using Cyber.Networking.Messages;
using UnityEngine;
using UnityEngine.Networking;

namespace Cyber.Networking.Clientside {

    /// <summary>
    /// Client-class used to connecting to a server and communicating to it.
    /// Also handles all events incoming from the server and forwards them where they should be handled.
    /// </summary>
    public class Client : MonoBehaviour {

        private NetworkClient NetClient;
        private bool Running = false;

        private static Client Singleton;

        /// <summary>
        /// Creates the client and sets it as the signleton.
        /// </summary>
        public Client() {
            Singleton = this;
        }

        // Static interface for usage outside of Client

        /// <summary>
        /// Will launch the client and attempt to connect to the server.
        /// Returns false if client is already running, otherwise true.
        /// 
        /// Generally instead of this you should use <see cref="NetworkEstablisher.StartClient(string, int)"/>
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="port"></param>
        /// <returns>Weather the launch was successful or not.</returns>
        public static bool Launch(string ip, int port) {
            return Singleton.LaunchClient(ip, port);
        }

        /// <summary>
        /// Send messages to the server if the connection is active.
        /// If client is not active, this will return false, otherwise true.
        /// </summary>
        /// <param name="msgType"></param>
        /// <param name="message"></param>
        /// <returns>Weather the send was successful or not.</returns>
        public static bool Send(short msgType, MessageBase message) {
            if (Singleton.Running) {
                Singleton.NetClient.Send(msgType, message);
                return true;
            }
            else {
                return false;
            }
        }

        /// <summary>
        /// Returns if the client is running or not. 
        /// This is independant weather the client is connected or not.
        /// </summary>
        /// <returns>Weather the client is running or not</returns>
        public static bool IsRunning() {
            return Singleton.Running;
        }

        /// <summary>
        /// Returns if the client is connected or not.
        /// </summary>
        /// <returns>Weather the client is connected or not.</returns>
        public static bool IsConnected() {
            return Singleton.NetClient.isConnected;
        }

        private bool LaunchClient(string ip, int port) {
            if (Running) {
                return false;
            }

            ConnectionConfig Config = new ConnectionConfig();
            Config.AddChannel(QosType.ReliableSequenced);
            Config.AddChannel(QosType.UnreliableSequenced);
            NetworkServer.Configure(Config, 10);

            NetClient = new NetworkClient();
            NetClient.Configure(Config, 10);

            Running = true;

            NetClient.RegisterHandler(PktType.TextMessage, HandlePacket);

            NetClient.RegisterHandler(MsgType.Connect, OnConnected);
            NetClient.RegisterHandler(MsgType.Disconnect, OnDisconnected);
            NetClient.RegisterHandler(MsgType.Error, OnError);

            NetClient.Connect(ip, port);

            Debug.Log("Client launched!");
            Term.Println("Client launched!");

            return true;
        }

        private void HandlePacket(NetworkMessage msg) {
            switch (msg.msgType) {
                case (PktType.TextMessage):
                    TextMessage TextMsg = new TextMessage();
                    TextMsg.Deserialize(msg.reader);
                    Term.Println(TextMsg.Message);
                    break;
                default:
                    Debug.LogError("Received an unknown packet, id: " + msg.msgType);
                    Term.Println("Received an unknown packet, id: " + msg.msgType);
                    break;
            }
        }

        // Built-in handles for some events

        private void OnConnected(NetworkMessage msg) {
            Debug.Log("Connected!");
            Term.Println("Connected!");

            Term.AddCommand("send (message)", "Send a message across the vastness of space and time!", (args) => {
                Term.Println("You: " + args[0]);
                NetClient.Send(PktType.TextMessage, new TextMessage("A Client: " + args[0]));
            });
        }

        private void OnDisconnected(NetworkMessage msg) {
            Debug.Log("Disconnected!");
            Term.Println("Disconnected!");
            Running = false;
        }

        private void OnError(NetworkMessage msg) {
            Debug.LogError("Encountered a network error. Shutting down.");
            Term.Println("Encountered a network error. Shutting down.");
            NetClient.Disconnect();
            Running = false;
        }
    }
}