using Microsoft.Xaml.Behaviors;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace UIShare.Behaviors
{
    public class TabControlSelectionChangedBehavior : Behavior<TabControl>
    {
        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.Register(
                "Command", typeof(ICommand), typeof(TabControlSelectionChangedBehavior), new PropertyMetadata(null));

        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register(
                "CommandParameter", typeof(object), typeof(TabControlSelectionChangedBehavior), new PropertyMetadata(null));

        public ICommand Command
        {
            get { return (ICommand)GetValue(CommandProperty); }
            set { SetValue(CommandProperty, value); }
        }

        public object CommandParameter
        {
            get { return GetValue(CommandParameterProperty); }
            set { SetValue(CommandParameterProperty, value); }
        }

        protected override void OnAttached()
        {
            base.OnAttached();
            if (AssociatedObject != null)
            {
                AssociatedObject.SelectionChanged += OnSelectionChanged;
            }
        }

        protected override void OnDetaching()
        {
            if (AssociatedObject != null)
            {
                AssociatedObject.SelectionChanged -= OnSelectionChanged;
            }
            base.OnDetaching();
        }

        private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var tabItem = AssociatedObject.SelectedItem as TabItem;
            // 获取选中 TabItem 的 Header
            if (Command != null && Command.CanExecute(tabItem.Header))
            {
                // 使用选中 TabItem 的 Header 作为 CommandParameter
                Command.Execute(((TabItem)AssociatedObject.SelectedItem)?.Header);
            }
        }
    }
}