				CommandEntry e =commands[i];

				MethodInfo mi = e.Handler.Method;

				object[] attrs = mi.GetCustomAttributes( typeof( UsageAttribute ), false );

				if( attrs.Length == 0 )
					continue;

				UsageAttribute usage = attrs[0] as UsageAttribute;

				attrs = mi.GetCustomAttributes( typeof( DescriptionAttribute ), false );

				if( attrs.Length == 0 )
					continue;

				DescriptionAttribute desc = attrs[0] as DescriptionAttribute;

				if( usage == null || desc == null )
					continue;

				attrs = mi.GetCustomAttributes( typeof( AliasesAttribute ), false );

				AliasesAttribute aliases = (attrs.Length == 0 ? null : attrs[0] as AliasesAttribute);

				string descString = desc.Description.Replace( "<", "(" ).Replace( ">", ")" );

				if( aliases == null )
					list.Add( new CommandInfo( e.AccessLevel, e.Command, null, usage.Usage, descString ) );
				else
				{
					list.Add( new CommandInfo( e.AccessLevel, e.Command, aliases.Aliases, usage.Usage, descString ) );

					for( int j = 0; j < aliases.Aliases.Length; j++ )
					{
						string[] newAliases = new string[aliases.Aliases.Length];

						aliases.Aliases.CopyTo( newAliases, 0 );

						newAliases[j] = e.Command;

						list.Add( new CommandInfo( e.AccessLevel, aliases.Aliases[j], newAliases, usage.Usage, descString ) );
					}
				}
			}


			for( int i = 0; i < TargetCommands.AllCommands.Count; ++i )
			{
				BaseCommand command = TargetCommands.AllCommands[i];

				string usage = command.Usage;
				string desc = command.Description;

				if( usage == null || desc == null )
					continue;

				string[] cmds = command.Commands;
				string cmd = cmds[0];
				string[] aliases = new string[cmds.Length - 1];

				for( int j = 0; j < aliases.Length; ++j )
					aliases[j] = cmds[j + 1];

				desc = desc.Replace( "<", "(" ).Replace( ">", ")" );

				if( command.Supports != CommandSupport.Single )
				{
					StringBuilder sb = new StringBuilder( 50 + desc.Length );

					sb.Append( "Modifiers: " );

					if( (command.Supports & CommandSupport.Global) != 0 )
						sb.Append( "<i><Global</i>, " );

					if( (command.Supports & CommandSupport.Online) != 0 )
						sb.Append( "<i>Online</i>, " );

					if( (command.Supports & CommandSupport.Region) != 0 )
						sb.Append( "<i>Region</i>, " );

					if( (command.Supports & CommandSupport.Contained) != 0 )
						sb.Append( "<i>Contained</i>, " );

					if( (command.Supports & CommandSupport.Multi) != 0 )
						sb.Append( "<i>Multi</i>, " );

					if( (command.Supports & CommandSupport.Area) != 0 )
						sb.Append( "<i>Area</i>, " );

					if( (command.Supports & CommandSupport.Self) != 0 )
						sb.Append( "<i>Self</i>, " );

					sb.Remove( sb.Length - 2, 2 );
					sb.Append( "<br>" );
					sb.Append( desc );

					desc = sb.ToString();
				}

				list.Add( new CommandInfo( command.AccessLevel, cmd, aliases, usage, desc ) );

				for( int j = 0; j < aliases.Length; j++ )
				{
					string[] newAliases = new string[aliases.Length];

					aliases.CopyTo( newAliases, 0 );

					newAliases[j] = cmd;

					list.Add( new CommandInfo( command.AccessLevel, aliases[j], newAliases, usage, desc ) );
				}
			}

			List<BaseCommandImplementor> commandImpls = BaseCommandImplementor.Implementors;

			for( int i = 0; i < commandImpls.Count; ++i )
			{
				BaseCommandImplementor command = commandImpls[i];

				string usage = command.Usage;
				string desc = command.Description;

				if( usage == null || desc == null )
					continue;

				string[] cmds = command.Accessors;
				string cmd = cmds[0];
				string[] aliases = new string[cmds.Length - 1];

				for( int j = 0; j < aliases.Length; ++j )
					aliases[j] = cmds[j + 1];

				desc = desc.Replace( "<", ")" ).Replace( ">", ")" );

				list.Add( new CommandInfo( command.AccessLevel, cmd, aliases, usage, desc ) );

				for( int j = 0; j < aliases.Length; j++ )
				{
					string[] newAliases = new string[aliases.Length];

					aliases.CopyTo( newAliases, 0 );

					newAliases[j] = cmd;

					list.Add( new CommandInfo( command.AccessLevel, aliases[j], newAliases, usage, desc ) );
				}
			}

			list.Sort( new CommandInfoSorter() );

			m_SortedHelpInfo = list;

			foreach( CommandInfo c in m_SortedHelpInfo )
			{
				if( !m_HelpInfos.ContainsKey( c.Name.ToLower() ) )
					m_HelpInfos.Add( c.Name.ToLower(), c );
			}
		}

		public class CommandListGump : BaseGridGump
		{
			private const int EntriesPerPage = 15;

		    readonly int m_Page;
		    readonly List<CommandInfo> m_List;

			public CommandListGump( int page, Mobile from, List<CommandInfo> list )
				: base( 30, 30 )
			{
				m_Page = page;

				if( list == null )
				{
					m_List = new List<CommandInfo>();

					foreach( CommandInfo c in m_SortedHelpInfo )
					{
						if( from.AccessLevel >= c.AccessLevel )
							m_List.Add( c );
					}
				}
				else
					m_List = list;


