/* Copyright (c) Citrix Systems, Inc. 
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 * 
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 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
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 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
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 */

using System;
using System.IO.Pipes;
using System.ServiceProcess;
using System.Text;
using XenAdmin.Model;
using XenAPI;

namespace XenAdmin.Actions
{
    public class TransferProxySettingsAction : PureAsyncAction
    {
        private HTTPHelper.ProxyStyle proxyStyle;
        private string proxyAddress;
        private int proxyPort;
        private int timeOut;
        private bool bypassProxyForServers;
        private bool provideProxyCredentials;
        private string proxyUsername;
        private string proxyPassword;
        private HTTP.ProxyAuthenticationMethod proxyAuthenticationMethod;

        public TransferProxySettingsAction(HTTPHelper.ProxyStyle style, string address, int port, int timeout,
            bool suppressHistory, bool bypassForServer, bool provideCredentials, string username, string password, HTTP.ProxyAuthenticationMethod proxyAuthMethod)
            : base(null, Messages.ACTION_TRANSFER_HEALTHCHECK_SETTINGS, Messages.ACTION_TRANSFER_HEALTHCHECK_SETTINGS, suppressHistory)
        {
            proxyStyle = style;
            proxyAddress = address;
            proxyPort = port;
            timeOut = timeout;
            bypassProxyForServers = bypassForServer;
            provideProxyCredentials = provideCredentials;
            proxyUsername = username;
            proxyPassword = password;
            proxyAuthenticationMethod = proxyAuthMethod;
        }

        private const string HEALTHCHECKSERVICENAME = "XenServerHealthCheck";
        private const char SEPARATOR = '\x202f'; // narrow non-breaking space.

        private string getProxySettings()
        {
            string proxySettings;
            switch (proxyStyle)
            {
                case HTTPHelper.ProxyStyle.SpecifiedProxy:
                    proxySettings = String.Join(SEPARATOR.ToString(), new[] {
                            HealthCheckSettings.PROXY_SETTINGS,
                            ((Int32)HTTPHelper.ProxyStyle.SpecifiedProxy).ToString(),
                            proxyAddress,
                            proxyPort.ToString(),
                            timeOut.ToString(),
                            bypassProxyForServers.ToString(),
                            provideProxyCredentials.ToString(),
                            proxyUsername.ToString(),
                            proxyPassword.ToString(),
                            ((Int32)proxyAuthenticationMethod).ToString()});
                    return proxySettings;
                    
                case HTTPHelper.ProxyStyle.SystemProxy:
                    proxySettings = String.Join(SEPARATOR.ToString(), new[] {
                            HealthCheckSettings.PROXY_SETTINGS, ((Int32)HTTPHelper.ProxyStyle.SystemProxy).ToString()});
                    return proxySettings;

                default:
                    proxySettings = String.Join(SEPARATOR.ToString(), new[] {
                            HealthCheckSettings.PROXY_SETTINGS, ((Int32)HTTPHelper.ProxyStyle.DirectConnection).ToString()});
                    return proxySettings;
            }
        }

        protected override void Run()
        {
            try
            {
                ServiceController sc = new ServiceController(HEALTHCHECKSERVICENAME);
                if (sc.Status != ServiceControllerStatus.Running)
                    return;
            }
            catch
            {
                return;
            }

            NamedPipeClientStream pipeClient = new NamedPipeClientStream(".", HealthCheckSettings.HEALTH_CHECK_PIPE, PipeDirection.Out);
            int retryCount = 120;
            do
            {
                try
                {
                    pipeClient.Connect(0);
                }
                catch (System.TimeoutException exp)
                {
                    throw exp;
                }
                catch 
                {
                    System.Threading.Thread.Sleep(1000);
                    pipeClient = null;
                    pipeClient = new NamedPipeClientStream(".", HealthCheckSettings.HEALTH_CHECK_PIPE, PipeDirection.Out);
                }
            } while (!pipeClient.IsConnected && retryCount-- != 0);

            byte[] proxy = Encoding.UTF8.GetBytes(getProxySettings());
            pipeClient.Write(proxy, 0, proxy.Length);

            byte[] endMsg = Encoding.UTF8.GetBytes(HealthCheckSettings.HEALTH_CHECK_PIPE_END_MESSAGE);
            pipeClient.Write(endMsg, 0, endMsg.Length);
            pipeClient.Close();
        }
    }
}