sharee.bike-App/SharedBusinessLogic/Repository/Exception/BookingDeclinedException.cs

using System.Text.RegularExpressions;

namespace ShareeBike.Repository.Exception
{
	/// <summary> Handles booking request which fail due to too many bikes requested/ booked.</summary>
	public class BookingDeclinedException : InvalidResponseException
	{
		/// <summary> Holds error description if user/ password combination is not valid. </summary>
		public const string BOOKING_FAILURE_STATUS_MESSAGE_UPPERCASE = "(OK: BOOKING_REQUEST DECLINED\\. MAX COUNT OF )([0-9]+)( OCCUPIED BIKES HAS BEEN REACHED)";

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

		/// <summary> Prevents invalid use of exception. </summary>
		public BookingDeclinedException(int maxBikesCount) : base(typeof(BookingDeclinedException).Name)
		{
			MaxBikesCount = maxBikesCount;
		}

		public static bool IsBookingDeclined(string responseState, out BookingDeclinedException exception)
		{
			// Check if there are too many bikes requested/ booked.
			var match = Regex.Match(
				responseState.ToUpper(),
				BOOKING_FAILURE_STATUS_MESSAGE_UPPERCASE);
			if (match.Groups.Count != 4
				|| !int.TryParse(match.Groups[2].ToString(), out int maxBikesCount))
			{
				exception = null;
				return false;
			}

			exception = new BookingDeclinedException(maxBikesCount);
			return true;
		}

		/// <summary> Holds the maximum count of bikes allowed to reserve/ book.</summary>
		public int MaxBikesCount { get; private set; }
	}
}