using System;
using System.IO;
using System.Windows;
using System.Windows.Threading;

namespace MemScanEDR
{
    public partial class App : Application
    {
        private static readonly string LogPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "crash.log");

        protected override void OnStartup(StartupEventArgs e)
        {
            DispatcherUnhandledException += OnDispatcherUnhandledException;
            AppDomain.CurrentDomain.UnhandledException += OnDomainUnhandledException;

            base.OnStartup(e);

            try
            {
                Directory.CreateDirectory("data");
                Directory.CreateDirectory("logs");
                Directory.CreateDirectory("dumps");
                Directory.CreateDirectory("reports");
            }
            catch (Exception ex)
            {
                LogError("Directory creation failed", ex);
            }
        }

        private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
        {
            LogError("UI Exception", e.Exception);
            MessageBox.Show($"Error logged to crash.log:\n\n{e.Exception.Message}", "MemScan-EDR v2.0",
                MessageBoxButton.OK, MessageBoxImage.Error);
            e.Handled = true;
        }

        private void OnDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            LogError("Fatal Exception", e.ExceptionObject as Exception);
        }

        private static void LogError(string context, Exception? ex)
        {
            try
            {
                var msg = $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] {context}\n{ex}\n\n";
                File.AppendAllText(LogPath, msg);
            }
            catch { }
        }
    }
}