#region
/* -----------------------------------------------------------------------
 * <copyright file="App.xaml.cs" company="GRNet">
 * 
 * Copyright 2011-2012 GRNET S.A. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *   1. Redistributions of source code must retain the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer.
 *
 *   2. 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.
 *
 *
 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A OR
 * 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.
 *
 * The views and conclusions contained in the software and
 * documentation are those of the authors and should not be
 * interpreted as representing official policies, either expressed
 * or implied, of GRNET S.A.
 * </copyright>
 * -----------------------------------------------------------------------
 */
#endregion
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using Caliburn.Micro;
using Pithos.Client.WPF.Configuration;
using Pithos.Client.WPF.Properties;
using log4net.Appender;
using log4net.Core;
using log4net.Repository.Hierarchy;
using System.Runtime.InteropServices;


namespace Pithos.Client.WPF
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private static readonly log4net.ILog Log = log4net.LogManager.GetLogger( MethodBase.GetCurrentMethod().DeclaringType );
        
            ///DLL Import to add restart manager support
            [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
            static extern uint RegisterApplicationRestart(string pwzCommandLine, RestartFlags dwFlags);
		
        public App()
        {

            //var instanceMutex=new Mutex()

            InitializeLogging();

            ///Register Application in the Restartmanager service
            RegisterApplicationRestart("Upgrade", RestartFlags.NONE);


            DispatcherUnhandledException += OnDispatcherUnhandledException;
            AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;
            TaskScheduler.UnobservedTaskException += OnUnobservedException;


            //Fix incorrect proxy settings by switching to default proxy, if the proxy server settings is empty
            if (Settings.Default.UseManualProxy && String.IsNullOrWhiteSpace(Settings.Default.ProxyServer))
            {
                Settings.Default.UseManualProxy = false;
                Settings.Default.UseDefaultProxy = true;
            }

            if (Settings.Default.IgnoreCertificateErrors)
                ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, errors) => true;


            InitializeComponent();            
        }       


/*
        private void OnUpdateDetected(object sender, UpdateDetectedEventArgs e)
        {
            Log.InfoFormat("Update Detected {0}",e.LatestVersion.Version);    
        }
*/

        private static void InitializeLogging()
        {
            log4net.Config.XmlConfigurator.Configure();

            try
            {
                var pithosDataPath = PithosSettings.PithosDataPath;
                if (!Directory.Exists(pithosDataPath))
                    Directory.CreateDirectory(pithosDataPath);

                var loggerRepository = (Hierarchy)log4net.LogManager.GetRepository();

                var appenders = loggerRepository.GetAppenders();
                

                var lossyAppender = appenders.OfType<BufferingForwardingAppender>()
                    .FirstOrDefault(appender => appender.Name == "LossyFileAppender");
                if (lossyAppender!=null)
                {
                    var dumpAppender = lossyAppender.Appenders.OfType<RollingFileAppender>().First();
                    dumpAppender.File = Path.Combine(pithosDataPath, "errorlog.xml");
                    dumpAppender.ActivateOptions();
                }
                
                var debugAppender =appenders.OfType<RollingFileAppender>()
                    .FirstOrDefault(a => a.Name == "DebugFileAppender");
                if (debugAppender != null)
                {
                    debugAppender.File = Path.Combine(pithosDataPath, "debuglog.xml");
                    if (!Settings.Default.DebugLoggingEnabled)
                        debugAppender.Threshold = Level.Off;
                    debugAppender.ActivateOptions();
                }
            }
            catch (Exception exc)
            {
                Log.Error("Dumpl appender initialization failed",exc);                
            }
        }

        private Mutex _singleInstanceMutex;

        protected override void OnStartup(StartupEventArgs e)
        {
            if (!Settings.Default.StartOnSystemStartup && e.Args.Contains("startup"))
            {
                Shutdown();
                return;
            }

            bool firstInstance;
            _singleInstanceMutex = new Mutex(false, "PITHOSMUTEX", out firstInstance);
            if (!firstInstance)
            {
                _singleInstanceMutex.Dispose();
                _singleInstanceMutex = null;
                Shutdown();
                return;
            }

