//

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]

    [KnownType("DerivedTypes")]

    public class Manager

    {

        /// <summary>

        /// Our events instances.

        /// </summary>

        [DataMember]

        public List<Event> Events;

        /// <summary>

        /// Constructor

        /// </summary>

        public Manager()

        {

            Init();

        }

        /// <summary>

        /// Executes after internalization took place.

        /// </summary>

        public void Init()

        {

            if (Events == null)

            {

                Events = new List<Event>();

            }

        }

        /// <summary>

        /// Trigger the given event.

        /// </summary>

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

        public void TriggerEvent<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))

            {

                e.Trigger();

            }

        }

        /// <summary>

        /// Trigger the given event.

        /// </summary>

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

        public void TriggerEvent<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))

            {

                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 (e.Actions.Remove(aAction))

                {

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

                    return;

                }

            }

        }

        /// <summary>

        /// Allow extending our data contract.

        /// See KnownType above.

        /// </summary>

        /// <returns></returns>

        private static IEnumerable<Type> DerivedTypes()

        {

            return SharpLib.Utils.Reflection.GetDerivedTypes<Manager>();

        }

    }

}