/*
 * 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 System.Collections.Specialized;
using System.Collections.Generic;
using Apache.NMS.Util;

namespace Apache.NMS.ActiveMQ.Commands
{
	/// <summary>
	/// Summary description for ActiveMQDestination.
	/// </summary>
	public abstract class ActiveMQDestination : BaseDataStructure, IDestination
	{
		/// <summary>
		/// Topic Destination object
		/// </summary>
		public const int ACTIVEMQ_TOPIC = 1;
		/// <summary>
		/// Temporary Topic Destination object
		/// </summary>
		public const int ACTIVEMQ_TEMPORARY_TOPIC = 2;
		/// <summary>
		/// Queue Destination object
		/// </summary>
		public const int ACTIVEMQ_QUEUE = 3;
		/// <summary>
		/// Temporary Queue Destination object
		/// </summary>
		public const int ACTIVEMQ_TEMPORARY_QUEUE = 4;
		/// <summary>
		/// prefix for Advisory message destinations
		/// </summary>
		public const String ADVISORY_PREFIX = "ActiveMQ.Advisory.";
		/// <summary>
		/// prefix for consumer advisory destinations
		/// </summary>
		public const String CONSUMER_ADVISORY_PREFIX = ADVISORY_PREFIX + "Consumers.";
		/// <summary>
		/// prefix for producer advisory destinations
		/// </summary>
		public const String PRODUCER_ADVISORY_PREFIX = ADVISORY_PREFIX + "Producers.";
		/// <summary>
		/// prefix for connection advisory destinations
		/// </summary>
		public const String CONNECTION_ADVISORY_PREFIX = ADVISORY_PREFIX + "Connections.";

		/// <summary>
		/// The default target for ordered destinations
		/// </summary>
		public const String DEFAULT_ORDERED_TARGET = "coordinator";

		private const String TEMP_PREFIX = "{TD{";
		private const String TEMP_POSTFIX = "}TD}";
		private const String COMPOSITE_SEPARATOR = ",";

		private String physicalName = "";
		private StringDictionary options = null;

		// Cached transient data
		private bool exclusive;
		private bool ordered;
		private bool advisory;
		private String orderedTarget = DEFAULT_ORDERED_TARGET;

		/// <summary>
		/// The Default Constructor
		/// </summary>
		protected ActiveMQDestination()
		{
		}

		/// <summary>
		/// Construct the Destination with a defined physical name;
		/// </summary>
		/// <param name="name"></param>
		protected ActiveMQDestination(String name)
		{
			setPhysicalName(name);
			//this.advisory = name != null && name.StartsWith(ADVISORY_PREFIX);
		}

		public bool IsTopic
		{
			get
			{
				int destinationType = GetDestinationType();
				return ACTIVEMQ_TOPIC == destinationType
					|| ACTIVEMQ_TEMPORARY_TOPIC == destinationType;
			}
		}

		public bool IsQueue
		{
			get
			{
				int destinationType = GetDestinationType();
				return ACTIVEMQ_QUEUE == destinationType
					|| ACTIVEMQ_TEMPORARY_QUEUE == destinationType;
			}
		}

		public bool IsTemporary
		{
			get
			{
				int destinationType = GetDestinationType();
				return ACTIVEMQ_TEMPORARY_QUEUE == destinationType
					|| ACTIVEMQ_TEMPORARY_TOPIC == destinationType;
			}
		}

		/// <summary>
		/// Dictionary of name/value pairs representing option values specified
		/// in the URI used to create this Destination.  A null value is returned
		/// if no options were specified.
		/// </summary>
		internal StringDictionary Options
		{
			get { return this.options; }
		}

		private void setPhysicalName(string name)
		{
			this.physicalName = name;

			int p = name.IndexOf('?');
			if(p >= 0)
			{
				String optstring = physicalName.Substring(p + 1);
				this.physicalName = name.Substring(0, p);
				options = URISupport.ParseQuery(optstring);
			}
		}

		/// <summary>
		/// </summary>
		/// <returns>Returns the advisory.</returns>
		public bool IsAdvisory()
		{
			return advisory;
		}

		/// <summary>
		/// </summary>
		/// <param name="advisory">The advisory to set.</param>
		public void SetAdvisory(bool advisory)
		{
			this.advisory = advisory;
		}

		/// <summary>
		/// </summary>
		/// <returns>true if this is a destination for Consumer advisories</returns>
		public bool IsConsumerAdvisory()
		{
			return IsAdvisory() && physicalName.StartsWith(CONSUMER_ADVISORY_PREFIX);
		}

		/// <summary>
		/// </summary>
		/// <returns>true if this is a destination for Producer advisories</returns>
		public bool IsProducerAdvisory()
		{
			return IsAdvisory() && physicalName.StartsWith(PRODUCER_ADVISORY_PREFIX);
		}

		/// <summary>
		/// </summary>
		/// <returns>true if this is a destination for Connection advisories</returns>
		public bool IsConnectionAdvisory()
		{
			return IsAdvisory() && physicalName.StartsWith(CONNECTION_ADVISORY_PREFIX);
		}

