/*
 * 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 OpenSimulator 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.IO;
using System.Net;
using System.Reflection;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

using log4net;

namespace OpenSim.Framework.Servers.HttpServer
{
    public class SynchronousRestFormsRequester
    {
        private static readonly ILog m_log =
                LogManager.GetLogger(
                MethodBase.GetCurrentMethod().DeclaringType);
        
        /// <summary>
        /// Perform a synchronous REST request.
        /// </summary>
        /// <param name="verb"></param>
        /// <param name="requestUrl"></param>
        /// <param name="obj"> </param>
        /// <returns></returns>
        ///
        /// <exception cref="System.Net.WebException">Thrown if we encounter a network issue while posting
        /// the request.  You'll want to make sure you deal with this as they're not uncommon</exception>
        public static string MakeRequest(string verb, string requestUrl, string obj)
        {
            WebRequest request = WebRequest.Create(requestUrl);
            request.Method = verb;

            if ((verb == "POST") || (verb == "PUT"))
            {
                request.ContentType = "text/www-form-urlencoded";

                MemoryStream buffer = new MemoryStream();
                int length = 0;
                using (StreamWriter writer = new StreamWriter(buffer))
                {
                    writer.Write(obj);
                    writer.Flush();
                }

                length = (int)obj.Length;
                request.ContentLength = length;

                Stream requestStream = null;
                try
                {
                    requestStream = request.GetRequestStream();
                    requestStream.Write(buffer.ToArray(), 0, length);
                }
                catch (Exception e)
                {
                    m_log.DebugFormat("[FORMS]: exception occured on sending request to {0}: " + e.ToString(), requestUrl);
                }
                finally
                {
                    // If this is closed, it will be disposed internally,
                    // but the above write is asynchronous and may hit after
                    // we're through here. So the thread handling that will
                    // throw and put us back into the catch above. Isn't 
                    // .NET great?
                    //if (requestStream != null)
                    //    requestStream.Close();
                    // Let's not close this
                    //buffer.Close();

                }
            }

            string respstring = String.Empty;

            try
            {
                using (WebResponse resp = request.GetResponse())
                {
                    if (resp.ContentLength != 0)
                    {
                        Stream respStream = null;
                        try
                        {
                            respStream = resp.GetResponseStream();
                            using (StreamReader reader = new StreamReader(respStream))
                            {
                                respstring = reader.ReadToEnd();
                            }
                        }
                        catch (Exception e)
                        {
                            m_log.DebugFormat("[FORMS]: exception occured on receiving reply " + e.ToString());
                        }
                        finally
                        {
                            if (respStream != null)
                                respStream.Close();
                        }
                    }
                }
            }
            catch (System.InvalidOperationException)
            {
                // This is what happens when there is invalid XML
                m_log.DebugFormat("[FORMS]: InvalidOperationException on receiving request");
            }
            return respstring;
        }
    }
}