//

 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Linq;

 using System.Reflection;

 using System.Runtime.Serialization;

 using SharpLib.Utils;

 namespace SharpLib.Ear

 {

     /// <summary>

     /// Event Action Router (Ear) is a generic and extensible framework allowing users to execute actions in response to events. 

     /// Users can implement their own events and actions.

     /// </summary>

     [DataContract]

     public class Manager: Object

     {

         /// <summary>

         /// Our events instances.

         /// </summary>

         [DataMember]

         public List<Event> Events;

         /// <summary>

         /// Executes after internalization took place.

         /// </summary>

         protected override void DoConstruct()

         {

             base.DoConstruct();

             if (Events == null)

             {

                 Events = new List<Event>();

             }

             // TODO: Object properties should be constructed too

             foreach (Event e in Events)

             {

                 e.Construct();

             }

         }

         /// <summary>

         /// Trigger the given event.

         /// </summary>

         /// <param name="aEventType"></param>

         public async void TriggerEvents<T>() where T: class

         {

             //Only trigger enabled events matching the desired type

             foreach (Event e in Events.Where(e => e.GetType() == typeof(T) && e.Enabled))

             {

                 await e.Trigger();

             }

         }

         /// <summary>

         /// Trigger the given event.

         /// </summary>

         /// <param name="aEventType"></param>

         public async void TriggerEvents<T>(T aEvent) where T : class

         {

             //Only trigger events matching the desired type

             foreach (Event e in Events.Where(e => e.Equals(aEvent) && e.Enabled))

             {

                 await e.Trigger();

             }

         }

         /// <summary>

         /// 

         /// </summary>

         /// <typeparam name="T"></typeparam>

         /// <param name="aEvent"></param>

         public async void TriggerEventsByName(string aName)

         {

             if (string.IsNullOrEmpty(aName))

             {

                 //Just don't do that, that would be silly

                 return;

             }

             // Only trigger events matching the desired type

             // Doing some safety checks as well to prevent crashing if name was left null for some reason

             // This was the case when loading existing settings after event Name was introduced

             foreach (Event e in Events.Where(e => !string.IsNullOrEmpty(e.Name) && e.Enabled && aName.Equals(e.Name)))

             {

                 await e.Trigger();

             }

         }

         /// <summary>

         /// Remove the specified action from the event it belongs too.

         /// </summary>

         /// <param name="aAction"></param>

         public void RemoveAction(Action aAction)

         {

             foreach (Event e in Events)

             {

                 if (RemoveObject(e,aAction))

                 {

                     //We removed our action, we are done here.

                     return;

                 }

             }

         }

         /// <summary>

         /// Remove the specified action from the event it belongs too.

         /// </summary>

         /// <param name="aAction"></param>

         private static bool RemoveObject(Object aCurrent, Object aToRemove)

         {

             //Exit condition

             if (aCurrent.Objects.Remove(aToRemove))

             {

                 //We removed our action, we are done here.

                 return true;

             }

             foreach (Object o in aCurrent.Objects)

             {

                 bool done = RemoveObject(o, aToRemove);

                 if (done)

                 {

                     return true;

                 } 

             }

             return false;

         }

     }

 }