using System;
using System.Collections;
using System.Text;
using log4net;

namespace bsmd.AIS2Service
{
    internal class AIS_ClassBStatic : AISClass
    {
        #region private members

        private int repeatIndicator;        
        private int partNumber;
        private string name;
        private int shipType;
        private string vendorId;
        private string callsign;
        private int dimension;
        private int spare;
        private static readonly ILog _log = LogManager.GetLogger(typeof(AIS_ClassBStatic));

        #endregion

        #region Properties        

        public bool IsPartA
        {
            get { return this.partNumber == 0; }
        }

        public bool IsPartB
        {
            get { return this.partNumber == 1; }
        }        

        public string Name
        {
            get { return this.name; }
        }        

        public string VendorId
        {
            get { return this.vendorId; }
        }

        public string Callsign
        {
            get { return this.callsign; }
        }

        public int ShipTypeVal
        {
            get { return this.shipType; }
        }    

        public int Dimension { get { return this.dimension; } }

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

        public int? UnitModelCode {get; private set;}

        public int? Serial { get; private set; }

        public int Length { get; private set; }

        public int Breadth { get; private set; }

        public int? MothershipMMSI { get; private set; }

        #endregion

        #region abstract method implementation

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

            try
            {
                int type = GetInt(bits, 0, 5);
                if (type != 24)
                {
                    result = Status.ILLEGAL_ARGUMENT;
                }
                else
                {
                    this.repeatIndicator = GetInt(bits, 6, 7);
                    _mmsi = GetInt(bits, 8, 37);
                    this.partNumber = GetInt(bits, 38, 39);
                    if (this.IsPartA)
                    {
                        StringBuilder sb_name = new StringBuilder(20);
                        for (int i = 0; i < 20; i++)
                        {
                            int cval = GetInt(bits, 40 + (6 * i), 45 + (6 * i));
                            char ch = GetAISChar(cval);
                            if (ch == '@') ch = ' ';
                            sb_name.Append(ch);
                        }
                        this.name = sb_name.ToString().Trim();
                    }
                    else
                    {
                        this.shipType = GetInt(bits, 40, 47);

                        StringBuilder sb_vendor = new StringBuilder(7);
                        for (int i = 0; i < 3; i++)
                        {
                            int cval = GetInt(bits, 48 + (6 * i), 53 + (6 * i));
                            char ch = GetAISChar(cval);
                            if (ch == '@') ch = ' ';
                            sb_vendor.Append(ch);
                        }
                        this.vendorId = sb_vendor.ToString().Trim();
                        this.UnitModelCode = GetInt(bits, 66, 69);
                        this.Serial = GetInt(bits, 70, 89);

                        StringBuilder sb_callsign = new StringBuilder(7);
                        for (int i = 0; i < 7; i++)
                        {
                            int cval = GetInt(bits, 90 + (6 * i), 95 + (6 * i));
                            char ch = GetAISChar(cval);
                            if (ch == '@') ch = ' ';
                            sb_callsign.Append(ch);
                        }
                        this.callsign = sb_callsign.ToString().Trim();                        

                        int toBow = GetInt(bits, 132, 140);
                        int toStern = GetInt(bits, 141, 149);
                        this.Length = toBow + toStern;
                        int toPort = GetInt(bits, 150, 155);
                        int toStarboard = GetInt(bits, 156, 161);
                        this.Breadth = toPort + toStarboard;
                        
                        this.dimension = GetInt(bits, 141, 161);
                        this.spare = GetInt(bits, 162, 167);
                    }
                }
            }
            catch (Exception e)
            {
                _log.WarnFormat("Error decoding AIS class B static data: {0}", e.Message);
                result = Status.PARSE_ERROR;
            }

            return result;
        }

        #endregion

    }
}