namespace NeumUI.Assists;

/// <summary>
/// TabAssist 类用于在 WPF 应用程序中为 TabControl 提供附加功能。通过依赖属性 UseFadeIn，可以控制选项卡切换时是否启用渐变浮现效果。
/// 该类扩展了 DependencyObject，因此能够支持数据绑定和样式设置。
/// </summary>
public class TabAssist
{
    /// <summary>
    /// 获取指定依赖对象是否启用渐变浮现效果。
    /// </summary>
    /// <param name="obj">要获取渐变浮现效果设置的依赖对象。</param>
    /// <returns>如果依赖对象启用了渐变浮现效果，则返回 true；否则返回 false。</returns>
    public static bool GetUseFadeIn(DependencyObject obj)
    {
        return (bool)obj.GetValue(UseFadeInProperty);
    }

    /// <summary>
    /// 设置指定依赖对象是否启用渐变浮现效果。
    /// </summary>
    /// <param name="obj">要设置 UseFadeIn 属性的 DependencyObject。</param>
    /// <param name="value">如果为 true，则启用渐变浮现效果；否则，禁用该效果。</param>
    public static void SetUseFadeIn(DependencyObject obj, bool value)
    {
        obj.SetValue(UseFadeInProperty, value);
    }

    /// <summary>
    /// UseFadeInProperty 是一个依赖属性，用于控制 TabControl 在选项卡切换时是否启用渐变浮现效果。通过设置此属性为 true 或 false，可以开启或关闭该视觉效果。
    /// </summary>
    public static readonly DependencyProperty UseFadeInProperty =
        DependencyProperty.RegisterAttached("UseFadeIn",
            typeof(bool), typeof(TabAssist),
            new PropertyMetadata(false, OnUseFadeInChanged));

    //切换选项卡时使用渐变浮现效果
    private static void OnUseFadeInChanged(DependencyObject d,
        DependencyPropertyChangedEventArgs e)
    {
        var tabControl = (TabControl)d;
        if (!(bool)e.OldValue && (bool)e.NewValue)
        {
            tabControl.SelectionChanged += TabControl_FadeInEffect;
        }
        if ((bool)e.OldValue && !(bool)e.NewValue)
        {
            tabControl.SelectionChanged -= TabControl_FadeInEffect;
        }
    }

    private static void TabControl_FadeInEffect(object sender, SelectionChangedEventArgs e)
    {
        var tabControl = (TabControl)sender;
        //判断是子控件消息还是Tab消息
        if (e.Source.GetType() == typeof(TabControl)) return;
        e.Handled = true;
        //继续向父级传递
        if (tabControl.Parent is not UIElement tabParent) return;
        var selectionEventArg =
            new SelectionChangedEventArgs(e.RoutedEvent, e.RemovedItems, e.AddedItems)
            {
                Source = e.OriginalSource
            };
        tabParent.RaiseEvent(selectionEventArg);

    }

    // 注册 TabType 附加属性
    public static readonly DependencyProperty TabTypeProperty =
        DependencyProperty.RegisterAttached(
            "TabType",
            typeof(TabType),
            typeof(TabAssist),
            new PropertyMetadata(TabType.Line)); // 默认值为 Line

    public static void SetTabType(DependencyObject element, TabType value)
    {
        element.SetValue(TabTypeProperty, value);
    }

    public static TabType GetTabType(DependencyObject element)
    {
        return (TabType)element.GetValue(TabTypeProperty);
    }

    // 注册 IsEditable 附加属性
    public static readonly DependencyProperty IsEditableProperty =
        DependencyProperty.RegisterAttached(
            "IsEditable",
            typeof(bool),
            typeof(TabAssist),
            new PropertyMetadata(false));

    public static void SetIsEditable(DependencyObject element, bool value)
    {
        element.SetValue(IsEditableProperty, value);
    }

    public static bool GetIsEditable(DependencyObject element)
    {
        return (bool)element.GetValue(IsEditableProperty);
    }
}
public enum TabType
{
    Line, // 默认线条样式
    Card  // 卡片样式
}