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

namespace KnockKnock.Lib
{
	internal class ConnectionPool
	{
		public delegate void PoolEvent(ConnectionPool sender);

		public event PoolEvent Closed;

		List<Connection> connections;

		public ConnectionPool()
		{
			connections = new List<Connection>();
		}

		public void Open()
		{
			foreach (Connection c in this.connections)
			{
				c.Open();
			}
		}

		public void AddConnection(Connection c)
		{
			this.connections.Add(c);
			c.Received += Connection_Receive;
			c.Closed += Connection_Closed;
		}

		public void RemoveConnection(Connection c)
		{
			this.connections.Remove(c);
			c.Received -= Connection_Receive;
			c.Closed -= Connection_Closed;
		}

		public void Close()
		{
			foreach (Connection c in this.connections)
			{
				c.Close();
			}
		}

		protected void Connection_Receive(Connection sender, byte[] data)
		{
			System.Diagnostics.Debug.WriteLine("Receive " + data.Length + " bytes");
			foreach (Connection c in this.connections)
			{
				if (c != sender)
				{
					System.Diagnostics.Debug.WriteLine("Send " + data.Length + " bytes");
					c.Send(data);
				}
			}
		}

		protected void Connection_Closed(Connection sender)
		{
			System.Diagnostics.Debug.WriteLine("Closed");
			foreach (Connection c in this.connections)
			{
				if (c != sender)
				{
					c.Close();
				}
			}
			Closed(this);
		}
	}
}