using System;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
using System.Windows.Forms;
using System.Windows.Interop;
using PersonalToolBox.Helpers;
using PersonalToolBox.ViewModels;

namespace PersonalToolBox.Views;

public partial class MainWindow : Window
{
    private readonly MainViewModel _viewModel;
    private readonly HotKeyManager _hotKeyManager;
    private NotifyIcon? _notifyIcon;
    private bool _canActuallyClose;

    public MainWindow(MainViewModel viewModel, HotKeyManager hotKeyManager)
    {
        InitializeComponent();

        _viewModel = viewModel;
        _hotKeyManager = hotKeyManager;
        DataContext = viewModel;

        viewModel.Logs.CollectionChanged += OnLogsCollectionChanged;

        CreateTrayIcon();
    }

    /// <summary>
    /// 窗口句柄就绪后注册全局快捷键
    /// </summary>
    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized(e);

        var hwndSource = (HwndSource)PresentationSource.FromVisual(this)!;
        _hotKeyManager.Initialize(hwndSource.Handle);
        hwndSource.AddHook(WndProcHook);
        _viewModel.RegisterAllHotKeys();
    }

    // ──────────────── 系统托盘 ────────────────

    /// <summary>
    /// 创建系统托盘图标及右键菜单
    /// </summary>
    private void CreateTrayIcon()
    {
        _notifyIcon = new NotifyIcon
        {
            Icon = CreateAppIcon(),
            Visible = true,
            Text = "个人工具箱"
        };

        _notifyIcon.MouseClick += (s, e) =>
        {
            if (e.Button == MouseButtons.Left)
                ToggleVisibility();
        };

        var menu = new ContextMenuStrip();
        menu.Items.Add("显示主界面", null, (_, _) => ShowMainWindow());
        menu.Items.Add("设置", null, (_, _) => OpenSettings());
        menu.Items.Add(new ToolStripSeparator());
        menu.Items.Add("彻底退出", null, (_, _) => ExitApplication());
        _notifyIcon.ContextMenuStrip = menu;
    }

    /// <summary>
    /// 程序化生成 32x32 托盘图标
    /// </summary>
    private static System.Drawing.Icon CreateAppIcon()
    {
        var bmp = new System.Drawing.Bitmap(32, 32);
        using var g = System.Drawing.Graphics.FromImage(bmp);
        g.Clear(System.Drawing.Color.FromArgb(30, 30, 46));
        using var font = new System.Drawing.Font(System.Drawing.FontFamily.GenericSansSerif, 16, System.Drawing.FontStyle.Bold);
        using var brush = new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(137, 180, 250));
        g.DrawString("T", font, brush, new System.Drawing.PointF(6, 3));
        return System.Drawing.Icon.FromHandle(bmp.GetHicon());
    }

    /// <summary>
    /// 左键托盘图标：切换窗口显示/隐藏
    /// </summary>
    private void ToggleVisibility()
    {
        if (IsVisible)
            Hide();
        else
            ShowMainWindow();
    }

    /// <summary>
    /// 显示主窗口并置前
    /// </summary>
    private void ShowMainWindow()
    {
        Show();
        WindowState = WindowState.Normal;
        Activate();
    }

    /// <summary>
    /// 打开设置（当前无额外设置界面，提示使用内置功能）
    /// </summary>
    private void OpenSettings()
    {
        ShowMainWindow();
        _viewModel.LogServiceMessage("设置功能可通过左侧栏管理分类和主题切换");
    }

    /// <summary>
    /// 彻底退出程序
    /// </summary>
    public void ExitApplication()
    {
        _canActuallyClose = true;
        _notifyIcon?.Dispose();
        _hotKeyManager.Dispose();
        System.Windows.Application.Current.Shutdown();
    }

    /// <summary>
    /// 点击关闭按钮时隐藏窗口而非退出
    /// </summary>
    protected override void OnClosing(CancelEventArgs e)
    {
        if (!_canActuallyClose)
        {
            e.Cancel = true;
            Hide();
        }
        base.OnClosing(e);
    }

    // ──────────────── 其他 ────────────────

    private IntPtr WndProcHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        handled = _hotKeyManager.TryHandleMessage(msg, wParam, lParam);
        return IntPtr.Zero;
    }

    private void OnLogsCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.Action == NotifyCollectionChangedAction.Add && LogListBox.Items.Count > 0)
        {
            Dispatcher.BeginInvoke(new Action(() =>
            {
                LogListBox.ScrollIntoView(LogListBox.Items[^1]);
            }), System.Windows.Threading.DispatcherPriority.Background);
        }
    }
}

/// <summary>
/// bool → double: true=1.0, false=0.4 (工具卡片失效时置灰)
/// </summary>
public class BoolToOpacityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value is bool b && b ? 1.0 : 0.4;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

/// <summary>
/// string → string: 取字符串首字符作为图标占位
/// </summary>
public class FirstCharConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var s = value as string;
        return string.IsNullOrEmpty(s) ? "?" : s[0].ToString();
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        => throw new NotImplementedException();
}