using System;
using System.Collections;
using System.IO;
using System.Xml;
using Server.Commands;
using Server.Network;

namespace Server.Gumps
{
	public abstract class CAGNode
	{
		public abstract string Caption{ get; }
		public abstract void OnClick( Mobile from, int page );
	}

	public class CAGObject : CAGNode
	{
		private readonly Type m_Type;
		private readonly int m_ItemID;
		private readonly int m_Hue;
		private readonly CAGCategory m_Parent;

		public Type Type{ get{ return m_Type; } }
		public int ItemID{ get{ return m_ItemID; } }
		public int Hue{ get{ return m_Hue; } }
		public CAGCategory Parent{ get{ return m_Parent; } }

		public override string Caption{ get{ return ( m_Type == null ? "bad type" : m_Type.Name ); } }

		public override void OnClick( Mobile from, int page )
		{
			if ( m_Type == null )
			{
				from.SendMessage( "That is an invalid type name." );
			}
			else
			{
				CommandSystem.Handle( from, String.Format( "{0}Add {1}", CommandSystem.Prefix, m_Type.Name ) );

				from.SendGump( new CategorizedAddGump( from, m_Parent, page ) );
			}
		}

		public CAGObject( CAGCategory parent, XmlTextReader xml )
		{
			m_Parent = parent;

			if ( xml.MoveToAttribute( "type" ) )
				m_Type = ScriptCompiler.FindTypeByFullName( xml.Value, false );

			if ( xml.MoveToAttribute( "gfx" ) )
				m_ItemID = XmlConvert.ToInt32( xml.Value );

			if ( xml.MoveToAttribute( "hue" ) )
				m_Hue = XmlConvert.ToInt32( xml.Value );
		}
	}

	public class CAGCategory : CAGNode
	{
		private readonly string m_Title;
		private readonly CAGNode[] m_Nodes;
		private readonly CAGCategory m_Parent;

		public string Title{ get{ return m_Title; } }
		public CAGNode[] Nodes{ get{ return m_Nodes; } }
		public CAGCategory Parent{ get{ return m_Parent; } }

		public override string Caption{ get{ return m_Title; } }

		public override void OnClick( Mobile from, int page )
		{
			from.SendGump( new CategorizedAddGump( from, this, 0 ) );
		}

		private CAGCategory()
		{
			m_Title = "no data";
			m_Nodes = new CAGNode[0];
		}

		public CAGCategory( CAGCategory parent, XmlTextReader xml )
		{
			m_Parent = parent;

			if ( xml.MoveToAttribute( "title" ) )
				m_Title = xml.Value;
			else
				m_Title = "empty";

			if ( m_Title == "Docked" )
				m_Title = "Docked 2";

			if ( xml.IsEmptyElement )
			{
				m_Nodes = new CAGNode[0];
			}
			else
			{
				ArrayList nodes = new ArrayList();

				while ( xml.Read() && xml.NodeType != XmlNodeType.EndElement )
				{
					if ( xml.NodeType == XmlNodeType.Element && xml.Name == "object" )
						nodes.Add( new CAGObject( this, xml ) );
					else if ( xml.NodeType == XmlNodeType.Element && xml.Name == "category" )
					{
						if( !xml.IsEmptyElement )
							nodes.Add( new CAGCategory( this, xml ) );
					}
					else
						xml.Skip();
				}

				m_Nodes = (CAGNode[])nodes.ToArray( typeof( CAGNode ) );
			}
		}

		private static CAGCategory m_Root;

		public static CAGCategory Root
		{
			get
			{
				if ( m_Root == null )
					m_Root = Load( "Data/objects.xml" );

				return m_Root;
			}
		}

		public static CAGCategory Load( string path )
		{
			if ( File.Exists( path ) )
			{
				XmlTextReader xml = new XmlTextReader( path );

				xml.WhitespaceHandling = WhitespaceHandling.None;

				while ( xml.Read() )
				{
					if ( xml.Name == "category" && xml.NodeType == XmlNodeType.Element )
					{
						CAGCategory cat = new CAGCategory( null, xml );

						xml.Close();

						return cat;
					}
				}
			}

			return new CAGCategory();
		}
	}

	public class CategorizedAddGump : Gump
	{
		public static bool OldStyle = PropsConfig.OldStyle;

		public static readonly int EntryHeight = 24;//PropsConfig.EntryHeight;

		public static readonly int OffsetSize = PropsConfig.OffsetSize;
		public static readonly int BorderSize = PropsConfig.BorderSize;

		public static readonly int GumpOffsetX = PropsConfig.GumpOffsetX;
		public static readonly int GumpOffsetY = PropsConfig.GumpOffsetY;

