/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;

using Apache.NMS.Stomp.Transport.Tcp;

namespace Apache.NMS.Stomp.Transport
{
    public class TransportFactory
    {
        public static event ExceptionListener OnException;

        public static void HandleException(Exception ex)
        {
            if(TransportFactory.OnException != null)
            {
                TransportFactory.OnException(ex);
            }
        }

        /// <summary>
        /// Creates a normal transport.
        /// </summary>
        /// <param name="location"></param>
        /// <returns>the transport</returns>
        public static ITransport CreateTransport(Uri location)
        {
            ITransportFactory tf = TransportFactory.CreateTransportFactory(location);
            return tf.CreateTransport(location);
        }

        public static ITransport CompositeConnect(Uri location)
        {
            ITransportFactory tf = TransportFactory.CreateTransportFactory(location);
            return tf.CompositeConnect(location);
        }

        public static ITransport AsyncCompositeConnect(Uri location, SetTransport setTransport)
        {
            ITransportFactory tf = TransportFactory.CreateTransportFactory(location);
            return tf.CompositeConnect(location, setTransport);
        }

        /// <summary>
        /// Create a transport factory for the scheme.  If we do not support the transport protocol,
        /// an NMSConnectionException will be thrown.
        /// </summary>
        /// <param name="location"></param>
        /// <returns></returns>
        private static ITransportFactory CreateTransportFactory(Uri location)
        {
            string scheme = location.Scheme;

            if(null == scheme || 0 == scheme.Length)
            {
                throw new NMSConnectionException(String.Format("Transport scheme invalid: [{0}]", location.ToString()));
            }

            ITransportFactory factory = null;

            try
            {
                switch(scheme.ToLower())
                {
                case "tcp":
                    factory = new TcpTransportFactory();
                    break;
                case "ssl":
                    factory = new SslTransportFactory();
                    break;
                default:
                    throw new NMSConnectionException(String.Format("The transport {0} is not supported.", scheme));
                }
            }
            catch(NMSConnectionException)
            {
                throw;
            }
            catch
            {
                throw new NMSConnectionException("Error creating transport.");
            }

            if(null == factory)
            {
                throw new NMSConnectionException("Unable to create a transport.");
            }

            return factory;
        }
    }
}