using System.Collections.Generic;
using System.Windows;
using TriggerBase = Microsoft.Xaml.Behaviors.TriggerBase;
using Microsoft.Xaml.Behaviors;

namespace DTS.Common.Behaviors
{
    public class InteractivityTemplate : DataTemplate
    {

    }
    /// <summary>
    /// Holder for interactivity entries
    /// </summary>
    public class InteractivityItems : FrameworkElement
    {
        private List<Behavior> _behaviors;
        private List<TriggerBase> _triggers;

        /// <summary>
        /// Storage for triggers
        /// </summary>
        public new List<TriggerBase> Triggers => _triggers ?? (_triggers = new List<TriggerBase>());

        /// <summary>
        /// Storage for Behaviors
        /// </summary>
        public List<Behavior> Behaviors => _behaviors ?? (_behaviors = new List<Behavior>());

        #region Template attached property

        public static InteractivityTemplate GetTemplate(DependencyObject obj)
        {
            return (InteractivityTemplate)obj.GetValue(TemplateProperty);
        }

        public static void SetTemplate(DependencyObject obj, InteractivityTemplate value)
        {
            obj.SetValue(TemplateProperty, value);
        }

        public static readonly DependencyProperty TemplateProperty = DependencyProperty.RegisterAttached("Template", typeof(InteractivityTemplate), typeof(InteractivityItems), new PropertyMetadata(default(InteractivityTemplate), OnTemplateChanged));

        private static void OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (e.NewValue == null) return;
            var interactivityTemplate = (InteractivityTemplate)e.NewValue;
            var interactivityItems = (InteractivityItems)interactivityTemplate.LoadContent();
            var bc = Interaction.GetBehaviors(d);
            var tc = Interaction.GetTriggers(d);

            foreach (var behavior in interactivityItems.Behaviors)
                bc.Add(behavior);

            foreach (var trigger in interactivityItems.Triggers)
                tc.Add(trigger);
        }

        #endregion
    }
}