using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Markup;
using Tango.BL;
using Tango.Core;
using Tango.Core.DI;
using Tango.Core.Helpers;
using Tango.Insights;
using Tango.Integration.Operation;
using Tango.Logging;
using Tango.PPC.Common;
using Tango.PPC.Common.EventLogging;
using Tango.PPC.Common.Helpers;
using Tango.PPC.Common.Notifications;
using Tango.PPC.Common.WatchDog;
using Tango.Settings;

namespace Tango.PPC.UI
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        public static WpfGlobalExceptionTrapper ExceptionTrapper;

        public static String[] StartupArgs { get; private set; }
        private LogManager LogManager = LogManager.Default;

        /// <summary>
        /// Raises the <see cref="E:System.Windows.Application.Startup" /> event.
        /// </summary>
        /// <param name="e">A <see cref="T:System.Windows.StartupEventArgs" /> that contains the event data.</param>
        protected override void OnStartup(StartupEventArgs e)
        {
            //throw new InvalidOperationException("This is a fake exception!!!");

            //removed due to possibly causing this issue:
            //https://stackoverflow.com/questions/41543956/how-to-debug-not-enough-storage-is-available-to-process-this-command
            //ThreadPool.SetMaxThreads(1000, 1000);

            //If no debugger is attached and the argument -debug was passed launch the debugger.
            if (e.Args.Contains("-debug") && !Debugger.IsAttached)
            {
                Debugger.Launch();
            }
            StartupArgs = e.Args;
            //Set culture info.
           /* var enUSCulture = new CultureInfo("en-US")
            { NumberFormat = { NumberDecimalSeparator = "." } };

            Thread.CurrentThread.CurrentCulture = enUSCulture;
            Thread.CurrentThread.CurrentUICulture = enUSCulture;
            CultureInfo.DefaultThreadCurrentCulture = enUSCulture;
            CultureInfo.DefaultThreadCurrentUICulture = enUSCulture;

            FrameworkElement.LanguageProperty.OverrideMetadata(
            typeof(FrameworkElement),
            new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag)));*/

         
            //LogManager.RegisterLogger(new ConsoleLogger("Tango PPC Debug"));
            LogManager.RegisterLogger(new FileLogger()
            {
                EnableAutoLogRemoval = true,
                EnableMaxFileSizeLimit = true,
                AutoLogRemovalPeriod = TimeSpan.FromDays(30)
            });

#if DEBUG
            LogManager.RegisterLogger(new VSOutputLogger());
#endif

            //Configure machine operator logger.
            var operatorLogger = MachineOperator.EmbeddedLogManager.RegisteredLoggers.SingleOrDefault(x => x is FileLogger) as FileLogger;
            if (operatorLogger != null)
            {
                operatorLogger.EnableAutoLogRemoval = true;
                operatorLogger.EnableMaxFileSizeLimit = true;
                operatorLogger.AutoLogRemovalPeriod = TimeSpan.FromDays(30);
            }

            LogsHelper.SetLogSafe(LogManager.CreateLogSafe());
            LogManager.Log($"Application Started... Version: '{AssemblyHelper.GetCurrentAssemblyVersion()}'.");

            base.OnStartup(e);

            ExceptionTrapper = new WpfGlobalExceptionTrapper();
            ExceptionTrapper.Initialize(this);
            ExceptionTrapper.ApplicationCrashed += ExceptionTrapper_ApplicationCrashed;

            CoreSettings.DefaultDataSource = new DataSource()
            {
                Address = "localhost\\SQLEXPRESS",
                Catalog = "Tango",
                IntegratedSecurity = true,
            };

            WebRequest.DefaultWebProxy = null;

            GetLastApplicationCrashFromWindows();
        }

        #region Global Exception Trapping

        private async void GetLastApplicationCrashFromWindows()
        {
            var logItem = await ExceptionTrapper.GetLastApplicationCrashEventLog(60);
            if (logItem != null)
            {
                LogManager.Log(logItem);

                try
                {
                    InsightsManager.Default.InsertApplicationException(new InsightsApplicationException()
                    {
                        Time = DateTime.UtcNow,
                        Exception = logItem.Message,
                        IsApplicationCrash = true
                    });
                }
                catch { }
            }
        }

        /// <summary>
        /// Handles the ApplicationCrashed event of the ExceptionTrapper.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="ApplicationCrashedEventArgs"/> instance containing the event data.</param>
        private void ExceptionTrapper_ApplicationCrashed(object sender, ApplicationCrashedEventArgs e)
        {
            List<String> ignoredExceptions = new List<string>()
            {
                "FocusVisualStyle",
                "ThreadAbortException",
                "A Task's exception(s) were not observed"
            };

            String exceptionString = e.Exception.ToStringSafe();

            if (ignoredExceptions.Exists(x => exceptionString.Contains(x)))
            {
                return;
            }

            try
            {
                LogManager.Log(e.Exception, "Application Crashed!");
                LogManager.Log("Trying to recover from application crash...");

                try
                {
                    InsightsManager.Default.InsertApplicationException(new InsightsApplicationException()
                    {
                        Time = DateTime.UtcNow,
                        Exception = e.Exception.ToString()
                    });
                }
                catch
                { }

                try
                {
                    if (Application.Current == null)
                    {
                        new Application { ShutdownMode = ShutdownMode.OnExplicitShutdown };
                    }
                }
                catch { }

                try
                {
                    var eventLogger = TangoIOC.Default.GetInstance<IEventLogger>();
                    if (eventLogger != null)
                    {
                        eventLogger.Log(e.Exception, "Application Crashed!");
                    }
                }
                catch { }

                Application.Current.Dispatcher.Invoke(async () =>
                {
                    try
                    {
                        LogManager.Log("Trying to notify the user about the crash...");
                        INotificationProvider notificationProvider = TangoIOC.Default.GetInstance<INotificationProvider>();

                        if (notificationProvider != null)
                        {
                            await notificationProvider.ShowError("An unexpected error has occurred. Use the application logs to diagnose and report the problem.");
                        }
                    }
                    catch (Exception ex)
                    {
                        LogManager.Log(ex, "Error using the notification provider.");
                    }
                });
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error in global exception trapper!");
            }
        }

        #endregion
    }
}