		public static readonly int TextHue = PropsConfig.TextHue;
		public static readonly int TextOffsetX = PropsConfig.TextOffsetX;

		public static readonly int OffsetGumpID = PropsConfig.OffsetGumpID;
		public static readonly int HeaderGumpID = PropsConfig.HeaderGumpID;
		public static readonly int  EntryGumpID = PropsConfig.EntryGumpID;
		public static readonly int   BackGumpID = PropsConfig.BackGumpID;
		public static readonly int    SetGumpID = PropsConfig.SetGumpID;

		public static readonly int SetWidth = PropsConfig.SetWidth;
		public static readonly int SetOffsetX = PropsConfig.SetOffsetX, SetOffsetY = PropsConfig.SetOffsetY + (((EntryHeight - 20) / 2) / 2);
		public static readonly int SetButtonID1 = PropsConfig.SetButtonID1;
		public static readonly int SetButtonID2 = PropsConfig.SetButtonID2;

		public static readonly int PrevWidth = PropsConfig.PrevWidth;
		public static readonly int PrevOffsetX = PropsConfig.PrevOffsetX, PrevOffsetY = PropsConfig.PrevOffsetY + (((EntryHeight - 20) / 2) / 2);
		public static readonly int PrevButtonID1 = PropsConfig.PrevButtonID1;
		public static readonly int PrevButtonID2 = PropsConfig.PrevButtonID2;

		public static readonly int NextWidth = PropsConfig.NextWidth;
		public static readonly int NextOffsetX = PropsConfig.NextOffsetX, NextOffsetY = PropsConfig.NextOffsetY + (((EntryHeight - 20) / 2) / 2);
		public static readonly int NextButtonID1 = PropsConfig.NextButtonID1;
		public static readonly int NextButtonID2 = PropsConfig.NextButtonID2;

		private static bool PrevLabel = false, NextLabel = false;

		private static readonly int PrevLabelOffsetX = PrevWidth + 1;
		private static readonly int PrevLabelOffsetY = 0;

		private static readonly int NextLabelOffsetX = -29;
		private static readonly int NextLabelOffsetY = 0;

		private static readonly int EntryWidth = 180;
		private static readonly int EntryCount = 15;

		private static readonly int TotalWidth = OffsetSize + EntryWidth + OffsetSize + SetWidth + OffsetSize;
		private static readonly int TotalHeight = OffsetSize + ((EntryHeight + OffsetSize) * (EntryCount + 1));

		private static readonly int BackWidth = BorderSize + TotalWidth + BorderSize;
		private static readonly int BackHeight = BorderSize + TotalHeight + BorderSize;

		private readonly Mobile m_Owner;
		private readonly CAGCategory m_Category;
		private int m_Page;

		public CategorizedAddGump( Mobile owner ) : this( owner, CAGCategory.Root, 0 )
		{
		}

		public CategorizedAddGump( Mobile owner, CAGCategory category, int page ) : base( GumpOffsetX, GumpOffsetY )
		{
			owner.CloseGump( typeof( WhoGump ) );

			m_Owner = owner;
			m_Category = category;

			Initialize( page );
		}

		public void Initialize( int page )
		{
			m_Page = page;

			CAGNode[] nodes = m_Category.Nodes;

			int count = nodes.Length - (page * EntryCount);

			if ( count < 0 )
				count = 0;
			else if ( count > EntryCount )
				count = EntryCount;

			int totalHeight = OffsetSize + ((EntryHeight + OffsetSize) * (count + 1));

			AddPage( 0 );

			AddBackground( 0, 0, BackWidth, BorderSize + totalHeight + BorderSize, BackGumpID );
			AddImageTiled( BorderSize, BorderSize, TotalWidth - (OldStyle ? SetWidth + OffsetSize : 0), totalHeight, OffsetGumpID );

			int x = BorderSize + OffsetSize;
			int y = BorderSize + OffsetSize;

			if ( OldStyle )
				AddImageTiled( x, y, TotalWidth - (OffsetSize * 3) - SetWidth, EntryHeight, HeaderGumpID );
			else
				AddImageTiled( x, y, PrevWidth, EntryHeight, HeaderGumpID );

			if ( m_Category.Parent != null )
			{
				AddButton( x + PrevOffsetX, y + PrevOffsetY, PrevButtonID1, PrevButtonID2, 1, GumpButtonType.Reply, 0 );

				if ( PrevLabel )
					AddLabel( x + PrevLabelOffsetX, y + PrevLabelOffsetY, TextHue, "Previous" );
			}

			x += PrevWidth + OffsetSize;

			int emptyWidth = TotalWidth - (PrevWidth * 2) - NextWidth - (OffsetSize * 5) - (OldStyle ? SetWidth + OffsetSize : 0);

			if ( !OldStyle )
				AddImageTiled( x - (OldStyle ? OffsetSize : 0), y, emptyWidth + (OldStyle ? OffsetSize * 2 : 0), EntryHeight, EntryGumpID );