            //Delay during startup
            if (e.Args.Contains("startup"))
            {
                if (Settings.Default.StartupDelay>TimeSpan.Zero)
                    Thread.Sleep(Settings.Default.StartupDelay);
            }

            var splashScreen = new SplashScreen("images/pithos_logo-title-margin-splash-600-whitebg.png");
            splashScreen.Show(true);
            
            base.OnStartup(e);
        }

        protected override void OnExit(ExitEventArgs e)
        {
            try
            {
                if (_singleInstanceMutex!=null)
                    _singleInstanceMutex.Dispose();
                _singleInstanceMutex = null;
            }
            catch { }
            base.OnExit(e);
        }

        private void OnUnobservedException(object sender, UnobservedTaskExceptionEventArgs e)
        {
            Log.Error("Unobserved Task Exception", e.Exception); 
            
            var messages = new List<UserMessage>();
            e.Exception.Handle(exc=>{
                messages.Add(new UserMessage
                {
                    Message = "Unexpected Exception",
                    Details = exc.ToString(),
                    Severity = Severity.Error
                });
                return true;
            });


            var message = String.Format(@"{0}" + Environment.NewLine + "{1}" + Environment.NewLine + "{2}", 
                WPF.Properties.Resources.Unexpected_Error,
                WPF.Properties.Resources.We_Apologize, 
                WPF.Properties.Resources.Please_Submit_Error);
            ShowMessages("Oops!",message, messages);
            e.SetObserved();            
        }

        private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            Log.Error("Unhandled exception", (Exception)e.ExceptionObject);

            var description = e.IsTerminating
                              ? WPF.Properties.Resources.Unexpected_Error_Terminating
                              : WPF.Properties.Resources.Unexpected_Error;
            var message = String.Format(@"{0}<LineBreak/>{1}<LineBreak/><LineBreak/>{2}",
                description,
                WPF.Properties.Resources.We_Apologize,
                WPF.Properties.Resources.Please_Submit_Error);


            var exc = ((Exception) e.ExceptionObject);
            var messages = new[]{
                                   new UserMessage
                                       {
                                           Message = exc.Message,
                                           Details = exc.ToString(),
                                           Severity = Severity.Error
                                       }
                               };


            ShowMessages("Oops!", message,messages);
        }

        void OnDispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
        {
            Log.Error("Unhandled Dispatcher exception", e.Exception);
            
            var messages = new[]{
                                   new UserMessage
                                       {
                                           Message = e.Exception.Message, 
                                           Details = e.Exception.ToString(),
                                           Severity = Severity.Error
                                       }
                               };
            ShowMessages(WPF.Properties.Resources.Error_Title, 
                WPF.Properties.Resources.Unexpected_Error,
                messages);
            e.Handled=true;
        }

        void ShowMessages(string title,string message,IEnumerable<UserMessage> messages )
        {
            var messageList = messages.ToList();
            LogMessages(messageList);
            Execute.OnUIThread(()=>{
                                       var messageView = new MessageView(messageList)
                                                        {
                                                            Title = title, 
                                                            Message = message
                                                        };
                                       messageView.ShowDialog();
            });
        }

        private void LogMessages(IEnumerable<UserMessage> messages)
        {
            var logMessage = CreateMessage(messages);

            Log.Error(logMessage);
        }

        private static string CreateMessage(IEnumerable<UserMessage> messages)
        {
            var messageBuilder = messages.Aggregate(new StringBuilder("Unexpected Error\r\n"),
                                                    (builder, message) =>
                                                        {
                                                            builder.AppendFormat("\r\n[{0}] {1}\r\n{2}\r\n", message.Severity,
                                                                                 message.Message, message.Details);
                                                            return builder;
                                                        });
            var logMessage = messageBuilder.ToString();
            return logMessage;
        }
    }

}

    enum RestartFlags
    {
        NONE = 0,
        RESTART_CYCLICAL = 1,
        RESTART_NOTIFY_SOLUTION = 2,
        RESTART_NOTIFY_FAULT = 4,
        RESTART_NO_CRASH = 8,
        RESTART_NO_HANG = 16,
        RESTART_NO_PATCH = 32,
        RESTART_NO_REBOOT = 64
    }