using System;
using System.Collections.Generic;
using System.Text;

namespace bsmd.AIS2Service
{
    public class AIS_Target
    {

        #region private members

        public static TimeSpan dbUpdateInterval = new TimeSpan(0, 2, 0); // neue Position in DB schreiben (min Interval)
        private int mmsi;
        private bool isClassB = false;
        private bool? isWatchkeeper = null;        
        private DateTime? lastUpdate;
        private bool updateDB = false;
        private string name;
        private string station;
        private string lastDBName;
        private string callSign;
        private bool selected = false;

        private AISClass staticInfo;
        private AISClass posReport;
        private AISClass lastAdditionalData;        

        private AIS_Target.Type type = Type.OTHER;
        private AIS_Target.NavStatus navStatus = AIS_Target.NavStatus.UNKNOWN;

        #endregion

        #region public defs
       
        public enum Type
        {
            PASSENGER,
            CARGO,
            TANKER,
            HSC,
            WIG,
            TUG,
            YACHT,
            OTHER
        }

        /// <summary>
        /// vereinfacht
        /// </summary>
        public enum NavStatus
        {
            UNKNOWN,
            UNDERWAY,
            MOORED
        }

        #endregion

        #region Construction

        public AIS_Target(int mmsi)
        {
            this.mmsi = mmsi;
        }

        #endregion

        #region Properties                

        public int MMSI
        {
            get { return this.mmsi; }
        }

        public DateTime? LastUpdate
        {
            get { return this.lastUpdate; }
        }

        public string Name
        {
            get {
                if ((this.name == null) || (this.name.Length == 0))
                    return this.LastDBName;
                return this.name; 
            }
            set { this.name = value; }
        }

        public string Callsign
        {
            get { return this.callSign; }
            set { this.callSign = value; }
        }

        public string LastDBName
        {
            get { return this.lastDBName; }
            set { this.lastDBName = value; }
        }

        public string ReceivedFrom
        {
            get { return this.station; }            
        }

        internal AISClass LastPosReport
        {
            get { return this.posReport; }
        }

        internal AISClass LastStaticData
        {
            get { return this.staticInfo; }
        }

        public double? Latitude
        {
            get
            {
                if (this.LastPosReport == null) return null;
                if (this.LastPosReport is AIS_PosReport)
                    return ((AIS_PosReport)this.LastPosReport).Latitude;
                if (this.LastPosReport is AIS_ClassB)
                    return ((AIS_ClassB)this.LastPosReport).Latitude;
                if (this.LastPosReport is AIS_ClassBExt)
                    return ((AIS_ClassBExt)this.LastPosReport).Latitude;
                return null;
            }
        }

        public Type TargetType
        {
            get { return this.type; }
            set { this.type = value; }
        }

        public NavStatus TargetNavStatus
        {
            get { return this.navStatus; }
        }

        public double? Longitude
        {
            get
            {
                if (this.LastPosReport == null) return null;
                if (this.LastPosReport is AIS_PosReport)
                    return ((AIS_PosReport)this.LastPosReport).Longitude;
                if (this.LastPosReport is AIS_ClassB)
                    return ((AIS_ClassB)this.LastPosReport).Longitude;
                if (this.LastPosReport is AIS_ClassBExt)
                    return ((AIS_ClassBExt)this.LastPosReport).Longitude;
                return null;
            }
        }

        public bool? IsClassB
        {
            get
            {
                return this.isClassB;                
            }
        }

        public int? Heading
        {
            get
            {
                if (this.LastPosReport == null) return null;
                if (this.LastPosReport is AIS_PosReport)
                    return ((AIS_PosReport)this.LastPosReport).TrueHeading;
                if (this.LastPosReport is AIS_ClassB)
                    return ((AIS_ClassB)this.LastPosReport).TrueHeading;
                if (this.LastPosReport is AIS_ClassBExt)
                    return ((AIS_ClassBExt)this.LastPosReport).TrueHeading;
                return null;
            }
        }

        public int? COG
        {
            get
            {
                if (this.LastPosReport == null) return null;
                if (this.LastPosReport is AIS_PosReport)
                    return (int)((AIS_PosReport)this.LastPosReport).COG;
                if (this.LastPosReport is AIS_ClassB)
                    return (int)((AIS_ClassB)this.LastPosReport).Cog;
                if (this.LastPosReport is AIS_ClassBExt)
                    return (int) ((AIS_ClassBExt)this.LastPosReport).Cog;
                return null;
            }
        }

        public bool? IsWatchkeeperShip
        {
            get { return this.isWatchkeeper; }
            set { this.isWatchkeeper = value; }
        }

        public bool Selected
        {
            get { return this.selected; }
            set { this.selected = value; }
        }

        public string Station
        {
            get { return this.station; }
            set { this.station = value; }
        }