				AddNewPage();

				if( m_Page > 0 )
					AddEntryButton( 20, ArrowLeftID1, ArrowLeftID2, 1, ArrowLeftWidth, ArrowLeftHeight );
				else
					AddEntryHeader( 20 );

				AddEntryHtml( 160, Center( String.Format( "Page {0} of {1}", m_Page+1, (m_List.Count + EntriesPerPage - 1) / EntriesPerPage ) ) );

				if( (m_Page + 1) * EntriesPerPage < m_List.Count )
					AddEntryButton( 20, ArrowRightID1, ArrowRightID2, 2, ArrowRightWidth, ArrowRightHeight );
				else
					AddEntryHeader( 20 );

				int last = (int)AccessLevel.Player - 1;

				for( int i = m_Page * EntriesPerPage, line = 0; line < EntriesPerPage && i < m_List.Count; ++i, ++line )
				{
					CommandInfo c = m_List[i];
					if( from.AccessLevel >= c.AccessLevel )
					{
						if( (int)c.AccessLevel != last )
						{
							AddNewLine();

							AddEntryHtml( 20 + OffsetSize + 160, Color( c.AccessLevel.ToString(), 0xFF0000 ) );
							AddEntryHeader( 20 );
							line++;
						}

						last = (int)c.AccessLevel;

						AddNewLine();

						AddEntryHtml( 20 + OffsetSize + 160, c.Name );

						AddEntryButton( 20, ArrowRightID1, ArrowRightID2, 3 + i, ArrowRightWidth, ArrowRightHeight );
					}
				}

				FinishPage();
			}

			public override void OnResponse( NetState sender, RelayInfo info )
			{
				Mobile m = sender.Mobile;
				switch( info.ButtonID )
				{
					case 0:
						{
							m.CloseGump( typeof( CommandInfoGump ) );
							break;
						}
					case 1:
						{
							if( m_Page > 0 )
								m.SendGump( new CommandListGump( m_Page - 1, m, m_List ) );

							break;
						}
					case 2:
						{
							if( (m_Page + 1) * EntriesPerPage < m_SortedHelpInfo.Count )
								m.SendGump( new CommandListGump( m_Page + 1, m, m_List ) );

							break;
						}
					default:
						{

							int v = info.ButtonID - 3;

							if( v >= 0 && v < m_List.Count )
							{
								CommandInfo c = m_List[v];

								if( m.AccessLevel >= c.AccessLevel )
								{
									m.SendGump( new CommandInfoGump( c ) );
									m.SendGump( new CommandListGump( m_Page, m, m_List ) );
								}
								else
								{
									m.SendMessage( "You no longer have access to that command." );
									m.SendGump( new CommandListGump( m_Page, m, null ) );
								}
							}
							break;
						}
				}
			}
		}


		public class CommandInfoGump : Gump
		{
			public string Color( string text, int color )
			{
				return String.Format( "<BASEFONT COLOR=#{0:X6}>{1}</BASEFONT>", color, text );
			}

			public string Center( string text )
			{
				return String.Format( "<CENTER>{0}</CENTER>", text );
			}

			public CommandInfoGump( CommandInfo info )
				: this( info, 320, 200 )
			{
			}

			public CommandInfoGump( CommandInfo info, int width, int height )
				: base( 300, 50 )
			{
				AddPage( 0 );

				AddBackground( 0, 0, width, height, 5054 );

				//AddImageTiled( 10, 10, width - 20, 20, 2624 );
				//AddAlphaRegion( 10, 10, width - 20, 20 );
				//AddHtmlLocalized( 10, 10, width - 20, 20, header, headerColor, false, false );
				AddHtml( 10, 10, width - 20, 20, Color( Center( info.Name ), 0xFF0000 ), false, false );

				//AddImageTiled( 10, 40, width - 20, height - 80, 2624 );
				//AddAlphaRegion( 10, 40, width - 20, height - 80 );

				StringBuilder sb = new StringBuilder();

				sb.Append( "Usage: " );
				sb.Append( info.Usage.Replace( "<", "(" ).Replace( ">", ")" ) );
				sb.Append( "<BR>" );

				string[] aliases = info.Aliases;

				if( aliases != null && aliases.Length != 0 )
				{
					sb.Append( String.Format( "Alias{0}: ", aliases.Length == 1 ? "" : "es" ) );

					for( int i = 0; i < aliases.Length; ++i )
					{
						if( i != 0 )
							sb.Append( ", " );

						sb.Append( aliases[i] );
					}

					sb.Append( "<BR>" );
				}

				sb.Append( "AccessLevel: " );
				sb.Append( info.AccessLevel.ToString() );
				sb.Append( "<BR>" );
				sb.Append( "<BR>" );

				sb.Append( info.Description );

				AddHtml( 10, 40, width - 20, height - 80, sb.ToString(), false, true );

				//AddImageTiled( 10, height - 30, width - 20, 20, 2624 );
				//AddAlphaRegion( 10, height - 30, width - 20, 20 );

			}
		}
	}
}