using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

namespace Multiplayer
{

    public class ClientManager : MonoBehaviour
    {

        #region Inspector Variables
        [Header("Client Settings")]
        [Tooltip("Address server is hosted on")]
        [SerializeField]
        private string ServerAddress = "127.0.0.1";
        [Tooltip("Port to connect to server on")]
        [SerializeField]
        private int Port = 4444;
        [Tooltip("Connects client to server on awake")]
        [SerializeField]
        private bool ConnectOnStart = false;

        public string Name;
        #endregion

        //Returns if client is current connected to a server
        public bool IsConnected { get; private set; }
        public byte ID { get; private set; }

        //UNET client class which connects to the server;
        private NetworkClient uNetClient;

        /// <summary>
        /// Call to connect client to host
        /// </summary>
        [ContextMenu("Start Client")]
        public void StartClient()
        {
            StartClient(ServerAddress, Port);
        }

        /// <summary>
        /// Call to connect the client to the host
        /// </summary>
        /// <param name="ServerAddress">Server Address to connect to</param>
        /// <param name="Port">Port to connect on</param>
        public void StartClient(string ServerAddress, int Port)
        {
            //If client is already connected to don't continue
            if (IsConnected)
            {
                Debug.Log("Client already connected to a server. Client needs to disconnect before it can connect to a server");
                return;
            }

            Debug.Log("Attempting to connect to: '" + ServerAddress + "' on port : '" + Port + "'");

            uNetClient = new NetworkClient();
            RegisterHandlers(uNetClient);

            uNetClient.Configure(ChannelConfig.DefaultTopology());
            uNetClient.Connect(ServerAddress, Port);
        }

        /// <summary>
        /// Helper function which sets up all necessary handlers for message types
        /// </summary>
        /// <param name="client"></param>
        private void RegisterHandlers(NetworkClient client)
        {
            client.RegisterHandler(MsgType.Connect, OnConnected);
            client.RegisterHandler(MsgType.Disconnect, OnDisconnected);
            client.RegisterHandler(LoginMsgID.QueryName, OnRecieveID);
        }


        private void OnConnected(NetworkMessage msg)
        {
            IsConnected = true;
            ID = (byte)msg.conn.connectionId;
            Debug.Log("Successfully connected to server");   
        }

        private void OnDisconnected(NetworkMessage msg)
        {
            IsConnected = false;
            Debug.Log("Disconnected from Server");
        }

        private void OnRecieveID(NetworkMessage msg)
        {
            PlayerMsg playerMsg;
            if (!Utility.ReadMessage<PlayerMsg>(msg, out playerMsg))
                return;

            Debug.Log("Recieved ID from server: " + playerMsg.ID);

            ID = playerMsg.ID;
            SendMessage(LoginMsgID.Name, new StringMsg(ID, Name));
        }


        /// <summary>
        /// Sends message to server
        /// </summary>
        /// <param name="msgType">Message type, used to determin message handler</param>
        /// <param name="msg">The message to send</param>
        /// <param name="channel">Which channel to send on, by deafult sends on Reliable</param>
        /// <param name="BackLog">If client isn't connected to server add to BackLog, by default true</param>
        public void SendMessage(short msgType, MessageBase msg, ServerChannel channel = ServerChannel.Reliable)
        {
            //if client isn't connected add to backlog
            if (IsConnected)
            {
                Debug.Log("Player not connected to server");
            }

            uNetClient.SendByChannel(msgType, msg, (int)channel);
        }
    }
}