using System;
using Server.Commands;
using Server.Items;
using Server.PathAlgorithms;
using Server.PathAlgorithms.FastAStar;
using Server.PathAlgorithms.SlowAStar;
using Server.Spells;
using Server.Targeting;

namespace Server
{
	public sealed class MovementPath
	{
		private readonly Map m_Map;
		private readonly Point3D m_Start;
		private readonly Point3D m_Goal;
		private readonly Direction[] m_Directions = null;

		public Map Map{ get{ return m_Map; } }
		public Point3D Start{ get{ return m_Start; } }
		public Point3D Goal{ get{ return m_Goal; } }
		public Direction[] Directions{ get{ return m_Directions; } }
		public bool Success{ get{ return ( m_Directions != null && m_Directions.Length > 0 ); } }

		public static void Initialize()
		{
			CommandSystem.Register( "Path", AccessLevel.GameMaster, Path_OnCommand );
		}

		public static void Path_OnCommand( CommandEventArgs e )
		{
			e.Mobile.BeginTarget( -1, true, TargetFlags.None, Path_OnTarget );
			e.Mobile.SendMessage( "Target a location and a path will be drawn there." );
		}

		private static void Path( Mobile from, IPoint3D p, PathAlgorithm alg, string name, int zOffset )
		{
			m_OverrideAlgorithm = alg;

			long start = DateTime.Now.Ticks;
			MovementPath path = new MovementPath( from, new Point3D( p ) );
			long end = DateTime.Now.Ticks;
			double len = Math.Round( (end-start) / 10000.0, 2 );

			if ( !path.Success )
			{
				from.SendMessage( "{0} path failed: {1}ms", name, len );
			}
			else
			{
				from.SendMessage( "{0} path success: {1}ms", name, len );

				int x = from.X;
				int y = from.Y;
				int z = from.Z;

				for ( int i = 0; i < path.Directions.Length; ++i )
				{
					Movement.Movement.Offset( path.Directions[i], ref x, ref y );

					new RecallRune().MoveToWorld( new Point3D( x, y, z+zOffset ), from.Map );
				}
			}
		}

		public static void Path_OnTarget( Mobile from, object obj )
		{
			IPoint3D p = obj as IPoint3D;

			if ( p == null )
				return;

			SpellHelper.GetSurfaceTop( ref p );

			Path( from, p, FastAStarAlgorithm.Instance, "Fast", 0 );
			Path( from, p, SlowAStarAlgorithm.Instance, "Slow", 2 );
			m_OverrideAlgorithm = null;

			/*MovementPath path = new MovementPath( from, new Point3D( p ) );

			if ( !path.Success )
			{
				from.SendMessage( "No path to there could be found." );
			}
			else
			{
				//for ( int i = 0; i < path.Directions.Length; ++i )
				//	Timer.DelayCall( TimeSpan.FromSeconds( 0.1 + (i * 0.3) ), new TimerStateCallback( Pathfind ), new object[]{ from, path.Directions[i] } );
				int x = from.X;
				int y = from.Y;
				int z = from.Z;

				for ( int i = 0; i < path.Directions.Length; ++i )
				{
					Movement.Movement.Offset( path.Directions[i], ref x, ref y );

					new Items.RecallRune().MoveToWorld( new Point3D( x, y, z ), from.Map );
				}
			}*/
		}

		public static void Pathfind( object state )
		{
			object[] states = (object[])state;
			Mobile from = (Mobile) states[0];
			Direction d = (Direction) states[1];

			try
			{
				from.Direction = d;
				from.NetState.BlockAllPackets=true;
				from.Move( d );
				from.NetState.BlockAllPackets=false;
				from.ProcessDelta();
			}
			catch
			{
			}
		}

		private static PathAlgorithm m_OverrideAlgorithm;

		public static PathAlgorithm OverrideAlgorithm
		{
			get{ return m_OverrideAlgorithm; }
			set{ m_OverrideAlgorithm = value; }
		}

		public MovementPath( Mobile m, Point3D goal )
		{
			Point3D start = m.Location;
			Map map = m.Map;

			m_Map = map;
			m_Start = start;
			m_Goal = goal;

			if ( map == null || map == Map.Internal )
				return;

			if ( Utility.InRange( start, goal, 1 ) )
				return;

			try
			{
				PathAlgorithm alg = m_OverrideAlgorithm;

				if ( alg == null )
				{
					alg = FastAStarAlgorithm.Instance;

					if ( !alg.CheckCondition( m, map, start, goal ) )
						alg = SlowAStarAlgorithm.Instance;
				}

                //if ( !alg.CheckCondition( m, map, start, goal ) )	// SlowAstar is still broken
                //	alg = SlowAStarAlgorithm.Instance;		// TODO: Fix SlowAstar
            }
			catch ( Exception e )
			{
				Console.WriteLine( "Warning: {0}: Pathing error from {1} to {2}", e.GetType().Name, start, goal );
			}
		}
	}
}