		/// <summary>
		/// </summary>
		/// <returns>Returns the exclusive.</returns>
		public bool IsExclusive()
		{
			return exclusive;
		}

		/// <summary>
		/// </summary>
		/// <param name="exclusive">The exclusive to set.</param>
		public void SetExclusive(bool exclusive)
		{
			this.exclusive = exclusive;
		}

		/// <summary>
		/// </summary>
		/// <returns>Returns the ordered.</returns>
		public bool IsOrdered()
		{
			return ordered;
		}

		/// <summary>
		/// </summary>
		/// <param name="ordered">The ordered to set.</param>
		public void SetOrdered(bool ordered)
		{
			this.ordered = ordered;
		}

		/// <summary>
		/// </summary>
		/// <returns>Returns the orderedTarget.</returns>
		public String GetOrderedTarget()
		{
			return orderedTarget;
		}

		/// <summary>
		/// </summary>
		/// <param name="orderedTarget">The orderedTarget to set.</param>
		public void SetOrderedTarget(String orderedTarget)
		{
			this.orderedTarget = orderedTarget;
		}

		/// <summary>
		/// A helper method to return a descriptive string for the topic or queue
		/// </summary>
		/// <param name="destination"></param>
		/// <returns>a descriptive string for this queue or topic</returns>
		public static String Inspect(ActiveMQDestination destination)
		{
			if(destination is ITopic)
			{
				return "Topic(" + destination.ToString() + ")";
			}
			else
			{
				return "Queue(" + destination.ToString() + ")";
			}
		}

		/// <summary>
		/// </summary>
		/// <param name="destination"></param>
		/// <returns></returns>
		public static ActiveMQDestination Transform(IDestination destination)
		{
			ActiveMQDestination result = null;
			if(destination != null)
			{
				if(destination is ActiveMQDestination)
				{
					result = (ActiveMQDestination) destination;
				}
				else
				{
					if(destination is ITemporaryQueue)
					{
						result = new ActiveMQTempQueue(((IQueue) destination).QueueName);
					}
					else if(destination is ITemporaryTopic)
					{
						result = new ActiveMQTempTopic(((ITopic) destination).TopicName);
					}
					else if(destination is IQueue)
					{
						result = new ActiveMQQueue(((IQueue) destination).QueueName);
					}
					else if(destination is ITopic)
					{
						result = new ActiveMQTopic(((ITopic) destination).TopicName);
					}
				}
			}
			return result;
		}

		/// <summary>
		/// Create a Destination
		/// </summary>
		/// <param name="type"></param>
		/// <param name="pyhsicalName"></param>
		/// <returns></returns>
		public static ActiveMQDestination CreateDestination(int type, String pyhsicalName)
		{
			ActiveMQDestination result = null;
			if(pyhsicalName == null)
			{
				return null;
			}
			else switch(type)
			{
			    case ACTIVEMQ_TOPIC:
			        result = new ActiveMQTopic(pyhsicalName);
			        break;
			    case ACTIVEMQ_TEMPORARY_TOPIC:
			        result = new ActiveMQTempTopic(pyhsicalName);
			        break;
			    case ACTIVEMQ_QUEUE:
			        result = new ActiveMQQueue(pyhsicalName);
			        break;
			    default:
			        result = new ActiveMQTempQueue(pyhsicalName);
			        break;
			}
			return result;
		}

		/// <summary>
		/// Create a temporary name from the clientId
		/// </summary>
		/// <param name="clientId"></param>
		/// <returns></returns>
		public static String CreateTemporaryName(String clientId)
		{
			return TEMP_PREFIX + clientId + TEMP_POSTFIX;
		}

		/// <summary>
		/// From a temporary destination find the clientId of the Connection that created it
		/// </summary>
		/// <param name="destination"></param>
		/// <returns>the clientId or null if not a temporary destination</returns>
		public static String GetClientId(ActiveMQDestination destination)
		{
			String answer = null;
			if(destination != null && destination.IsTemporary)
			{
				String name = destination.PhysicalName;
				int start = name.IndexOf(TEMP_PREFIX);
				if(start >= 0)
				{
					start += TEMP_PREFIX.Length;
					int stop = name.LastIndexOf(TEMP_POSTFIX);
					if(stop > start && stop < name.Length)
					{
						answer = name.Substring(start, stop);
					}
				}
			}
			return answer;
		}

		/// <summary>
		/// </summary>
		/// <param name="o">object to compare</param>
		/// <returns>1 if this is less than o else 0 if they are equal or -1 if this is less than o</returns>
		public int CompareTo(Object o)
		{
			if(o is ActiveMQDestination)
			{
				return CompareTo((ActiveMQDestination) o);
			}
			return -1;
		}

		/// <summary>
		/// Lets sort by name first then lets sort topics greater than queues
		/// </summary>
		/// <param name="that">another destination to compare against</param>
		/// <returns>1 if this is less than o else 0 if they are equal or -1 if this is less than o</returns>
		public int CompareTo(ActiveMQDestination that)
		{
			int answer = 0;
			if(physicalName != that.physicalName)
			{
				if(physicalName == null)
				{
					return -1;
				}
				else if(that.physicalName == null)
				{
					return 1;
				}
				answer = physicalName.CompareTo(that.physicalName);
			}

			if(answer == 0)
			{
				if(IsTopic)
				{
					if(that.IsQueue)
					{
						return 1;
					}
				}
				else
				{
					if(that.IsTopic)
					{
						return -1;
					}
				}
			}
			return answer;
		}

