using System.Reflection;
using System.Text;
using GameNetworkLayer.Shared;
using HarmonyLib;
using Svelto.DataStructures;
using Svelto.DataStructures.Experimental;

namespace CLre_server.API.Tools
{
    public class NetServerListener
    {
        internal static bool isEnabled = false;

        private static FasterDictionary<short, FasterList<NetReceiveMessageCallback>> callbacks = new FasterDictionary<short,FasterList<NetReceiveMessageCallback>>();

        public delegate void NetReceiveMessageCallback(NetworkDispatcherCode code, byte[] data, int playerId);

        public static void Enable()
        {
            isEnabled = true;
        }
        
        public static void Disable()
        {
            isEnabled = false;
        }

        public static void DebugReceiveMessage(NetworkDispatcherCode code, NetReceiveMessageCallback callback)
        {
            short key = (short)code;
            if (callbacks.TryGetValue(key, out FasterList<NetReceiveMessageCallback> handlers))
            {
                handlers.Add(callback);
            }
            else
            {
                FasterList<NetReceiveMessageCallback> newHandlers = new FasterList<NetReceiveMessageCallback>(new [] {callback});
                callbacks.Add(key, newHandlers);
            }
        }

        internal static bool RunDebugCallbacks(NetworkDispatcherCode code, byte[] data, int playerId)
        {
            short key = (short)code;
            if (callbacks.TryGetValue(key, out FasterList<NetReceiveMessageCallback> handlers))
            {
                foreach (NetReceiveMessageCallback callback in handlers)
                {
                    callback(code, data, playerId);
                }

                return true;
            }
            else
            {
                return false;
            }
        }

        public static void Log(NetworkDispatcherCode code, byte[] data, int playerId)
        {
            StringBuilder sb = new StringBuilder("Received ");
            sb.Append(code.ToString());
            sb.Append(" for player #");
            sb.Append(playerId);
            sb.Append(": 0x");
            foreach (byte b in data)
            {
                sb.Append(b.ToString("X"));
            }
            Utility.Logging.Log(sb.ToString());
        }
    }

    [HarmonyPatch]
    class NetMessageClientListener_HandleAllMessages_Patch
    {
        [HarmonyPrefix]
        public static void BeforeMethodCall(object ____deserializer, int playerId, object value)
        {
            if (!NetServerListener.isEnabled) return;
            // TODO optimize this to not use Traverse
            Traverse result = Traverse.Create(____deserializer).Method("Deserialize", value);
            NetworkDispatcherCode code = result.Field<NetworkDispatcherCode>("dispatcherCode").Value;
            byte[] data = result.Field<byte[]>("bytes").Value;
            if (data == null)
            {
                Utility.Logging.LogWarning("Network message data was deserialized as null");
                return;
            }
            bool isHandled = NetServerListener.RunDebugCallbacks(code, data, playerId);
            if (!isHandled) Utility.Logging.Log($"Received network message for player {playerId} (code: {code.ToString()}, len: {data.Length})");
        }
        
        [HarmonyTargetMethod]
        public static MethodBase Target()
        {
            return AccessTools.Method("GameNetworkLayer.Server.NetMessageServerListener:HandleAllMessages");
        }
    }
}