using System;
using Server.Network;

namespace Server.Items
{
	public class Sextant : Item
	{
		[Constructable]
		public Sextant() : base( 0x1058 )
		{
			Weight = 2.0;
		}

		public Sextant( Serial serial ) : base( serial )
		{
		}

		public override void Serialize( GenericWriter writer )
		{
			base.Serialize( writer );

			writer.Write( (int) 0 ); // version
		}

		public override void Deserialize( GenericReader reader )
		{
			base.Deserialize( reader );

			int version = reader.ReadInt();
		}

		public override void OnDoubleClick( Mobile from )
		{
			int xLong = 0, yLat = 0;
			int xMins = 0, yMins = 0;
			bool xEast = false, ySouth = false;

			if ( Sextant.Format( from.Location, from.Map, ref xLong, ref yLat, ref xMins, ref yMins, ref xEast, ref ySouth ) )
			{
				string location = String.Format( "{0}° {1}'{2}, {3}° {4}'{5}", yLat, yMins, ySouth ? "S" : "N", xLong, xMins, xEast ? "E" : "W" );
				from.LocalOverheadMessage( MessageType.Regular, from.SpeechHue, false, location );
			}
		}

		public static bool ComputeMapDetails( Map map, int x, int y, out int xCenter, out int yCenter, out int xWidth, out int yHeight )
		{
			xWidth = 5120; yHeight = 4096;

			if ( map == Map.Britannia )
			{
				if ( x >= 0 && y >= 0 && x < 7168 && y < 4096 )
				{
					xCenter = 1323; yCenter = 1624;
				}
				else
				{
					xCenter = 0; yCenter = 0;
					return false;
				}
			}
			else if ( x >= 0 && y >= 0 && x < map.Width && y < map.Height )
			{
				xCenter = 1323; yCenter = 1624;
			}
			else
			{
				xCenter = 0; yCenter = 0;
				return false;
			}

			return true;
		}

		public static Point3D ReverseLookup( Map map, int xLong, int yLat, int xMins, int yMins, bool xEast, bool ySouth )
		{
			if ( map == null || map == Map.Internal )
				return Point3D.Zero;

			int xCenter, yCenter;
			int xWidth, yHeight;

			if ( !ComputeMapDetails( map, 0, 0, out xCenter, out yCenter, out xWidth, out yHeight ) )
				return Point3D.Zero;

			double absLong = xLong + ((double)xMins / 60);
			double absLat  = yLat  + ((double)yMins / 60);

			if ( !xEast )
				absLong = 360.0 - absLong;

			if ( !ySouth )
				absLat = 360.0 - absLat;

			int x, y, z;

			x = xCenter + (int)((absLong * xWidth) / 360);
			y = yCenter + (int)((absLat * yHeight) / 360);

			if ( x < 0 )
				x += xWidth;
			else if ( x >= xWidth )
				x -= xWidth;

			if ( y < 0 )
				y += yHeight;
			else if ( y >= yHeight )
				y -= yHeight;

			z = map.GetAverageZ( x, y );

			return new Point3D( x, y, z );
		}

		public static bool Format( Point3D p, Map map, ref int xLong, ref int yLat, ref int xMins, ref int yMins, ref bool xEast, ref bool ySouth )
		{
			if ( map == null || map == Map.Internal )
				return false;

			int x = p.X, y = p.Y;
			int xCenter, yCenter;
			int xWidth, yHeight;

			if ( !ComputeMapDetails( map, x, y, out xCenter, out yCenter, out xWidth, out yHeight ) )
				return false;

			double absLong = (double)((x - xCenter) * 360) / xWidth;
			double absLat  = (double)((y - yCenter) * 360) / yHeight;

			if ( absLong > 180.0 )
				absLong = -180.0 + (absLong % 180.0);

			if ( absLat > 180.0 )
				absLat = -180.0 + (absLat % 180.0);

			bool east = ( absLong >= 0 ), south = ( absLat >= 0 );

			if ( absLong < 0.0 )
				absLong = -absLong;

			if ( absLat < 0.0 )
				absLat = -absLat;

			xLong = (int)absLong;
			yLat  = (int)absLat;

			xMins = (int)((absLong % 1.0) * 60);
			yMins = (int)((absLat  % 1.0) * 60);

			xEast = east;
			ySouth = south;

			return true;
		}
	}
}