using System;
using Microsoft.SPOT;

namespace CPF
{
    public class NMEA_Integer
    {
        private bool    _valid;
        private bool    _updated;
        private long    _lastCommitTime;
        private int     _val;
        private int     _newval;

        public NMEA_Integer()
        {
            _valid = false;
            _updated = false;
            _val = 0;
            _lastCommitTime = 0;
        }

        public bool IsValid()
        {
            return _valid;
        }

        public bool IsUpdated()
        {
            return _updated;
        }

        public long Age()
        {
            return _valid ? Utils.MillisecondsSinceLastReboot() - _lastCommitTime : Conversions.MAX_SIGNED;
        }

        public void Commit() 
        {
            _val = _newval;
            _lastCommitTime = Utils.MillisecondsSinceLastReboot();
            _valid = _updated = true;
        }

        public void Set(ByteString s) 
        {
            _newval = (int) Conversions.ByteStringToInteger(s);
        }
    }
}