using System;

namespace DTS.Common.Interactivity
{
    public class InteractionRequest<T> : IInteractionRequest
       where T : INotification
    {
        /// <summary>
        /// Fired when interaction is needed.
        /// </summary>
        public event EventHandler<InteractionRequestedEventArgs> Raised;

        /// <summary>
        /// Fires the Raised event.
        /// </summary>
        /// <param name="context">The context for the interaction request.</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate")]
        public void Raise(T context)
        {
            Raise(context, c => { });
        }

        /// <summary>
        /// Fires the Raised event.
        /// </summary>
        /// <param name="context">The context for the interaction request.</param>
        /// <param name="callback">The callback to execute when the interaction is completed.</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate")]
        public void Raise(T context, Action<T> callback)
        {
            var handler = Raised;
            if (handler != null)
            {
                handler(this, new InteractionRequestedEventArgs(context, () => { if (callback != null) callback(context); }));
            }
        }
    }
}