using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;

namespace Passer.RoboidControl {

    /// <summary>
    /// A site server is a participant which provides a shared simulated environment 
    /// </summary>
    public class SiteServer : Participant {

        /// <summary>
        /// Create a new site server
        /// </summary>
        /// <param name="port"></param>
        public SiteServer(int port = 7681) {
            this.name = "Site Server";

            this.ipAddress = "0.0.0.0";
            this.port = port;

            //this.endPoint = new IPEndPoint(IPAddress.Parse(ipAddress), port); // for sending

            Console.Write($"Prepare receive on port {port}");
            this.udpClient = new UdpClient(port); // for receiving
            this.udpClient.BeginReceive(
                new AsyncCallback(result => ReceiveUDP(result)),
                new Tuple<UdpClient, IPEndPoint>(this.udpClient, new IPEndPoint(IPAddress.Any, port)));
        }

        /// <summary>
        ///  Close the site
        /// </summary>
        public void Close() {
            this.udpClient?.Close();
        }

        public override void Publish() {
        }

        protected override void Process(RemoteParticipant sender, ParticipantMsg msg) {
            if (msg.networkId == 0) {
                Console.WriteLine($"{this.name} received New Client -> {sender.networkId}");
                this.Send(sender, new NetworkIdMsg(sender.networkId));
            }
        }

        protected override void Process(RemoteParticipant sender, NetworkIdMsg msg) { }

        protected override void Process(RemoteParticipant sender, ThingMsg msg) {
            //Console.WriteLine($"SiteServer: Process thing [{msg.networkId}/{msg.thingId}]");
            Thing thing = sender.Get(msg.networkId, msg.thingId);
            if (thing == null) {
                Thing newThing = null;
                if (thingMsgProcessors.TryGetValue(msg.thingType, out Func<byte, byte, Thing> value)) {
                    if (value != null)
                        newThing = value(msg.networkId, msg.thingId);
                }
                if (newThing == null)
                    newThing = new Thing(sender, msg.networkId, msg.thingId, msg.thingType);
                
                sender.Add(newThing);
            }
        }

    }
}