using Server.Network;

namespace Server.Items
{
    public class MarinersBrassSextant : Sextant
    {
        public override int LabelNumber => 1075499;  // Mariner's Brass Sextant

        [Constructable]
        public MarinersBrassSextant()
            : base()
        {
            LootType = LootType.Blessed;
            Hue = 483;
        }

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

        public override void Serialize(GenericWriter writer)
        {
            base.Serialize(writer);
            writer.Write(0); // version
        }
        public override void Deserialize(GenericReader reader)
        {
            base.Deserialize(reader);
            reader.ReadInt();
        }
    }

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

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

        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.Trammel || map == Map.Felucca)
            {
                if (x >= 0 && y >= 0 && x < 5120 && y < 4096)
                {
                    xCenter = 1323;
                    yCenter = 1624;
                }
                else if (x >= 5120 && y >= 2304 && x < 6144 && y < 4096)
                {
                    xCenter = 5936;
                    yCenter = 3112;
                }
                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;
        }

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

            writer.Write(0); // version
        }

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

            int version = reader.ReadInt();
        }

        public override void OnDoubleClick(Mobile from)
        {
            string coords = GetCoords(from);

            if (!string.IsNullOrEmpty(coords))
            {
                from.LocalOverheadMessage(MessageType.Regular, from.SpeechHue, false, GetCoords(from));
            }
        }

        public static string GetCoords(IEntity e)
        {
            return GetCoords(e.Location, e.Map);
        }

        public static string GetCoords(Point3D location, Map map)
        {
            int xLong = 0, yLat = 0;
            int xMins = 0, yMins = 0;
            bool xEast = false, ySouth = false;

            if (Format(location, map, ref xLong, ref yLat, ref xMins, ref yMins, ref xEast, ref ySouth))
            {
                return string.Format("{0}° {1}'{2}, {3}° {4}'{5}", yLat, yMins, ySouth ? "S" : "N", xLong, xMins, xEast ? "E" : "W");
            }

            return string.Empty;
        }
    }
}