/*
 * 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;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections;
using System.IO;
using System.Reflection;
using System.Text;
using log4net;
using Nini.Config;
using Nwc.XmlRpc;
using OpenSim.Framework.Servers;
using OpenSim.Framework;

namespace OpenSim.Framework.Communications
{
    public class GridInfoService
    {
        private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private Hashtable _info = new Hashtable();

        /// <summary>
        /// Instantiate a GridInfoService object.
        /// </summary>
        /// <param name="configPath">path to config path containing
        /// grid information</param>
        /// <remarks>
        /// GridInfoService uses the [GridInfo] section of the
        /// standard OpenSim.ini file --- which is not optimal, but
        /// anything else requires a general redesign of the config
        /// system. 
        /// </remarks>
        public GridInfoService(string configPath)
        {
            _info["platform"] = "OpenSim";
            if (File.Exists(configPath))
            {
                try
                {
                    IConfigSource _configSource = new IniConfigSource(configPath);
                    IConfig startupCfg = _configSource.Configs["Startup"];
                    IConfig gridCfg = _configSource.Configs["GridInfo"];
                    IConfig netCfg = _configSource.Configs["Network"];

                    bool grid = startupCfg.GetBoolean("gridmode", false);

                    if (grid)
                        _info["mode"] = "grid";
                    else 
                        _info["mode"] = "standalone";


                    if (null != gridCfg)
                    {
                        foreach (string k in gridCfg.GetKeys())
                        {
                            _info[k] = gridCfg.GetString(k);
                        }
                    }
                    else if (null != netCfg)
                    {
                        if (grid)
                            _info["login"] = netCfg.GetString("user_server_url");
                        else
                            _info["login"] = String.Format("http://127.0.0.1:{0}/", netCfg.GetString("http_listener_port"));
                        IssueWarning();
                    }
                    else
                    {
                        _info["login"] = "http://127.0.0.1:9000/";
                        IssueWarning();
                    }
                }
                catch (Exception)
                {
                    _log.DebugFormat("[GridInfoService] cannot get grid info from {0}, using minimal defaults", configPath);
                }
            }
            _log.InfoFormat("[GridInfoService] Grid info service initialized with {0} keys", _info.Count);
        }

        /// <summary>
        /// Default constructor, uses OpenSim.ini.
        /// </summary>
        public GridInfoService() : this(Path.Combine(Util.configDir(), "OpenSim.ini"))
        {
        }

        private void IssueWarning()
        {
            _log.Warn("[GridInfoService] found no [GridInfo] section in your OpenSim.ini");
            _log.Warn("[GridInfoService] trying to guess sensible defaults, you might want to provide better ones:");
            foreach (string k in _info.Keys)
            {
                _log.WarnFormat("[GridInfoService] {0}: {1}", k, _info[k]);
            }
        }

        public XmlRpcResponse XmlRpcGridInfoMethod(XmlRpcRequest request)
        {
            XmlRpcResponse response = new XmlRpcResponse();
            Hashtable responseData = new Hashtable();

            _log.Info("[GridInfo]: Request for grid info");

            foreach (string k in _info.Keys)
            {
                responseData[k] = _info[k];
            }
            response.Value = responseData;

            return response;
        }

        public string RestGetGridInfoMethod(string request, string path, string param,
                                            OSHttpRequest httpRequest, OSHttpResponse httpResponse)
        {
            StringBuilder sb = new StringBuilder();

            sb.Append("<gridinfo>\n");
            foreach (string k in _info.Keys)
            {
                sb.AppendFormat("<{0}>{1}</{0}>\n", k, _info[k]);
            }
            sb.Append("</gridinfo>\n");

            return sb.ToString();
        }
    }
}