using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using Tango.BL;
using Tango.Core;
using Tango.Core.DI;
using Tango.Core.Helpers;
using Tango.Logging;
using Tango.PPC.Common;
using Tango.PPC.Common.EventLogging;
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
    {
        private 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)
        {
            //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;

            //LogManager.RegisterLogger(new ConsoleLogger("Tango PPC Debug"));
            LogManager.RegisterLogger(new FileLogger());
            LogManager.RegisterLogger(new VSOutputLogger());

            LogManager.Log("Application Started...");

            base.OnStartup(e);

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

            LogManager.Categories.Clear();

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

            SettingsManager.Default.GetOrCreate<CoreSettings>();

            var settings = SettingsManager.Default.GetOrCreate<PPCSettings>();

            if (settings.LoggingCategories.Count == 0)
            {
                settings.LoggingCategories.Add(LogCategory.Critical);
                settings.LoggingCategories.Add(LogCategory.Error);
                settings.LoggingCategories.Add(LogCategory.Info);
                settings.LoggingCategories.Add(LogCategory.Warning);
            }

            settings.Save();

            LogManager.Categories.AddRange(settings.LoggingCategories);
        }

        #region Global Exception Trapping

        /// <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)
        {
            e.TryRecover = true;

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

                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
    }
}