// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using Microsoft.Extensions.Logging;

namespace Microsoft.AspNetCore.Server.HttpSys
{
    /// <summary>
    /// Rule that maintains a handle to the Request Queue and UrlPrefix to
    /// delegate to.
    /// </summary>
    public class DelegationRule : IDisposable
    {
        private readonly ILogger _logger;
        private readonly UrlGroup _sourceQueueUrlGroup;
        private bool _disposed;

        /// <summary>
        /// The name of the Http.Sys request queue
        /// </summary>
        public string QueueName { get; }

        /// <summary>
        /// The URL of the Http.Sys Url Prefix
        /// </summary>
        public string UrlPrefix { get; }

        internal RequestQueue Queue { get; }

        internal DelegationRule(UrlGroup sourceQueueUrlGroup, string queueName, string urlPrefix, ILogger logger)
        {
            _sourceQueueUrlGroup = sourceQueueUrlGroup;
            _logger = logger;
            QueueName = queueName;
            UrlPrefix = urlPrefix;
            Queue = new RequestQueue(queueName, _logger);
        }

        /// <inheritdoc />
        public void Dispose()
        {
            if (_disposed)
            {
                return;
            }

            _disposed = true;

            try
            {
                _sourceQueueUrlGroup.UnSetDelegationProperty(Queue, throwOnError: false);
            }
            catch (ObjectDisposedException) { /* Server may have been shutdown */ }
            Queue.Dispose();
        }
    }
}