		/// <summary>
		/// </summary>
		/// <returns>Returns the Destination type</returns>
		public abstract int GetDestinationType();

		public String PhysicalName
		{
			get { return this.physicalName; }
			set
			{
				this.physicalName = value;
				this.advisory = (value != null && value.StartsWith(ADVISORY_PREFIX));
			}
		}

        /// <summary>
        /// Gets the Destination Type of this Destination as a String value which is one
        /// of {Queue,Topic,TempQueue,TempTopic}.
        /// </summary>
        /// <returns>
        /// The Destination Type as a String.
        /// </returns>
        public String GetDestinationTypeAsString()
        {
            switch(GetDestinationType())
            {
                case ACTIVEMQ_QUEUE:
                    return "Queue";
                case ACTIVEMQ_TOPIC:
                    return "Topic";
                case ACTIVEMQ_TEMPORARY_QUEUE:
                    return "TempQueue";
                case ACTIVEMQ_TEMPORARY_TOPIC:
                    return "TempTopic";
                default:
                    throw new NMSException("Invalid destination type: " + GetDestinationType());
            }
        }

		/// <summary>
		/// Returns true if this destination represents a collection of
		/// destinations; allowing a set of destinations to be published to or subscribed
		/// from in one NMS operation.
		/// <p/>
		/// If this destination is a composite then you can call {@link #getChildDestinations()}
		/// to return the list of child destinations.
		/// </summary>
		public bool IsComposite
		{
			get
			{
				return physicalName.IndexOf(COMPOSITE_SEPARATOR) > 0;
			}
		}

        public ActiveMQDestination[] GetCompositeDestinations()
        {
            if (IsComposite)
            {
                LinkedList<String> list = new LinkedList<String>();
                String[] composites = physicalName.Split(COMPOSITE_SEPARATOR.ToCharArray());
                foreach(String composite in composites)
                {
                    if (String.IsNullOrEmpty(composite.Trim()))
                    {
                        continue;
                    }
                    list.AddLast(composite.Trim());
                }
                ActiveMQDestination[] compositeDestinations = new ActiveMQDestination[list.Count];
                int counter = 0;
                foreach(String destination in list)
                {
                    compositeDestinations[counter++] = CreateDestination(destination);
                }

                return compositeDestinations;
            }

            return new ActiveMQDestination[0];
        }

		/// <summary>
		/// </summary>
		/// <returns>string representation of this instance</returns>
		public override String ToString()
		{
			switch(DestinationType)
			{
			case DestinationType.Topic:
			return "topic://" + PhysicalName;

			case DestinationType.TemporaryTopic:
			return "temp-topic://" + PhysicalName;

			case DestinationType.TemporaryQueue:
			return "temp-queue://" + PhysicalName;

			default:
			return "queue://" + PhysicalName;
			}
		}

		/// <summary>
		/// </summary>
		/// <returns>hashCode for this instance</returns>
		public override int GetHashCode()
		{
			int answer = 37;

			if(this.physicalName != null)
			{
				answer = physicalName.GetHashCode();
			}
			if(IsTopic)
			{
				answer ^= 0xfabfab;
			}
			return answer;
		}

		/// <summary>
		/// if the object passed in is equivalent, return true
		/// </summary>
		/// <param name="obj">the object to compare</param>
		/// <returns>true if this instance and obj are equivalent</returns>
		public override bool Equals(Object obj)
		{
			bool result = this == obj;
			if(!result && obj != null && obj is ActiveMQDestination)
			{
				ActiveMQDestination other = (ActiveMQDestination) obj;
				result = this.GetDestinationType() == other.GetDestinationType()
					&& this.physicalName.Equals(other.physicalName);
			}
			return result;
		}

		/// <summary>
		/// </summary>
		/// <returns>true if the destination matches multiple possible destinations</returns>
		public bool IsWildcard()
		{
			if(physicalName != null)
			{
				return physicalName.IndexOf(DestinationFilter.ANY_CHILD) >= 0
					|| physicalName.IndexOf(DestinationFilter.ANY_DESCENDENT) >= 0;
			}
			return false;
		}

		/// <summary>
		/// Factory method to create a child destination if this destination is a composite
		/// </summary>
		/// <param name="name"></param>
		/// <returns>the created Destination</returns>
		public abstract ActiveMQDestination CreateDestination(String name);


		public abstract DestinationType DestinationType
		{
			get;
		}

		public override Object Clone()
		{
			// Since we are a derived class use the base's Clone()
			// to perform the shallow copy. Since it is shallow it
			// will include our derived class. Since we are derived,
			// this method is an override.
			ActiveMQDestination o = (ActiveMQDestination) base.Clone();

			// Now do the deep work required
			// If any new variables are added then this routine will
			// likely need updating

			return o;
		}
	}
}