using System;
using System.Collections;
using System.Diagnostics;
using log4net;

namespace bsmd.AIS2Service
{
    internal class AIS_PosReport : AISClass
    {
        private Guid? id;
        private int navstatus;
        private int rot;
        private int sog;
        private int accur;
        private int longitude;
        private int latitude;
        private int cog;
        private int trueheading;
        private DateTime timestamp;
        private int utcTimeSecond;
        private int reserved;
        private int spare;
        private int raim;
        private int commstate;

        private static readonly ILog _log = LogManager.GetLogger(typeof(AIS_PosReport));

        #region Properties

        public Guid Id { get { if (!this.id.HasValue) this.id = Guid.NewGuid(); return this.id.Value; } }

        public int NavStatusVal { get { return this.navstatus; } }
        public int ROTVal { get { return this.rot; } }
        public int SOGVal { get { return this.sog; } }
        public int COGVal { get { return this.cog; } }
        public int Accuracy { get { return this.accur; } }
        public int LatitudeVal { get { return this.latitude; } }
        public int LongitudeVal { get { return this.longitude; } }
        public string DBTimestamp
        {
            get
            {
                return this.timestamp.ToString("yyyy-MM-ddTHH:mm:ss.000Z");
            }
        }           

        public double SOG
        {
            get
            {
                return ((double)this.sog) / 10.0f;
            }
        }

        public double COG
        {
            get
            {
                return ((double)this.cog) / 10.0f;
            }
        }

        public int ROT
        {
            get
            {
                return (int)((double)(this.rot * this.rot) / 22.401289);
            }
        }

        public double Latitude
        {
            get
            {
                return ((double)this.latitude) / 600000.0f;
            }
        }

        public double Longitude
        {
            get
            {
                return ((double)this.longitude) / 600000.0f;
            }
        }


        public string NavStatus
        {
            get { return GetNavStatus(this.navstatus); }
        }

        public DateTime Timestamp
        {
            get { return this.timestamp; }
        }

        public int? TrueHeading
        {
            get
            {
                if (this.trueheading == 511) return null;
                return this.trueheading;
            }
        }

        public int Reserved { get { return this.reserved; } }

        public int Spare { get { return this.spare; } }

        public int Raim { get { return this.raim; } }

        public int CommState { get { return this.commstate; } }

        #endregion

        #region static methods

        public static string GetNavStatus(int navstatus)
        {
            switch (navstatus)
            {
                case 0:
                    return "under way using engine";
                case 1:
                    return "at anchor";
                case 2:
                    return "not under command";
                case 3:
                    return "restricted manoeuvrability";
                case 4:
                    return "contrained by her draught";
                case 5:
                    return "moored";
                case 6:
                    return "aground";
                case 7:
                    return "engaged in fishing";
                case 8:
                    return "under way sailing";
                case 9:
                    return "reserved for future amendment of Navigational Status for HSC";
                case 10:
                    return "reserved for future amendment of Navigational Status for WIG";
                case 11:
                case 12:
                case 13:
                case 14:
                    return "reserved for future use";
                default:
                    return "not defined";
            }
        }

        #endregion

        #region overrides

        protected override Status Decode()
        {
            Status result = Status.OK;
            BitArray bits = DecodeBinary(_data);

            try
            {
                _mmsi = GetInt(bits, 8, 37);
                this.navstatus = GetInt(bits, 38, 41);
                this.rot = GetInt(bits, 42, 49);
                this.sog = GetInt(bits, 50, 59);
                this.accur = GetInt(bits, 60, 60);
                this.longitude = GetInt(bits, 61, 88);
                this.latitude = GetInt(bits, 89, 115);
                this.cog = GetInt(bits, 116, 127);
                this.trueheading = GetInt(bits, 128, 136);
                this.utcTimeSecond = GetInt(bits, 137, 142);
                this.reserved = GetInt(bits, 143, 146);
                this.spare = GetInt(bits, 147, 147);
                this.raim = GetInt(bits, 148, 148);
                this.commstate = GetInt(bits, 149, 167);
            }
            catch (Exception e)
            {
                _log.WarnFormat("Error decoding AIS pos report: {0}", e.Message);
                result = Status.PARSE_ERROR;
            }

            this.timestamp = DateTime.Now;
            return result;
        }

        public override string ToString()
        {
            return string.Format("{0} - MMSI {1}", base.ToString(), this.MMSI);
        }

        #endregion
    }
}