using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleAdvancedTopics
{
    // Chapter 8
    // define a delegate type
    public delegate void MessageHandler(string message);

    // class Publish "Publisher"
    public class Publisher
    {
        // Declare an event using a delegate type
        public event MessageHandler MessagePublished;

        public void PublishMessage(string message)
        {
            Console.WriteLine($"Message Published: {message}");
            // Raise the Event
            OnMessagePublished(message); // define the method

        } // PublishMessage


        // OnMessagePublished
        // Protected virtual method to raise the event
        protected virtual void OnMessagePublished(string message)
        {
            MessagePublished?.Invoke(message);

        } // OnMessagePublished


    } // Publisher


    // class Subscribe "Subcriber"
    public class Subcriber
    {
        public void HandleMessage(string message)
        {
            Console.WriteLine($"Subscriber says: Message {message} receieved");
        }
    
    } // Subscriber

    // Main Class
    class DelegatesAndEvents
    {
    } // DelegatesAndEvents
}