using System.Text.RegularExpressions;

namespace ShareeBike.Repository.Exception
{
	public class NotAtStationException : InvalidResponseException
	{
		public const string RETURNBIKE_FAILURE_STATUS_MESSAGE_CODE = "FAILURE 2178:";

		/// <summary> COPRI response status regular expression to extract detail information. </summary>
		public const string RETURNBIKE_FAILURE_STATUS_MESSAGE_UPPERCASE = "(BIKE [A-Za-z0-9_]+ OUT OF GEO FENCING\\. )([0-9]+)( METER DISTANCE TO NEXT STATION )([A-Za-z0-9_]+)";

		/// <summary> Prevents invalid use of exception. </summary>
		private NotAtStationException() : base(typeof(NotAtStationException).Name)
		{
		}

		public static bool IsNotAtStation(string responseState, out NotAtStationException exception)
		{
			// Check if there are too many bikes requested/ booked.
			var response = responseState.Trim().ToUpper();

			if (!response.StartsWith(RETURNBIKE_FAILURE_STATUS_MESSAGE_CODE))
			{
				exception = null;
				return false;
			}

			var match = Regex.Match(
				responseState.ToUpper(),
				RETURNBIKE_FAILURE_STATUS_MESSAGE_UPPERCASE);
			if (match.Groups.Count != 5
				|| !int.TryParse(match.Groups[2].ToString(), out int meters))
			{
				exception = new NotAtStationException();
				return true;
			}
			
			exception = new NotAtStationException {
				Distance = meters,
				StationNr = match.Groups[4].ToString()
			};

			return true;
		}

		/// <summary> Holds the distance to next station.</summary>
		public int? Distance { get; private set; } = null;

		/// <summary> Holds the id of next station.</summary>
		public string StationNr { get; private set; } = string.Empty;
	}
}