using System;
using IotWeb.Common.Http;
using System.Threading.Tasks;
using System.Collections.Generic;
using System.Diagnostics;
using Nibriboard.Client.Messages;

namespace Nibriboard.Client
{
	/// <summary>
	/// Manages a group of <see cref="Nibriboard.Client.NibriClient"/>s.
	/// </summary>
	public class NibriClientManager : IWebSocketRequestHandler
	{
		private ClientSettings clientSettings;
		public List<NibriClient> Clients = new List<NibriClient>();

		/// <summary>
		/// The number of clients currently connected to this Nibriboard.
		/// </summary>
		public int ClientCount {
			get {
				return Clients.Count;
			}
		}

		public NibriClientManager(ClientSettings inClientSettings)
		{
			clientSettings = inClientSettings;
		}

		/// <summary>
		/// Whether we will accept a given new WebSocket connection or not.
		/// </summary>
		/// <param name="uri">The uri the user connected to.</param>
		/// <param name="protocol">The protocol the user is connecting with.</param>
		/// <returns>Whether we want to accept the WebSocket connection attempt or not.</returns>
		public bool WillAcceptRequest(string uri, string protocol)
		{
			Log.WriteLine("[Nibriboard/Websocket] Accepting new {0} connection.", protocol);
			return clientSettings.WebsocketProtocol == protocol;
		}
		/// <summary>
		/// Handles WebSocket clients when they first connect, wrapping them in
		/// a <see cref="Nibriboard.NibriClient" /> instance and adding them to
		/// the client list.
		/// </summary>
		/// <param name="newSocket">New socket.</param>
		public void Connected(WebSocket newSocket)
		{
			NibriClient client = new NibriClient(this, newSocket);
			client.Disconnected += handleDisconnection; // Clean up when the client disconnects

			Clients.Add(client);
		}

		/// <summary>
		/// Sends a message to all the connected clients, except the one who's sending it.
		/// </summary>
		/// <param name="sendingClient">The client sending the message.</param>
		/// <param name="message">The message that is to bee sent.</param>
		public void Broadcast(NibriClient sendingClient, Message message)
		{
			foreach(NibriClient client in Clients)
			{
				// Don't send the message to the sender
				if (client == sendingClient)
					continue;
				
				client.Send(message);
			}
		}

		/// <summary>
		/// Clean up after a client disconnects from the server.
		/// </summary>
		/// <param name="disconnectedClient">The client that has disconnected.</param>
		private void handleDisconnection(NibriClient disconnectedClient)
		{
			Clients.Remove(disconnectedClient);
		}
	}
}