context: using System;
  using System.Collections;
  using Server.Targeting;
  using Server.Network;
  using Server.Misc;
  using Server.Items;
  using Server.Mobiles;
  
  namespace Server.Spells.Fourth
  {
  	public class FireFieldSpell : MagerySpell
  	{
  		private static SpellInfo m_Info = new SpellInfo(
  				"Fire Field", "In Flam Grav",
  				215,
  				9041,
  				false,
  				Reagent.BlackPearl,
  				Reagent.SpidersSilk,
  				Reagent.SulfurousAsh
  			);
  
  		public override SpellCircle Circle { get { return SpellCircle.Fourth; } }
  
  		public FireFieldSpell( Mobile caster, Item scroll ) : base( caster, scroll, m_Info )
  		{
  		}
  
  		public override void OnCast()
  		{
  			Caster.Target = new InternalTarget( this );
  		}
  
  		public void Target( IPoint3D p )
  		{
  			if ( !Caster.CanSee( p ) )
  			{
  				Caster.SendLocalizedMessage( 500237 ); // Target can not be seen.
  			}
  			else if ( SpellHelper.CheckTown( p, Caster ) && CheckSequence() )
  			{
  				SpellHelper.Turn( Caster, p );
  
  				SpellHelper.GetSurfaceTop( ref p );
  
  				int dx = Caster.Location.X - p.X;
  				int dy = Caster.Location.Y - p.Y;
  				int rx = (dx - dy) * 44;
  				int ry = (dx + dy) * 44;
  
  				bool eastToWest;
  
  				if ( rx >= 0 && ry >= 0 )
  				{
  					eastToWest = false;
  				}
  				else if ( rx >= 0 )
  				{
  					eastToWest = true;
  				}
  				else if ( ry >= 0 )
  				{
  					eastToWest = true;
  				}
  				else
  				{
  					eastToWest = false;
  				}
  
  				Effects.PlaySound( p, Caster.Map, 0x20C );
  
  				int itemID = eastToWest ? 0x398C : 0x3996;
  
  				TimeSpan duration;
  
  				if ( Core.AOS )
  					duration = TimeSpan.FromSeconds( (15 + (Caster.Skills.Magery.Fixed / 5)) / 4 );
  				else
  					duration = TimeSpan.FromSeconds( 4.0 + (Caster.Skills[SkillName.Magery].Value * 0.5) );
  
  				for ( int i = -2; i <= 2; ++i )
  				{
  					Point3D loc = new Point3D( eastToWest ? p.X + i : p.X, eastToWest ? p.Y : p.Y + i, p.Z );
  
  					new FireFieldItem( itemID, loc, Caster, Caster.Map, duration, i );
  				}
  			}
  
  			FinishSequence();
  		}
  
  		[DispellableField]
  		public class FireFieldItem : Item
  		{
  			private Timer m_Timer;
  			private DateTime m_End;
  			private Mobile m_Caster;
  			private int m_Damage;
  
  			public override bool BlocksFit{ get{ return true; } }
  
  			public FireFieldItem( int itemID, Point3D loc, Mobile caster, Map map, TimeSpan duration, int val )
  				: this( itemID, loc, caster, map, duration, val, 2 )
  			{
  			}
  
  			public FireFieldItem( int itemID, Point3D loc, Mobile caster, Map map, TimeSpan duration, int val, int damage ) : base( itemID )
  			{
  				bool canFit = SpellHelper.AdjustField( ref loc, map, 12, false );
  
  				Visible = false;
  				Movable = false;
  				Light = LightType.Circle300;
  
  				MoveToWorld( loc, map );
  
  				m_Caster = caster;
  
  				m_Damage = damage;
  
  				m_End = DateTime.UtcNow + duration;
  
  				m_Timer = new InternalTimer( this, TimeSpan.FromSeconds( Math.Abs( val ) * 0.2 ), caster.InLOS( this ), canFit );
  				m_Timer.Start();
  			}
  
  			public override void OnAfterDelete()
  			{
  				base.OnAfterDelete();
  
  				if ( m_Timer != null )
  					m_Timer.Stop();
  			}
  
  			public FireFieldItem( Serial serial ) : base( serial )
  			{
  			}
  
  			public override void Serialize( GenericWriter writer )
  			{
  				base.Serialize( writer );
  
  				writer.Write( (int) 2 ); // version
  
  				writer.Write( m_Damage );
  				writer.Write( m_Caster );
  				writer.WriteDeltaTime( m_End );
  			}
  
  			public override void Deserialize( GenericReader reader )
  			{
  				base.Deserialize( reader );
  
  				int version = reader.ReadInt();
  