			AddHtml( x + TextOffsetX, y + ((EntryHeight - 20) / 2), emptyWidth - TextOffsetX, EntryHeight, String.Format( "<center>{0}</center>", m_Category.Caption ), false, false );

			x += emptyWidth + OffsetSize;

			if ( OldStyle )
				AddImageTiled( x, y, TotalWidth - (OffsetSize * 3) - SetWidth, EntryHeight, HeaderGumpID );
			else
				AddImageTiled( x, y, PrevWidth, EntryHeight, HeaderGumpID );

			if ( page > 0 )
			{
				AddButton( x + PrevOffsetX, y + PrevOffsetY, PrevButtonID1, PrevButtonID2, 2, GumpButtonType.Reply, 0 );

				if ( PrevLabel )
					AddLabel( x + PrevLabelOffsetX, y + PrevLabelOffsetY, TextHue, "Previous" );
			}

			x += PrevWidth + OffsetSize;

			if ( !OldStyle )
				AddImageTiled( x, y, NextWidth, EntryHeight, HeaderGumpID );

			if ( (page + 1) * EntryCount < nodes.Length )
			{
				AddButton( x + NextOffsetX, y + NextOffsetY, NextButtonID1, NextButtonID2, 3, GumpButtonType.Reply, 1 );

				if ( NextLabel )
					AddLabel( x + NextLabelOffsetX, y + NextLabelOffsetY, TextHue, "Next" );
			}

			for ( int i = 0, index = page * EntryCount; i < EntryCount && index < nodes.Length; ++i, ++index )
			{
				x = BorderSize + OffsetSize;
				y += EntryHeight + OffsetSize;

				CAGNode node = nodes[index];

				AddImageTiled( x, y, EntryWidth, EntryHeight, EntryGumpID );
				AddLabelCropped( x + TextOffsetX, y + ((EntryHeight - 20) / 2), EntryWidth - TextOffsetX, EntryHeight, TextHue, node.Caption );

				x += EntryWidth + OffsetSize;

				if ( SetGumpID != 0 )
					AddImageTiled( x, y, SetWidth, EntryHeight, SetGumpID );

				AddButton( x + SetOffsetX, y + SetOffsetY, SetButtonID1, SetButtonID2, i + 4, GumpButtonType.Reply, 0 );

				if ( node is CAGObject )
				{
					CAGObject obj = (CAGObject)node;
					int itemID = obj.ItemID;

					Rectangle2D bounds = ItemBounds.Table[itemID];

					if ( itemID != 1 && bounds.Height < (EntryHeight * 2) )
					{
						if ( bounds.Height < EntryHeight )
							AddItem( x - OffsetSize - 22 - ((i % 2) * 44) - (bounds.Width / 2) - bounds.X, y + (EntryHeight / 2) - (bounds.Height / 2) - bounds.Y, itemID );
						else
							AddItem( x - OffsetSize - 22 - ((i % 2) * 44) - (bounds.Width / 2) - bounds.X, y + EntryHeight - 1 - bounds.Height - bounds.Y, itemID );
					}
				}
			}
		}

		public override void OnResponse( NetState state, RelayInfo info )
		{
			Mobile from = m_Owner;

			switch ( info.ButtonID )
			{
				case 0: // Closed
				{
					return;
				}
				case 1: // Up
				{
					if ( m_Category.Parent != null )
					{
						int index = Array.IndexOf( m_Category.Parent.Nodes, m_Category ) / EntryCount;

						if ( index < 0 )
							index = 0;

						from.SendGump( new CategorizedAddGump( from, m_Category.Parent, index ) );
					}

					break;
				}
				case 2: // Previous
				{
					if ( m_Page > 0 )
						from.SendGump( new CategorizedAddGump( from, m_Category, m_Page - 1 ) );

					break;
				}
				case 3: // Next
				{
					if ( (m_Page + 1) * EntryCount < m_Category.Nodes.Length )
						from.SendGump( new CategorizedAddGump( from, m_Category, m_Page + 1 ) );

					break;
				}
				default:
				{
					int index = (m_Page * EntryCount) + (info.ButtonID - 4);

					if ( index >= 0 && index < m_Category.Nodes.Length )
						m_Category.Nodes[index].OnClick( from, m_Page );

					break;
				}
			}
		}
	}
}
