using System;
using System.Collections.Generic;

namespace Passer.RoboidControl {

    /// <summary>
    /// A reference to a participant, possible on a remote location
    /// </summary>
    public class RemoteParticipant {
        /// <summary>
        /// The internet address of the participant
        /// </summary>
        public string ipAddress = "0.0.0.0";
        /// <summary>
        /// The UDP port on which the participant can be reached
        /// </summary>
        public int port = 0;

        /// <summary>
        /// The network ID of the participant
        /// </summary>
        public byte networkId;

        /// <summary>
        /// Default constructor
        /// </summary>
        public RemoteParticipant() {}
        /// <summary>
        /// Create a new remote participant
        /// </summary>
        /// <param name="ipAddress">The ip address of the participant</param>
        /// <param name="port">The UDP port of the participant</param>
        public RemoteParticipant(string ipAddress, int port) {
            this.ipAddress = ipAddress;
            this.port = port;
        }

        /// <summary>
        /// The things reported by this participant
        /// </summary>
        protected readonly List<Thing> things = new List<Thing>();

        /// <summary>
        /// Get a thing with the given ids
        /// </summary>
        /// <param name="networkId">The networkId of the thing</param>
        /// <param name="thingId">The ID of the thing</param>
        /// <returns>The thing when it is found, null in other cases.</returns>
        public Thing Get(byte networkId, byte thingId) {
            Thing thing = things.Find(aThing => Thing.IsThing(aThing, networkId, thingId));
            // if (thing == null)
            //     Console.WriteLine($"Could not find thing {ipAddress}:{port}[{networkId}/{thingId}]");
            return thing;
        }

        /// <summary>
        /// Add a new thing for this participant
        /// </summary>
        /// <param name="thing">The thing to add</param>
        /// <param name="invokeEvent">Invoke an notification event when the thing has been added</param>
        public void Add(Thing thing, bool invokeEvent = true) {
            // Console.WriteLine($"added thing [{thing.networkId}/{thing.id}]"); 
            Thing foundThing = Get(thing.networkId, thing.id);

            if (foundThing == null) {
                things.Add(thing);

                if (invokeEvent)
                    Thing.InvokeNewThing(thing);
                // Console.Write($"Add thing {ipAddress}:{port}[{networkId}/{thing.id}]");
            } else {
                if (thing != foundThing) {
                    // should be: find first non-existing id...
                    thing.id = (byte)this.things.Count;
                    things.Add(thing);
                    // Console.Write($"Add thing, updated thing id to [{thing.networkId}/{thing.id}]");
                }
            }
        }

    }

}