using MAX.Framework.Logger;
using NLog;
using Prism.Autofac;
using Prism.Ioc;
using Prism.Services.Dialogs;
using Store.Management.Framework.Configs;
using Store.Management.Framework.Extensions;
using Store.Management.Framework.Services;
using System.Threading;
using System.Windows;
using System.Windows.Threading;

namespace Store.Management.Framework;

public abstract class FrameworkApplication : PrismApplication
{
    private Mutex? _mutex;
    private bool _ownsMutex;
    private int _fatalHandling;
    private int _shutdownRequested;
    public static bool ShuttingDown { get; private set; }
    public static bool IsAppInitialized { get; private set; }
    public static event Action<Exception>? FatalErrorRaised;

    protected FrameworkApplication()
    {
        DispatcherUnhandledException += OnDispatcherUnhandledException;
        AppDomain.CurrentDomain.UnhandledException += OnDomainUnhandledException;
        TaskScheduler.UnobservedTaskException += OnUnobservedTaskException;
    }

    /// <summary>返回 null 可允许多开；默认限制同一登录会话中的应用实例。</summary>
    public virtual string? GetMutexName() => @"Local\Store.Management";

    protected override void OnStartup(StartupEventArgs e)
    {
        try
        {
            //string? name = GetMutexName();
            //if (!string.IsNullOrWhiteSpace(name))
            //{
            //    _mutex = new Mutex(true, name, out _ownsMutex);
            //    if (!_ownsMutex)
            //    {
            //        MessageBox.Show("程序已在运行。", Config.AppName, MessageBoxButton.OK, MessageBoxImage.Information);
            //        Shutdown();
            //        return;
            //    }
            //}
            FolderConfig.Initialize();
            base.OnStartup(e);
            ApplicationLogService.Initialize();
            NLogger.Instance.Info($"软件启动：{Config.AppFullName}，版本：{Config.GetFullVersionString()}，会话：{Config.SessionID}，启动时间：{Config.AppStartTime:O}，Windows：{Config.WindowsVersion}");
            DISource.Resolver = Resolve;
        }
        catch (Exception ex) { Fatal(ex); }
    }

    protected override void OnInitialized()
    {
        base.OnInitialized();
        IsAppInitialized = true;
        NLogger.Instance.Info("软件初始化成功，进入主页面");
    }

    protected override void RegisterRequiredTypes(IContainerRegistry registry)
    {
        base.RegisterRequiredTypes(registry);
        registry.RegisterDialogWindow<Controls.DialogWindow>();
    }

    private object Resolve(Type type, string name)
    {
        if (type == null || Container is null) return null!;
        return name != null ? Container.Resolve(type, name) : Container.Resolve(type);
    }

    private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
    {
        e.Handled = true;
        Fatal(e.Exception);
    }

    private void OnDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
    {
        Exception exception = e.ExceptionObject as Exception ?? new Exception(e.ExceptionObject?.ToString());
        // CLR 终止期间同步记录，不等待 UI 线程。
        if (e.IsTerminating) ApplicationLogService.WriteFatal(exception, "AppDomain.UnhandledException");
        else Fatal(exception);
    }

    private void OnUnobservedTaskException(object? sender, UnobservedTaskExceptionEventArgs e)
    {
        ApplicationLogService.WriteFatal(e.Exception, "TaskScheduler.UnobservedTaskException");
        e.SetObserved();
    }

    /// <summary>先同步保存报告，再通知订阅者并关闭应用。</summary>
    public static void Fatal(Exception exception)
    {
        ArgumentNullException.ThrowIfNull(exception);
        string? path = ApplicationLogService.WriteFatal(exception, "Fatal");
        if (Current is not FrameworkApplication app || Interlocked.Exchange(ref app._fatalHandling, 1) != 0) return;
        foreach (Action<Exception> handler in FatalErrorRaised?.GetInvocationList() ?? [])
        {
            try { handler(exception); }
            catch (Exception ex) { ApplicationLogService.WriteFatal(ex, "FatalErrorRaised"); }
        }
        void ShowErrorAndShutdown()
        {
            try
            {
                MessageBox.Show($"软件发生致命错误，即将关闭。\n{exception.Message}\n\n日志：{path ?? "写入失败，请查看调试输出"}",
                    Config.AppName, MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally { TotalShutdown(-1); }
        }
        if (app.Dispatcher.CheckAccess()) ShowErrorAndShutdown();
        else if (!app.Dispatcher.HasShutdownStarted) app.Dispatcher.BeginInvoke((Action)ShowErrorAndShutdown);
    }

    /// <summary>通过 WPF 正常退出，执行退出清理。</summary>
    public static void TotalShutdown(int exitCode = 0)
    {
        if (Current is not FrameworkApplication app || Interlocked.Exchange(ref app._shutdownRequested, 1) != 0) return;
        ShuttingDown = true;
        if (app.Dispatcher.CheckAccess()) app.Shutdown(exitCode);
        else if (!app.Dispatcher.HasShutdownStarted) app.Dispatcher.BeginInvoke((Action)(() => app.Shutdown(exitCode)));
    }

    protected override void OnExit(ExitEventArgs e)
    {
        ShuttingDown = true;
        try { base.OnExit(e); }
        finally
        {
            DispatcherUnhandledException -= OnDispatcherUnhandledException;
            AppDomain.CurrentDomain.UnhandledException -= OnDomainUnhandledException;
            TaskScheduler.UnobservedTaskException -= OnUnobservedTaskException;
            DISource.Resolver = null!;
            try { if (_ownsMutex) _mutex?.ReleaseMutex(); }
            finally
            {
                _mutex?.Dispose();
                try { NLogger.Instance.Info($"软件关闭，退出码：{e.ApplicationExitCode}"); }
                finally { LogManager.Shutdown(); }
            }
        }
    }
}