  				switch ( version )
  				{
  					case 2:
  					{
  						m_Damage = reader.ReadInt();
  						goto case 1;
  					}
  					case 1:
  					{
  						m_Caster = reader.ReadMobile();
  
  						goto case 0;
  					}
  					case 0:
  					{
  						m_End = reader.ReadDeltaTime();
  
  						m_Timer = new InternalTimer( this, TimeSpan.Zero, true, true );
  						m_Timer.Start();
  
  						break;
  					}
  				}
  
  				if( version < 2 )
  					m_Damage = 2;
  			}
  
  			public override bool OnMoveOver( Mobile m )
  			{
  				if ( Visible && m_Caster != null && (!Core.AOS || m != m_Caster) && SpellHelper.ValidIndirectTarget( m_Caster, m ) && m_Caster.CanBeHarmful( m, false ) )
  				{
  					if ( SpellHelper.CanRevealCaster( m ) )
  						m_Caster.RevealingAction();
  					
  					m_Caster.DoHarmful( m );
  
  					int damage = m_Damage;
  
  					if ( !Core.AOS && m.CheckSkill( SkillName.MagicResist, 0.0, 30.0 ) )
  					{
  						damage = 1;
  
  						m.SendLocalizedMessage( 501783 ); // You feel yourself resisting magical energy.
  					}
  
  					AOS.Damage( m, m_Caster, damage, 0, 100, 0, 0, 0 );
  					m.PlaySound( 0x208 );
  
  					if ( m is BaseCreature )
  						((BaseCreature) m).OnHarmfulSpell( m_Caster );
  				}
  
  				return true;
  			}
  
  			private class InternalTimer : Timer
  			{
  				private FireFieldItem m_Item;
  				private bool m_InLOS, m_CanFit;
  
  				private static Queue m_Queue = new Queue();
  
  				public InternalTimer( FireFieldItem item, TimeSpan delay, bool inLOS, bool canFit ) : base( delay, TimeSpan.FromSeconds( 1.0 ) )
  				{
  					m_Item = item;
  					m_InLOS = inLOS;
  					m_CanFit = canFit;
  
  					Priority = TimerPriority.FiftyMS;
  				}
  
  				protected override void OnTick()
  				{
  					if ( m_Item.Deleted )
  						return;
  
  					if ( !m_Item.Visible )
  					{
  						if ( m_InLOS && m_CanFit )
  							m_Item.Visible = true;
  						else
  							m_Item.Delete();
  
  						if ( !m_Item.Deleted )
  						{
  							m_Item.ProcessDelta();
  							Effects.SendLocationParticles( EffectItem.Create( m_Item.Location, m_Item.Map, EffectItem.DefaultDuration ), 0x376A, 9, 10, 5029 );
  						}
  					}
  					else if ( DateTime.UtcNow > m_Item.m_End )
  					{
  						m_Item.Delete();
  						Stop();
  					}
  					else
  					{
  						Map map = m_Item.Map;
  						Mobile caster = m_Item.m_Caster;
  
  						if ( map != null && caster != null )
  						{
  							foreach ( Mobile m in m_Item.GetMobilesInRange( 0 ) )
  							{
  								if ( (m.Z + 16) > m_Item.Z && (m_Item.Z + 12) > m.Z && (!Core.AOS || m != caster) && SpellHelper.ValidIndirectTarget( caster, m ) && caster.CanBeHarmful( m, false ) )
  									m_Queue.Enqueue( m );
  							}
  
  							while ( m_Queue.Count > 0 )
  							{
  								Mobile m = (Mobile)m_Queue.Dequeue();
  								
  								if ( SpellHelper.CanRevealCaster( m ) )
  									caster.RevealingAction();
  
  								caster.DoHarmful( m );
  
  								int damage = m_Item.m_Damage;
  
  								if ( !Core.AOS && m.CheckSkill( SkillName.MagicResist, 0.0, 30.0 ) )
  								{
  									damage = 1;
  
  									m.SendLocalizedMessage( 501783 ); // You feel yourself resisting magical energy.
  								}
  
  								AOS.Damage( m, caster, damage, 0, 100, 0, 0, 0 );
  								m.PlaySound( 0x208 );
  
  								if ( m is BaseCreature )
  									((BaseCreature) m).OnHarmfulSpell( caster );
  							}
  						}
  					}
  				}
  			}
  		}
  
  		private class InternalTarget : Target
  		{
  			private FireFieldSpell m_Owner;
  
  			public InternalTarget( FireFieldSpell owner ) : base( Core.ML ? 10 : 12, true, TargetFlags.None )
  			{
  				m_Owner = owner;
  			}
  
  			protected override void OnTarget( Mobile from, object o )
  			{
  				if ( o is IPoint3D )
  
gt: 					m_Owner.Target( (IPoint3D)o );