using Microsoft.Xaml.Behaviors;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;

namespace AIK.Behaviors
{
    public class ClickBehavior : Behavior<FrameworkElement>
    {
        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.Register(nameof(Command), typeof(ICommand), typeof(ClickBehavior));

        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register(nameof(CommandParameter), typeof(object), typeof(ClickBehavior));

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

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

        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.MouseLeftButtonDown += OnMouseLeftButtonDown;
            AssociatedObject.Loaded += OnLoaded;
        }

        protected override void OnDetaching()
        {
            base.OnDetaching();
            AssociatedObject.MouseLeftButtonDown -= OnMouseLeftButtonDown;
            AssociatedObject.Loaded -= OnLoaded;
        }

        private void OnLoaded(object sender, RoutedEventArgs e)
        {
            // 调试信息
            //System.Diagnostics.Debug.WriteLine($"ClickBehavior loaded on {AssociatedObject.GetType().Name}");
            //System.Diagnostics.Debug.WriteLine($"Command: {Command}");
            //System.Diagnostics.Debug.WriteLine($"CommandParameter: {CommandParameter}");
        }

        private void OnMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            if (Command?.CanExecute(CommandParameter) == true)
            {
                Command.Execute(CommandParameter);
                e.Handled = true;
            }
        }
    }
}