        #endregion

        #region public methods       

        public static AIS_Target.NavStatus GetCurrentNavstatus(int status)
        {
            AIS_Target.NavStatus result = NavStatus.UNKNOWN;
            switch (status)
            {
                case 0:
                case 8:
                    result = NavStatus.UNDERWAY;
                    break;
                default:
                    result = NavStatus.MOORED;
                    break;
            }
            return result;
        }

        internal void Update(AISClass message)
        {            

            switch (message.MessageType)
            {
                case AISClass.AISType.POSITION_REPORT:
                case AISClass.AISType.POSITION_REPORT_ASSIGNED:
                case AISClass.AISType.POSITION_REPORT_SPECIAL:                
                    if ((this.lastUpdate.HasValue &&
                        (((AIS_PosReport)message).Timestamp - this.lastUpdate.Value) > AIS_Target.dbUpdateInterval)
                        || (!this.lastUpdate.HasValue))
                    {
                        this.updateDB = true;
                        this.lastUpdate = ((AIS_PosReport)message).Timestamp;
                    }
                    this.posReport = message;
                    this.navStatus = AIS_Target.GetCurrentNavstatus(((AIS_PosReport)message).NavStatusVal);
                    // System.Diagnostics.Trace.WriteLine(string.Format("pos report at {0}", this.lastUpdate));
                    break;
                case AISClass.AISType.POSITION_REPORT_B_EQUIP:
                    if ((this.lastUpdate.HasValue &&
                        (((AIS_ClassB)message).Timestamp - this.lastUpdate.Value) > AIS_Target.dbUpdateInterval)
                        || (!this.lastUpdate.HasValue))
                    {
                        this.updateDB = true;
                        this.lastUpdate = ((AIS_ClassB)message).Timestamp;
                        this.isClassB = true;
                        this.type = Type.YACHT;
                        this.navStatus = NavStatus.UNDERWAY;
                    }
                    this.posReport = message;                    
                    break;
                case AISClass.AISType.POSITION_REPORT_B_EQUIP_EXT:
                    if ((this.lastUpdate.HasValue &&
                        (((AIS_ClassBExt)message).Timestamp - this.lastUpdate.Value) > AIS_Target.dbUpdateInterval)
                        || (!this.lastUpdate.HasValue))
                    {
                        this.updateDB = true;
                        this.lastUpdate = ((AIS_ClassBExt)message).Timestamp;
                        this.isClassB = true;
                        this.type = Type.YACHT;
                        this.navStatus = NavStatus.UNDERWAY;
                    }                    
                    this.posReport = message;
                    break;                    
                case AISClass.AISType.STATIC_VOYAGE_DATA:
                    this.staticInfo = message;
                    this.name = ((AIS_StaticData)message).Name;
                    this.callSign = ((AIS_StaticData)message).Callsign;
                    //this.type = AIS_StaticData.GetShipTypeSimple(((AIS_StaticData)message).ShipTypeVal);                   

                    break;
                case AISClass.AISType.CLASS_B_STATIC_DATA:
                    if (((AIS_ClassBStatic)message).IsPartA)
                    {
                        this.name = ((AIS_ClassBStatic)message).Name;
                    }
                    else
                    {
                        this.callSign = ((AIS_ClassBStatic)message).Callsign;                        
                    }
                    this.staticInfo = message;                                        
                    this.type = Type.YACHT;
                    this.isClassB = true;                    
                    break;
                default:
                    this.lastAdditionalData = message;
                    break;
            }            

        }

        #endregion

        #region overrides

        public override string ToString()
        {
            return string.Format("{0} [{1}]", this.Name, this.MMSI);
        }

        #endregion

    }
}