using System.Windows;
using System.Windows.Controls;
using Microsoft.Practices.Prism.Events;
using Microsoft.Practices.ServiceLocation;
using Microsoft.Windows.Controls.Ribbon;

namespace DTS.Common.RibbonControl
{
    public class RibbonControlSelectionChangeBehavior : System.Windows.Interactivity.Behavior<Ribbon>
    {
        public static readonly DependencyProperty TargetRibbonProperty = DependencyProperty.Register("TargetRibbonControl", typeof(Ribbon), typeof(RibbonControlSelectionChangeBehavior), new PropertyMetadata(null));

        private IEventAggregator _eventAggregator;

        public Ribbon TargetRibbonControl
        {
            get => (Ribbon)GetValue(TargetRibbonProperty);
            set => SetValue(TargetRibbonProperty, value);
        }

        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.SelectionChanged += Ribbon_SelectionChanged;

            if (_eventAggregator == null)
                _eventAggregator = ServiceLocator.Current.GetInstance<IEventAggregator>();
        }

        protected override void OnDetaching()
        {
            base.OnDetaching();
            AssociatedObject.SelectionChanged -= Ribbon_SelectionChanged;
        }

        void Ribbon_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (e.AddedItems.Count > 0)
                _eventAggregator.GetEvent<RibbonControlSelectionChanged>().Publish(new RibbonControlSelectionEventArgs(RibbonControlOperation.AddedItem, e.AddedItems[0]));

            if (e.RemovedItems.Count > 0)
                _eventAggregator.GetEvent<RibbonControlSelectionChanged>().Publish(new RibbonControlSelectionEventArgs(RibbonControlOperation.RemovedItem, e.RemovedItems[0]));
        }
    }

}