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

using System.Text.RegularExpressions;

namespace TINK.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; }
    }
}