using System;
using Avalonia;
using Avalonia.Animation;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Media;
using Avalonia.Styling;
using Avalonia.Threading;
using Notify.Models;
using Notify.ViewModels;

namespace Notify.Views;

public partial class ToastWindow : Window
{
    private static readonly Color BorderNormal = Color.Parse("#FF4B64B2");
    private static readonly Color BorderInput = Color.Parse("#FF00CFCF");

    private readonly ToastSettings _settings;
    private readonly DispatcherTimer _dismissTimer;
    private readonly bool _sticky;
    private readonly long _targetHwnd;
    private readonly string? _wtRuntimeId;
    private Avalonia.Media.Imaging.Bitmap? _appIcon;
    private bool _closing;

    // 设计器需要的无参构造
    public ToastWindow() : this(new ToastViewModel(new ToastRequest { Title = "Title", Message = "Message" }), new ToastSettings(), false, 0, null, null, null)
    {
    }

    public ToastWindow(ToastViewModel vm, ToastSettings settings, bool sticky, long targetHwnd, string? wtRuntimeId, string? iconPath, int? durationOverride)
    {
        _settings = settings;
        _targetHwnd = targetHwnd;
        _wtRuntimeId = wtRuntimeId;
        var duration = durationOverride ?? settings.DurationSeconds;
        // 常驻：请求显式 Sticky，或停留时长 <= 0
        _sticky = sticky || duration <= 0;
        InitializeComponent();
        DataContext = vm;

        Width = settings.Width;
        Opacity = 0;

        // Opacity 过渡用于淡入/淡出
        Transitions =
        [
            new DoubleTransition
            {
                Property = OpacityProperty,
                Duration = TimeSpan.FromMilliseconds(settings.FadeMilliseconds),
                Easing = new Avalonia.Animation.Easings.CubicEaseOut(),
            },
        ];

        Root.BorderBrush = new SolidColorBrush(vm.InputMode ? BorderInput : BorderNormal);

        // 调用方 App 图标，取不到则保留默认 Claude 图标
        if (!string.IsNullOrEmpty(iconPath))
        {
            _appIcon = Notify.Interop.AppIcon.Extract(iconPath);
            if (_appIcon is not null)
            {
                IconImage.Source = _appIcon;
            }
        }

        _dismissTimer = new DispatcherTimer
        {
            Interval = TimeSpan.FromSeconds(Math.Max(1, duration)),
        };
        _dismissTimer.Tick += (_, _) => BeginClose();
    }

    protected override void OnClosed(EventArgs e)
    {
        base.OnClosed(e);
        _appIcon?.Dispose();
        _appIcon = null;
    }

    protected override void OnOpened(EventArgs e)
    {
        base.OnOpened(e);
        Opacity = _settings.Opacity;   // 触发淡入

        if (TryGetPlatformHandle()?.Handle is { } hwnd)
        {
            // 工具窗口：从任务栏与 Alt+Tab 中隐藏
            Notify.Interop.Win32.MakeToolWindow(hwnd);

            // 跨虚拟桌面：把窗口钉到所有桌面（失败自动忽略）
            if (_settings.ShowOnAllDesktops)
            {
                TryPinWithRetry(hwnd);
            }
        }

        if (!_sticky)
        {
            _dismissTimer.Start();
        }
    }

    /// <summary>
    /// 窗口刚打开时 shell 可能还没给它登记 ApplicationView（GetViewForHwnd 报
    /// TYPE_E_ELEMENTNOTFOUND），故短间隔重试若干次直到成功
    /// </summary>
    private void TryPinWithRetry(IntPtr hwnd)
    {
        if (Notify.Interop.VirtualDesktopPinner.TryPin(hwnd))
        {
            return;
        }

        var attempts = 0;
        var timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(60) };
        timer.Tick += (_, _) =>
        {
            attempts++;
            if (_closing || Notify.Interop.VirtualDesktopPinner.TryPin(hwnd) || attempts >= 15)
            {
                timer.Stop();
            }
        };
        timer.Start();
    }

    private void OnPointerEntered(object? sender, PointerEventArgs e)
    {
        // 悬停时暂停自动消失
        _dismissTimer.Stop();
        if (!_closing)
        {
            Opacity = _settings.Opacity;
        }
    }

    private void OnPointerExited(object? sender, PointerEventArgs e)
    {
        if (!_closing && !_sticky)
        {
            _dismissTimer.Start();
        }
    }

    private void OnBodyPressed(object? sender, PointerPressedEventArgs e)
    {
        // 左键点击主体：激活原窗口后关闭
        if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
        {
            if (_targetHwnd != 0)
            {
                var target = new IntPtr(_targetHwnd);
                Notify.Interop.WindowActivator.Activate(target);

                // 目标是 Windows Terminal 则切回原标签
                if (!string.IsNullOrEmpty(_wtRuntimeId))
                {
                    Notify.Interop.WinTerminalTabs.SelectTab(target, _wtRuntimeId);
                }
            }

            BeginClose();
        }
    }

    private void OnCloseClick(object? sender, RoutedEventArgs e) => BeginClose();

    /// <summary>
    /// 淡出后再真正关闭
    /// </summary>
    private void BeginClose()
    {
        if (_closing)
        {
            return;
        }

        _closing = true;
        _dismissTimer.Stop();
        Opacity = 0;

        var closeTimer = new DispatcherTimer
        {
            Interval = TimeSpan.FromMilliseconds(_settings.FadeMilliseconds),
        };
        closeTimer.Tick += (_, _) =>
        {
            closeTimer.Stop();
            Close();
        };
        closeTimer.Start();
    }
}