using System;

namespace bsmd.AIS2Service
{
    internal class NMEA_AIS_Sentence : NMEA
    {

        #region fields

        private int total_sentence_nr;
        private int msg_sentence_nr;
        private string seq_message_ident;
        private string ais_channel_nr;
        private string ais_message;
        private int fillbits;

        #endregion

        #region Properties

        /// <summary>
        /// 1-based total number of sentences for this ais message
        /// </summary>
        public int Total_Sentence_Nr
        {
            get { return this.total_sentence_nr; }
        }

        /// <summary>
        /// 1-based fragment number of sentences
        /// </summary>
        public int Msg_Sentence_Nr
        {
            get { return this.msg_sentence_nr; }
        }

        /// <summary>
        /// sequential message id for multi-sentence messages (can be empty)
        /// </summary>
        public string Seq_Message_Ident
        {
            get { return this.seq_message_ident; }
        }

        /// <summary>
        /// 'A' = 161.975Mhz (87B),
        /// 'B' = 162.025Mhz (88B)
        /// </summary>
        public string AIS_Channel_nr
        {
            get { return this.ais_channel_nr; }
        }

        /// <summary>
        /// AIS message data
        /// </summary>
        public string AIS_Message
        {
            get { return this.ais_message; }
        }

        public int FillBits
        {
            get { return this.fillbits; }
        }

        #endregion

        #region abstract method implementation

        protected override void Decode()
        {
            this.total_sentence_nr = Convert.ToInt32(this.elements[1]);
            this.msg_sentence_nr = Convert.ToInt32(this.elements[2]);            
            this.seq_message_ident = this.elements[3]; // can be an empty string
            this.ais_channel_nr = this.elements[4];
            this.ais_message = this.elements[5];
            try
            {
                string fillbits_string = this.elements[6].Substring(0, this.elements[6].IndexOf('*'));
                if(!Int32.TryParse(fillbits_string, out this.fillbits))
                    _log.Warn("AIS_Sentence.Decode(): fillbits are no integer");                
            }
            catch (ArgumentOutOfRangeException)
            {
                _log.Warn("AIS_Sentence.Decode(): split() problem, trouble decoding fillbits");
            }
        }

        #endregion

    }
}