using System.Text;

namespace DatabaseImport.ISO
{
    public class IsoCode
    {
        private readonly char[] _isoCodeFull = { '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0' };

        private char _testObject
        {
            get => _isoCodeFull[0];
            set => _isoCodeFull[0] = value;
        }
        private char _position
        {
            get => _isoCodeFull[1];
            set => _isoCodeFull[1] = value;
        }
        private char[] _mainLocation
        {
            get => new[] { _isoCodeFull[2], _isoCodeFull[3], _isoCodeFull[4], _isoCodeFull[5] };
            set
            {
                for (var i = 0; i < 4; i++)
                {
                    if (value.Length <= i) { _isoCodeFull[i + 2] = '0'; }
                    else { _isoCodeFull[i + 2] = value[i]; }
                }
            }
        }
        private char[] _fineLocation1
        {
            get => new[] { _isoCodeFull[6], _isoCodeFull[7] };
            set
            {
                for (var i = 0; i < 2; i++)
                {
                    _isoCodeFull[i + 6] = value.Length < i ? '0' : value[i];
                }
            }
        }
        private char[] _fineLocation2
        {
            get => new[] { _isoCodeFull[8], _isoCodeFull[9] };
            set
            {
                for (var i = 0; i < 2; i++)
                {
                    if (value.Length < i) { _isoCodeFull[i + 8] = '0'; }
                    else { _isoCodeFull[i + 8] = value[i]; }
                }
            }
        }
        private char[] _fineLocation3
        {
            get => new[] { _isoCodeFull[10], _isoCodeFull[11] };
            set
            {
                for (var i = 0; i < 2; i++)
                {
                    if (value.Length < i) { _isoCodeFull[i + 10] = '0'; }
                    else { _isoCodeFull[i + 10] = value[i]; }
                }
            }
        }
        private char[] _physicalDimension
        {
            get => new[] { _isoCodeFull[12], _isoCodeFull[13] };
            set
            {
                for (var i = 0; i < 2; i++)
                {
                    if (value.Length < i) { _isoCodeFull[i + 12] = '0'; }
                    else { _isoCodeFull[i + 12] = value[i]; }
                }
            }
        }
        private char _direction
        {
            get => _isoCodeFull[14];
            set => _isoCodeFull[14] = value;
        }
        private char _filterClass
        {
            get => _isoCodeFull[15];
            set => _isoCodeFull[15] = value;
        }
        public IsoCode(string isoCode)
        {
            if (null == isoCode) { isoCode = ""; }
            if (isoCode.Length > 16) { isoCode = isoCode.Substring(0, 16); }
            if (isoCode.Length < 16)
            {
                isoCode = isoCode.PadRight(16, '?');
            }
            for (var i = 0; i < 16; i++) { _isoCodeFull[i] = isoCode[i]; }
        }
        public string StringRepresentation
        {
            get
            {
                var sb = new StringBuilder();
                foreach (var c in _isoCodeFull) { sb.Append(c); }
                return sb.ToString();
            }
            set
            {
                for (var i = 0; i < 16; i++)
                {
                    if (i >= value.Length) { _isoCodeFull[i] = '0'; }
                    else { _isoCodeFull[i] = value[i]; }
                }
            }
        }
        /// <summary>
        /// returns the isocode for a channel
        /// considers whether it should mask the test time fields in the isocode 
        /// test time fields are test object, and filterclass
        /// returns isocode
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="careAboutTestTimeFields"></param>
        /// <returns></returns>
        public static string GetString(MMEPossibleChannels channel, bool careAboutTestTimeFields)
        {
            var iso = new IsoCode("")
            {
                _direction = channel.Direction[0],
                _fineLocation1 = channel.Fine_Loc_1.ToCharArray(),
                _fineLocation2 = channel.Fine_Loc_2.ToCharArray(),
                _fineLocation3 = channel.Fine_Loc_3.ToCharArray(),
                _mainLocation = channel.Trans_Main_Loc.ToCharArray(),
                _physicalDimension = channel.Physical_Dimension.ToCharArray(),
                _position = channel.Position[0],
                _testObject = careAboutTestTimeFields ? channel.Test_Object[0] : '?',
                _filterClass = careAboutTestTimeFields ? channel.Default_Filter_Class[0] : '?'
            };
            return iso.StringRepresentation;
        }
        public static string GetString(string testObject, string position, string main, string floc1, string floc2, string floc3, string physdim, string dir, string fc)
        {
            return $"{testObject}{position}{main}{floc1}{floc2}{floc3}{physdim}{dir}{fc}";
        }
    }
}