using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Avalonia.Threading;
using Notify.Ipc;
using Notify.Models;
using Notify.Services;
using Notify.ViewModels;
using Notify.Views;

namespace Notify;

public partial class App : Application
{
    private SettingsWindow? _settingsWindow;
    private SpoolWatcher? _spoolWatcher;

    public static new App Current => (App)Application.Current!;

    public SettingsService Settings { get; } = new();

    public ToastManager Toasts { get; private set; } = null!;

    public override void Initialize() => AvaloniaXamlLoader.Load(this);

    public override void OnFrameworkInitializationCompleted()
    {
        Settings.Load();
        Toasts = new ToastManager(Settings);

        // 监视 spool 目录，把 CLI 投递的请求转成 toast
        _spoolWatcher = new SpoolWatcher(OnNotify);
        _spoolWatcher.Start();

        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            // 无主窗口的常驻进程：仅托盘存在，靠托盘菜单或外部请求驱动
            desktop.ShutdownMode = ShutdownMode.OnExplicitShutdown;

            // --demo：启动即弹一条 toast 并打开设置，便于无托盘交互地验证
            if (desktop.Args is { Length: > 0 } args && System.Array.IndexOf(args, "--demo") >= 0)
            {
                Dispatcher.UIThread.Post(RunDemo);
            }
        }

        base.OnFrameworkInitializationCompleted();
    }

    // 监视线程收到请求，切回 UI 线程弹出 toast
    private void OnNotify(NotifyMessage message)
    {
        if (Settings.Current.PlaySound)
        {
            Notify.Interop.Sound.Play();
        }

        // 目标窗口已是前台（你正盯着看）：完成类通知弹一下即可，用更短的停留
        int? durationOverride = null;
        if (!message.InputMode && message.TargetHwnd != 0 &&
            Notify.Interop.Win32.GetForegroundWindow().ToInt64() == message.TargetHwnd)
        {
            durationOverride = Settings.Current.FocusedDurationSeconds;
        }

        Dispatcher.UIThread.Post(() => Toasts.Show(new ToastRequest
        {
            Title = message.Title,
            Message = message.Message,
            InputMode = message.InputMode,
            Sticky = message.Sticky,
            TargetHwnd = message.TargetHwnd,
            WtRuntimeId = message.WtRuntimeId,
            IconPath = message.IconPath,
            DurationSecondsOverride = durationOverride,
        }));
    }

    private void RunDemo()
    {
        // 普通：会自动消失
        Toasts.Show(new ToastRequest { Title = "Claude Code", Message = "任务已完成 — 4 秒后自动消失" });
        // 常驻：InputMode 且 Sticky，不点不消失
        Toasts.Show(new ToastRequest
        {
            Title = "需要你的输入",
            Message = "权限请求 — 常驻，点击 / ✕ 才关闭",
            InputMode = true,
            Sticky = true,
        });
    }

    // 左键单击托盘图标直接打开设置
    private void OnTrayClicked(object? sender, EventArgs e) => OpenSettings();

    private void OpenSettings()
    {
        if (_settingsWindow is { } w)
        {
            w.Activate();
            return;
        }

        _settingsWindow = new SettingsWindow
        {
            DataContext = new SettingsViewModel(Settings, Toasts),
        };
        _settingsWindow.Closed += (_, _) => _settingsWindow = null;
        _settingsWindow.Show();
    }

    private void OnExitClick(object? sender, EventArgs e)
    {
        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            desktop.Shutdown();
        }
    }
}