/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System.Collections;
using System.Collections.Generic;
using OpenSim.Framework.Servers;

namespace OpenSim.Region.Capabilities
{
    /// <summary>
    /// CapsHandlers is a cap handler container but also takes
    /// care of adding and removing cap handlers to and from the
    /// supplied BaseHttpServer.
    /// </summary>
    public class CapsHandlers
    {
        private Dictionary <string, IRequestHandler> m_capsHandlers = new Dictionary<string, IRequestHandler>();
        private BaseHttpServer m_httpListener;
        private string m_httpListenerHostName;
        private uint m_httpListenerPort;

        /// <summary></summary>
        /// <param name="httpListener">base HTTP server</param>
        /// <param name="httpListenerHostname">host name of the HTTP
        /// server</param>
        /// <param name="httpListenerPort">HTTP port</param>
        public CapsHandlers(BaseHttpServer httpListener, string httpListenerHostname, uint httpListenerPort)
        {
            m_httpListener = httpListener;
            m_httpListenerHostName = httpListenerHostname;
            m_httpListenerPort = httpListenerPort;
        }

        /// <summary>
        /// Remove the cap handler for a capability.
        /// </summary>
        /// <param name="capsName">name of the capability of the cap
        /// handler to be removed</param>
        public void Remove(string capsName) 
        {
            // This line must be here, or caps will break!
            m_httpListener.RemoveStreamHandler("POST", m_capsHandlers[capsName].Path);
            m_capsHandlers.Remove(capsName);
        }

        public bool ContainsCap(string cap) 
        {
            return m_capsHandlers.ContainsKey(cap);
        }

        /// <summary>
        /// The indexer allows us to treat the CapsHandlers object
        /// in an intuitive dictionary like way.
        /// </summary>
        /// <Remarks>
        /// The indexer will throw an exception when you try to
        /// retrieve a cap handler for a cap that is not contained in
        /// CapsHandlers.
        /// </Remarks>
        public IRequestHandler this[string idx] 
        {
            get 
            {
                return m_capsHandlers[idx];
            }

            set 
            {
                if (m_capsHandlers.ContainsKey(idx))
                {
                    m_httpListener.RemoveStreamHandler("POST", m_capsHandlers[idx].Path);
                    m_capsHandlers.Remove(idx);
                }

                if (null == value) return;

                m_capsHandlers[idx] = value;
                m_httpListener.AddStreamHandler(value);
            }
        }

        /// <summary>
        /// Return the list of cap names for which this CapsHandlers
        /// object contains cap handlers.
        /// </summary>
        public string[] Caps 
        {
            get 
            {
                string[] __keys = new string[m_capsHandlers.Keys.Count];
                m_capsHandlers.Keys.CopyTo(__keys, 0);
                return __keys;
            }
        }

        /// <summary>
        /// Return an LLSD-serializable Hashtable describing the
        /// capabilities and their handler details.
        /// </summary>
        public Hashtable CapsDetails 
        {
            get
            {
                Hashtable caps = new Hashtable();
                string baseUrl = "http://" + m_httpListenerHostName + ":" + m_httpListenerPort.ToString();
                foreach (string capsName in m_capsHandlers.Keys)
                {
                    // skip SEED cap
                    if ("SEED" == capsName) continue;
                    caps[capsName] = baseUrl + m_capsHandlers[capsName].Path;
                }
                return caps;
            }
        }
    }
}